初识SSH2联合开发小案例-登录练习

说明：涉及毕业设计，正好在学这方面的内容，打算用SSH2来做，但是所学尚浅，一步一个雷区的趟过；

这是一个小小的练习不能再练习的小案例，整合SSH2（Struts2.3.7+Spring3.1.0+Hibernate4.0）

tomcat 6.0 jar1.6 win7 eclipse 9.0 editplus

以下配置文件为完整配置，没有按案例进展配置，基本上应该能够看懂先后顺序，尤其是后面dao service action编写好后 主要就是对applicationContext.xml和struts.xml的编写

基本顺序：

1添加struts2--->在web.xml添加struts2的filter-->添加spring3-->在web.xml添listener--->添加hibernate-->在web.xml添加hibernate的filter

2编写Spring核心配置文件applicationContext.xml--->在里面配置数据库连接-->配置sessionFactory

3 Spring3.1.0接管hibernate.cfg.xml所以就不用在hibernate.cfg.xml里配了。在applicationContext.xml配置sessionFactory时将domain与表的映射关系配好。

4 生成domain(pojo)类-->编写dao TeacherDao（数据库访问对象）接口-->编写dao.impl  TeacherDaoImpl -->编写service业务层接口-->编写service.impl实现类

TeacherService TeacherServiceImpl-->编写调用业务Action类TeacherAction

5 在applicationContext.xml中配置事务 并且 关联 上面编写的dao service 和 action

6 在struts.xml中配置好action

6 设计页面 

7 测试

项目目录树（里面webroot中的页面是以后要毕业设计扩展的）：

(1)准备好相应jar包

(2)在eclipse9 中建立web project 命名为随意了 我的为dsdemon j2ee开发环境选择6.0的

(3)把jar包扔到lib里

建议大家在项目属性里建立自己的jar包 User Library 把所需的jar都add进去

添加struts spring hibernate能力时，不选择eclipse提供的jar库，用刚才自己建立的，避免jar包因版本问题冲突

(4)配置web.xml 

<?xml version="1.0" encoding="UTF-8"?><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">  <display-name></display-name>  <!-- 配置Struts2过滤器 --><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>  <!-- 配置Spring上下文监听器 --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 配置hibernate --><filter><filter-name>hibernateFilter</filter-name><filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class></filter><filter-mapping><filter-name>hibernateFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>    <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

(5)配置Spring

采用C3P0数据池配置

采用Spring管理事务

采用的是XML注入，Spring将dao service action 互相关联。因为刚接触所以尝试注解方式 注入的时候有困难……

<?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:tx="http://www.springframework.org/schema/tx"       xmlns:aop="http://www.springframework.org/schema/aop"       xsi:schemaLocation="            http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/context         http://www.springframework.org/schema/context/spring-context-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"><context:annotation-config/><!-- 使用c3p0配置数据库连接池 --><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="com.mysql.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/newdsweb"/><property name="user" value="root"/><property name="password" value="root"/><property name="maxPoolSize" value="15"/><property name="minPoolSize" value="1"/>        <property name="initialPoolSize" value="3"/>        <property name="idleConnectionTestPeriod" value="60"/>         <property name="maxIdleTime" value="60"/>            </bean>                        <!--配置sessionFactory -->            <bean id="sessionFactory"  class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="mappingResources"><list><value>com/ds/domain/Teacher.hbm.xml</value></list></property><property name="hibernateProperties"><value>hibernate.dialect=org.hibernate.dialect.MySQL5Dialecthibernate.show_sql=truehibernate.format_sql=true            </value></property></bean><!-- 事务配置 --><bean id="transactionManager"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory" /></bean><!-- 事务通知配置，使用的事务管理器引用到 transactionManager --><tx:advice id="txAdvice" transaction-manager="transactionManager"><tx:attributes><!-- 指定哪些方法需要加入事务，使用通配符来加入需要的方法 --><tx:method name="get*" propagation="REQUIRED" read-only="true" /><tx:method name="add*" propagation="REQUIRED" read-only="true" /><tx:method name="login*" propagation="REQUIRED" read-only="true" /><tx:method name="update*" propagation="REQUIRED" read-only="true" /><tx:method name="delete*" propagation="REQUIRED" read-only="true" /><tx:method name="*" propagation="REQUIRED" read-only="true"/></tx:attributes></tx:advice><!-- 引入aop的命名空间 --><aop:config><!-- 切入点指明在执行service所有方法时的事务拦截操作 --><aop:pointcut id="daoMethods"expression="execution(* com.ds.dao.impl.*.*(..))" /><!-- 定义采用何种拦截操作，引用到 txAdvice --><aop:advisor advice-ref="txAdvice" pointcut-ref="daoMethods" /></aop:config><bean id="teacherDao" class="com.ds.dao.impl.TeacherDaoImpl"><property name="sessionFactory" ref="sessionFactory"></property></bean><bean id="teacherService" class="com.ds.service.impl.TeacherServiceImpl"><property name="teDao" ref="teacherDao"></property></bean><bean id="teacherAction" class="com.ds.action.TeacherAction"><property name="teacherService" ref="teacherService"></property></bean></beans>

(6)利用hibernate反向工程生成domain 

这里是com.ds.domain.Teacher,自动生成映射文件Teacher.hbm.xml

(7)编写dao 接口和dao实现类

这里对数据库的操作用sessionFactory和Query 并不用hibernate的模板

代码如下

TeacherDao

package com.ds.dao;import java.util.List;import com.ds.domain.Teacher;public interface TeacherDao {public Teacher login(Teacher teacher);public List findByExample(Teacher teacher);public void add(Teacher teacher);public void update(Teacher teacher);public void delete(int id);List<Teacher> getTeacher();}

TeacherDaoImpl(我这里掺杂了注解内容，是因为刚开始直接尝试用注解，把注解取消掉即可 不影响)

package com.ds.dao.impl;import java.util.List;import javax.annotation.Resource;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.springframework.stereotype.Repository;import org.springframework.transaction.annotation.Transactional;import com.ds.dao.TeacherDao;import com.ds.domain.Teacher;@Repository@Transactionalpublic class TeacherDaoImpl implements TeacherDao {@Resourceprivate SessionFactory sessionFactory;private Session session;public void setSessionFactory(SessionFactory sessionFactory) {this.sessionFactory = sessionFactory;}public SessionFactory getSessionFactory() {return sessionFactory;}public Session getSession() {session = this.sessionFactory.getCurrentSession();return session;}@SuppressWarnings("unchecked")@Overridepublic Teacher login(Teacher teacher) {String hql = "from Teacher where teid='"+teacher.getTeid()+"' and pwd='"+teacher.getPwd()+"'";String hql2 = "from Teacher where teid='40701' and pwd='123456'";session = this.getSession();List<Teacher> list = session.createQuery(hql).list();if(list.size()==1){teacher = list.get(0);}else{teacher = null;}return teacher;}@Overridepublic void add(Teacher teacher) {// TODO Auto-generated method stub}@Overridepublic void update(Teacher teacher) {// TODO Auto-generated method stub}@Overridepublic void delete(int id) {// TODO Auto-generated method stub}@Overridepublic List<Teacher> getTeacher() {// TODO Auto-generated method stubreturn null;}@Overridepublic List findByExample(Teacher teacher) {return sessionFactory.getCurrentSession().createQuery("from Teacher").list();}}

(8)编写service和serviceImpl

package com.ds.service;import com.ds.domain.Teacher;public interface TeacherService {public boolean findlogin(Teacher teacher);}

package com.ds.service.impl;import com.ds.dao.TeacherDao;import com.ds.domain.Teacher;import com.ds.service.TeacherService;public class TeacherServiceImpl implements TeacherService {private TeacherDao teDao;public void setTeDao(TeacherDao teDao) {this.teDao = teDao;}public TeacherDao getTeDao() {return teDao;}@Overridepublic boolean findlogin(Teacher teacher) {if(teDao.login(teacher)!=null){return true;}return false;}}

(9)编写action并配置struts.xml

package com.ds.action;import com.ds.domain.Teacher;import com.ds.service.TeacherService;import com.opensymphony.xwork2.ActionSupport;public class TeacherAction extends ActionSupport{private static final long serialVersionUID = 1L;private TeacherService teacherService;private Teacher teacher;public String login(){if(teacherService.findlogin(teacher)){return "success";}else{return "error";}}public void setTeacherService(TeacherService teacherService) {this.teacherService = teacherService;}public TeacherService getTeacherService() {return teacherService;}public Teacher getTeacher(){return teacher;}public void setTeacher(Teacher teacher){this.teacher = teacher;}}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd"><struts><!-- 定义请求后缀 --><constant name="struts.action.extension" value="do,action" /><!-- 启用动态调用方法 --><constant name="struts.enable.DynamicMethodInvocation" value="true" /><!--启用错误信息调试模式。显示更详细的错误信息 --><constant name="struts.devMode" value="false" /><package name="teacherLogin" namespace="/" extends="struts-default"><action name="TeacherAction" class="teacherAction" method="login"> <result name="success">/success.jsp</result><result name="error">/error.jsp</result></action></package></struts>

(10)页面，使用struts标签<%@ taglib prefix="s“ uri="/struts-tag" %>

<s:form action="TeacherAction" namespace="/"><s:textfield name="teacher.teid" label="用户名"></s:textfield><s:password name="teacher.pwd" label="密码"></s:password><s:submit value="确定"/><s:reset value="重置"/></s:form>

service方法中对dao接口对象的getter 和 setter方法 不要丢

action中domain对象的名称使用一致Teacher teacher，使用Teacher te则出错
action的命名空间要通页面的提交给哪个action的命名空间一致

sessionFactory 的setter getter方法 缺失会导致获取session null值的情况