这一章节我们来讨论一下SpEl表达式的简单介绍与嵌入值。

1.SpEl表达式简单介绍

Spring Excpression Language (SpEL)语言支持在执行时操作和查询对象

事实上就是在执行的过程中操作对应的对象或者值。


2.SpEl嵌入值

(1)domain

蛋糕类:(不变)

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_14;

public class Cake {

	private int id = 0;

	private String name = "";

	private double size = 0;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public double getSize() {
		return size;
	}

	public void setSize(double size) {
		this.size = size;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	@Override
	public String toString() {
		return "cake id:" + id + " name:" + name + " size:" + size;
	}

}

(2)測试类:(打印蛋糕对象的属性)

package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_14;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
		"/com/raylee/my_new_spring/my_new_spring/ch01/topic_1_14/ApplicationContext-test.xml" })
public class CakeTest {

	@Autowired
	private ApplicationContext applicationContext;

	@Test
	public void testCake() {
		Cake cake = applicationContext.getBean(Cake.class);
		System.out.println(cake);
	}
}

(3)配置文件



通过#{}把实际的值嵌入到对应的属性里面。当然事实上是嵌入值是没什么意思,由于这样已经把程序给写死了。


測试输出:

cake id:1 name:blueberry cheese cake size:5.5


总结:这一章节主要介绍SpEl表达式的简单介绍与嵌入值。


文件夹:http://blog.csdn.net/raylee2007/article/details/50611627 

 

我的github:https://github.com/raylee2015/my_new_spring



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