Spring4-EL表达式的运算符使用
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1.创建Maven项目,项目名称springdemo46,如图所示
2.配置Maven,修改项目中的pom.xml文件,修改内容如下
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>1.0.0</modelVersion> <groupId>shequ</groupId> <artifactId>springdemo13</artifactId> <version>0.0.1-SNAPSHOT</version> <properties> <java.version>1.7</java.version> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> </properties> <repositories> <repository> <id>codelds</id> <url>https://code.lds.org/nexus/content/groups/main-repo</url> </repository> </repositories> <dependencies> <dependency> <groupId>javax.annotation</groupId> <artifactId>jsr250-api</artifactId> <version>1.0</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>4.1.4.RELEASE</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.4.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>4.1.4.RELEASE</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.34</version> </dependency> </dependencies> <build/> </project>
3.在src/main/java下创建实体Bean Forum,包名(com.mycompany.shequ.bean)如图所示
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
6.核心的配置文件applicationContext.xml的内容如下
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <context:component-scan base-package="com.mycompany.shequ.bean"/> </beans>
7.在src/test/java下创建测试文件AppTest,包名(com.mycompany.shequ.test)如图所示
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
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