如何将jndi查找从xml转换为java config [英] how to convert jndi lookup from xml to java config

问题描述

当前，我正在将xml转换为java config.但是我坚持研究了几天.问题出在这里:

Currently I'm converting the xml to java config. But I stuck at some part that I have been research for several days. Here the problem:

Xml配置:

     <jee:jndi-lookup id="dbDataSource" jndi-name="${db.jndi}" resource-ref="true" />

     <beans:bean id="jdbcTemplate"
     class="org.springframework.jdbc.core.JdbcTemplate" >
     <beans:property name="dataSource" ref="dbDataSource"></beans:property>
     </beans:bean>

到目前为止，我设法转换了这段代码:

So far I managed to convert this code:

<jee:jndi-lookup id="dbDataSource" jndi-name="${db.jndi}" resource-ref="true" />

对此:

@Bean(name = "dbDataSource")
public JndiObjectFactoryBean dataSource() {
   JndiObjectFactoryBean bean = new JndiObjectFactoryBean();
   bean.setJndiName("${db.jndi}");
   bean.setResourceRef(true); 
   return bean; 
}

这:

     <beans:bean id="jdbcTemplate"
     class="org.springframework.jdbc.core.JdbcTemplate" >
     <beans:property name="dataSource" ref="dbDataSource"></beans:property>
     </beans:bean>

对此:

@Bean(name = "jdbcTemplate")
public JdbcTemplate jdbcTemplate() { 
   JdbcTemplate jt = new JdbcTemplate();
    jt.setDataSource(dataSource);
    return jt;
   }

问题在于方法 setDataSource()需要DataSource对象，但是我不确定如何将两个bean关联起来.如何将JndiObjectFactoryBean传递给DataSource?

The problem is the method setDataSource() need DataSource object but I'm not sure how to relate both bean.How to pass the JndiObjectFactoryBean to DataSource?

还是我需要使用其他方法?

Or do I need to use another method?

其他问题:

bean.setJndiName("${db.jndi}")， $ {db.jndi} 是引用属性文件，但我总是得到NameNotFoundException，如何使其工作?

The bean.setJndiName("${db.jndi}") , ${db.jndi} is refer to properties file but I always got NameNotFoundException, How to make it work?

谢谢！

推荐答案

使用JndiDataSourceLookup代替JndiObjectFactoryBean.要在方法中使用${db.jndi}，请声明一个方法参数并用@Value对其进行注释.

Instead of JndiObjectFactoryBean use a JndiDataSourceLookup instead. To use the ${db.jndi} in the method declare a method argument and annotate it with @Value.

@Bean(name = "dbDataSource")
public DataSource dataSource(@Value("${db.jndi}" String jndiName) {
    JndiDataSourceLookup lookup = new JndiDataSourceLookup();
    return lookup.getDataSource(jndiName);
}

自动装配的方法和构造函数也可以使用@Value批注. -Spring参考指南.

Autowired methods and constructors can also use the @Value annotation. -- Spring Reference Guide.

@Bean方法基本上是工厂方法，也是自动连接方法，因此属于此类.

@Bean methods are basically factory methods which are also auto wired methods and as such fall into this category.

在用于JdbcTemplate的工厂方法中，您可以简单地使用DataSource方法参数来获取对数据源的引用(如果有多个，则可以在方法参数上使用@Qualifier来指定要使用哪个要使用).

In your factory method for the JdbcTemplate you can simply use a DataSource method argument to get a reference to the datasource (If you have multiple you can use the @Qualifier on the method argument to specify which one you want to use).

@Bean
public JdbcTemplate jdbcTemplate(DataSource ds) { 
    return new JdbcTemplate(ds);
}

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