SSH 框架搭建与开发

对于Java初学者而言，SSH框架还是比较复杂的，今天借用一个Web注册功能的案例给大家讲解下，主要是讲下开发模式与注意事项！

注册界面如下所示：

1.首先建库建表（我用的是Mysql数据库，大家可以参考其他关系型DB，在SSH框架中集成对应驱动访问即可）

/*在Mysql的test库中执行如下创建表SQL语句*/SET FOREIGN_KEY_CHECKS=0;-- ------------------------------ Table structure for user-- ----------------------------DROP TABLE IF EXISTS `user`;CREATE TABLE `user` (  `id` int(10) NOT NULL AUTO_INCREMENT,  `name` varchar(16) NOT NULL,  `password` varchar(16) NOT NULL,  `sex` int(1) NOT NULL,  PRIMARY KEY (`id`)) ENGINE=MyISAM AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;

2.创建Dynamic Web Project（我用的是Eclipse J2EE版本，大家也可以使用MyEclipse Java IDE开发环境）

3.将SSH框架中lib库及DB、日志相关库（jar包）拷贝至工程中lib目录
（我这里使用的Struts2 + Spring3 + Hibernate3集成框架）
备注：无需在Libraries中Add新增lib库，工程会自动加载

4.将struts.xml拷贝至src目录下（对应在classes目录也会生成该文件），将applicationContext.xml及web.xml拷贝至WEB-INF目录下
备注：这里路径很容易弄错，需要注意，因为排查起来比较麻烦

5.对工程结构分层：持久层 <- DAO层 <- 业务层 <- Web层（展现层），如下所示：

6.接下来就是逐层实现代码的过程（时间关系，直接上代码与注释吧）：

（1）持久层

User.java

package hexieshangwang.ssh.beans;/**  * @author：hexieshangwang  * @version 1.0 * @parameter * @since * @return * @description：在持久层建立po与hbm.xml映射关系*/public class User {    private int id;    private String name;    private String password;    private int sex;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public int getSex() {        return sex;    }    public void setSex(int sex) {        this.sex = sex;    }}

User.hbm.xml

<?xml version="1.0" encoding='UTF-8'?><!DOCTYPE hibernate-mapping PUBLIC                            "-//Hibernate/Hibernate Mapping DTD 3.0//EN"                            "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" ><hibernate-mapping package="hexieshangwang.ssh.beans">    <class name="User" table="user">        <id name="id" column="id">            <generator class="native"></generator>        </id>        <property name="name" column="name" type="java.lang.String"            not-null="true" length="16"></property>        <property name="password" column="password" type="java.lang.String"            not-null="true" length="16" />        <property name="sex" column="sex" type="java.lang.Integer"            length="1" />    </class></hibernate-mapping>

（2）DAO层

BaseDao.java

package hexieshangwang.ssh.dao;import org.hibernate.HibernateException;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：在DAO层提供访问持久层（Hibernate）接口*/public interface BaseDao {    public void saveObject(Object obj) throws HibernateException;}

UserDao.java

package hexieshangwang.ssh.daoImpl;import org.hibernate.HibernateException;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;import hexieshangwang.ssh.dao.BaseDao;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：实现DAO层接口*/public class UserDao extends HibernateDaoSupport implements BaseDao{    @Override    public void saveObject(Object obj) throws HibernateException {        // TODO Auto-generated method stub        getHibernateTemplate().save(obj);    }}

（3）业务层

UserService.java

package hexieshangwang.ssh.service;import org.hibernate.HibernateException;import hexieshangwang.ssh.forms.UserForm;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：在业务层提供访问DAO层Service接口*/public interface UserService {    public void regUser(UserForm user) throws HibernateException;}

UserServiceImpl.java

package hexieshangwang.ssh.serviceImpl;import org.hibernate.HibernateException;import org.springframework.beans.BeanUtils;import hexieshangwang.ssh.beans.User;import hexieshangwang.ssh.dao.BaseDao;import hexieshangwang.ssh.forms.UserForm;import hexieshangwang.ssh.service.UserService;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：实现业务层Service接口*/public class UserServiceImpl implements UserService{    private BaseDao dao;    public void setDao(BaseDao dao) {        this.dao = dao;    }    @Override    public void regUser(UserForm userForm) throws HibernateException {        // TODO Auto-generated method stub        User user = new User();        BeanUtils.copyProperties(userForm, user);        dao.saveObject(user);    }}

applicationContext.xml
备注：此处在Spring框架中整合了Hibernate配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><!-- 定义数据源的信息 --><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://IP:3306/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><!--定义Hibernate的SessionFactory --><!-- SessionFactory使用的数据源为上面的数据源 --><!-- 指定了Hibernate的映射文件和配置信息 --><bean id="sessionFactory"class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"><property name="dataSource"><ref local="dataSource" /></property><property name="mappingResources"><list><value>hexieshangwang/ssh/beans/User.hbm.xml</value></list></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><bean id="transactionManager"class="org.springframework.orm.hibernate3.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactory" /></bean><bean id="baseDao" class="hexieshangwang.ssh.daoImpl.UserDao"><property name="sessionFactory"><ref bean="sessionFactory" /></property></bean><!--用户注册业务逻辑类 --><bean id="userService" class="hexieshangwang.ssh.serviceImpl.UserServiceImpl"><property name="dao"><ref bean="baseDao" /></property></bean><!-- 用户注册的Action --><bean id="regAction" class="hexieshangwang.ssh.action.RegisterAction"><property name="userService"><ref bean="userService" /></property></bean><!-- more bean definitions go here --></beans>

（4）Web层

UserForm.java

package hexieshangwang.ssh.forms;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：在Web层实现表单Form*/public class UserForm {    private String name;    private String password;    private int sex;    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public int getSex() {        return sex;    }    public void setSex(int sex) {        this.sex = sex;    }}

RegisterAction.java

package hexieshangwang.ssh.action;import com.opensymphony.xwork2.ActionSupport;import hexieshangwang.ssh.forms.UserForm;import hexieshangwang.ssh.service.UserService;/**   * @author：hexieshangwang   * @version 1.0  * @parameter  * @since  * @return  * @description：在Web层实现Action界面操作*/public class RegisterAction extends ActionSupport {    private static final long serialVersionUID = 1L;    private UserForm user;    private UserService userService;    public UserForm getUser() {        return user;    }    public void setUser(UserForm user) {        this.user = user;    }    public void setUserService(UserService userService) {        this.userService = userService;    }    public String execute() {        try {            userService.regUser(user);            return SUCCESS;        } catch (Exception e) {            e.printStackTrace();            return ERROR;        }    }}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <include file="struts-default.xml" />    <package name="hexieshangwang" extends="struts-default">        <action name="register" class="regAction">            <result name="submit">/Register.jsp</result>            <result name="success">/Success.jsp</result>            <result name="error">/Fail.jsp</result>        </action>    </package></struts>