SSH下使用Spring注解自动注入bean

Spring注解的使用方法详见：http://www.ibm.com/developerworks/cn/java/j-lo-spring25-ioc/，这里在SSH框架下做一个例子。

首先导入相关包：spring-beans-3.0.4.RELEASE.jar（org.springframework.beans.factory.annotation.Autowired用来注入bean）、spring-context-3.0.4.RELEASE.jar（org.springframework.stereotype.Componet 、Service、Repository等用来定义bean）。

其次需要添加相关配置：applicationContext.xml

<?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:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> 
<description>Spring公共配置 </description>

<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver"/>
<property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:cui"/>
<property name="username" value="cui"/>
<property name="password" value="cui"/>
</bean>

<!-- 配置sessionFactory -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="packagesToScan">
<list>
<value>com.entity</value>
</list>
</property>
</bean>

<!-- 事务管理 -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<!-- 使用annotation自动注入bean,并启动相关处理注解的进程 -->
<context:component-scan base-package="com">
<context:include-filter type="regex" expression="com/.dao.*"/>
<!-- 正则表达式必须格式正确，否则无效。以下是无效的示例
<context:exclude-filter type="regex" expression="/.service/..*"/>
<context:exclude-filter type="regex" expression="com/.service*"/>
<context:exclude-filter type="regex" expression=".service*"/>
-->
<!-- 正确格式:从base-package开始
<context:exclude-filter type="regex" expression="com/.service.*"/>
<context:exclude-filter type="regex" expression="com/.service/..*"/>
-->
</context:component-scan>

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>mytest</display-name>
<!-- 指定spring配置文件的位置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:/applicationContext.xml</param-value>
</context-param>

<!-- Struts 2 -->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
<init-param>
<param-name>actionPackages</param-name>
<param-value>com.action</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 自动加载applicationContext -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>

使用Hibernate JPA定义User类：

package com.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "s_user")
public class User {

private Long id;
private String username;
private String password;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

@Column(name = "name")
public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

@Column(name = "pwd")
public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

}

Dao层：

package com.dao;

import com.entity.User;

public interface UserDao {
public void save(User user);
}

package com.dao.Impl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.stereotype.Repository;

import com.dao.UserDao;
import com.entity.User;

@Repository("userDao")
public class UserDaoImpl implements UserDao {

private HibernateTemplate template;
private Log log = LogFactory.getLog(UserDaoImpl.class);

//使用构造子注入自动注入sessionFactory
@Autowired
public UserDaoImpl(SessionFactory sessionFactory) {
this.template = new HibernateTemplate(sessionFactory);
}

public void save(User user) {
template.save(user);
log.debug("save user:" + user.getUsername());
}
}

Service层：

package com.service;
import com.entity.User;

public interface UserManager {
public void add(User user);
}

package com.service.Impl;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.dao.UserDao;
import com.entity.User;
import com.service.UserManager;

@Service("userManager")
public class UserManagerImpl implements UserManager {

//自动注入userDao，也可以使用@Resource
@Autowired
private UserDao userDao;
private Log log = LogFactory.getLog(UserManagerImpl.class);

public void add(User user) {
userDao.save(user);
log.debug("add User:" + user.getUsername());
}
}

Action：

package com.action.convention;

import org.apache.struts2.convention.annotation.Result;
import org.springframework.beans.factory.annotation.Autowired;

import com.entity.User;
import com.opensymphony.xwork2.ActionSupport;
import com.service.UserManager;

@Result(name = "success", location = "hello.jsp")
public class UserAction extends ActionSupport {

private static final long serialVersionUID = 1L;

@Autowired
private UserManager userManager;

public String execute() {
User user = new User();
user.setUsername("cuihaiyang");
user.setPassword("abcd");

userManager.add(user);

return SUCCESS;
}
}

调试信息如下：

Hibernate: select hibernate_sequence.nextval from dual
Hibernate: insert into s_user (pwd, name, id) values (?, ?, ?)
2011-03-10 19:44:25,296 [http-8080-1] DEBUG [com.dao.Impl.UserDaoImpl] - save user:cuihaiyang
2011-03-10 19:44:25,296 [http-8080-1] DEBUG [com.service.Impl.UserManagerImpl] - add User:cuihaiyang