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[Java教程]SSH整合(struts2.3.24+hibernate3.6.10+spring4.3.2+mysql5.5+myeclipse8.5+tomcat6+jdk1.6)


终于开始了ssh的整合,虽然现在比较推崇的是,ssm(springmvc+spring+mybatis)这种框架搭配确实比ssh有吸引力,因为一方面springmvc本身就是遵循spring标准,所以不用像struts那样添加jar包去管理,其次是mybatis不能算一个完全的orm框架(因为mybatis依旧写的是面向关系的sql)但是相比ssh更加灵活和优化更加容易。

貌似偏题了,重新说回ssh整合。

首先引入jar包:(这里需要新建一个web项目,如果你不知道怎么在myeclipse怎么新建一个web项目,那么你需要做的不是整合ssh,而是回去重新翻一遍java的IDE使用手册)

struts2(常规jar包):

 

 hibernate常规jar包:

 

spring jar包(包括core,aop,jdbc,tx,orm,spring-struts)ps:下图里面tx类的jar包被分在了aop中,因为aop中要用到事务,所以就不单独建一个user library

 

 

mysql的jdbc的jar包:

 mysql-connector-java-5.0.8-bin.jar

 接着来看项目结构:

很简答的三层:dao,service,action,javabean放在entity包下面,所有的都写在配置文件里(spring管理的bean,hibernate的属性,struts2action的配置)

 mysql的mybatis数据库中有两张表:

t_user

_dept

有人说干嘛起这样的名字,我只能说,我愿意你咬我啊(当然,这里肯定不是,一方面是避免和数据库中关键字重名,一方面是也可以表明这是数据库的表,免得和别的数据库中搞混)

user表里有四个字段,一个id,一个username,一个password,一个关联部门表的外键

dept中有两个字段,一个部门编号(deptNo),一个部门名称(deptName)

好了,准备条件都写好了,现在可以开始写

UserDao中三个方法,直接贴代码:

package com.mz.dao;import java.io.Serializable;import java.util.List;import org.hibernate.Query;import org.hibernate.SessionFactory;import org.hibernate.classic.Session;import com.mz.entity.User;public class UserDao {  private SessionFactory sessionFactory;  //保存一个user对象到数据库  public boolean save(User user) {    Serializable serializable = sessionFactory.getCurrentSession().save(user);    System.out.println("serializable:" + serializable);    return true;  }  //通过id寻找到user  public User getUserById(int id) {    User user = (User) sessionFactory.getCurrentSession().get(User.class, id);    return user;  }  //通过部门编号寻找到一个list的user  public List<User> getUserByDept(int deptNo) {    String hql = "from User user where user.dept.deptNo = ?";    Session session = this.sessionFactory.getCurrentSession();    //Criteria criteria = session.createCriteria(hql);    Query query = session.createQuery(hql);    query.setInteger(0, deptNo);    List<User> users = query.list();    return users;  }  public SessionFactory getSessionFactory() {    return sessionFactory;  }  public void setSessionFactory(SessionFactory sessionFactory) {    this.sessionFactory = sessionFactory;  }    }

 

通过hibernate中的SessionFactory建立数据持久层。有人说为什么本来该有事务的地方现在却没有了,我只能说,你还没看完,这部份已经被spring声明式事务管理了好吧。

其次是UserService,简化之后只有一个方法:

package com.mz.service;import com.mz.dao.UserDao;import com.mz.entity.User;public class UserService {  private UserDao userDao;    public User getUser(int id) {    User user = userDao.getUserById(id);    return user;  }  public UserDao getUserDao() {    return userDao;  }  public void setUserDao(UserDao userDao) {    this.userDao = userDao;  }    }

 

然后是UserAction层,依然只有一个方法(省略了一些东西没有介绍,毕竟这里很多东西是struts的,本文重点介绍的是spring整合):

package com.mz.action;import java.util.Map;import org.apache.struts2.interceptor.RequestAware;import com.mz.entity.User;import com.mz.service.UserService;import com.opensymphony.xwork2.ActionSupport;public class UserAction extends ActionSupport implements RequestAware{  private Map<String, Object> request;    private UserService userService;    public String execute() {    int id = 2;    User user = userService.getUser(id);    request.put("user", user);    return SUCCESS;  }  public Map<String, Object> getRequest() {    return request;  }  public void setRequest(Map<String, Object> request) {    this.request = request;  }  public UserService getUserService() {    return userService;  }  public void setUserService(UserService userService) {    this.userService = userService;  }      }

 

 

查找id为2的user并且存储到request中,最后返内部跳转。

最后来看javabean:

User.java:

 

package com.mz.entity;public class User {  private int id;    private String username;    private String password;      private Dept dept;  public int getId() {    return id;  }  public void setId(int id) {    this.id = id;  }  public String getUsername() {    return username;  }  public void setUsername(String username) {    this.username = username;  }  public String getPassword() {    return password;  }  public void setPassword(String password) {    this.password = password;  }  public Dept getDept() {    return dept;  }  public void setDept(Dept dept) {    this.dept = dept;  }    }

 

User的hibernate映射文件User.hbm.

<??><!DOCTYPE hibernate-mapping PUBLIC   "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"><hibernate-mapping >  <class name="com.mz.entity.User" table="t_user">    <id name="id" column="id">      <generator class="native" />    </id>     <property name="username" column="username" ></property>        <property name="password" column="password"></property>        <many-to-one name="dept" column="deptNo" class="com.mz.entity.Dept"></many-to-one>  </class></hibernate-mapping>

 

Dept.java

package com.mz.entity;public class Dept {  private int deptNo;    private String deptName;  public int getDeptNo() {    return deptNo;  }  public void setDeptNo(int deptNo) {    this.deptNo = deptNo;  }  public String getDeptName() {    return deptName;  }  public void setDeptName(String deptName) {    this.deptName = deptName;  }    }

 

Dept的映射文件Dept.hbm.

<??><!DOCTYPE hibernate-mapping PUBLIC   "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">  <!--    This mapping demonstrates content-based discrimination for the    table-per-hierarchy mapping strategy, using a formula discriminator.  --><hibernate-mapping >  <class name="com.mz.entity.Dept" table="_dept">    <id name="deptNo" column="deptNo">      <generator class="native" />    </id>     <property name="deptName" column="deptName" ></property>      </class></hibernate-mapping>

 

好了,接下来就是配置文件的事情了:

struts.

<??><!DOCTYPE struts PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  "http://struts.apache.org/dtds/struts-2.3.dtd"><struts>  <package name="user" namespace="/" extends="struts-default">    <!-- 这里的userAction配置在bean.-->    <action name="user" class="userAction">      <result name="success">/index.jsp</result>    </action>  </package></struts>

 

接着是bean.

<??><beans ="http://www.springframework.org/schema/beans"  ="http://www.w3.org/2001/  ="http://www.springframework.org/schema/p"  ="http://www.springframework.org/schema/context"  ="http://www.springframework.org/schema/aop"  ="http://www.springframework.org/schema/tx"  xsi:schemaLocation="    http://www.springframework.org/schema/beans    http://www.springframework.org/schema/beans/spring-beans.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context.xsd     http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx.xsd">       <!-- 配置dataSource -->      <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" >      <property name="driverClass" value="com.mysql.jdbc.Driver"></property>      <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/mybatis"></property>      <property name="user" value="root"></property>      <property name="password" value="111111"></property>      <property name="initialPoolSize" value="3"></property>      <property name="maxPoolSize" value="10"></property>      <property name="acquireIncrement" value="2"></property>      <property name="maxStatements" value="10"></property>      </bean>      <!-- 配置dao -->   <bean id="userDao" class="com.mz.dao.UserDao" >     <property name="sessionFactory" ref="sessionFactory"></property>   </bean>      <!-- 配置action -->   <bean id="userAction" class="com.mz.action.UserAction">     <property name="userService" ref="userService"></property>   </bean>         <!-- 配置service -->   <bean id="userService" class="com.mz.service.UserService">     <property name="userDao" ref="userDao"></property>   </bean>   <!-- 配置sessionFactory -->   <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">   <!-- 引用配置好了的数据池,需要c3p0的对应jar -->     <property name="dataSource" ref="dataSource"></property>     <!-- hibernate的属性配置 START: -->     <property name="hibernateProperties">        <props>         <prop key="dialect">org.hibernate.dialect.MySQL5Dialect</prop>         <prop key="show_sql">true</prop>         <prop key="hbm2ddl.auto">update</prop>       </props>     </property>     <!-- hibernate的属性配置 END: -->     <!-- hibernate需要做持久化的映射文件 START: -->     <property name="mappingLocations">       <list>         <value>classpath:com/mz/entity/*.hbm.</value>       </list>     </property>     <!-- hibernate需要做持久化的映射文件 END: -->   </bean>      <!-- 配置sessionFactory的事务管理器 -->   <bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">     <property name="sessionFactory" ref="sessionFactory"></property>   </bean>   <!-- 配置事务 -->    <tx:advice id="txAdvice" transaction-manager="txManager">      <tx:attributes>        <tx:method name="*save*" read-only="false"/>        <tx:method name="*get*" read-only="true"></tx:method>      </tx:attributes>    </tx:advice>      <!-- 配置事务aop -->   <aop:config>     <aop:pointcut expression="execution(* com.mz.service.*.*(..))" id="pt"></aop:pointcut>     <aop:advisor advice-ref="txAdvice" pointcut-ref="pt"/>   </aop:config> </beans>

 

因为所有的属性都是配置在spring的配置文件中,所以其实不需要hibernate.cfg.

最后就是在web.

struts2:

  <!--struts2配置 START: -->  <filter>    <filter-name>struts2</filter-name>    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  </filter>    <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>  <!-- struts2配置 END: -->

 

spring:

<!-- spring ioc配置 START: -->  <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:bean.</param-value>  </context-param>  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <!-- spring ioc配置 END: -->

 

好了,部署到tomcat开始做测试:

index.jsp中加入:

用户名:${user.username }

url:http:localhost:8080/ssh/user(截图是因为加了sessionInViewFilter,请无视)

相当于我们测试成功了,可是如果我们想要看user对应的部门${user.dept.deptName}),就会报错:

这是因为hibernate的session的懒加载机制导致的,那么我们可以在web.

<!-- 配置spring的opensessioninview START:-->  <filter>    <filter-name>openSessionInViewFilter</filter-name>    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>  </filter>    <filter-mapping>    <filter-name>openSessionInViewFilter</filter-name>    <url-pattern>*.action</url-pattern>  </filter-mapping>  <!-- 配置spring的opensessioninview END:-->

 

 拦截所有的.action访问,再次访问,如图所示:

这次就可以显示了,当然还有其他方法,比如(lazy="false",当然这样子每次都要加载出来,这种多对一的还好,如果是1对多,每次都是默认加载出来,对系统的负担会很大,所以不推荐不推荐不推荐!!!!)

ssh整合基本就是这样的,结束!