2021-05-03 09:46  阅读(97)
文章分类:Spring 入门教程 文章标签:SpringSpring 教程
©  原文作者:一点教程 原文地址:http://www.yiidian.com/spring/

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

202105030946024012_1.png

源码下载:http://pan.baidu.com/s/1bp31pSV

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