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Spring4-EL从 Map 和 List 中获取元素
1.创建Maven项目,项目名称springdemo47,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 int fid; private String name; private String listName; public String getListName() { return listName; } @Value("#{forumPostBean.lists[0]}") public void setListName(String listName) { this.listName = listName; } public int getFid() { return fid; } public void setFid(int fid) { this.fid = fid; } public String getName() { return name; } @Value("#{forumPostBean.maps[‘map1‘]}") public void setName(String name) { this.name = name; } }
5.在src/main/java下创建实体Bean ForumPost,包名(com.mycompany.shequ.bean)如图所示
6.实体Bean ForumPost的内容如下
package com.mycompany.shequ.bean; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import org.springframework.stereotype.Component; @Component("forumPostBean") public class ForumPost { private Map<String,String> maps; private List<String> lists; public ForumPost() { super(); lists = new ArrayList<String>(0); lists.add("list1"); lists.add("list2"); maps = new HashMap<String, String>(); maps.put("map1", "value1"); maps.put("map2", "value2"); } public Map<String, String> getMaps() { return maps; } public void setMaps(Map<String, String> maps) { this.maps = maps; } public List<String> getLists() { return lists; } public void setLists(List<String> lists) { this.lists = lists; } }
7.在src/main/resource下创建核心的配置文件applicationContext.xml,如图所示
8.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>
9.在src/test/java下创建测试文件AppTest,包名(com.mycompany.shequ.test)如图所示
10.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.getName()); System.out.println(forum.getListName()); } }
11.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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Spring4-EL从 Map 和 List 中获取元素
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