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MyBatis 源码深度拆解(二):核心配置加载原理

MyBatis 源码深度拆解(二):核心配置加载原理

面试官:MyBatis 是如何解析 mybatis-config.xml 的?Configuration 对象里到底存了些什么?


一、回顾与开头

第 1 篇我们建立了整体架构图,知道SqlSessionFactoryBuilder会读取配置文件并生成Configuration,今天我们就扎根在这一步。

先看一段最简单的启动代码:

String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);SqlSessionFactory sqlSessionFactory =     new SqlSessionFactoryBuilder().build(inputStream);

这 3 行代码背后,隐藏了 XML 解析、标签处理、注册映射器、构建配置对象等一系列复杂动作。今天我们把它完全拆开。所有源码基于mybatis 3.5.16版本


二、XML 解析的入口:XMLConfigBuilder

SqlSessionFactoryBuilder.build(inputStream) 最终会调用到:

// SqlSessionFactoryBuilderpublic SqlSessionFactory build(InputStream inputStream, String environment, Properties properties) {    XMLConfigBuilder parser = new XMLConfigBuilder(inputStream, environment, properties);    // ⭐ 核心解析方法   parser.parse()    return build(parser.parse());}

两个关键角色

  • XMLConfigBuilder:专门负责解析mybatis-config.xml的解析器,继承自BaseBuilder
  • Configuration:最终的配置载体,贯穿 MyBatis 整个生命周期。

断点小贴士:直接在 XMLConfigBuilder.parse() 方法第一行打断点,然后 step into,就能走进整个解析世界。

三、parse() 方法:解析总控

// XMLConfigBuilderpublic Configuration parse() {    if (parsed) {        throw new BuilderException("Each XMLConfigBuilder can only be used once.");    }    parsed = true;    // 解析 XML 的根节点 <configuration>    parseConfiguration(parser.evalNode("/configuration"));    return configuration;}

parser.evalNode("/configuration") 返回一个 XNode 对象,它封装了 XML 节点以及一些 XPath 操作。然后进入 parseConfiguration(XNode root)

private void parseConfiguration(XNode root) {    try {        // 按照 DTD 定义顺序,逐个解析子标签        // 1. properties        propertiesElement(root.evalNode("properties"));            // 2. settings        Properties settings = settingsAsProperties(root.evalNode("settings"));         loadCustomVfs(settings);        loadCustomLogImpl(settings);        // 3. typeAliases        typeAliasesElement(root.evalNode("typeAliases"));          // 4. plugins        pluginElement(root.evalNode("plugins"));                   objectFactoryElement(root.evalNode("objectFactory"));        objectWrapperFactoryElement(root.evalNode("objectWrapperFactory"));        reflectorFactoryElement(root.evalNode("reflectorFactory"));        // 5. 把 settings 值设置到 Configuration        settingsElement(settings);                                 // 6. environments        environmentsElement(root.evalNode("environments"));        databaseIdProviderElement(root.evalNode("databaseIdProvider"));        // 7. typeHandlers        typeHandlerElement(root.evalNode("typeHandlers"));         // 8. mappers ⭐ 最复杂        mapperElement(root.evalNode("mappers"));               } catch (Exception e) {        throw new BuilderException("Error parsing SQL Mapper Configuration. Cause: " + e, e);    }}

顺序必须与 DTD 一致,否则 MyBatis 会抛出解析异常 —— 这也是为什么我们在第一篇强调标签顺序的原因。

四、Configuration 核心数据结构

在逐步解析之前,我们先看一眼 Configuration 这个类里到底装着什么(字段非常多,捡重点的):

public class Configuration {    // 环境(数据源、事务工厂)    protected Environment environment;    // 重要:所有 MappedStatement(每个 SQL 对应一个)    protected final Map<StringMappedStatement> mappedStatements = new StrictMap<>("Mapped Statements collection");    // 缓存:二级缓存 namespace -> Cache    protected final Map<StringCache> caches = new StrictMap<>("Caches collection");    // 结果映射    protected final Map<StringResultMap> resultMaps = new StrictMap<>("Result Maps collection");    // 参数映射    protected final Map<StringParameterMap> parameterMaps = new StrictMap<>("Parameter Maps collection");    // 全局设置 (settings 标签解析后的结果)    protected boolean useGeneratedKeys = false;    protected boolean mapUnderscoreToCamelCase = false;    protected ExecutorType defaultExecutorType = ExecutorType.SIMPLE;    // ... 还有几十个}

StrictMap是 MyBatis 自定义的 Map,在 put 时对 key 是否重复做了严格校验(比如两个 Mapper 里有相同 id 的 statement 会报错)。

解析每个标签的目的,就是把 XML 里的信息填充到Configuration的这些字段中。


五、逐标签源码拆解

5.1 <properties>:外部化配置

private void propertiesElement(XNode context) throws Exception {    if (context != null) {        // 收集标签内子标签 <property name="key" value="value"/>        Properties defaults = context.getChildrenAsProperties();        String resource = context.getStringAttribute("resource");        String url = context.getStringAttribute("url");        if (resource != null) {            // 从类路径加载 .properties 文件            defaults.putAll(Resources.getResourceAsProperties(resource));        }        if (url != null) {            defaults.putAll(Resources.getUrlAsProperties(url));        }        Properties vars = configuration.getVariables();        if (vars != null) {          defaults.putAll(vars);        }        parser.setVariables(defaults);        // 合并到 Configuration 的 variables 变量中        configuration.setVariables(defaults);    }}

加载顺序:先加载、后覆盖。具体顺序为:

  1. 首先读取<properties>标签体中的<property>
  2. 然后读取resource/url属性指定的外部属性文件,覆盖同名属性;
  3. 最后读取build()方法传入的Properties,优先级最高,覆盖前面所有同名属性。

例如:方法参数 properties 中的 username 会覆盖配置文件中任何同名的 username 定义。

5.2 <settings>:全局配置

private Properties settingsAsProperties(XNode context) {    if (context == nullreturn new Properties();    Properties props = context.getChildrenAsProperties();    // 校验每个属性名是否在 Configuration 中存在对应的 setter(反射校验)    MetaClass metaConfig = MetaClass.forClass(Configuration.class, reflectorFactory);    for (Object key : props.keySet()) {        if (!metaConfig.hasSetter(String.valueOf(key))) {            throw new BuilderException("The setting " + key + " is not known.  Make sure you spelled it correctly.");        }    }    return props;}

解析后得到的 Properties 暂存,然后调用settingsElement(Properties)挨个设置到Configuration

private void settingsElement(Properties props) {    configuration.setAutoMappingBehavior(AutoMappingBehavior.valueOf(props.getProperty("autoMappingBehavior""PARTIAL")));    configuration.setCacheEnabled(booleanValueOf(props.getProperty("cacheEnabled"), true));    configuration.setLazyLoadingEnabled(booleanValueOf(props.getProperty("lazyLoadingEnabled"), false));    configuration.setMapUnderscoreToCamelCase(booleanValueOf(props.getProperty("mapUnderscoreToCamelCase"), false));    // ... 省略几十行}

5.3<typeAliases>:别名注册

private void typeAliasesElement(XNode context) {    if (context == null) {      return;    }    for (XNode child : context.getChildren()) {      if ("package".equals(child.getName())) {        String typeAliasPackage = child.getStringAttribute("name");        configuration.getTypeAliasRegistry().registerAliases(typeAliasPackage);      } else {        String alias = child.getStringAttribute("alias");        String type = child.getStringAttribute("type");        try {          Class<?> clazz = Resources.classForName(type);          if (alias == null) {            typeAliasRegistry.registerAlias(clazz);          } else {            typeAliasRegistry.registerAlias(alias, clazz);          }        } catch (ClassNotFoundException e) {          throw new BuilderException("Error registering typeAlias for '" + alias + "'. Cause: " + e, e);        }      }    }  }

TypeAliasRegistry 内部维护一个 Map<String, Class<?>>,用于存储别名到类对象的映射关系。后续在 Mapper XML 中写返回类型时,就可以用别名代替全限定类名。

5.4 <environments>:环境配置

private void environmentsElement(XNode context) throws Exception {    if (context == null) {      return;    }    if (environment == null) {      environment = context.getStringAttribute("default");    }    for (XNode child : context.getChildren()) {      String id = child.getStringAttribute("id");      // 关键点:通过 isSpecifiedEnvironment 方法,精准匹配最终选中的 environment      if (isSpecifiedEnvironment(id)) {        // 解析 <transactionManager>        TransactionFactory txFactory = transactionManagerElement(child.evalNode("transactionManager"));        // 解析 <dataSource>        DataSourceFactory dsFactory = dataSourceElement(child.evalNode("dataSource"));        DataSource dataSource = dsFactory.getDataSource();        // 构建 Environment        Environment.Builder environmentBuilder = new Environment.Builder(id).transactionFactory(txFactory)            .dataSource(dataSource);        configuration.setEnvironment(environmentBuilder.build());        break;      }    }  }

Environment对象保存了事务工厂和数据源,后续SqlSessionFactory创建SqlSession时要用到。

5.5 <mappers>:映射器注册(最关键)

private void mappersElement(XNode context) throws Exception {    if (context == null) {      return;    }    for (XNode child : context.getChildren()) {      if ("package".equals(child.getName())) {        // 处理包扫描的方式        String mapperPackage = child.getStringAttribute("name");        configuration.addMappers(mapperPackage);      } else {        // 以下是处理单个 mapper 的三种方式        String resource = child.getStringAttribute("resource");        String url = child.getStringAttribute("url");        String mapperClass = child.getStringAttribute("class");        // 分支1: 通过 resource 指定 XML 文件        if (resource != null && url == null && mapperClass == null) {          ErrorContext.instance().resource(resource);          try (InputStream inputStream = Resources.getResourceAsStream(resource)) {            XMLMapperBuilder mapperParser = new XMLMapperBuilder(inputStream, configuration, resource,                configuration.getSqlFragments());            mapperParser.parse();          }        }        // 分支2: 通过 url 指定 XML 文件        else if (resource == null && url != null && mapperClass == null) {          ErrorContext.instance().resource(url);          try (InputStream inputStream = Resources.getUrlAsStream(url)) {            XMLMapperBuilder mapperParser = new XMLMapperBuilder(inputStream, configuration, url,                configuration.getSqlFragments());            mapperParser.parse();          }        }        // 分支3: 通过 class 属性指定 Mapper 接口类,这主要适用于纯注解的方式        else if (resource == null && url == null && mapperClass != null) {          Class<?> mapperInterface = Resources.classForName(mapperClass);          configuration.addMapper(mapperInterface);        } else {          throw new BuilderException(              "A mapper element may only specify a url, resource or class, but not more than one.");        }      }    }  }

两种映射器注册方式:

  1. 包扫描(<package name="..."/>:会递归扫描包下所有 Mapper 接口,对每个接口调用configuration.addMapper()。最终走到MapperRegistry.addMapper(),内部会为接口创建一个MapperProxyFactory并存入knownMappers,同时在解析过程中找到对应的 XML 映射文件进行处理。
  2. 资源指定(<mapper resource="..."/>:直接指定具体的 XML 映射文件,由XMLMapperBuilder.parse()解析,为每个 SQL 语句生成MappedStatement对象,存入configuration.mappedStatements中。

理解这两种方式的联系与区别,有助于更灵活地配置 MyBatis 映射器扫描策略。

六、面试高频题

Q1:MyBatis 解析配置文件时,如果标签顺序错了会怎样?

A:会抛出 BuilderException。原因在于 MyBatis 的配置文件遵循特定的 DTD 约束,规定了标签的严格顺序(如 propertiessettingstypeAliasestypeHandlers 等标签必须按顺序出现)。如果不遵守这个顺序,XML 解析器在验证阶段就会失败并抛出异常

Q2:Configuration中的mappedStatements为什么用StrictMap而不是普通HashMap

AStrictMap继承HashMap,在put时检查 key 是否已存在,如果存在且不允许覆盖则会报错,避免了 Mapper XML 中id重复导致的隐蔽错误。

Q3:XMLConfigBuilder为什么要设计成只能parse()一次?

A:通过parsed布尔标志控制,防止重复解析同一个配置流导致重复注册、状态错乱。这种设计在框架内部很常见(如 Spring 的AbstractBeanDefinitionReader)。

Q4:<package>扫描 Mapper 接口和<mapper resource="...">的区别?

A

  • <package>包扫描:自动注册包下所有 Mapper 接口,MyBatis 会根据 Mapper 接口的全限定名自动查找对应路径下的 XML 文件(要求 XML 文件与接口同包同名或以注解方式定义 SQL)。适合需要批量注册 Mapper 的场景。
  • <mapper resource> 资源指定:精确指定单个 XML 映射文件,XML 文件可以放在任意符合类路径规则的位置,无需与 Mapper 接口同包。适合需要灵活管理 XML 文件位置或 XML 文件与接口分离存放的场景。

七、下篇预告

第 3 篇我们会深入Mapper 接口动态代理底层,解答“为什么没有实现类也能调用方法”——MapperProxy如何将接口调用转换成SqlSession操作,以及@MapperScan在 Spring 中的注册流程。

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  1. CONNECT:[ UseTime:0.001084s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001731s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000743s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000664s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001475s ]
  6. SELECT * FROM `set` [ RunTime:0.000600s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001524s ]
  8. SELECT * FROM `article` WHERE `id` = 712136 LIMIT 1 [ RunTime:0.001154s ]
  9. UPDATE `article` SET `lasttime` = 1780571691 WHERE `id` = 712136 [ RunTime:0.021533s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001250s ]
  11. SELECT * FROM `article` WHERE `id` < 712136 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004760s ]
  12. SELECT * FROM `article` WHERE `id` > 712136 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.012008s ]
  13. SELECT * FROM `article` WHERE `id` < 712136 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000825s ]
  14. SELECT * FROM `article` WHERE `id` < 712136 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002535s ]
  15. SELECT * FROM `article` WHERE `id` < 712136 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028247s ]
0.266351s