Understanding the value of Spring-1.15 to Spel from the beginning (2)-contrast value

In this chapter we discuss the value of the Spel value.

1.domain

Oven class: (Added Bigornot property)

Package Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18;public class Oven {private String name = "";p rivate Double size = 0;private Boolean bigornot = False;public Boolean isbigornot () {return bigornot;} public void Setbigornot (Boolean bigornot) {this.bigornot = Bigornot;} Public double GetSize () {return size;} public void SetSize (double size) {this.size = size;} @Overridepublic String toString () {return name + "Size:" + size;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;}}

Chef class: (Increase the method of checking the oven)

Package Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18;public class Chief {private String name = "";p rivate Oven oven;public void Checkoven () {if (Getoven (). Isbigornot ()) {System.out.println (Getoven ()); SYSTEM.OUT.PRINTLN ("oven is big");} else {System.out.println (Getoven ()); SYSTEM.OUT.PRINTLN ("Oven is not big");}} 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;}}

2. Test class: (replace the oven with a check oven)

Package Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18;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_18/ Applicationcontext-test.xml "}) public class Chieftest {@Autowiredprivate ApplicationContext applicationcontext;@ testpublic void Testchief () {Chief Jack = (Chief) Applicationcontext.getbean ("Jack"); Jack.checkoven (); Chief Mike = (Chief) Applicationcontext.getbean ("Mike"); Mike.checkoven (); Chief Rose = (chief) Applicationcontext.getbean ("Rose"); Rose.checkoven ();}}

3. Configuration file: (Focus)

<?xml version= "1.0" encoding= "UTF-8"? ><beans xmlns= "Http://www.springframework.org/schema/beans" xmlns: context= "Http://www.springframework.org/schema/context" xmlns:p= "http://www.springframework.org/schema/p" xmlns: Xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns:tx= "Http://www.springframework.org/schema/tx" xmlns:aop= " Http://www.springframework.org/schema/aop "xsi:schemalocation=" Http://www.springframework.org/schema/beans http ://www.springframework.org/schema/beans/spring-beans-3.1.xsdhttp://www.springframework.org/schema/context http ://www.springframework.org/schema/context/spring-context-3.1.xsdhttp://www.springframework.org/schema/tx http:/ /www.springframework.org/schema/tx/spring-tx-3.1.xsdhttp://www.springframework.org/schema/util/HTTP WWW.SPRINGFRAMEWORK.ORG/SCHEMA/UTIL/SPRING-UTIL-3.1.XSDHTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/DATA/JPA/HTTP Www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsdhttp://www.springframework.org/schema/beans/HTTP Www.sprinGframework.org/schema/beans/spring-beans.xsd HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP/HTTP Www.springframework.org/schema/aop/spring-aop.xsd "><bean id=" Smalloven "class=" com.raylee.my_new_spring.my _new_spring.ch01.topic_1_18.oven "P:name=" Smalloven "p:size=" #{2*5} "p:bigornot=" #{10 >= 8} "/><bean id=" Midoven "class=" Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18.Oven "p:name=" Midoven "p:size=" #{t ( Java.lang.Math). PI*4} "p:bigornot=" #{smalloven.getsize () Lt 8} "/><bean id=" Bigoven "class=" Com.raylee.my_new_spring.my_new_ Spring.ch01.topic_1_18.Oven "P:name=" Bigoven "p:size=" #{smalloven.getsize () "p:bigornot=" #{midoven.getsize () GT 8} "/><bean id=" Mike "class=" Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18.Chief "P:name=" Mike "> <property name= "oven" ref= "Smalloven"/></bean><bean id= "Jack" class= "Com.raylee.my_new_spring.my_ New_spring.ch01.topic_1_18.Chief "P:name=" Jack "><property name=" oven "ref=" Midoven "/&GT;&LT;/BEAN&GT;<bean id= "Rose" class= "Com.raylee.my_new_spring.my_new_spring.ch01.topic_1_18.Chief" P:name= "Rose" >< Property name= "Oven" ref= "Bigoven"/></bean></beans>

The focus of the configuration file is to look at the P:bigornot property inside the oven, where we can compare two values by contrast to produce the final result.

Test output:

Midoven size:12.566370614359172
Oven is not big
Smalloven size:10.0
Oven is big
Bigoven size:40.0
Oven is big

We just showed the part above, it has:> greater than < less than >= is equal to <= less than equals = = equals, everyone behind can try each.

Summary: In this chapter we discuss the value of the Spel values.

Catalog: http://blog.csdn.net/raylee2007/article/details/50611627

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

Understanding the value of Spring-1.15 to Spel from the beginning (2)-contrast value