java框架springmvcajaxjsonupload/download+maven+DES/MD5请求加密

package com.zhouwuji.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.Iterator;
import java.util.Map;

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

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
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
public class FileController {
    @RequestMapping("/download.do")
    public void doMain(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
        //得到要下载的文件名
         String fileName =request.getParameter("filename"); 
         System.out.println("fileName:"+fileName.trim());
         //23239283-92489-阿凡达.avi
         // fileName="zhangruan.txt";
         // fileName = new String(fileName.getBytes("iso8859-1"),"UTF-8");
        //上传的文件都是保存在/WEB-INF/upload目录下的子目录当中
        String fileSaveRootPath=request.getServletContext().getRealPath("/WEB-INF/upload");
        //得到要下载的文件
        File file = new File(fileSaveRootPath + "\\" + fileName);
        //如果文件不存在
        if(!file.exists()){
            request.setAttribute("message", "您要下载的资源已被删除！！");
            request.getRequestDispatcher("/fail.jsp").forward(request, response);
            return;
        }
        //处理文件名
        String realname = fileName.substring(fileName.indexOf(".")+1);
        //设置响应头，控制浏览器下载该文件
        response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realname, "UTF-8"));
        //读取要下载的文件，保存到文件输入流
          
        FileInputStream in = new FileInputStream(file);
        //创建输出流
        OutputStream out = response.getOutputStream();
        //创建缓冲区
        byte buffer[] = new byte[1024];
        int len = 0;
        //循环将输入流中的内容读取到缓冲区当中
        while((len=in.read(buffer))>0){
            //输出缓冲区的内容到浏览器，实现文件下载
            out.write(buffer, 0, len);
        }
        System.out.println("下载成功");
        //关闭文件输入流
        in.close();
        //关闭输出流
        out.close();
    }
    
    
    
    @RequestMapping("/upload.do")   //@RequestParam("uploadfile")
    @ResponseBody
    public String queryFileData(@RequestParam("uploadfile")CommonsMultipartFile file,HttpServletRequest request){
        System.out.println("+++++++++++++++++"+request.getParameter("username"));
        /*MultipartFile是对当前上传的文件的封装，
         * 当同时上传多个文件时，可以给定多个MultipartFile参数（数组）
         */
        if(file!=null){
            System.out.println("文件对象接到了！");
            //获取文件名
            String filename=file.getOriginalFilename();
            //获取上传路径
            String path=request.getSession().getServletContext().getRealPath("/WEB-INF/upload/"+filename.trim());
            System.out.println("path:"+path);
            
            //创建文件流并指定写入路径
            File destFile=new File(path);
            
                //springmvc的方式
                //该方法自动操作，不需要额外的去关闭IO流
                //复制临时文件到指定文件夹下
                try {
                    FileUtils.copyInputStreamToFile(file.getInputStream(), destFile);
                    System.out.println("上传成功");
                    return "/success.jsp";
                } catch (IOException e) {
                    e.printStackTrace();
                    System.out.println("上传失败");
                    return "/error.jsp";
                }
        }else{
            System.out.println("文件没有对象接到了！");
            return "/error.jsp";
            
        }
    }
 }
/*文件对象接到了！
filename：中软笔记.txt
path:D:/apache-tomcat-7.0.82-windows-x64/apache-tomcat-7.0.82/webapps/project-ajaxjson/upload/中软笔记.txt
上传成功*/