springmvc环境的搭建

最近应公司要求，用了2天时间学了springmvc的搭建，就简单总结一下：

springmvc和struts2的比较，因为我是学过struts的，它们都是基于mvc模式而设计的web层框架

它们最大的区别：

1、入口 

spring mvc的入口是servlet，而struts2是filter

（这里要指出，filter和servlet是不同的。以前认为filter是servlet的一种特殊），

这样就导致了二者的机制不同，这里就牵涉到servlet和filter的区别了。

 2、主要机制

springmvc是方法级别的拦截，一个方法对应一个request上下文，而方法同时又跟一个url对应,参数的传递是直接注入到方法中的，是该方法独有的。

struts2是类级别的拦截， 一个类对应一个request上下文， struts是在接受参数的时候，可以用属性来接受参数， 这就说明参数是让多个方法共享的,

这也就无法用注解或其他方式标识所属方法了

intercepter的实现机制。struts有以自己的interceptor机制，spring mvc 用的是独立的AOP方式。这样导致struts的配置文件量还是比spring mvc大，

虽然struts的配置能继承，spring mvc使用更加简洁。

springmvc环境的搭建：

建立一个web项目：

首先在目录/WEB-INF/web.xml配置如下内容：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
 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_2_5.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
 
  <!-- 配置前端控制器 -->
  <servlet>
   <servlet-name>springmvc</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <!-- 服务器开启的时候，SpringMVC也开启 -->
   <load-on-startup>1</load-on-startup>
  </servlet>
 
  <servlet-mapping>
   <servlet-name>springmvc</servlet-name>
   <url-pattern>*.action</url-pattern>
  </servlet-mapping>
 
  <servlet-mapping>
   <servlet-name>springmvc</servlet-name>
   <!-- mvc的名称可以随便取, 这样前台可以通过 /项目名/mvc/控制器指定的name名称访问 -->
   <url-pattern>/mvc/*</url-pattern>
  </servlet-mapping>
 
</web-app>

 

然后还是/WEB-INF/springmvc-servlet.xml(注：该文件名是[servletname]-servlet.xml)，内容如下：

<?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-2.0.xsd">
 
 <!-- 配置controller，由spring来管理controller，前台通过name指定的值来获取访问相应的controller，
 因为ID不支持，后面action要和servlet中配置的后置相同 -->
 <bean class="com.controller.UserController" name="/list.action"></bean>
 
 <!-- 配置框架提供的视图解析器，通过配置前缀和后缀规则来解析,ModelAndView -->
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix" value="/WEB-INF/jsp/"></property>
  <property name="suffix" value=".jsp"></property>
 </bean>
 
</beans>

 

 

Controller层

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/**  * 基于注解的SpringMVC+Hibernate3.6的CRUD  * @author Saiteam  *  */ @Controller public class UserController {           private UserDaoImpl userDao=new UserDaoImpl();           @RequestMapping(value="/list.action")     public String list(HttpServletRequest request){         List<User> user = userDao.list();         request.setAttribute("users", user);         return "list";     }     @RequestMapping(value="/saveForward.action")     public String saveForward(HttpServletRequest request){         return "add";     }     @RequestMapping(value="/add.action")     public String add(HttpServletRequest request) throws Exception{         request.setCharacterEncoding("UTF-8");         User user = new User();         user.setName(request.getParameter("name"));         user.setPassword(request.getParameter("password"));         user.setSex(request.getParameter("sex"));         user.setAddress(request.getParameter("address"));         user.setPhone(request.getParameter("phone"));         user.setEmail(request.getParameter("email"));         userDao.save(user);         request.setAttribute("users", userDao.list());         return "list";     }           @RequestMapping(value="/delete.action")     public String delete(HttpServletRequest request){         int id = Integer.parseInt(request.getParameter("id"));         userDao.delete(id);         request.setAttribute("users", userDao.list());         return "list";     }           @RequestMapping(value="/update.action")     public String update(HttpServletRequest request) throws Exception{         request.setCharacterEncoding("UTF-8");         User user = new User();         user.setId(Integer.parseInt(request.getParameter("id")));         user.setName(request.getParameter("name"));         user.setPassword(request.getParameter("password"));         user.setSex(request.getParameter("sex"));         user.setAddress(request.getParameter("address"));         user.setPhone(request.getParameter("phone"));         user.setEmail(request.getParameter("email"));         userDao.update(user);         request.setAttribute("users", userDao.list());         return "list";     }           @RequestMapping(value="/get.action")     public String get(HttpServletRequest request){         int id = Integer.parseInt(request.getParameter("id"));         request.setAttribute("user", userDao.get(id));         return "update";     }     /**      * 登陆功能      * @param request      * @return      * @throws Exception      */     @RequestMapping(value="login.action")     public String login(HttpServletRequest request) throws Exception{         request.setCharacterEncoding("UTF-8");         String name = request.getParameter("name");         String password = request.getParameter("password");                   //测试         System.out.println("-------name-----------"+name);         System.out.println("-------password-----------"+password);                   if(name != null && !name.equals("")){             if(password != null && !password.equals("")){                 User model = userDao.login(name, password);                 //测试                 System.out.println("-------------model--------"+model);                                   if(model != null && !model.equals("")){                         request.setAttribute("users", userDao.list());                         return "list";                 }else{                     request.setAttribute("error", "用户或密码错误！");                     return "forward:/login.jsp";                 }             }else{                 request.setAttribute("error", "密码不能为空！");                 return "forward:/login.jsp";             }         }else{             request.setAttribute("error", "用户名不能为空！");             return "forward:/login.jsp";         }               }           //实现注册功能     @RequestMapping(value="register.action")     public String register(HttpServletRequest request) throws Exception{         request.setCharacterEncoding("UTF-8");         User user = new User();         user.setName(request.getParameter("name"));         user.setPassword(request.getParameter("password"));         user.setSex(request.getParameter("sex"));         user.setAddress(request.getParameter("address"));         user.setPhone(request.getParameter("phone"));         user.setEmail(request.getParameter("email"));         userDao.save(user);         return "forward:/index.jsp";     }                 /**      * 跳转到登陆页面      * @param request      * @return      */     @RequestMapping(value="loginForward.action")     public String loginForwad(HttpServletRequest request){         return "forward:/login.jsp";     }     /**      * 转发到注册页面      * @param request      * @return      */     @RequestMapping(value="rgf.action")     public String registerForwad(HttpServletRequest request){         return "forward:/register.jsp";     }       }

 service层

+ View Code?

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public class UserDaoImpl implements UserDao {       public  void save(User user) {          Session session = HibernateSessionFactory.getSession();          Transaction tx = session.getTransaction();          try {              tx.begin();              session.save(user);              tx.commit();          } catch (HibernateException e) {              if (tx != null) { // 如果存在事务，则回滚                  tx.rollback();              }              throw e; // 抛出异常          } finally {              if (session != null) // 如果session存在，则关闭                  session.close();          }      }        public  void delete(int id) {          Session session = HibernateSessionFactory.getSession();         String hql = "DELETE User u WHERE u.id=:id";         session.createQuery(hql).setInteger("id", id).executeUpdate();     }        public void update(User user){          Session session = HibernateSessionFactory.getSession();          Transaction tx = session.getTransaction();           try {              tx.begin();             session.update(user);              tx.commit();          } catch (HibernateException e) {              if (tx != null) { // 如果存在事务，则回滚                  tx.rollback();              }              throw e; // 抛出异常          } finally {              if (session != null) // 如果session存在，则关闭                  session.close();          }      }         public  User get(int id) {              Session session = HibernateSessionFactory.getSession();             try {                  User user = (User) session.get(User.class, id);                  return user;              } finally {                  if (session != null) {                      session.close();                  }              }          }       public List<User> list(){         Session session = HibernateSessionFactory.getSession();         String hql = "FROM User";         return session.createQuery(hql).list();     }                 //登陆功能     public User login(String name,String password){         Session session = HibernateSessionFactory.getSession();         String hql = "FROM User u WHERE u.name=:name AND u.password=:password";         return (User) session.createQuery(hql).setString("name", name).setString("password", password).uniqueResult();     } }

 jsp页面自己写