SpringMVC上传下载.

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一、导入jar

二、配置

1.web.xml配置

<servlet>
         <servlet-name>spring</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        
        <load-on-startup>1</load-on-startup>
   </servlet>
   <servlet-mapping>
       <servlet-name>spring</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>

2.spring-servlet.xml配置（注意：springmvc默认加载WEB-INF下面的servlet name-servlet.xml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" xmlns:p="http://www.springframework.org/schema/p"
   xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context"
   xmlns:util="http://www.springframework.org/schema/util"
   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-3.0.xsd
            http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
            http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-3.0.xsd">

<context:component-scan base-package="cn.com.controller"/>
<mvc:annotation-driven/>

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
   <property name="defaultEncoding" value="utf-8"/>
</bean>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
   <property name="prefix" value="/WEB-INF/pages/"/>
   <property name="suffix" value=".jsp"></property>
</bean>
</beans>

三、页面

index.jsp

<body>
<a href="${pageContext.request.contextPath }/mvc/toUpload"> Upload </a>
<a href="${pageContext.request.contextPath }/mvc/toDownload">Download</a>
</body>

upload.jsp

<body>

<h1>${message }</h1>
   <form action="${pageContext.request.contextPath }/mvc/upload" enctype="multipart/form-data" method="post">
       File:<input type="file" name="uploadFile" onchange="getFileSize(this);"/><br/>
       <input type="submit" value="Submit"/><br/>
   </form>

</body>

download.jsp

<body>
<a href="${pageContext.request.contextPath }/mvc/download?fileName=jar.png">jar.png</a><br/>
<a href="${pageContext.request.contextPath }/mvc/download?fileName=development.zip">development.zip</a>
</body>

四、上传下载文件class

    package cn.com.controller;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.UnsupportedEncodingException;

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

import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.domain.User;

@RequestMapping("/mvc")
@Controller("fileUploadController")
public class FileUploadController {
   @RequestMapping("toUpload")
   public String toUploadPage(HttpServletRequest request){
       request.setAttribute("message", "please upload a image");
       return "upload";
   }
   @RequestMapping("upload")
   public String upload(User user,HttpServletRequest request, @RequestParam(value="uploadFile") MultipartFile file) throws Exception{
       //MultipartFile封装了上传文件的所有信息
       //获取上传的源文件的名称
       if(file.isEmpty()){
           System.out.println("请选择要上传的文件...");
           return "error";
       }
       String fileName = file.getOriginalFilename();
       String realpath = request.getSession().getServletContext().getRealPath("/upload");
       File f = new File(realpath+"\\"+fileName);
       FileCopyUtils.copy(file.getInputStream(), new FileOutputStream(f));
       return "success";
   }
   @RequestMapping("download")
   public String download(String fileName,HttpServletRequest request,HttpServletResponse response) throws Exception{
       response.setContentType("application/octet-stream");
       response.setCharacterEncoding("utf-8");
       String path = request.getSession().getServletContext().getRealPath("/upload")+"/"+fileName;
       response.setHeader("Content-disposition", "attachment;filename="+new String(fileName.getBytes("iso8859-1"),"utf-8"));
//       BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(path)));
//       BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
//       byte[] b = new byte[2048];
//       int len;
//       while((len=bis.read(b,0,b.length))!=-1){
//           bos.write(b, 0, len);
//       }
//       bis.close();
//       bos.close();
       FileCopyUtils.copy(new FileInputStream(new File(path)), response.getOutputStream());
       return null;
   }
   @RequestMapping("toDownload")
   public String toDowmload(){
       return "download";
   }
}

注：@RequestParam(value="uploadFile")，此注解value的值必须与表单中上传文件的name属性值相同，download方法中的两种方式都可以实现具体功能：注释掉的code是一种方式，FileCopyUtils是一种方式。实际上，文件名，文件路径这些信息应该保存在数据库中，但是本文中只用到了springmvc，没有使用其他持久化框架或者jdbc，没有与数据库交互，所以有些本来需要向数据库中保存或者提取的数据，写死或者给省略掉了。后续会进行更改。

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