2021-05-03 09:46  阅读(89)
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支持三目运算符,以此来实现条件语句。

一、编写Bean类

Item类:

    
    package com.yiidian.domain;
    /**
     * 
     * @author http://www.yiidian.com
     *
     */
    public class Item {
    	
    	private int qtyOnHand;
        public int getQtyOnHand() {
            return qtyOnHand;
        }
     
        public void setQtyOnHand(int qtyOnHand) {
            this.qtyOnHand = qtyOnHand;
        }
    }
    

Customer类:

    
    package com.yiidian.domain;
    
    import java.io.Serializable;
    /**
     * 
     * @author http://www.yiidian.com
     *
     */
    public class Customer implements Serializable{
        private boolean warning;
        public boolean isWarning() {
            return warning;
        }
        public void setWarning(boolean warning) {
            this.warning = warning;
        }
     
        @Override
        public String toString() {
            return "Customer [warning=" + warning + "]";
        }
    }
    	

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="customer" class="com.yiidian.domain.Customer">
            <property name="warning" value="#{itemBean.qtyOnHand < 100 ? true : false}" />
        </bean>
     
        <bean id="itemBean" class="com.yiidian.domain.Item">
            <property name="qtyOnHand" value="99" />
        </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);
    	}
    
    }
    

四、运行结果

202105030946024013_1.png

源码下载:http://pan.baidu.com/s/1qYmLKfE

点赞(0)
版权归原创作者所有,任何形式转载请联系作者; Java 技术驿站 >> SpringEL-三目运算
上一篇
SpringEL-运算符
下一篇
SpringEL-正则表达式