Java进阶知识26 SSH整合（Struts2、Spring、Hibernate）

1、我用到的jar包

　　　　

2、整合实例

2.1、MySQL数据库建表语句

 create database school; -- 创建数据库
 use school; -- 使用school数据库
 4 create table user( -- 创建user表
   id int(4) primary key auto_increment,
   name varchar(20) not null,
   age int(4) not null
 );
 inert into user(name,age) values("张三",);

2.2、配置web.xml文件

 <?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_3_0.xsd" version="3.0">
   <display-name></display-name>
   <welcome-file-list>
     <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>

   <!-- Spring监听器 -->
   <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>/WEB-INF/classes/beans_*.xml</param-value>
     </context-param>
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>

     <!-- 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>
 </web-app>

2.3、创建实体类（User）

 package com.shore.entity;

 /**
  * @author DSHORE/2019-11-12
  *
  */
 public class User {
     private Integer id;
     private String name;
     private Integer age;

     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }

     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }

     public Integer getAge() {
         return age;
     }
     public void setAge(Integer age) {
         this.age = age;
     }
 }

2.4、配置实体类User的hibernate文件（User.hbm.xml）

 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE hibernate-mapping PUBLIC
         "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
         "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

 <hibernate-mapping package="com.shore.entity">
     <class name="User">
         <id name="id">
             <generator class="native"/>
         </id>
         <property name="name" type="java.lang.String"/>
         <property name="age" type="java.lang.Integer"/>
     </class>
 </hibernate-mapping>

2.5、创建dao层IUserDao接口类以及UserDao接口实现类

 //接口类
 public interface IUserDao {
     public User getByName(String name);//根据用户名查询
 }

 //对应的接口实现类
 public class UserDao implements IUserDao {
     //从IoC容器注入SessionFactory
     private SessionFactory sessionFactory;
     public void setSessionFactory(SessionFactory sessionFactory) {
         this.sessionFactory = sessionFactory;
     }

     @Override  //根据用户名查询
     public User getByName(String name) {
         Query query = sessionFactory.getCurrentSession().createQuery("from User where name=:name");  //:name是命名参数
         query.setParameter("name", name);
         @SuppressWarnings("unchecked")
         List<User> users = query.list();
         if (users != null && users.size() > 0) {
             return users.get(0);
         }
         return null;
     }
 }

2.6、创建service层IUserService接口类以及UserService接口实现类

 //接口类
 public interface IUserService {
     public User getByName(String name);
 }

 //对应的接口实现类
 public class UserService implements IUserService {

     private IUserDao userDao;
     public void setUserDao(IUserDao userDao) {
         this.userDao = userDao;
     }

     @Override
     public User getByName(String name) {
         return userDao.getByName(name);
     }
 }

2.7、创建UserAction

 package com.shore.action;

 import com.opensymphony.xwork2.ActionSupport;
 import com.shore.service.IUserService;

 /**
  * @author DSHORE/2019-11-16
  *
  */
 public class UserAction extends ActionSupport{
     private static final long serialVersionUID = -3099218232367860074L;

     private IUserService userService;

     public String login() {
         System.out.println(userService.getByName("张三"));
         return SUCCESS;
     }

     public void setUserService(IUserService userService) {
         this.userService = userService;
     }
 }

2.8、配置Spring文件（beans_common.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:aop="http://www.springframework.org/schema/aop"
     xmlns:tx="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/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

     <!-- c3p0数据库连接池配置 -->
     <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/school"></property>
         <property name="user" value="root"></property>
         <property name="password" value="root"></property>
         <property name="initialPoolSize" value="3"></property>
         <property name="maxPoolSize" value="100"></property>
         <property name="maxStatements" value="200"></property>
         <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->
         <property name="acquireIncrement" value="2"></property>
     </bean>

     <!-- Hibernate核心配置文件（hibernate.cfg.xml）全交给Spring去管理 -->
     <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
         <!-- c3p0的数据库连接池 -->
         <property name="dataSource" ref="dataSource"></property>
         <!-- Hibernate基础参数配置 -->
         <property name="hibernateProperties">
             <props>  <!-- 注意：这个是Spring配置文件，故下面的key要写全名，即：前面加上hibernate.xxxxxx -->
                 <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                 <prop key="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</prop>
                 <prop key="hibernate.show_sql">true</prop>
                 <prop key="hibernate.format_sql">true</prop>
                 <prop key="hibernate.hbm2ddl.auto">update</prop>
             </props>
         </property>
         <!-- Hibernate 映射文件的配置 -->
         <property name="mappingLocations">
             <list>
                 <value>classpath:com/shore/entity/*.hbm.xml</value>
             </list>
         </property>
     </bean>

     <!-- dao层 -->
     <bean id="userDao" class="com.shore.dao.impl.UserDao">
         <property name="sessionFactory" ref="sessionFactory"></property>
     </bean>

     <!-- service层 -->
     <bean id="userService" class="com.shore.service.impl.UserService">
         <property name="userDao" ref="userDao"></property>
     </bean>

     <!-- action层 -->
     <bean id="userAction" class="com.shore.action.UserAction" scope="prototype">
         <property name="userService" ref="userService"></property>
     </bean>

     <!-- ############Spring声明式事务管理配置########### -->
     <!-- 配置事务管理器 -->
     <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
         <property name="sessionFactory" ref="sessionFactory"></property>
     </bean>

     <!-- 配置事务增强(针对DAO层) -->
     <tx:advice transaction-manager="transactionManager" id="transactionAdvice">
         <tx:attributes>  <!-- *代表DAO层的所有方法 -->
             <tx:method name="*" read-only="false"/>
         </tx:attributes>
     </tx:advice>

     <!-- AOP配置:配置切入点表达式 -->
     <aop:config>    <!-- 第一个*表示返回值类型；第二个*表示service层下的所有接口实现类；第三个*表示每个接口实现类下的所有方法 -->
         <aop:pointcut expression="execution(* com.shore.service.impl.*.*(..))" id="pt"/>
         <aop:advisor advice-ref="transactionAdvice" pointcut-ref="pt"/>
     </aop:config>
 </beans>

2.9、配置Struts2 文件（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>
     <!-- true支持动态方法调用 -->
     <constant name="struts.enable.DynamicMethodInvocation" value="true" />
     <constant name="struts.devMode" value="true" /> <!-- true -->

     <package name="user" namespace="/user" extends="struts-default">
         <action name="userAction" class="com.shore.action.UserAction">
             <result name="success">/success.jsp</result>
         </action>
     </package>
 </struts>

测试结果图：

　　

总结：

1、与传统方式相比，SSH框架 代码层（dao层、service层 等）耦合度较低，方便后期维护。

2、entity、dao、service、action层、以及db层（连接数据库）都交给spring IOC容器来管理，大大降低各层之间的耦合度，极大方便该项目后期的维护。

3、Hibernate或Spring IOC容器管理project与DB之间的连接；Spring IOC容器管理dao层（及BaseDao）、service层、action层；Struts2管理action层与前端页面的数据交互。

原创作者：DSHORE

作者主页：http://www.cnblogs.com/dshore123/

原文出自：https://www.cnblogs.com/dshore123/p/11874947.html

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