使用SpringEL操作List和Map集合

2020-03-11 16:02:38来源：博客园阅读 ()

使用SpringEL操作List和Map集合

原文链接：http://www.yiidian.com/spring/spring-el-bean.html

这个例子演示SpEL表达式怎样从List、Map集合中取值，示例如下：

一、编写Bean类

TestCollection类，用于创建Map和List对象

package com.yiidian.collection;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
 * 
 * @author http://www.yiidian.com
 *
 */
public class TestCollection {
    private Map<String, String> nameMap;
    private List<String> teleList;

    public TestCollection() {
        nameMap = new HashMap<String, String>();
        nameMap.put("001", "张三");
        nameMap.put("002", "李四");
        nameMap.put("003", "王五");

        teleList = new ArrayList<String>();
        teleList.add("13422223333");
        teleList.add("13544446666");
        teleList.add("13788889999");

    }

    public Map<String, String> getNameMap() {
        return nameMap;
    }

    public void setNameMap(Map<String, String> nameMap) {
        this.nameMap = nameMap;
    }

    public List<String> getTeleList() {
        return teleList;
    }

    public void setTeleList(List<String> teleList) {
        this.teleList = teleList;
    }
    
}

Customer类：

package com.yiidian.domain;

import java.io.Serializable;
/**
 * 
 * @author http://www.yiidian.com
 *
 */
public class Customer implements Serializable{
    private String name;
    private String telephone;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getTelephone() {
        return telephone;
    }
    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }
    @Override
    public String toString() {
        return "Customer [name=" + name + ", telephone=" + telephone + "]";
    }
    
}

二、配置applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    <bean id="testCollection" class="com.yiidian.collection.TestCollection"></bean>

    <bean id="customer" class="com.yiidian.domain.Customer">
        <property name="name" value="#{testCollection.nameMap['001']}"/>
        <property name="telephone" value="#{testCollection.teleList[0]}"/>
    </bean>

     
</beans>

三、编写测试类

package com.yiidian.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.yiidian.domain.Customer;

/**
 * @author http://www.yiidian.com
 * 
 */
public class Demo1 {

    @Test
    public void test1() {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        Customer customer = (Customer)context.getBean("customer");
        System.out.println(customer);
    }

}