Spring4-EL表达式的运算符使用 Spring4-EL表达式的运算符使用

本文转自素颜猪 51CTO博客，原文链接:http://blog.51cto.com/suyanzhu/1910265

1.创建Maven项目,项目名称springdemo46,如图所示

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2.配置Maven,修改项目中的pom.xml文件,修改内容如下

1.0.0 shequ springdemo13 0.0.1-SNAPSHOT1.7UTF-8UTF-8 codelds https://code.lds.org/nexus/content/groups/main-repo javax.annotation jsr250-api 1.0 org.springframework spring-test 4.1.4.RELEASE junit junit 4.10 org.springframework spring-core 4.1.4.RELEASE org.springframework spring-context 4.1.4.RELEASE org.springframework spring-jdbc 4.1.4.RELEASE mysql mysql-connector-java 5.1.34

3.在src/main/java下创建实体Bean Forum,包名(com.mycompany.shequ.bean)如图所示

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4.实体Bean Forum的内容如下

package com.mycompany.shequ.bean; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Component; @Component("forumBean") public class Forum { private boolean equal; private boolean notEqual; private boolean lessThan; private boolean lessThanOrEqual; private boolean greaterThan; private boolean greaterThanOrEqual; private boolean and; private boolean or; private boolean not; private double add; private String addString; private double subtraction; private double multiplication; private double division; private double modulus ; private double exponentialPower; public boolean isEqual() { return equal; } @Value("#{2 == 2}") public void setEqual(boolean equal) { this.equal = equal; } public boolean isNotEqual() { return notEqual; } @Value("#{1 != 1}") public void setNotEqual(boolean notEqual) { this.notEqual = notEqual; } public boolean isLessThan() { return lessThan; } @Value("#{1 < 2}") public void setLessThan(boolean lessThan) { this.lessThan = lessThan; } public boolean isLessThanOrEqual() { return lessThanOrEqual; } @Value("#{1 <= 1}") public void setLessThanOrEqual(boolean lessThanOrEqual) { this.lessThanOrEqual = lessThanOrEqual; } public boolean isGreaterThan() { return greaterThan; } @Value("#{1 > 0}") public void setGreaterThan(boolean greaterThan) { this.greaterThan = greaterThan; } public boolean isGreaterThanOrEqual() { return greaterThanOrEqual; } @Value("#{1 >= 1}") public void setGreaterThanOrEqual(boolean greaterThanOrEqual) { this.greaterThanOrEqual = greaterThanOrEqual; } public boolean isAnd() { return and; } @Value("#{1 == 1 and 1 < 10}") public void setAnd(boolean and) { this.and = and; } public boolean isOr() { return or; } @Value("#{1 == 1 or 1 < 100}") public void setOr(boolean or) { this.or = or; } public boolean isNot() { return not; } @Value("#{!(1 == 999)}") public void setNot(boolean not) { this.not = not; } public double getAdd() { return add; } @Value("#{1 + 1}") public void setAdd(double add) { this.add = add; } public String getAddString() { return addString; } @Value("#{'1' + '-' + '1'}") public void setAddString(String addString) { this.addString = addString; } public double getSubtraction() { return subtraction; } @Value("#{1 - 1}") public void setSubtraction(double subtraction) { this.subtraction = subtraction; } public double getMultiplication() { return multiplication; } @Value("#{1 * 2}") public void setMultiplication(double multiplication) { this.multiplication = multiplication; } public double getDivision() { return division; } @Value("#{10 / 2}") public void setDivision(double division) { this.division = division; } public double getModulus() { return modulus; } @Value("#{10 % 2}") public void setModulus(double modulus) { this.modulus = modulus; } public double getExponentialPower() { return exponentialPower; } @Value("#{2 ^ 3}") public void setExponentialPower(double exponentialPower) { this.exponentialPower = exponentialPower; } }

5.在src/main/resource下创建核心的配置文件applicationContext.xml,如图所示

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6.核心的配置文件applicationContext.xml的内容如下

7.在src/test/java下创建测试文件AppTest,包名(com.mycompany.shequ.test)如图所示

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8.测试文件AppTest的内容如下

package com.mycompany.shequ.test; import org.junit.Test; import org.springframework.context.ConfigurableApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.mycompany.shequ.bean.Forum; public class AppTest { @Test public void beanTest(){ ConfigurableApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); Forum forum = (Forum) context.getBean("forumBean"); System.out.println(forum.getAdd()); System.out.println(forum.getAddString()); //其他的值请自行输出查看 } }

9.在测试类AppTest的beanTest方法上右键运行,输出结果如图所示