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基于注解的Spring MVC+Hiberntae简单入门

 
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1、概述

本文旨在搭建Spring MVC+Hibernate开发框架，通过一个简单的demo讲解Spring MVC的相关配置文件，以及通过注解方式实现简单功能。

开发框架：Spring + Spring MVC+Hibernate（Spring所用的版本为3.0.5）。

数据库：MySQL（数据库名称test，demo工程所用的表名为user_info）。

2、开发框架搭建

2.1 创建工程

         在Eclipse的Java EE版本或MyEclipse中创建一个Dynamic Web Project。并创建如下包：

（1）com.dao：系统的DAO；

（2）com.model：表的实体类（使用Hibernate），在该工程中不配置.hbm.xml映射文件，采取注解的方式；

（3）com.service：业务逻辑接口类和实现类；

（4）com.web：Spring MVC的Controllor类；

（5）com.config：Spring和Spring MVC的配置文件。

创建成功后包结构如下所示：
   springmvctest
        src 
        ----com
            ----amigo
                ----dao
                ----model
                ----service
                ----web
         ----config
         WebContent
         ----META-INF
         ----WEB-INF
             ----lib
             ----classes

 

2.2 引入相关包

         需要将Spring、Spring MVC、Hibernate、MySQL驱动、log4j、c3p0数据源等的相关包引入。lib目录下的jar包如下：
      antlr-2.7.6.jar
      aopalliance.jar
      asm-attrs.jar
      asm.jar
      c3p0-0.9.0.jar
      cglib-2.1.3.jar
      commons-beanutils-1.8.0.jar
      commons-beanutils-bean-collections-1.8.0.jar
      commons-betwixt-0.8.jar
      commons-collections-2.1.1.jar
      commons-digester-2.1.jar
      commons-discovery-0.2.jar
      commons-httpclient.jar
      commons-logging.jar
      dom4j-1.6.1.jar
      ehcache-1.2.3.jar
      ejb3-persistence.jar
      hibernate-annotations.jar
      hibernate-commons-annotations.jar
      hibernate-entitymanager.jar
      hibernate-validator.jar
      hibernate3.jar
      jaas.jar
      javassist.jar
      jaxen-1.1-beta-7.jar
      jaxrpc.jar
      jboss-archive-browsing.jar
      jdbc2_0-stdext.jar
      jta.jar
      log4j-1.2.11.jar
      mysql-connector-java-5.0.4-bin.jar
      org.springframework.aop-3.0.5.RELEASE.jar
      org.springframework.asm-3.0.5.RELEASE.jar
      org.springframework.aspects-3.0.5.RELEASE.jar
      org.springframework.beans-3.0.5.RELEASE.jar
      org.springframework.context-3.0.5.RELEASE.jar
      org.springframework.context.support-3.0.5.RELEASE.jar
      org.springframework.core-3.0.5.RELEASE.jar
      org.springframework.expression-3.0.5.RELEASE.jar
      org.springframework.instrument-3.0.5.RELEASE.jar
      org.springframework.instrument.tomcat-3.0.5.RELEASE.jar
      org.springframework.jdbc-3.0.5.RELEASE.jar
      org.springframework.jms-3.0.5.RELEASE.jar
      org.springframework.orm-3.0.5.RELEASE.jar
      org.springframework.oxm-3.0.5.RELEASE.jar
      org.springframework.test-3.0.5.RELEASE.jar
      org.springframework.transaction-3.0.5.RELEASE.jar
      org.springframework.web-3.0.5.RELEASE.jar
      org.springframework.web.servlet-3.0.5.RELEASE.jar
      saaj.jar 
      wsdl4j.jar
      xerces-2.6.2.jar
      xml-apis.jar

 

2.3 配置文件

2.3.1 配置web.xml

         在web.xml中需要配置Spring的配置文件（applicationContext.xml）和Spring MVC配置文件（spring-mvc.xml），配置指定所有.do的请求都由Spring的DispatcherServlet类进行处理。

web.xml文件的参考配置如下：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
 <display-name>springmvctest</display-name>
 <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:config/applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>    org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <servlet>
        <servlet-name>spring-mvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:config/spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>spring-mvc</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

 

 

 

2.3.2 配置spring的配置文件

 

         Spring的配置文件applicationContext.xml文件中主要配置对Hibernate的事务的管理，该配置文件的参考配置如下：

<?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"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/task   
http://www.springframework.org/schema/task/spring-task-3.0.xsd"> 
    <context:annotation-config />

    <!-- 扫描annotation类，过滤Service，Repository -->
    <context:component-scan base-package="com.amigo" >
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" />
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" />
    </context:component-scan>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass">
           <value>com.mysql.jdbc.Driver</value>
        </property>
        <property name="jdbcUrl">
<value>jdbc:mysql://localhost/test</value> 
        </property>
        <property name="user">
            <value>root</value>
        </property>
        <property name="password">
            <value>123456</value>
        </property>
        <property name="maxPoolSize">
            <value>80</value>
        </property>
        <property name="minPoolSize">
            <value>1</value>
        </property>
        <property name="initialPoolSize">
            <value>1</value>
        </property>
        <property name="maxIdleTime">
            <value>20</value>
        </property>
    </bean>
    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="packagesToScan" value="com.amigo.model*" ></property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <prop key="show_sql">true</prop>
                <prop key="hibernate.jdbc.batch_size">20</prop>
            </props>
        </property>
    </bean>

    <!-- 不破坏数据库,注册SessionFactory -->
    <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"></property>
    </bean>
    <bean id="transactionInterceptor"
class="org.springframework.transaction.interceptor.TransactionInterceptor">
        <property name="transactionManager" ref="transactionManager"></property>
        <property name="transactionAttributes">
            <props>
                <prop key="save*">PROPAGATION_REQUIRED</prop>
                <prop key="update*">PROPAGATION_REQUIRED</prop>
                <prop key="delete*">PROPAGATION_REQUIRED</prop>
                <prop key="find*">PROPAGATION_REQUIRED</prop>
                <prop key="get*">PROPAGATION_REQUIRED</prop>
                <prop key="execute*">PROPAGATION_REQUIRED</prop>
                <prop key="load*">PROPAGATION_REQUIRED</prop>
                <prop key="merge*">PROPAGATION_REQUIRED</prop>
                <prop key="add*">PROPAGATION_REQUIRED</prop>
            </props>
        </property>
    </bean>
    <bean
class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
        <property name="beanNames">
            <list>
                <value>*Service</value>
            </list>
        </property>
        <property name="interceptorNames">
            <list>
         <value>transactionInterceptor</value>
            </list>
        </property>
    </bean> 
</beans>



 

 

2.3.3 配置Spring MVC配置文件

 

Spring MVC的配置文件spring-mvc.xml中主要是Controller的配置信息，该文件的参考配置如下：

<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc 
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"   
    default-lazy-init="true">
    <context:annotation-config />
    <!--使Spring支持自动检测组件，如注解的Controller -->
    <context:component-scan base-package="com.amigo.web"/>

    <bean id="viewResolver"      class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          p:prefix="/WEB-INF"
          p:suffix=".jsp" />
    
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <!-- 启动 Spring MVC 的注解功能，完成请求和注解 POJO 的映射 -->
    <bean     class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter"> 
                </bean>
            </list>
        </property>
    </bean>
</beans>

 

2.4 创建数据库和表

创建test数据库和user_info表的SQL语句如下（为了简便，user_info只有一个USER_NAME字段）：

CREATE DATABASE test;
USER test;
CREATE TABLE user_info (
 USER_NAME varchar(32) NOT NULL,
 PRIMARY KEY (USER_NAME)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;



3、实例代码

3.1 DAO层

BaseHibernateDao类的代码如下所示：

package com.amigo.dao;

import javax.annotation.Resource;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.dao.DataAccessResourceFailureException;
import org.springframework.dao.support.DaoSupport;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.SessionFactoryUtils;

public class BaseHibernateDao extends DaoSupport{
    private SessionFactory sessionFactory;
    private HibernateTemplate hibernateTemplate;
    public SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    @Resource(name="sessionFactory")
    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
        this.hibernateTemplate=createHibernateTemplate(sessionFactory);
    }

    public Session getSession() {
        if (this.sessionFactory == null) {
            throw new HibernateException("Session Create Fail,SessionFactory is null!");
        }
        return this.sessionFactory.getCurrentSession();
    }

    protected HibernateTemplate createHibernateTemplate(
            SessionFactory sessionFactory) {
        return new HibernateTemplate(sessionFactory);
    }

    @Override
    protected void checkDaoConfig() throws IllegalArgumentException {
        if (this.hibernateTemplate == null) {
            throw new IllegalArgumentException("'sessionFactory' or 'hibernateTemplate' is required");
        }
    }
    
    protected final Session getSession(boolean allowCreate)
            throws DataAccessResourceFailureException, IllegalStateException {
        return (!allowCreate ? SessionFactoryUtils.getSession(
                getSessionFactory(), false) : SessionFactoryUtils.getSession(
                getSessionFactory(),

     this.hibernateTemplate.getEntityInterceptor(),    this.hibernateTemplate.getJdbcExceptionTranslator()));
    }

    protected final DataAccessException convertHibernateAccessException(
            HibernateException ex) {
        return this.hibernateTemplate.convertHibernateAccessException(ex);
    }

    protected final void releaseSession(Session session) {
        SessionFactoryUtils.releaseSession(session, getSessionFactory());
        if(null!=session)session=null;
    }

    public final void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }

    public final HibernateTemplate getHibernateTemplate() {
        return this.hibernateTemplate;
    }
}

USER_INFO表的Dao类UserInfoDao类的代码如下所示：

package com.amigo.dao;
import org.springframework.stereotype.Repository;

@Repository
public class UserInfoDao extends BaseHibernateDao {
}

 

3.2 业务逻辑层

接口类IHelloService的代码如下：

package com.amigo.service;
public interface IHelloService {
    public int addUser(String userName) throws Exception;;
}

 

实现类HelloService类的代码如下：

package com.amigo.service;
import javax.annotation.Resource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Repository;
import org.springframework.stereotype.Service;

import com.amigo.dao.UserInfoDao;
import com.amigo.model.UserInfo;

@Service("helloService")
@Repository
public class HelloService implements IHelloService {
    private static final Log log = LogFactory.getLog(HelloService.class);
    private UserInfoDao userDao;

    public UserInfoDao getUserDao() {
        return userDao;
    }

    @Resource
    public void setUserDao(UserInfoDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public int addUser(String userName) throws Exception {
        log.info("----------------addUser---------------");
        UserInfo userInfo = new UserInfo();
        userInfo.setUserName(userName);
        userDao.getSession().save(userInfo);
        return 1;
    }
}



3.3 控制层

   控制类HelloControllor类接收userName参数，并调用相应的Service类将用户名保存到USER_INFO表中，该类的代码如下：

package com.amigo.web;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.amigo.service.IHelloService;

@Controller
@RequestMapping("/test")
public class HelloControllor {
    private static final Log log = LogFactory.getLog(HelloControllor.class);

    private IHelloService helloService;

    public IHelloService getHelloService() {
        return helloService;
    }

    @Resource
    public void setHelloService(IHelloService helloService) {
        this.helloService = helloService;
    }

    @RequestMapping("/hello.do")
    public @ResponseBody 
        String sayHello(HttpServletRequest request, HttpServletResponse response) throws Exception {
        request.setCharacterEncoding("UTF-8");
        String userName = request.getParameter("userName");
        log.info("userName=" + userName);
        int resultCode = helloService.addUser(userName);
        String rspInfo = "你好!" + userName + ",操作结果码=" + resultCode;
        response.setHeader("Content-type","text/html;charset=UTF-8"); 
        response.getOutputStream().write(rspInfo.getBytes("UTF-8"));
        return "";
    }
}

@Controller注解标识一个控制器，@RequestMapping注解标记一个访问的路径；如果@RequestMapping注解在类级别上，则表示一相对路径，在方法级别上，则标记访问路径；

4、测试

测试时可以通过访问http://localhost:8080/springmvctest/test/hello.do?userName=amigo777，通过userName参数将用户名添加到USER_INFO表中。

从实例代码可以看出，POJO、DAO层、Service层和Controller层都是采用注解的方式将service、dao注入的，减少了配置量，方便了开发工作。

5、参考文档

（1）《基于注解的Spring MVC简单入门》：http://www.oschina.net/question/84460_9608、

posted on 2012-11-28 11:07 阿蜜果 阅读(15743) 评论(10)  编辑  收藏 所属分类: Java
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