Spring MVC 文件下载codes



@RequestMapping(params ="downfile")

public void downfile(HttpServletRequest request,HttpServletResponse response)throwsException{

    Long fileID = ServletRequestUtils.getLongParameter(request,"id",0);

    BufferedInputStream bis =null;

    BufferedOutputStream bos =null;

    OutputStream fos =null;

    InputStream fis =null;

    String result ="";

    if(null!= fileID){

 

        UserFiles userFiles =this.userFileDao.findObject(fileID);

        if(userFiles !=null){

            File downFiles =newFile(userFiles.getFileCurrPath()+userFiles.getFileName()+"."+userFiles.getFileType());

            if(!downFiles.exists()){

                 

                return;

                 

            }

            try{

                fis =newFileInputStream(downFiles);

                bis =newBufferedInputStream(fis);

                fos = response.getOutputStream();

                bos =newBufferedOutputStream(fos);

                ServletUtils.setFileDownloadHeader(request,response, userFiles.getFileName()+"."+userFiles.getFileType());

                intbyteRead =0;

                byte[] buffer =newbyte[8192];

                while((byteRead=bis.read(buffer,0,8192))!=-1){

                    bos.write(buffer,0,byteRead);

                }

                 

                bos.flush();

                fis.close();

                bis.close();

                fos.close();

                bos.close();

            }catch(Exception e) {

                log.info("下载失败了......");

            }

        }

    }

 

}




/**

 * 设置让浏览器弹出下载对话框的Header.

 * 根据浏览器的不同设置不同的编码格式  防止中文乱码

 * @param fileName 下载后的文件名.

 */

public static void setFileDownloadHeader(HttpServletRequest request,HttpServletResponse response, String fileName) {

    try{

        //中文文件名支持

        String encodedfileName =null;

        String agent = request.getHeader("USER-AGENT");

        if(null!= agent && -1!= agent.indexOf("MSIE")){//IE

            encodedfileName = java.net.URLEncoder.encode(fileName,"UTF-8");

        }elseif(null!= agent && -1 != agent.indexOf("Mozilla")){

            encodedfileName =newString (fileName.getBytes("UTF-8"),"iso-8859-1");

        }else{

            encodedfileName = java.net.URLEncoder.encode(fileName,"UTF-8");

        }

        response.setHeader("Content-Disposition","attachment; filename=\"" + encodedfileName + "\"");

    }catch(UnsupportedEncodingException e) {

        e.printStackTrace();

    }

}




package com.sniper.springmvc.action;

 

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

 

import org.springframework.http.HttpHeaders;

import org.springframework.http.HttpStatus;

import org.springframework.http.ResponseEntity;

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 com.sniper.springmvc.utils.ValidateUtil;

 

@Controller

public class FileDownloadAction extendsRootAction {

 

    // 下载mime//application/vnd.ms-excel

    privateString contentType = "application/vnd.ms-excel";

    // 下在文件名字,,一般取值为attachement;filename="ss.pdf"

    privateString fileName;

    privateString filePath;

 

    publicString getFileName() throwsUnsupportedEncodingException {

        fileName = filePath.substring(filePath.lastIndexOf("/") +1);

        String Agent = request.getHeader("User-Agent");

        if(null != Agent) {

            Agent = Agent.toLowerCase();

            if(Agent.indexOf("firefox") != -1) {

                fileName =new String(fileName.getBytes(),"iso8859-1");

            }else if(Agent.indexOf("msie") != -1) {

                fileName = URLEncoder.encode(fileName,"UTF-8");

            }else {

                fileName = URLEncoder.encode(fileName,"UTF-8");

            }

        }

        returnfileName;

    }

 

    /**

     * 需要通过 redirect:download 传递文件路径或者文件类型

     *

     * @param path

     * @param type

     * @return

     * @throws IOException

     */

    @ResponseBody

    @RequestMapping(value ="download")

    publicResponseEntity<byte[]> download(

            @RequestParam(value ="path") String path,

            @RequestParam(value ="type", required =false) String type)

            throwsIOException {

        // 确定各个成员变量的值

        this.filePath = path;

 

        if(ValidateUtil.isValid(contentType)) {

            this.contentType = type;

        }

 

        HttpHeaders headers =new HttpHeaders();

        byte[] body =null;

        HttpStatus httpState = HttpStatus.NOT_FOUND;

        File file =new File(path);

        if(file.exists() && file.isFile()) {

 

            InputStream is =new FileInputStream(file);

            body =new byte[is.available()];

            is.read(body);

            is.close();

            headers.add("Content-Type",this.contentType);

            headers.add("Content-Length","" + body.length);

            headers.add("Content-Disposition","attachment;filename="

                    + getFileName());

            httpState = HttpStatus.OK;

 

        }

 

        ResponseEntity<byte[]> entity =new ResponseEntity<>(body, headers,

                httpState);

 

        returnentity;

    }

}