这一章节我们来讨论一下对SpEl的值的运算。
1.domain
烤炉类:(不变)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_17;
public class Oven {
private String name = "";
private double size = 0;
public double getSize() {
return size;
}
public void setSize(double size) {
this.size = size;
}
@Override
public String toString() {
return name + " size:" + size;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
厨师类:(为了方便,降低了friend的属性)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_17;
public class Chief {
private String name = "";
private Oven oven;
public String getName() {
return name;
}
public Oven getOven() {
return oven;
}
public void setName(String name) {
this.name = name;
}
public void setOven(Oven oven) {
this.oven = oven;
}
public void userOven() {
System.out.println(name + " use " + oven);
}
}
2.測试类:(不变)
package com.raylee.my_new_spring.my_new_spring.ch01.topic_1_17;
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_17/ApplicationContext-test.xml" })
public class ChiefTest {
@Autowired
private ApplicationContext applicationContext;
@Test
public void testChief() {
Chief jack = (Chief) applicationContext.getBean("jack");
jack.userOven();
Chief mike = (Chief) applicationContext.getBean("mike");
mike.userOven();
Chief rose = (Chief) applicationContext.getBean("rose");
rose.userOven();
}
}
3.配置文件:(重点)
配置文件的重点就是看Oven里面的size属性。在这里我们能够通过执行符来计算我们须要的值,直接对SpEl的值进行操作。測试输出:
jack use smallOven size:12.566370614359172
mike use smallOven size:6.0
rose use smallOven size:24.0
我们上面仅仅是演示了乘法,它有:+ 加 - 减 * 乘 / 除 % 模 ^平方 这几种运算方式,大家后面能够逐一尝试。
总结:这一章节我们讨论了对SpEl的值的运算。
文件夹:http://blog.csdn.net/raylee2007/article/details/50611627
我的github:https://github.com/raylee2015/my_new_spring