Spring3.1 MVC注解配置学习

DEMO结构：

1.导入Spring3.1 MVC所依赖的jar（具体根据项目来）

2.在web.xml中配置DispatcherServlet

<!-- 中文过滤器 -->
	<filter>
		<filter-name>CharacterFilter</filter-name>
		<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>CharacterFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<servlet>
	
		<servlet-name>demo</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>demo</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

3.新建demo-servlet.xml配置

<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">

	<context:component-scan base-package="com.controller"/> <!--扫描到@Controller注解的Bean  -->
	
	<mvc:annotation-driven/>
	<!-- 静态文件处理 /resources/**映射到 ResourceHttpRequestHandler进行处理，location指定静态资源的位置 -->
	<mvc:resources mapping="/resources/**" location="/resources/" />  
	
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
		<property name="prefix" value="/WEB-INF/jsp/"/>
		<property name="suffix" value=".jsp"/>
	</bean>
	
	<!-- 文件上传处理 -->
	<bean id="multipartResolver"
       class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize">
        <value>1024</value>
    </property>
    <property name="maxInMemorySize">
        <value>4096</value>
    </property>
   </bean>
	<!-- 全局异常处理 -->
	<bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
		<property name="exceptionMappings">
			<props>
				<prop key="com.exception.UserException">error</prop>
				<prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error</prop>
			</props>
		</property>
	</bean>
	
</beans>

4.创建UserContorller类

package com.controller;


import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;


import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;


import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;


import com.bean.User;
import com.exception.UserException;


@Controller
@RequestMapping("/user") //要访问这个controller都要在前面加上/user
public class UserController {
	private static Map<String,User> map = new HashMap<String,User>();
	public UserController() {
		map.put("u1", new User("u1","p1","[email protected]"));
		map.put("u2", new User("u2","p1","[email protected]"));
		map.put("u3", new User("u3","p1","[email protected]"));
		map.put("u4", new User("u4","p1","[email protected]"));
		map.put("u5", new User("u5","p1","[email protected]"));
	}
	
	@RequestMapping(value="/users",method=RequestMethod.GET)
	public String list(Model model){ //Model 用于传递值
		model.addAttribute("users", map);
		return "user/users";
	}
	
	@RequestMapping(value="/add",method=RequestMethod.GET)
	public String add(@ModelAttribute("user")User user){
		return "user/useradd";
	}
	
	@RequestMapping(value="/add",method=RequestMethod.POST)
	public String add(@Validated User user,BindingResult result,@RequestParam("files")MultipartFile[] files,HttpServletRequest req) throws IOException{//BindingResult必须紧跟@Validated
		if(result.hasErrors()){
			System.out.println("error");
			return "user/useradd";
		}
		for (MultipartFile multipartFile : files) {
			if(multipartFile.isEmpty()){
				continue;
			}
			System.out.println(multipartFile.getName()+","+multipartFile.getOriginalFilename()+","+multipartFile.getContentType()+","+multipartFile.getSize());
			String path = req.getSession().getServletContext().getRealPath("/resources");//获取resources在工程下的路径
			File f = new File(path+"\\"+multipartFile.getOriginalFilename());
			System.out.println(path+"\\"+multipartFile.getOriginalFilename());
			FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), f);
		}
		
		
		map.put(user.getUsername(), user);
			System.out.println("no error");
		return "redirect:/user/users"; //客户端跳转
	}
	
	@RequestMapping(value="/{username}/show",method=RequestMethod.GET)//将URL中的占位符绑定到操作方法的入参中
	public String show(@PathVariable String username,Model model){
		model.addAttribute(map.get(username));
		return "user/show";
	}
	
	@RequestMapping(value="/{username}/update",method=RequestMethod.GET)
	public String update(@PathVariable String username,Model model){
		model.addAttribute(map.get(username));
		return "user/update";
	}
	@RequestMapping(value="/{name}/update",method=RequestMethod.POST)
	public String update(@PathVariable String name,@Validated User user,BindingResult br){
		if(br.hasErrors()){
			return "user/update";
		}
		map.put(name, user);
		return "redirect:/user/users";
	}
	
	@RequestMapping(value="/{name}/delete",method=RequestMethod.GET)
	public String delete(@PathVariable String name){
		map.remove(name);
		return "redirect:/user/users";
	}
	
	@RequestMapping(value="/login")
	public String login(String username,String password,HttpServletRequest req,Model model){
		if(!map.containsKey(username)){
			throw new UserException("用户名不正确！");
		}
		User user = map.get(username);
		if(!user.getPassword().equals(password)){
			throw new UserException("密码不正确！");
		}
		HttpSession  session = req.getSession();
		session.setAttribute("u", user);
		model.addAttribute("users", map);
		return "user/users";
	}
	
	//返回JSON数据
	@RequestMapping(value="/{username}/show",method=RequestMethod.GET,params="json")
	@ResponseBody //在SpringMVC中可以在Controller的某个方法上加@ResponseBody注解，表示该方法的返回结果直接写入HTTP response body中。 
	public User show(@PathVariable String username) {
		return map.get(username);
	}
	
}

5.返回Map集合<users.jsp>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> 
<!-- 引入jstl标签用于遍历-->
  <body>
  		<h1>当前用户-->${u.username }</h1>
		<c:forEach var="um" items="${users}">
			<a href="${um.value.username}/show">${um.value.username}</a>----
			${um.value.password }----
			${um.value.email }----<a href="${um.value.username}/update">修改</a>
			<a href="${um.value.username}/delete">删除</a>
			<br/>
		</c:forEach>
		<a href="add">添加</a>
  </body>

6.返回JSON数据
注:需导入jackson-all-1.9.4.jar
http://localhost:8080/SpringMVC_03/user/u2/show?json

结果将会解析到body

7.表单提交、文件上传、服务器表单验证

<%@ taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
<!-- 引入spring标签-->
<body>
  		<sf:form method="post" modelAttribute="user" enctype="multipart/form-data">
  			<ul style="list-style: none;">
  				<li>用户名：<sf:input path="username"/><sf:errors path="username"/></li>
  				<li>密码：<sf:password path="password"/><sf:errors path="password"/></li>
  				<li>Email：<sf:input path="email"/><sf:errors path="email"/></li>
  				<li>文件:<input type="file" name="files"/></li>
  				<li>文件:<input type="file" name="files"/></li>
  				<li>文件:<input type="file" name="files"/></li>
  				<li><input type="submit" value="添加"/></li>
  			</ul>
  		</sf:form>
  </body>

8.error处理

新建UserException

package com.exception;

public class UserException extends RuntimeException {

	private static final long serialVersionUID = 1L;

	public UserException() {
		super();
		// TODO Auto-generated constructor stub
	}

	public UserException(String arg0, Throwable arg1) {
		super(arg0, arg1);
		// TODO Auto-generated constructor stub
	}

	public UserException(String arg0) {
		super(arg0);
		// TODO Auto-generated constructor stub
	}

	public UserException(Throwable arg0) {
		super(arg0);
		// TODO Auto-generated constructor stub
	}
	
}

异常页面

  <body>
    	<h1>${exception.message}</h1>
  </body>

附：Demo下载