SpringEL-方法调用

SpEL允许开发者用El运行方法函数，并且允许将方法返回值注入到属性中。

一、编写Bean类

TestMethod类

package com.yiidian;
/**
 * 
 * @author http://www.yiidian.com
 *
 */
public class TestMethod {

	public Double getPrice(){
		return 199.99D;
	}
}

Customer类：

package com.yiidian.domain;

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

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="testMethod" class="com.yiidian.TestMethod"></bean>

	<bean id="customer" class="com.yiidian.domain.Customer">
		<property name="name" value="#{'yiidian'.toUpperCase()}"/>
		<property name="amount" value="#{testMethod.getPrice()}"/>
	</bean>

	 
</beans>

注意：

#{'yiidian'.toUpperCase()}： 这句代表调用字符串toUpperCase()方法

#{testMethod.getPrice()}： 这句代表调用TestMehod对象的getPrice()方法

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);
	}

}

四、运行结果

源码下载：http://pan.baidu.com/s/1bp31pSV