基于注解的Spring MVC+Hiberntae简单入门

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