springEL 简单实例

 

  过去一直在用properties与spring的placeHolder

 

  最近3.0有新玩意 试试看了哦

 

 简单用了哈 spring EL

 

 

   1.这个代码 最为系统的配置文件 替代

 

   

package net.xingbo.xu;

import org.springframework.stereotype.Service;

/**
 * Created by IntelliJ IDEA.
 * QQ:15221860
 * MAIL:[e-mail]
 * User: 徐兴波
 * Date: 2009-10-29
 * Time: 20:10:01
 * To change this template use File | Settings | File Templates.
 */
@Service(value = "systemProperties")
public class SysConfig {
    private String DB_TYPE="mysql";


    public String getDB_TYPE() {
        return DB_TYPE;
    }

    public void setDB_TYPE(String DB_TYPE) {
        this.DB_TYPE = DB_TYPE;
    }
}

 

 

 

  2.这个类使用系统配置文件

package net.xingbo.xu;

import org.springframework.stereotype.Service;
import org.springframework.beans.factory.annotation.Value;

/**
 * Created by IntelliJ IDEA.
 * QQ:15221860
 * MAIL:[e-mail]
 * User: 徐兴波
 * Date: 2009-10-29
 * Time: 20:10:56
 * To change this template use File | Settings | File Templates.
 */
@Service(value = "userBean")
public class UserBean {

   //这里注入systemProperties系统bean的名字，做架构可以让项目配置此bean，框架使用；
     @Value("#{systemProperties.DB_TYPE}")
    private String dbType;

    public String getDbType() {
        return dbType;
    }

    public void setDbType(String dbType) {
        this.dbType = dbType;
    }
}

 

 3.spring配置文件，以后想办法这个也不要

 

<?xml version="1.0" encoding="UTF-8"?>
<!-- author zhouyh -->
<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		xmlns:aop="http://www.springframework.org/schema/aop"
		xmlns:tx="http://www.springframework.org/schema/tx"
		xmlns:context="http://www.springframework.org/schema/context"
		xsi:schemaLocation="
	   http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
	   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
       http://www.springframework.org/schema/context  http://www.springframework.org/schema/context/spring-context-2.5.xsd" default-lazy-init="false" >

    <!--<import resource="baseSpringContext-aspectj.xml"/>-->
    <context:component-scan base-package="net.xingbo.xu" />
    


</beans>

 

 4.测试代码

 

package net.xingbo.xu;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.test.com.bobo.TestBean;

/**
 * Created by IntelliJ IDEA.
 * QQ:15221860
 * MAIL:[e-mail]
 * User: 徐兴波
 * Date: 2009-10-29
 * Time: 20:13:47
 * To change this template use File | Settings | File Templates.
 */
public class Test {
     @org.junit.Test
    public void xx() {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-config.xml");
        UserBean userBean = (UserBean) context.getBean("userBean");
        System.out.println(userBean.getDbType());

    }
}

 

 测试结果

 mysql