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使用Spring+Spring MVC+Hibernate做增删改查开发效率真的很高。使用Hibernate简化了JDBC连接数据库的的重复性代码。下面根据自己做的一个简单的增加和查询，把一些难点分析出来：
首先项目目录结构：（Hibernate持久化数据连接信息交给Spring进行管理；别忘了加入Hibernate和Spring相关的架包.jar）
第一步：弄个用户实体类（配置Users.hbm.xml映射文件）：
1 package com.ssh.SpringMVC.enity; 2 3 4 5 public class Users { 6 7 private int id;//id 8 private String username;//用户名 9 private String password;//密码 10 private String sex;//性别 11 /** 12 * @return the id 13 */ 14 public int getId() { 15 return id; 16 } 17 /** 18 * @param id the id to set 19 */ 20 public void setId(int id) { 21 this.id = id; 22 } 23 /** 24 * @return the username 25 */ 26 public String getUsername() { 27 return username; 28 } 29 /** 30 * @param username the username to set 31 */ 32 public void setUsername(String username) { 33 this.username = username; 34 } 35 /** 36 * @return the password 37 */ 38 public String getPassword() { 39 return password; 40 } 41 /** 42 * @param password the password to set 43 */ 44 public void setPassword(String password) { 45 this.password = password; 46 } 47 /** 48 * @return the sex 49 */ 50 public String getSex() { 51 return sex; 52 } 53 /** 54 * @param sex the sex to set 55 */ 56 public void setSex(String sex) { 57 this.sex = sex; 58 } 59 60 }
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> 5 6 7 <hibernate-mapping 8 package="com.ssh.SpringMVC.enity"> 9 10 <class name="Users" table="t_users"> 11 <id name="id"> 12 <generator class="increment"/> 13 </id> 14 <property name="username" /> 15 <property name="password"/> 16 <property name="sex"/> 17 </class> 18 19 20 </hibernate-mapping>
第二步：建个Dao层（公共类）
1 package com.ssh.SpringMVC.Dao; 2 3 import java.util.List; 4 5 /* 6 * 公共类 7 */ 8 public interface IBaseDao<T> { 9 //保存对象 10 public void save(T t); 11 //删除对象 12 public void delete(int id); 13 //更新对象 14 public void update(T t); 15 //根据id查询对象 16 public T getObjectByid(int id); 17 //查询所有对象 18 public List<T> getObjectALL(); 19 //根据一组id查询一组对象 20 public List<T> getObjectByids(int ids); 21 22 }
1 package com.ssh.SpringMVC.Dao.Impl; 2 3 import java.lang.reflect.ParameterizedType; 4 import java.util.List; 5 6 import javax.annotation.Resource; 7 8 import org.hibernate.SessionFactory; 9 10 import org.springframework.transaction.annotation.Transactional; 11 12 import com.ssh.SpringMVC.Dao.IBaseDao; 13 14 /* 15 * 公共方法实现类 16 */ 17 @SuppressWarnings("unchecked") 18 @Transactional 19 public class IBaseDaoImpl<T> implements IBaseDao<T>{ 20 21 //注入sessionfactory 22 @Resource 23 SessionFactory sessionFactory; 24 Class clazz; 25 26 27 //构造方法：获取T的真实类型 28 public IBaseDaoImpl(){ 29 ParameterizedType pType=(ParameterizedType) this.getClass().getGenericSuperclass(); 30 clazz=(Class) pType.getActualTypeArguments()[0]; 31 System.out.print(clazz.getSimpleName()); 32 33 } 34 /* 35 * 删除对象 36 * (non-Javadoc) 37 * @see com.ssh.SpringMVC.Dao.IBaseDao#delete(int) 38 */ 39 public void delete(int id) { 40 // TODO Auto-generated method stub 41 sessionFactory.getCurrentSession().delete( 42 sessionFactory.getCurrentSession().get(clazz, id)); 43 } 44 45 /* 46 * 查询所有对象 47 * (non-Javadoc) 48 * @see com.ssh.SpringMVC.Dao.IBaseDao#getObjectALL() 49 */ 50 51 public List<T> getObjectALL() { 52 // System.out.println("=====："+"from"+clazz.getSimpleName()); 53 // System.out.println("=====："+"from "+clazz.getSimpleName()); 54 // System.out.println("--------------"+clazz.getSimpleName()); 55 return sessionFactory.getCurrentSession().createQuery("from "+clazz.getSimpleName()).list(); 56 } 57 /* 58 * 根据id获取对象 59 * (non-Javadoc) 60 * @see com.ssh.SpringMVC.Dao.IBaseDao#getObjectByid(int) 61 */ 62 public T getObjectByid(int id) { 63 // TODO Auto-generated method stub 64 return (T) sessionFactory.getCurrentSession().get(clazz, id); 65 } 66 67 68 /* 69 * 根据一组id获取一组对象 70 * (non-Javadoc) 71 * @see com.ssh.SpringMVC.Dao.IBaseDao#getObjectByids(int) 72 */ 73 public List<T> getObjectByids(int ids) { 74 // TODO Auto-generated method stub 75 return sessionFactory.getCurrentSession().createQuery( 76 "from"+clazz.getSimpleName()+"where id in(:ids)").setParameter("ids", ids).list(); 77 } 78 /* 79 * 保存对象 80 * (non-Javadoc) 81 * @see com.ssh.SpringMVC.Dao.IBaseDao#save(java.lang.Object) 82 */ 83 public void save(T t) { 84 // TODO Auto-generated method stub 85 sessionFactory.getCurrentSession().save(t); 86 } 87 88 public void update(T t) { 89 // TODO Auto-generated method stub 90 sessionFactory.getCurrentSession().update(t); 91 } 92 93 }
第三步：Servse用户逻辑层
1 package com.ssh.SpringMVC.Servse; 2 3 import com.ssh.SpringMVC.Dao.IBaseDao; 4 import com.ssh.SpringMVC.enity.Users; 5 6 /* 7 * 用户逻辑层 8 */ 9 10 public interface IUserService extends IBaseDao<Users>{ 11 //定义特有方法。。。 12 }
1 package com.ssh.SpringMVC.Servse.Impl; 2 3 import org.springframework.stereotype.Service; 4 5 import com.ssh.SpringMVC.Dao.Impl.IBaseDaoImpl; 6 import com.ssh.SpringMVC.Servse.IUserService; 7 import com.ssh.SpringMVC.enity.Users; 8 /* 9 * 用户实现类 10 * 11 */ 12 @Service("userService") 13 public class IUserServiceImpl extends IBaseDaoImpl<Users> implements IUserService{ 14 15 }
第四步：配置applicationContext.xml和springmvc.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:context="http://www.springframework.org/schema/context" 4 xmlns:tx="http://www.springframework.org/schema/tx" 5 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 6 xsi:schemaLocation="http://www.springframework.org/schema/beans 7 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 8 http://www.springframework.org/schema/context 9 http://www.springframework.org/schema/context/spring-context-2.5.xsd 10 http://www.springframework.org/schema/tx 11 http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> 12 13 14 15 <!-- 引入外部配置文件 --> 16 <context:property-placeholder location="classpath:oracle.properties" /> 17 18 <!-- 配置数据源(将所有的配置写在Spirng中) --> 19 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"> 20 21 <!-- 数据库连接信息 --> 22 <property name="url" value="${url}" /> 23 <property name="username" value="${username}" /> 24 <property name="password" value="${password}" /> 25 <property name="driverClassName" value="${driverClassName}" /> 26 27 <!-- 最大连接数 --> 28 <property name="maxActive" value="${maxActive}" /> 29 <!-- 最大空闲数 --> 30 <property name="maxIdle" value="${maxIdle}" /> 31 <!--最小空闲数--> 32 <property name="minIdle" value="${minIdle}" /> 33 <!-- 初始连接数 --> 34 <property name="initialSize" value="${initialSize}" /> 35 36 </bean> 37 38 <!-- 创建sessionFactory --> 39 <bean id="sessionFactory" 40 class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"> 41 <property name="dataSource" ref="dataSource" /> 42 43 44 <!-- 配置Hibernate配置信息 --> 45 <property name="hibernateProperties"> 46 <props> 47 <prop key="hibernate.show_sql">true</prop> 48 <prop key="hibernate.hbm2ddl.auto">update</prop> 49 <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop> 50 </props> 51 </property> 52 53 <!-- 配置实体类映射信息 --> 54 <property name="mappingResources"> 55 <list> 56 57 <value>com/ssh/SpringMVC/enity/Users.hbm.xml</value> 58 59 </list> 60 </property> 61 62 </bean> 63 64 <!-- 配置事务管理器 --> 65 <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> 66 <property name="sessionFactory" ref="sessionFactory"/> 67 </bean> 68 69 70 71 </beans>
1 <?xml version="1.0" encoding="UTF-8"?> 2 <beans xmlns="http://www.springframework.org/schema/beans" 3 xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://www.springframework.org/schema/beans 6 http://www.springframework.org/schema/beans/spring-beans-2.5.xsd 7 http://www.springframework.org/schema/context 8 http://www.springframework.org/schema/context/spring-context-2.5.xsd 9 http://www.springframework.org/schema/tx 10 http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> 11 12 <!-- SpringMVC的配置规则和Spring是一样的：无缝集成 --> 13 <!-- 配置扫描器;自动装配 --> 14 <context:component-scan base-package="com.ssh.SpringMVC" /> 15 16 <!-- 注解事务配置 --> 17 <tx:annotation-driven transaction-manager="transactionManager" /> 18 19 <!-- 配置视图 --> 20 <bean id="internalView" 21 class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 22 <!-- 配置视图前缀 --> 23 24 <property name="prefix" value="/" /> 25 <!-- 配置视图后缀 --> 26 <property name="suffix" value=".jsp" /> 27 </bean> 28 29 30 </beans>
web.xml配置：
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app version="2.5" 3 xmlns="http://java.sun.com/xml/ns/javaee" 4 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 5 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 6 http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> 7 8 <!-- spring监听器： --> 9 <listener> 10 <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 11 12 </listener> 13 14 <!-- 指定spring文件路径 --> 15 <context-param> 16 <param-name>contextConfigLocation</param-name> 17 <param-value>classpath:applicationContext.xml</param-value> 18 </context-param> 19 20 <!-- =====================配置spring mvc Start================================= --> 21 <servlet> 22 <servlet-name>SpringMVC</servlet-name> 23 <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 24 25 <!--配置springmvc路劲--> 26 <init-param> 27 <param-name>contextConfigLocation</param-name> 28 <param-value>classpath:springmvc.xml</param-value> 29 </init-param> 30 <!-- >=0代表web容器启动的时候加载servlet(数字代表优先级) --> 31 <load-on-startup>1</load-on-startup> 32 </servlet> 33 34 <servlet-mapping> 35 <servlet-name>SpringMVC</servlet-name> 36 <url-pattern>/</url-pattern> 37 38 </servlet-mapping> 39 40 <!-- 配置编码过滤器 --> 41 <filter> 42 <filter-name>encoding</filter-name> 43 <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> 44 <init-param> 45 <param-name>encoding</param-name> 46 <param-value>utf-8</param-value> 47 </init-param> 48 <init-param> 49 <param-name>forceEncoding</param-name> 50 <param-value>true</param-value> 51 </init-param> 52 </filter> 53 <filter-mapping> 54 <filter-name>encoding</filter-name> 55 <url-pattern>/*</url-pattern> 56 </filter-mapping> 57 58 59 60 <welcome-file-list> 61 <welcome-file>index.jsp</welcome-file> 62 </welcome-file-list> 63 </web-app>
第五步：注册页面：
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 8 <html> 9 <head> 10 <base href="<%=basePath%>"> 11 12 <title>用户注册</title> 13 14 15 </head> 16 17 <body> 18 <form action="userController?add" method="post"> 19 <table> 20 <tr> 21 <td>用户名：</td> 22 <td><input type="text" name="username" /></td> 23 </tr> 24 <tr> 25 <td>密码：</td> 26 <td><input type="text" name="password" /></td> 27 </tr> 28 <tr> 29 <td>性别：</td> 30 <td><input type="radio" name="sex" value="男" />男 <input type="radio" name="sex" value="女" />女</td> 31 </tr> 32 <tr> 33 <td></td> 34 <td><input type="submit" /></td> 35 </tr> 36 37 38 </table> 39 40 </form> 41 </body> 42 </html>
注册跳转至处理页：
1 package com.ssh.SpringMVC.controller; 2 3 4 import java.util.List; 5 6 import javax.annotation.Resource; 7 8 9 import org.springframework.web.bind.annotation.RequestMapping; 10 import org.springframework.web.servlet.ModelAndView; 11 12 13 import com.ssh.SpringMVC.Servse.IUserService; 14 import com.ssh.SpringMVC.enity.Users; 15 16 /** 17 * 控制层 18 * @author Administrator 19 * 20 */ 21 @org.springframework.stereotype.Controller 22 @RequestMapping("/userController") 23 public class UserController { 24 25 //注入业务层 26 @Resource 27 IUserService userService; 28 /* 29 * 添加用户 30 */ 31 @RequestMapping(params="add") 32 public String add(Users user){ 33 userService.save(user); 34 35 return "redirect:userController?all"; 36 37 } 38 /* 39 * 查询所有对象 40 */ 41 @RequestMapping(params="all") 42 public ModelAndView all(){ 43 44 //list集合 45 List<Users> li=userService.getObjectALL(); 46 47 return new ModelAndView("index","userLi",li); 48 } 49 }
然后跳转至index.jsp查询所有用户信息：
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 9 <html> 10 <head> 11 <base href="<%=basePath%>"> 12 13 <title>My JSP ‘index.jsp‘ starting page</title> 14 <meta http-equiv="pragma" content="no-cache"> 15 <meta http-equiv="cache-control" content="no-cache"> 16 <meta http-equiv="expires" content="0"> 17 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 18 <meta http-equiv="description" content="This is my page"> 19 <!-- 20 <link rel="stylesheet" type="text/css" href="styles.css"> 21 --> 22 </head> 23 24 <body> 25 <table border="1" cellpadding="10" cellspacing="0"> 26 <tr> 27 <th>id</th> 28 <th>姓名</th> 29 <th>密码</th> 30 <th>性别</th> 31 </tr> 32 <c:forEach items="${userLi}" var="li"> 33 <tr> 34 <td>${li.id}</td> 35 <td>${li.username}</td> 36 <td>${li.password}</td> 37 <td>${li.sex}</td> 38 </tr> 39 </c:forEach> 40 </table> 41 42 </body> 43 </html>
陷阱先知：
本人在做查询的时候犯了个严重的不细心的问题：错误如下：
因为这个错纠结了一个多小时。原因是什么，看下图就明白了：
查询语句忘记了打空格，本来查询from Users，结果from Users合成一个fromUsers,才出现上面的错，都是不细心造成的，谨记，下次务犯。
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Spring+Spring MVC+Hibernate增查（使用注解）
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原文地址：http://www.cnblogs.com/wlx520/p/4816075.html
