基于spring 3.0mvc 框架的文件上传实现

Spring 框架提供了构建 Web 应用程序的全功能 MVC 模块。使用 Spring 可插入的 MVC 架构，可以选择是使用内置的 Spring Web 框架还是 Struts 这样的 Web 框架。通过策略接口，Spring 框架是高度可配置的，而且包含多种视图技术，例如 JavaServer Pages（JSP）技术、Velocity、Tiles、iText 和 POI。Spring MVC 框架并不知道使用的视图，所以不会强迫您只使用 JSP 技术。Spring MVC 分离了控制器、模型对象、分派器以及处理程序对象的角色，这种分离让它们更容易进行定制。

第一步：1. spring使用了apache-commons下得上传组件，因此，我们需要引入两个jar包：

1. apache-commons-fileupload.jar
2. apache-commons-io.jar

第二步：2.  在springmvc-servlet.xml配置文件中，增加CommonsMultipartResoler配置：

<?xml version="1.0" encoding="UTF-8" ?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    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
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- 扫描包 -->
    <context:component-scan base-package="com.tgb.web.controller.annotation"/>

    <!-- 启用注解包 -->
    <mvc:annotation-driven/>

    <!-- 被上面替代
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean>
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean>
    -->

   <!-- 视图解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean> 

     <!-- 上传配置文件 -->

      <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
             <!-- 默认编码 (ISO-8859-1) -->
             <property name="defaultEncoding" value="utf-8"/>
             <!-- 最大文件大小，-1为无限止(-1) -->
             <property name="maxUploadSize" value="20000000000"/>
             <!-- 最大内存大小 (10240)-->
             <property name="maxInMemorySize" value="200000"/>
    </bean>
    <!-- 静态资源访问 -->

<!--     <mvc:resources location="/images/" mapping="/images/**"/>-->

 </beans>

第三步：配置web.xml

 <?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>

   <servlet>
      <servlet-name>springMVC</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:config/springMVC-servlet.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
   </servlet>

    <!-- 解决乱码 -->
     <filter>
        <filter-name>encodingFilter</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>
          <init-param>
            <param-name>froceEncoding</param-name>
             <param-value>true</param-value>
         </init-param>
     </filter>   

      <filter-mapping>
          <filter-name>encodingFilter</filter-name>
          <url-pattern>/*</url-pattern>
      </filter-mapping>   

   <servlet-mapping>
     <servlet-name>springMVC</servlet-name>
     <url-pattern>/</url-pattern>
   </servlet-mapping>
 </web-app>

第四步：建立upload.jsp页面，内容如下：

 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 <%
 String path = request.getContextPath();
 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html>
   <head>
     <base href="<%=basePath%>">

     <title>测试springmvc中上传的实现</title>
     <meta http-equiv="pragma" content="no-cache">
     <meta http-equiv="cache-control" content="no-cache">
     <meta http-equiv="expires" content="0">
     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
     <meta http-equiv="description" content="This is my page">
     <!--
     <link rel="stylesheet" type="text/css" href="styles.css">
     -->
   </head>

   <body>
    <form action="uploadContoller?toupload" method="post" enctype="multipart/form-data">
        文件上传:<input type="file" value="" name="file">
      <input  type="submit" value="上传"/>
    </form>
   </body>
 </html>

建立控制器UploadContoller.java（三种方法支持文件上传），代码如下：

package com.tgb.web.controller.annotation;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Controller
@RequestMapping("/uploadContoller")
public class UploadContoller {

    //========================第一种：======================
    @RequestMapping(params="uploadUser")
    // 普通上传
    public String uploadUser(@RequestParam("file") CommonsMultipartFile file,
            HttpServletRequest request, HttpServletResponse response)
            throws IOException {
        System.out.println("filename++++++++" + file.getOriginalFilename());
        if (!file.isEmpty()) {
            try {
                Date date = new Date();

                FileOutputStream os = new FileOutputStream("../images"
                        + date.getTime() + file.getOriginalFilename());
                InputStream in = file.getInputStream();
                int b = 0;
                while ((b = in.read()) != -1) {
                    os.write(b);
                }
                os.flush();
                os.close();
                in.close();
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        return "success";
    }

    //========================第二种：======================
    @RequestMapping(params="toupload")
    public String toupload(HttpServletRequest request,
            HttpServletResponse response) {

        // 创建一个通用的多部分解析器
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                // 记录上传过程起始时的时间，用来计算上传时间
                int pre = (int) System.currentTimeMillis();
                // 取得上传文件
                MultipartFile file = multiRequest.getFile(iter.next());
                if (file != null) {
                    // 取得当前上传文件的文件名称
                    String myFileName = file.getOriginalFilename();
                    // 如果名称不为“”,说明该文件存在，否则说明该文件不存在
                    if (myFileName.trim() != "") {
                        System.out.println(myFileName);
                        // 重命名上传后的文件名
                        String fileName = "demoUpload"
                                + file.getOriginalFilename();
                        // 定义上传路径
                        String path = "/images/" + fileName;
                        File localFile = new File(path);
                        try {
                            file.transferTo(localFile);
                        } catch (IllegalStateException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                }
                // 记录上传该文件后的时间
                int finaltime = (int) System.currentTimeMillis();
                System.out.println(finaltime - pre);
            }

        }

        return "success";
    }

    //========================第三种：======================
    @RequestMapping(params="niceupload")
    // 优化上传
    public String niceupload(HttpServletRequest request,
            HttpServletResponse response) {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        if (multipartResolver.isMultipart(request)) {
            MultipartHttpServletRequest mulitRequest = (MultipartHttpServletRequest) (request);
            Iterator<String> iterator = mulitRequest.getFileNames();
            while (iterator.hasNext()) {

                MultipartFile fiel = mulitRequest.getFile((String) iterator
                        .next());
                if (fiel != null) {
                    String fileName = "demoUpload" + fiel.getOriginalFilename();
                    String path = "D:/" + fileName;
                    File localfile = new File(path);
                    try {
                        fiel.transferTo(localfile);
                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }
        }
        return "/success";
    }

}

5. 建立success.jsp页面

<%@ page language="java" import="java.util.*"  contentType="text/html;charset=utf-8" pageEncoding="utf-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core"  prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>传递参数</title>

  </head>

  <body>

    <h1>上传成功    +++++++++++</h1>

  </body>
</html>

1. 发布项目，运行测试：http://localhost:8080/springmvc03/upload.jsp
2. 

3、  进入项目发布后的目录，发现文件上传成功：

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