https://index.zshipu.com/geek/tags/clazz/ Recent content in Clazz on 知识铺的博客 Hugo -- gohugo.io zh-CN Wed, 06 Mar 2024 13:23:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Printer/ Wed, 06 Mar 2024 13:23:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Printer/ Spring Printer 类全路径: org.springframework.format.Printer 类作用: 对象转换成字符串 1 2 3 4 5 6 7 8 9 10 11 12 13 @FunctionalInterface public interface Printer<T> { /** * Print the object of type T for display. * 打印对象 * @param object the instance to print * @param locale the current user locale * @return the printed text string */ String print(T object, Locale locale); } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Parser/ Wed, 06 Mar 2024 13:22:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Parser/ Spring Parser 类全路径: org.springframework.format.Parser 类作用: 字符串准换成 java 对象 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 @FunctionalInterface public interface Parser<T> { /** * Parse a text String to produce a T. * 将字符串转换成对象 * @param text the text string * @param locale the current user locale * @return an instance of T * @throws ParseException when a parse exception occurs in a java.text parsing library * @throws IllegalArgumentException when a parse exception occurs */ T parse(String text, Locale locale) throws ParseException; } 类图 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Formatter/ Wed, 06 Mar 2024 13:21:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-Formatter/ Spring Formatter 类全路径: org.springframework.format.Formatter 1 2 3 public interface Formatter<T> extends Printer<T>, Parser<T> { } 该接口继承了 printer 和 parser 两个接口. 比较常见的有: DateFormatter 就是继承这个接口. https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-AnnotationFormatterFactory/ Wed, 06 Mar 2024 13:20:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/format/Spring-AnnotationFormatterFactory/ Spring AnnotationFormatterFactory 类全路径: org.springframework.format.AnnotationFormatterFactory 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 public interface AnnotationFormatterFactory<A extends Annotation> { /** * The types of fields that may be annotated with the <A> annotation. * 字段类型 */ Set<Class<?>> getFieldTypes(); /** * Get the Printer to print the value of a field of {@code fieldType} annotated with * {@code annotation}. * <p>If the type T the printer accepts is not assignable to {@code fieldType}, a * coercion from {@code fieldType} to T will be attempted before the Printer is invoked. * 通过注解和字段类型获取输出接口 * @param annotation the https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-scan/ Wed, 06 Mar 2024 13:16:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-scan/ Spring scan Author: HuiFer 源码阅读仓库: SourceHot-Spring 解析 Spring 注解形式使用有下面两种方式 通过AnnotationConfigApplicationContext参数:扫描包 通过 xml 配置context:component-scan属性base-package 1 2 AnnotationConfigApplicationContext aac = new AnnotationConfigApplicationContext("com.huifer.source.spring.ann"); 1 2 <context:component-scan base-package="com.huifer.source.spring.ann"> </context:component-scan> 目标明确开始找入口方法 Annota https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-beanFactory/ Wed, 06 Mar 2024 13:15:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-beanFactory/ Spring BeanFactory Author: HuiFer 源码阅读仓库: SourceHot-spring BeanFactory 概述 org.springframework.beans.factory.BeanFactory 类图 方法列表 贴出部分代码. 仅表示方法作用 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 public interface BeanFactory { // 从容器中根据beanname获取 Object getBean(String name) throws BeansException; // 延迟加载对象 <T> ObjectProvider<T> getBeanProvider(Class<T> requiredType); // 是否存在beanName boolean containsBean(String name); // 这个 beanName 是否是单例的. 映射成 bean boolean isSingleton(String name) throws NoSuchBeanDefinitionException; // 是否多例. boolean isPrototype(String name) throws NoSuchBeanDefinitionException; // 类 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SystemPropertyUtils/ Wed, 06 Mar 2024 13:14:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SystemPropertyUtils/ Spring SystemPropertyUtils spring 中获取系统属性的工具类 内部属性 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 /** * * Prefix for system property placeholders: "${". * 前缀占位符 * */ public static final String PLACEHOLDER_PREFIX = "${"; /** * Suffix for system property placeholders: "}". * 后缀占位符 * */ public static final String PLACEHOLDER_SUFFIX = "}"; /** * Value separator for system property placeholders: ":". * 值分割符号 * */ public static final String VALUE_SEPARATOR = ":"; /** * 占位符解析类 */ private static final PropertyPlaceholderHelper strictHelper = new PropertyPlaceholderHelper(PLACEHOLDER_PREFIX, PLACEHOLDER_SUFFIX, VALUE_SEPARATOR, false); https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-StopWatch/ Wed, 06 Mar 2024 13:13:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-StopWatch/ Spring StopWatch Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径: org.springframework.util.StopWatch 属性 taskList: 任务信息列表 keepTaskList: 是否保留任务信息列表 startTimeMillis: 任务开始的时间 currentTaskName: 任务名称 lastTaskInfo: 任务信息 taskCount: 任务数量 totalTimeMillis: 总共花费的时间 方法 org.springframework.util.StopWatch.start(java.lang.String) 1 2 3 4 5 6 7 public void start(String taskName) throws IllegalStateException { if (this.currentTaskName != null) { throw new IllegalStateException("Can't start StopWatch: it's already running"); } this.currentTaskName = taskName; this.startTimeMillis = System.currentTimeMillis(); } org.springframework.util.StopWatch.stop 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 public void stop() throws IllegalStateException { if (this.currentTaskName == null) { throw new IllegalStateException("Can't stop StopWatch: it's not https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SpringFactoriesLoader/ Wed, 06 Mar 2024 13:12:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SpringFactoriesLoader/ SpringFactoriesLoader Author: HuiFer 源码阅读仓库: SourceHot-spring-boot 全路径 : org.springframework.core.io.support.SpringFactoriesLoader 测试类 : org.springframework.core.io.support.SpringFactoriesLoaderTests loadFactories 加载并实例化工厂 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public static <T> List<T> loadFactories(Class<T> factoryType, @Nullable ClassLoader classLoader) { Assert.notNull(factoryType, "'factoryType' must not be null"); ClassLoader classLoaderToUse = classLoader; if (classLoaderToUse == null) { classLoaderToUse = SpringFactoriesLoader.class.getClassLoader(); } // 工厂实现类名称 List<String> factoryImplementationNames = loadFactoryNames(factoryType, classLoaderToUse); if (logger.isTraceEnabled()) { logger.trace("Loaded [" + factoryType.getName() + "] names: " + factoryImplementationNames); } List<T> result = new ArrayList<>(factoryImplementationNames.size()); for (String factoryImplementationName : factoryImplementationNames) { // 将实例化的工厂放入结果集合 result.add(instantiateFactory(factoryImplementationName, factoryType, classLoaderToUse)); } // 排序 AnnotationAwareOrderComparator.sort(result); return https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SimpleAliasRegistry/ Wed, 06 Mar 2024 13:11:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-SimpleAliasRegistry/ Spring-SimpleAliasRegistry Author: HuiFer 源码阅读仓库: huifer-spring AliasRegistry SimpleAliasRegistry继承org.springframework.core.AliasRegistry 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 public interface AliasRegistry { /** * Given a name, register an alias for it. * 别名注册 * * @param name the canonical https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Scheduling/ Wed, 06 Mar 2024 13:10:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Scheduling/ Spring 定时任务 Author: HuiFer 源码阅读仓库: SourceHot-spring EnableScheduling 首先关注的类为启动定时任务的注解@EnableScheduling 1 2 3 4 5 6 7 @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Import(SchedulingConfiguration.class) @Documented public @interface EnableScheduling { } SchedulingConfiguration 注册定时任务相关信息 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 @Configuration @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public class SchedulingConfiguration { /** * 开启定时任务 * @return */ @Bean(name = TaskManagementConfigUtils.SCHEDULED_ANNOTATION_PROCESSOR_BEAN_NAME) @Role(BeanDefinition.ROLE_INFRASTRUCTURE) public ScheduledAnnotationBeanPostProcessor scheduledAnnotationProcessor() { // 注册 ScheduledAnnotationBeanPostProcessor return new ScheduledAnnotationBeanPostProcessor(); } } ScheduledAnnotationBeanPostProcessor 关注 application 事件,以及 spring 生命周期 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-PropertySources/ Wed, 06 Mar 2024 13:09:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-PropertySources/ Spring PropertySources Author: HuiFer 源码阅读仓库: SourceHot-spring MutablePropertySources 全路径: org.springframework.core.env.MutablePropertySources MutablePropertySources类内部存储了List<PropertySource<?>>对象,主要是针对List<PropertySource<?>> 进行的操作.换句话说就是对 list 操作 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-PropertyPlaceholderHelper/ Wed, 06 Mar 2024 13:08:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-PropertyPlaceholderHelper/ Spring PropertyPlaceholderHelper 类全路径: org.springframework.util.PropertyPlaceholderHelper parseStringValue org.springframework.util.PropertyPlaceholderHelper#parseStringValue 这个方法是主要方法 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 protected String parseStringValue( String value, PlaceholderResolver placeholderResolver, @Nullable Set<String> visitedPlaceholders) { // 占位符所在位置 int startIndex = value.indexOf(this.placeholderPrefix); if (startIndex == -1) { return value; } // 返回值 StringBuilder result = new StringBuilder(value); while (startIndex != -1) { // 寻找结尾占位符 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Property/ Wed, 06 Mar 2024 13:07:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Property/ Spring Property Author: HuiFer 源码阅读仓库: SourceHot-spring 相关类 org.springframework.beans.PropertyValues org.springframework.beans.PropertyValue org.springframework.beans.MutablePropertyValues 类图如下 在 Spring IoC 中,非 Web 工程,使用 xml 或者注解进行配置主要使用到的是 PropertyValues ，PropertyValue ，MutablePropertyValues 三个 其中 PropertyValues 是继承迭代器，具体实现在MutablePropertyValues 他们处理的对象是Propert https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-OrderUtils/ Wed, 06 Mar 2024 13:06:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-OrderUtils/ Spring OrderUtils Author: HuiFer 源码阅读仓库: SourceHot-Spring org.springframework.core.annotation.OrderUtils主要方法如下 getOrder getPriority 测试类org.springframework.core.annotation.OrderUtilsTests 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-OrderComparator/ Wed, 06 Mar 2024 13:05:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-OrderComparator/ Spring OrderComparator Author: HuiFer 源码阅读仓库: SourceHot-Spring 1 2 3 4 5 6 7 8 9 10 11 12 13 14 private int doCompare(@Nullable Object o1, @Nullable Object o2, @Nullable OrderSourceProvider sourceProvider) { boolean p1 = (o1 instanceof PriorityOrdered); boolean p2 = (o2 instanceof PriorityOrdered); if (p1 && !p2) { return -1; } else if (p2 && !p1) { return 1; } int i1 = getOrder(o1, sourceProvider); int i2 = getOrder(o2, sourceProvider); // 对比两个Order值得大小返回 return Integer.compare(i1, i2); } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 private int getOrder(@Nullable Object obj, @Nullable OrderSourceProvider sourceProvider) { Integer order = null; if (obj != null && sourceProvider https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MultiValueMap/ Wed, 06 Mar 2024 13:04:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MultiValueMap/ Spring MultiValueMap Author: HuiFer 源码阅读仓库: SourceHot-spring 类路径: org.springframework.util.MultiValueMap 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 public interface MultiValueMap<K, V> extends Map<K, List<V>> { /** * 获取value的第一 */ @Nullable V getFirst(K key); /** * 添加元素 */ void add(K key, @Nullable V value); /** * 添加所有元素 */ void addAll(K key, List<? extends V> values); /** * 添加要给 {@link MultiValueMap} 对象 */ void addAll(MultiValueMap<K, V> values); default void addIfAbsent(K key, @Nullable V value) { https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MethodOverride/ Wed, 06 Mar 2024 13:03:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MethodOverride/ Spring MethodOverride Author: HuiFer 源码阅读仓库: SourceHot-spring org.springframework.beans.factory.support.MethodOverride org.springframework.beans.factory.support.LookupOverride org.springframework.beans.factory.support.ReplaceOverride org.springframework.beans.factory.support.MethodOverrides MethodOverride MethodOverride 方法重载类 在MethodOverride定义了下面三个属性 方法名称 是否重载 源 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 public abstract class MethodOverride implements BeanMetadataElement { /** * 方法名称 */ private final String methodName; /** * 是否重载 */ private boolean overloaded = true; /** * 源 */ @Nullable private Object source; } 定义了一个抽象方法, 交由子类实现 1 public abstract boolean matches(Method method); 类图 在 Spring 中 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Metadata/ Wed, 06 Mar 2024 13:02:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Metadata/ Spring 元信息 Author: HuiFer 源码阅读仓库: SourceHot-Spring ClassMetadata 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 public interface ClassMetadata { /** * 类名 */ String getClassName(); /** * 是否是接口 */ boolean isInterface(); /** * 是否是注解 */ boolean isAnnotation(); /** * 是否是超类 */ boolean isAbstract(); /** * 是否允许创 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MessageSource/ Wed, 06 Mar 2024 13:01:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-MessageSource/ Spring MessageSource Author: HuiFer 源码阅读仓库: SourceHot-Spring 初始化入口 org.springframework.context.support.AbstractApplicationContext.refresh方法有initMessageSource()方法进行了MessageSource初始化 1 2 3 4 5 6 7 8 9 10 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Import/ Wed, 06 Mar 2024 13:00:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Import/ Spring Import Author: HuiFer 源码阅读仓库: SourceHot-spring 分析 org.springframework.context.annotation.Import 1 2 3 4 5 6 7 8 9 10 11 12 13 @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface Import { /** * {@link Configuration @Configuration}, {@link ImportSelector}, * {@link ImportBeanDefinitionRegistrar}, or regular component classes to import. * * 需要导入的类 */ Class<?>[] value(); } ImportBeanDefinitionRegistrar 注册 Import Bean org.springframework.context.annotation.ImportBeanDefinitionRegistrar 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 public interface ImportBeanDefinitionRegistrar { /** * Register bean definitions as necessary based on the given annotation metadata of * the importing {@code @Configuration} class. * <p>Note that {@link BeanDefinitionRegistryPostProcessor} types may <em>not</em> be * registered here, due to lifecycle constraints related to {@code @Configuration} * class processing. * * 对impor https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-EntityResolver/ Wed, 06 Mar 2024 12:59:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-EntityResolver/ EntityResolver Author: HuiFer 源码阅读仓库: huifer-spring 源码路径: org.xml.sax.EntityResolver,非 Spring 类 DelegatingEntityResolver#resolveEntity org.springframework.beans.factory.xml.DelegatingEntityResolver.resolveEntity 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 @Override @Nullable public InputSource resolveEntity(@Nullable String publicId, @Nullable String systemId) throws SAXException, IOException { if (systemId != null) { if (systemId.endsWith(DTD_SUFFIX)) { return this.dtdResolver.resolveEntity(publicId, systemId); } else if (systemId.endsWith(XSD_SUFFIX)) { return this.schemaResolver.resolveEntity(publicId, systemId); } } // Fall back to the parser's default behavior. return null; } 上述这段代码是针对 xml 进行校验 1 2 3 <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 如上所示以.x https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-DefaultSingletonBeanRegistry/ Wed, 06 Mar 2024 12:58:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-DefaultSingletonBeanRegistry/ DefaultSingletonBeanRegistry Author: HuiFer 源码阅读仓库: SourceHot-Spring 源码路径: org.springframework.beans.factory.support.DefaultSingletonBeanRegistry 官方提供的测试类: org.springframework.beans.factory.support.DefaultSingletonBeanRegistryTests 类图 注册方法解析 从名字可以看出这是一个单例对象的注册类 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.registerSingleton 测试用例出发 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 @Test public void testSingletons() { DefaultSingletonBeanRegistry beanRegistry = new DefaultSingletonBeanRegistry(); TestBean tb = new TestBean(); beanRegistry.registerSingleton("tb", tb); assertSame(tb, beanRegistry.getSingleton("tb")); TestBean tb2 = (TestBean) beanRegistry.getSingleton("tb2", new ObjectFactory<Object>() { @Override public Object getObject() throws BeansException { return new TestBean(); } }); assertSame(tb2, beanRegistry.getSingleton("tb2")); assertSame(tb, beanRegistry.getSingleton("tb")); assertSame(tb2, beanRegistry.getSingleton("tb2")); assertEquals(2, beanRegistry.getSingletonCount()); String[] names = beanRegistry.getSingletonNames(); https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Custom-label-resolution/ Wed, 06 Mar 2024 12:57:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Custom-label-resolution/ Spring 自定义标签解析 Author: HuiFer 源码阅读仓库: SourceHot-Spring 与自定义标签解析相关的类 org.springframework.beans.factory.xml.AbstractSingleBeanDefinitionParser org.springframework.beans.factory.xml.NamespaceHandlerSupport 开始源码之前先搭建一个环境 环境搭建 创建对象 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public class UserXtd { private String userName; private String emailAddress; public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getEmailAddress() { return emailAddress; } public void setEmailAddress(String emailAddress) { this.emailAddress = emailAddress; } } 创建 xsd 文件 1 2 3 4 5 6 7 8 9 10 11 12 13 <?xml version="1.0" encoding="UTF-8" ?> <schema xmlns="http://www.w3.org/2001/XMLSchema" https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Custom-attribute-resolver/ Wed, 06 Mar 2024 12:56:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Custom-attribute-resolver/ Spring 自定义属性解析器 Author: HuiFer 源码阅读仓库: SourceHot-Spring 用例 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer"> <property name="propertyEditorRegistrars"> <list> <bean class="com.huifer.source.spring.bean.DatePropertyRegister"/> </list> </property> <property name="customEditors"> <map> <entry key="java.util.Date" value="com.huifer.source.spring.bean.DatePropertyEditor"> </entry> </map> </property> </bean> <bean id="apple" class="com.huifer.source.spring.bean.Apple"> <property name="date" value="2020-01-01 01:01:01"/> </bean> </beans> 1 2 3 4 5 6 7 8 public class DatePropertyRegister implements PropertyEditorRegistrar { @Override public void registerCustomEditors(PropertyEditorRegistry registry) { registry.registerCustomEditor(Date.class, new CustomDateEditor( new SimpleDateFormat("yyyy-MM-dd"), true) ); } } 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 public class DatePropertyEditor extends PropertyEditorSupport { https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Conditional/ Wed, 06 Mar 2024 12:55:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-Conditional/ Spring Conditional Author: HuiFer 源码阅读仓库: SourceHot-spring Conditional 1 2 3 4 5 6 7 8 9 10 11 @Target({ ElementType.TYPE, ElementType.METHOD }) @Retention(RetentionPolicy.RUNTIME) @Documented public @interface Conditional { /** * 多个匹配器接口 */ Class<? extends Condition>[] value(); } Condition @FunctionalInterface public interface Condition { /** * 匹配,如果匹配返回true进行初始化,返回false跳过初始化 */ boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata); } ConditionContext 上下文 AnnotatedTypeMetadata 注解信息 ConditionContext public interface ConditionContext { /** * bean的定义 */ BeanDefinitionRegistry getRegistry(); /** * bean 工厂 */ @Nullable ConfigurableListableBeanFactory getBeanFactory(); /** * 环境 */ Environment getEnvironment(); /** * 资 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanNameGenerator/ Wed, 06 Mar 2024 12:54:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanNameGenerator/ Spring BeanNameGenerator Author: HuiFer 源码阅读仓库: SourceHot-spring org.springframework.beans.factory.support.BeanNameGenerator 方法用来生成 beanName 1 2 3 4 5 6 7 8 9 10 11 12 13 public interface BeanNameGenerator { /** * Generate a bean name for the given bean definition. * 生成 beanName * @param definition the bean definition to generate a name for * @param registry the bean definition registry that the given definition * is supposed to be registered with * @return the generated bean name */ String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry); } DefaultBeanNameGenerator org.springframework.beans.factory.support.DefaultBeanNameGenerator 调用工具类方法进行生成 1 2 3 4 @Override public String generateBeanName(BeanDefinition definition, BeanDefinitionRegistry registry) { return BeanDefinitionReaderUtils.generateBeanName(definition, registry); } ClassName + # + 十六进制字符 parentName + $child + # + 十 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanFactoryPostProcessor/ Wed, 06 Mar 2024 12:53:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanFactoryPostProcessor/ Spring BeanFactoryPostProcessor Author: HuiFer 源码阅读仓库: SourceHot-Spring 作用: 定制或修改BeanDefinition的属性 Demo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 public class ChangeAttrBeanPostProcessor implements BeanFactoryPostProcessor { private Set<String> attr; public ChangeAttrBeanPostProcessor() { attr = new HashSet<>(); } public Set<String> getAttr() { return attr; } public void setAttr(Set<String> attr) { this.attr = attr; } @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { String[] beanDefinitionNames = beanFactory.getBeanDefinitionNames(); for (String beanName : beanDefinitionNames) { BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanName); StringValueResolver stringValueResolver = new StringValueResolver() { @Override public String resolveStringValue(String https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanDefinitionReaderUtils/ Wed, 06 Mar 2024 12:52:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanDefinitionReaderUtils/ Spring BeanDefinitionReaderUtils Author: HuiFer 源码阅读仓库: SourceHot-spring createBeanDefinition org.springframework.beans.factory.support.BeanDefinitionReaderUtils.createBeanDefinition 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 public static AbstractBeanDefinition createBeanDefinition( @Nullable String parentName, @Nullable String className, @Nullable ClassLoader classLoader) throws ClassNotFoundException { GenericBeanDefinition bd = new GenericBeanDefinition(); // 设置 父bean bd.setParentName(parentName); if (className != null) { if (classLoader != null) { // 设置 class // 内部是通过反射创建 class bd.setBeanClass(ClassUtils.forName(className, classLoader)); } else { // 设置 class name bd.setBeanClassName(className); } } return bd; } generateBeanName org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generateBeanName(org.springframework.beans.factory.config.BeanDefinition, org.springframework.beans.factory.support.BeanDefinitionRegistry, boolean) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanDefinitionParserDelegate/ Wed, 06 Mar 2024 12:51:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-BeanDefinitionParserDelegate/ Spring BeanDefinitionParserDelegate Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径org.springframework.beans.factory.xml.BeanDefinitionParserDelegate 解析 xml 中标签的委托类 在这个类中定义常量如下，为后续解析提供帮助 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-ApplicationListener/ Wed, 06 Mar 2024 12:50:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-ApplicationListener/ Spring initApplicationEventMulticaster Author: HuiFer 源码阅读仓库: SourceHot-Spring demo 1 2 3 4 5 6 7 8 9 10 11 package com.huifer.source.spring.applicationListener; import org.springframework.context.ApplicationEvent; import org.springframework.context.ApplicationListener; public class DemoApplicationListener implements ApplicationListener { @Override public void onApplicationEvent(ApplicationEvent event) { System.out.println("com.huifer.source.spring.applicationListener.DemoApplicationListener.onApplicationEvent"); } } 1 2 3 4 5 6 7 <?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <bean id="demoApplicationListener" class="com.huifer.source.spring.applicationListener.DemoApplicationListener"/> </beans> 1 2 3 4 5 public class ListenerSourceCode { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("Listener-demo.xml"); } } 初始化入口 org.springframework.context.support.AbstractAppli https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-AnnotationUtils/ Wed, 06 Mar 2024 12:49:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/Spring-AnnotationUtils/ Spring AnnotationUtils Author: HuiFer 源码阅读仓库: SourceHot-Spring org.springframework.core.annotation.AnnotationUtils提供了注解相关的方法 getAnnotation: 获取注解 findAnnotation: 寻找注解 getValue: 获取属性值 getDefaultValue: 获取默认值 getAnnotation 测试用例如下 1 2 3 4 5 6 7 @Test public void findMethodAnnotationOnLeaf() throws Exception { Method m = Leaf.class.getMethod("annotatedOnLeaf"); assertNotNull(m.getAnnotation(Order.class)); assertNotNull(getAnnotation(m, Order.class)); assertNotNull(findAnnotation(m, Order.class)); } org.springframework.core.annotation.AnnotationUtils.getAnnotation(java.lang.reflect.Method, java.lang.Class<A>) 1 2 3 4 5 6 7 8 9 10 11 12 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-StubPropertySource/ Wed, 06 Mar 2024 12:48:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-StubPropertySource/ Spring StubPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 整体代码如下. 通过 StubPropertySource 的 getProperty 方法永远返回 null 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 public static class StubPropertySource extends PropertySource<Object> { public StubPropertySource(String name) { super(name, new Object()); } /** * Always returns {@code null}. */ @Override @Nullable public String getProperty(String name) { return null; } } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-SimpleCommandLinePropertySource/ Wed, 06 Mar 2024 12:47:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-SimpleCommandLinePropertySource/ Spring SimpleCommandLinePropertySource 全路径: org.springframework.core.env.SimpleCommandLinePropertySource 1 public class SimpleCommandLinePropertySource extends CommandLinePropertySource<CommandLineArgs> {} SimpleCommandLinePropertySource 的 source 类型是 CommandLineArgs 具体解释请看下面分析 CommandLineArgs 两个内部属性 1 2 3 4 5 6 7 8 9 10 11 12 class CommandLineArgs { /** * 选项参数列表 */ private final Map<String, List<String>> optionArgs = new HashMap<>(); /** * 非选项参数列表 */ private final List<String> nonOptionArgs = new ArrayList<>(); } addOptionArg 添加 选项参数 1 2 3 4 5 6 7 8 public void addOptionArg(String optionName, @Nullable String optionValue) { if (!this.optionArgs.containsKey(optionName)) { this.optionArgs.put(optionName, new ArrayList<>()); } if (optionValue != null) { this.optionArgs.get(optionName).add(optionValue); } } getOptionNames 获取选项参数列表 1 2 3 public Set<String> https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-SimpleCommandLineArgsParser/ Wed, 06 Mar 2024 12:46:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-SimpleCommandLineArgsParser/ Spring SimpleCommandLineArgsParser Author: HuiFer 源码阅读仓库: SourceHot-spring 类全路径: `org.springframework.core.env.SimpleCommandLineArgsParser 类作用: 将命令行参数解析成 org.springframework.core.env.CommandLineArgs 完整代码如下. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 class SimpleCommandLineArgsParser { /** * Parse the given {@code String} array based on the rules described {@linkplain * SimpleCommandLineArgsParser above}, returning a fully-populated * {@link CommandLineArgs} object. * @param args command line arguments, typically from a {@code main()} method */ public CommandLineArgs parse(String... args) { CommandLineArgs commandLineArgs = new CommandLineArgs(); for (String arg : args) { if (arg.startsWith("--")) { String optionText = arg.substring(2, arg.length()); String https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ServletContextPropertySource/ Wed, 06 Mar 2024 12:45:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ServletContextPropertySource/ Spring ServletContextPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 类全路径: org.springframework.web.context.support.ServletContextPropertySource 内部数据结构是 ServletContext 接口 整体代码如下. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 public class ServletContextPropertySource extends EnumerablePropertySource<ServletContext> { public ServletContextPropertySource(String name, ServletContext servletContext) { super(name, servletContext); } @Override public String[] getPropertyNames() { // javax.servlet.ServletContext.getInitParameterNames 方法调用 return StringUtils.toStringArray(this.source.getInitParameterNames()); } @Override @Nullable public String getProperty(String name) { // javax.servlet.ServletContext.getInitParameter return this.source.getInitParameter(name); } } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ServletConfigPropertySource/ Wed, 06 Mar 2024 12:44:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ServletConfigPropertySource/ Spring ServletConfigPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 类全路径: org.springframework.web.context.support.ServletConfigPropertySource 内部数据结构是 ServletConfig 整体代码如下 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 public class ServletConfigPropertySource extends EnumerablePropertySource<ServletConfig> { public ServletConfigPropertySource(String name, ServletConfig servletConfig) { super(name, servletConfig); } @Override public String[] getPropertyNames() { // javax.servlet.ServletConfig.getInitParameterNames return StringUtils.toStringArray(this.source.getInitParameterNames()); } @Override @Nullable public String getProperty(String name) { // javax.servlet.ServletConfig.getInitParameter return this.source.getInitParameter(name); } } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ResourcePropertySource/ Wed, 06 Mar 2024 12:43:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ResourcePropertySource/ Spring ResourcePropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径: org.springframework.core.io.support.ResourcePropertySource source 依然是 map 结构 getNameForResource 1 2 3 4 5 6 7 8 9 private static String getNameForResource(Resource resource) { // 获取 resource 的介绍 String name = resource.getDescription(); if (!StringUtils.hasText(name)) { // 短类名+@+hashcode name = resource.getClass().getSimpleName() + "@" + System.identityHashCode(resource); } return name; } withName 创建 ResourcePropertySource 对象, 根据 name 属性 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 public ResourcePropertySource withName(String name) { if (this.name.equals(name)) { return this; } // Store the original resource name if necessary... if (this.resourceName != null) { if (this.resourceName.equals(name)) { return new ResourcePropertySource(this.resourceName, https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-PropertiesPropertySource/ Wed, 06 Mar 2024 12:42:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-PropertiesPropertySource/ Spring PropertiesPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径: org.springframework.core.env.PropertiesPropertySource Properties 是 map 结构。可以做类型转换. getPropertyNames 就转换成了父类 MapPropertySource 的方法了 map.keySet() 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 public class PropertiesPropertySource extends MapPropertySource { @SuppressWarnings({"rawtypes", "unchecked"}) public PropertiesPropertySource(String name, Properties source) { super(name, (Map) source); } protected PropertiesPropertySource(String name, Map<String, Object> source) { super(name, source); } @Override public String[] getPropertyNames() { synchronized (this.source) { return super.getPropertyNames(); } } } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-MockPropertySource/ Wed, 06 Mar 2024 12:41:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-MockPropertySource/ Spring MockPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 内部 source 是 Properties 类型 withProperty 设置属性名称和属性值 1 2 3 4 public MockPropertySource withProperty(String name, Object value) { this.setProperty(name, value); return this; } setProperty 1 2 3 public void setProperty(String name, Object value) { this.source.put(name, value); } 完整代码 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 public class MockPropertySource extends PropertiesPropertySource { /** * {@value} is https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-MapPropertySource/ Wed, 06 Mar 2024 12:40:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-MapPropertySource/ Spring MapPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 类全路径: org.springframework.core.env.MapPropertySource 内部数据结构是一个Map<String,Object> 这是一个对 map 的操作. 整体代码如下. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 public class MapPropertySource extends EnumerablePropertySource<Map<String, Object>> { public MapPropertySource(String name, Map<String, Object> source) { super(name, source); } @Override @Nullable public Object getProperty(String name) { // 从map中获取 name 对应的value return this.source.get(name); } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-EnumerablePropertySource/ Wed, 06 Mar 2024 12:39:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-EnumerablePropertySource/ Spring EnumerablePropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径: org.springframework.core.env.EnumerablePropertySource 在这个类中定义了一个抽象方法getPropertyNames 用来获取所有的 property 的名称 1 public abstract String[] getPropertyNames(); 整体代码如下 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 public abstract class EnumerablePropertySource<T> extends PropertySource<T> { public EnumerablePropertySource(String name, T source) { super(name, source); } protected EnumerablePropertySource(String name) { super(name); } /** * Return whether this {@code PropertySource} contains a property with the given name. * <p>This implementation https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-CompositePropertySource/ Wed, 06 Mar 2024 12:38:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-CompositePropertySource/ Spring CompositePropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 全路径: org.springframework.core.env.CompositePropertySource 整体代码如下 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 public class CompositePropertySource extends EnumerablePropertySource<Object> { /** * set 集合 */ private final Set<PropertySource<?>> propertySources = new LinkedHashSet<>(); /** * Create https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ComparisonPropertySource/ Wed, 06 Mar 2024 12:37:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-ComparisonPropertySource/ Spring ComparisonPropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 整体代码如下. 下面几个调用方法会直接抛出异常 getSource containsProperty getProperty 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 static class ComparisonPropertySource extends StubPropertySource { // 异常信息 private static final String USAGE_ERROR = "ComparisonPropertySource instances are for use with collection comparison only"; public ComparisonPropertySource(String name) { super(name); } @Override public Object getSource() { // 抛异常 throw new UnsupportedOperationException(USAGE_ERROR); } @Override public boolean containsProperty(String name) { // 抛异常 throw new UnsupportedOperationException(USAGE_ERROR); } @Override @Nullable public String getProperty(String name) { // 抛异常 throw new UnsupportedOperationException(USAGE_ERROR); } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-CommandLinePropertySource/ Wed, 06 Mar 2024 12:36:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PropertySource/Spring-CommandLinePropertySource/ Spring CommandLinePropertySource Author: HuiFer 源码阅读仓库: SourceHot-spring 类全路径: org.springframework.core.env.CommandLinePropertySource 作用: 用来存储命令行参数 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 public abstract class CommandLinePropertySource<T> extends EnumerablePropertySource<T> { public static final String COMMAND_LINE_PROPERTY_SOURCE_NAME = "commandLineArgs"; public static final String DEFAULT_NON_OPTION_ARGS_PROPERTY_NAME = "nonOptionArgs"; private String nonOptionArgsPropertyName = DEFAULT_NON_OPTION_ARGS_PROPERTY_NAME; public CommandLinePropertySource(T source) { // https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-SystemPropertyPlaceholderResolver/ Wed, 06 Mar 2024 12:35:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-SystemPropertyPlaceholderResolver/ Spring SystemPropertyPlaceholderResolver 类全路径: org.springframework.util.SystemPropertyUtils.SystemPropertyPlaceholderResolver 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 private static class SystemPropertyPlaceholderResolver implements PropertyPlaceholderHelper.PlaceholderResolver { private final String text; public SystemPropertyPlaceholderResolver(String text) { this.text = text; } @Override @Nullable public String resolvePlaceholder(String placeholderName) { try { String propVal = System.getProperty(placeholderName); if (propVal == null) { // Fall back to searching the system environment. // 获取系统属性 propVal = System.getenv(placeholderName); } return propVal; } catch (Throwable ex) { System.err.println("Could not resolve placeholder '" + placeholderName + "' in [" + this.text + "] as system property: " + ex); return null; } } } https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-ServletContextPlaceholderResolver/ Wed, 06 Mar 2024 12:34:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-ServletContextPlaceholderResolver/ Spring ServletContextPlaceholderResolver 类全路径: org.springframework.web.util.ServletContextPropertyUtils.ServletContextPlaceholderResolver 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 private static class ServletContextPlaceholderResolver implements PropertyPlaceholderHelper.PlaceholderResolver { private final String text; private final ServletContext servletContext; public ServletContextPlaceholderResolver(String text, ServletContext servletContext) { this.text = text; this.servletContext = servletContext; } @Override @Nullable public String resolvePlaceholder(String placeholderName) { try { // servlet 上下文获取 String propVal = this.servletContext.getInitParameter(placeholderName); if (propVal == null) { // Fall back to system properties. propVal = System.getProperty(placeholderName); if (propVal == null) { // Fall back to searching the system environment. propVal = System.getenv(placeholderName); } } return propVal; } catch (Throwable ex) { System.err.println("Could not resolve placeholder '" + placeholderName + "' in https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-PropertyPlaceholderConfigurerResolver/ Wed, 06 Mar 2024 12:33:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-PropertyPlaceholderConfigurerResolver/ Spring PropertyPlaceholderConfigurerResolver 类全路径: org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.PropertyPlaceholderConfigurerResolver 这个类是从 Properties 中获取属性 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 private final class PropertyPlaceholderConfigurerResolver implements PlaceholderResolver { private final Properties props; private PropertyPlaceholderConfigurerResolver(Properties props) { this.props = props; } @Override @Nullable public String resolvePlaceholder(String placeholderName) { return PropertyPlaceholderConfigurer.this.resolvePlaceholder(placeholderName, this.props, systemPropertiesMode); } } 详细方法如下 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 @Nullable protected String resolvePlaceholder(String placeholder, Properties props, int systemPropertiesMode) { String propVal = null; if (systemPropertiesMode == SYSTEM_PROPERTIES_MODE_OVERRIDE) { propVal = resolveSystemProperty(placeholder); } if (propVal == null) { propVal = resolvePlaceholder(placeholder, props); } if (propVal == null && systemPropertiesMode == SYSTEM_PROPERTIES_MODE_FALLBACK) { propVal = resolveSystemProperty(placeholder); } return propVal; } 1 2 3 4 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-PlaceholderResolver/ Wed, 06 Mar 2024 12:32:00 +0000 https://index.zshipu.com/geek/post/code/docs/Spring/clazz/PlaceholderResolver/Spring-PlaceholderResolver/ Spring PlaceholderResolver 类全路径: org.springframework.util.PropertyPlaceholderHelper.PlaceholderResolver 类作用将占位符中的内容替换成属性值. 假设现有属性表: user.dir = c:\home 传入参数 user.dir 会获得 c:\home 1 2 3 4 5 6 7 8 9 10 11 12 @FunctionalInterface public interface PlaceholderResolver { /** * Resolve the supplied placeholder name to the replacement value. * @param placeholderName the name of the placeholder to resolve * @return the replacement value, or {@code null} if no replacement is to be made */ @Nullable String resolvePlaceholder(String placeholderName); } 类图如下