Configuration类

a.java配置

针对上述的xml配置，可以使用如下的java代码替换：

@Test
public void testConfiguration() {Configuration configuration = new Configuration();// 配置propertiesProperties properties = new Properties();properties.put("driver", "com.mysql.cj.jdbc.Driver");properties.put("url", "jdbc:mysql://localhost:3306/ydlclass");properties.put("username", "root");properties.put("password", "root");configuration.setVariables(properties);// 配置日志处理器configuration.setLogImpl(Slf4jImpl.class);// 配置驼峰命名configuration.setUseActualParamName(true);// 配置别名注册器注册一个包configuration.getTypeAliasRegistry().registerAliases("com.dcy.entity");// 配置Environments的 id、事务工厂、数据源JdbcTransactionFactory jdbcTransactionFactory = new JdbcTransactionFactory();PooledDataSource pooledDataSource = new PooledDataSource();pooledDataSource.setDriver(configuration.getVariables().getProperty("driver"));pooledDataSource.setUrl(configuration.getVariables().getProperty("url"));pooledDataSource.setUsername(configuration.getVariables().getProperty("username"));pooledDataSource.setPassword(configuration.getVariables().getProperty("password"));Environment environment = new Environment("development", jdbcTransactionFactory, pooledDataSource);configuration.setEnvironment(environment);// 配置MapperStaticSqlSource staticSqlSource = new StaticSqlSource(configuration,"insert into account (username,money) values ('Cat', 291)");MappedStatement mappedStatement = new MappedStatement.Builder(configuration,"dcy.insert",staticSqlSource,SqlCommandType.INSERT).build();configuration.addMappedStatement(mappedStatement);}

所有的mybatis.xml的配置项都可以使用Configuration类的形式进行配置

b.构建配置类

一个包装了XPathParser的工具类XMLConfigBuilder，可以将xml的配置文件解析成为一个配置类Configuration，代码如下：

@Test
public void tesXMLConfigBuilder() throws IOException {InputStream inputStream = new ClassPathResource("mybatis.xml").getInputStream();XMLConfigBuilder xmlConfigBuilder = new XMLConfigBuilder(inputStream);Configuration configuration = xmlConfigBuilder.parse();log.info("Configuration -> {}", configuration);
}