【示例】SSH整合小例子

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此例子来自于《轻量级JavaEE企业应用开发》（李刚著）

本例子实现了Spring来整合Struts和Hibernate，这是一个添加书本功能的小示例
首先实体类Book

package com.domain;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.Table;@Entity@Table(name="my_books")public class Book {    @Id    @GeneratedValue(strategy=GenerationType.IDENTITY)    @Column(name="id")    private Integer id;    @Column(name="title")    private String title;    @Column(name="author")    private String author;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getAuthor() {        return author;    }    public void setAuthor(String author) {        this.author = author;    }}

基本DAO接口，如果还有其他的DAO可以实现这个接口

package com.dao;import java.io.Serializable;import java.util.List;public interface BaseDao<T> {    //根据ID加载实体    T get(Class<T> entityClazz, Serializable id);    //保存实体    Serializable save(T entity);    //更新实体    void update(T entity);    //删除    void delete(T entity);    //根据ID删除实体    void delete(Class<T> entityClazz, Serializable id);    //获取所有实体     List<T> findAll(Class<T> entityClass);    //获取实体总数    long findCount(Class<T> entityClazz);}

BookDao接口

package com.dao;import com.domain.Book;public interface BookDao extends BaseDao<Book> {    //这里没有内容是因为不需要增加什么方法了}

Hbiernate4的基本Dao的实现类

package com.dao.impl;import java.io.Serializable;import java.util.List;import org.hibernate.Query;import org.hibernate.SessionFactory;import com.dao.BaseDao;public class BaseDaoHibernate4<T> implements BaseDao<T> {    private SessionFactory sessionFactory;    public SessionFactory getSessionFactory() {        return sessionFactory;    }    public void setSessionFactory(SessionFactory sessionFactory) {        this.sessionFactory = sessionFactory;    }    @SuppressWarnings("unchecked")    @Override    public T get(Class<T> entityClazz, Serializable id) {        // TODO Auto-generated method stub        return (T)getSessionFactory().getCurrentSession().get(entityClazz, id);    }    @Override    public Serializable save(T entity) {        // TODO Auto-generated method stub        return getSessionFactory().getCurrentSession().save(entity);    }    @Override    public void update(T entity) {        // TODO Auto-generated method stub        getSessionFactory().getCurrentSession().saveOrUpdate(entity);    }    @Override    public void delete(T entity) {        // TODO Auto-generated method stub        getSessionFactory().getCurrentSession().delete(entity);    }    @Override    public void delete(Class<T> entityClazz, Serializable id) {        // TODO Auto-generated method stub        getSessionFactory().getCurrentSession().            createQuery("delete " + entityClazz.getSimpleName() +             "en where en.id = ?0").setParameter("0", id).executeUpdate();    }    @Override    public List<T> findAll(Class<T> entityClass) {        // TODO Auto-generated method stub        String sql = "select en from " + entityClass.getSimpleName() + " en";        return find(sql);    }    @Override    public long findCount(Class<T> entityClazz) {        // TODO Auto-generated method stub        List<?> list = find("select count(*) from " + entityClazz.getSimpleName());        if(list != null && list.size() == 1) {            return (long) list.get(0);        }        return 0;    }    @SuppressWarnings("unchecked")    protected List<T> find(String hql) {        return getSessionFactory().                getCurrentSession().createQuery(hql).list();    }    /**     * 根据带占位符参数的HQL语句查询实体     * @param hql     * @param params     * @return     */    @SuppressWarnings("unchecked")    protected List<T> find(String hql, Object... params) {        Query query = getSessionFactory().                getCurrentSession().createQuery(hql);        for(int i = 0; i < params.length; i++) {            query.setParameter(i + "", params[i]);        }        return query.list();    }    /**     * 分页查询     * @param hql     * @param pageNo查询第几页的记录     * @param pageSize一页多少行     * @return     */    @SuppressWarnings("unchecked")    protected List<T> findByPage(String hql, int pageNo, int pageSize) {        return getSessionFactory().getCurrentSession()                .createQuery(hql).setFirstResult((pageNo-1)*pageSize)                .setMaxResults(pageSize).list();    }    protected List<T> findByPage(String hql, int pageNo, int pageSize, Object... params) {        Query query = getSessionFactory().getCurrentSession()                .createQuery(hql).setFirstResult((pageNo-1)*pageSize)                .setMaxResults(pageSize);        for(int i = 0; i < params.length; i++) {            query.setParameter(i+"", params[i]);        }        return query.list();    }}

BookDao实现类

package com.dao.impl;import com.dao.BookDao;import com.domain.Book;public class BookDaoHibernate4 extends BaseDaoHibernate4<Book> implements BookDao {    //这里也没有内容是因为不需要添加什么方法}

BookService接口

package com.service;import com.domain.Book;public interface BookService {    //添加图书    int addBook(Book book);}

BookService实现类

package com.service.impl;import com.dao.BookDao;import com.domain.Book;import com.service.BookService;public class BookServiceImpl implements BookService {    private BookDao bookDao;    public void setBookDao(BookDao bookDao) {        this.bookDao = bookDao;    }    @Override    public int addBook(Book book) {        // TODO Auto-generated method stub        return (int) bookDao.save(book);    }}

Action类

package com.action;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.context.support.FileSystemXmlApplicationContext;import com.domain.Book;import com.opensymphony.xwork2.ActionSupport;import com.service.BookService;import com.service.impl.BookServiceImpl;public class BookAction extends ActionSupport {    private BookService bookService;    public void setBookService(BookService bookService) {        this.bookService = bookService;    }    private Book book;    public Book getBook() {        return book;    }    public void setBook(Book book) {        this.book = book;    }    public String add() throws Exception {        int result = bookService.addBook(book);        if(result > 0) {            addActionMessage("图书添加成功");            return SUCCESS;        }        addActionMessage("图书添加失败");        return ERROR;    }    @Override    public String execute() throws Exception {        // TODO Auto-generated method stub        System.out.println("默认的BookAction");        return super.execute();    }}

struts.xml文件，在src文件夹下

<?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>    <constant name="struts.devMode" value="true"/>    <constant name="struts.enable.DynamicMethodInvocation" value="false"/>    <package name="default" namespace="/" extends="struts-default">        <!-- 此处的class是指applicationContext.xml配置的bean的id -->        <action name="createBook" class="bookAction" method="add">            <result name="success">success.jsp</result>            <result name="error">error.jsp</result>        </action>        <action name="*">            <result>{1}.jsp</result>        </action>    </package></struts>

web.xml，在WEB-INF文件夹下

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">  <display-name>TestSSH</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>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>  <!-- 使用ContextLoaderListener让Web容器启动的时候自动装配ApplicationContext的配置信息 -->  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <!-- 指定application.xml问文件路径 -->  <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>/WEB-INF/applicationContext.xml</param-value>  </context-param>  <!-- 配置Struts -->  <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>

applicationContext.xml在WEB-INF文件夹下

<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://www.springframework.org/schema/beans"    xmlns:p="http://www.springframework.org/schema/p"    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-4.0.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-4.0.xsd    http://www.springframework.org/schema/tx    http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">    <!-- 数据库相关配置 -->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"        destroy-method="close"        p:driverClass="com.mysql.jdbc.Driver"        p:user="root"        p:password="abc123"        p:jdbcUrl="jdbc:mysql://localhost/spring"        p:maxPoolSize="40"        p:minPoolSize="2"        p:initialPoolSize="2"        p:maxIdleTime="30"    />    <!-- 定义Hibernate的SessionFactory，将数据源dataSource注入 -->    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"        p:dataSource-ref="dataSource">        <!-- 实体类列表 -->        <property name="annotatedClasses">            <list>                <value>com.domain.Book</value>            </list>        </property>        <!-- Hibernate相关参数 -->        <property name="hibernateProperties">            <props>                <!-- 数据库方言 -->                <prop key="hibernate.dialect">                    org.hibernate.dialect.MySQL5InnoDBDialect                </prop>                <!-- 设置成update会更新原来的数据，还有一种是create，每次创建数据都会删除掉原来的数据 -->                <prop key="hibernate.hbm2ddl.auto">update</prop>                <!-- 显示SQL语句 -->                <prop key="hibernate.show_sql">true</prop>                <!-- 格式化SQL语句 -->                <prop key="hibernate.format_sql">true</prop>            </props>        </property>    </bean>    <!-- 配置一个bookService的bean，用来写对相关数据逻辑 -->    <bean id="bookService" class="com.service.impl.BookServiceImpl" p:bookDao-ref="bookDao"/>    <!-- 基本的数据库处理DAO类，提供CRUD等方法 -->    <bean id="bookDao" class="com.dao.impl.BookDaoHibernate4" p:sessionFactory-ref="sessionFactory"/>    <!-- 定义事物管理器，以便支持各种数据访问框架的事物管理，本例子中使用的是Hibernate -->    <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"        p:sessionFactory-ref="sessionFactory"/>    <!-- 配置Action类，在struts.xml中可以使用这个bean的id来跳转到指定的class中 -->    <!-- 因为Action里包含了请求的状态信息，必须为每一个请求对应Action -->    <bean id="bookAction" class="com.action.BookAction" p:bookService-ref="bookService" scope="prototype"/>    <!-- 配置事物增强管理器 -->    <tx:advice id="txAdvice" transaction-manager="transactionManager">        <tx:attributes>            <!-- 所有以get开头的方设为只读 -->            <tx:method name="get*" read-only="true"/>            <!-- 所有方法事物隔离级别为默认，事物的传播行为为REQUIRED，超时时间为5秒 -->            <tx:method name="*" isolation="DEFAULT" propagation="REQUIRED" timeout="5"/>        </tx:attributes>    </tx:advice>    <aop:config>        <!-- 注解使用bean(bookService)是指专门对bookService这个bean起作用 -->        <!-- <aop:pointcut expression="bean(bookService)" id="myPointcut"/> -->        <!-- 对所有类型的返回值，在com.service.impl包下的所有类的所有方法 -->        <aop:pointcut expression="execution(* com.service.impl.*.*(..))" id="myPointcut"/>        <aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut"/>    </aop:config></beans>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>添加图书</title></head><body><s:form action="createBook">    <s:textfield name="book.title" label="书名"/>    <s:textfield name="book.author" label="作者"/>    <s:submit value="提交"/></s:form></body></html>

之后还要写success.jsp和error.jsp，用来标明是否插入成功了
做好了之后的项目文件结构是这样的

值得注意的是struts.xml的class要用bean的id还有在web.xml中指定applicationContext.xml文件的路径才可以正确将action从struts中转到spring

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