Spring4-自动装配Beans-通过注解@Autowired在构造方法上

1.创建Maven项目,项目名称springdemo19,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>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;

public class Forum {
private int fid;
private String name;
public int getFid() {
return fid;
}
public void setFid(int fid) {
this.fid = fid;
}
public String getName() {
return name;
}
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 org.springframework.beans.factory.annotation.Autowired;

public class ForumPost {
private int pid;
private String name;
private Forum forum;

public ForumPost() {
super();
}

@Autowired
public ForumPost(Forum forum) {
super();
this.forum = forum;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Forum getForum() {
return forum;
}

public void setForum(Forum forum) {
this.forum = forum;
}

}

7.在src/main/resources下创建Bean配置文件,配置文件名称spring-bean.xml,如图所示

8.spring-bean.xml文件的内容如下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 
<bean id="forumpost"
class="com.mycompany.shequ.bean.ForumPost">
</bean>

<bean id="forum" class="com.mycompany.shequ.bean.Forum">
<property name="fid" value="3"></property>
<property name="name" value="@Autowired 在构造方法上"></property>
</bean>

</beans>

9.在src/main/resources下创建spring的核心配置文件applicationContext.xml,如图所示

10.spring的核心配置文件applicationContext.xml的内容如下

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> 
<context:annotation-config />

<import resource="bean/spring-bean.xml"/>

</beans>

11.在src/test/java下创建测试类ForumPostTest,包名(com.mycompany.shequ.bean),如图所示

12.测试类ForumPostTest的内容如下

package com.mycompany.shequ.bean;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ForumPostTest {

/**
* spring 的自动装配Beans,通过注解@Autowired在构造方法上
*/
@Test
public void autowiredTest(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

ForumPost forumPost = (ForumPost) context.getBean("forumpost");

System.out.println(forumPost.getForum().getName());
}
}

13.在测试类ForumPostTest的byTypeTest方法上右键运行,输出结果如图所示