文件上传下载(三)下载文件

 下载：

//下载文件
　　　　public void downloadFile(HttpServletResponse response, String url)throws IOException {
        response.reset();
        response.setContentType("application/x-msdownload; charset=GBK");
        String fileName = new String(url.getBytes("gb2312"), "ISO-8859-1");
        response.setHeader("Content-Disposition", "attachment; filename="" + fileName);
         // 获取文件路径
        String filePath="d:\upload\"+url;
        File file=new File(filePath);
        FileInputStream in = new FileInputStream(file);
        BufferedInputStream bis=new BufferedInputStream(in);
        byte[] buffer = new byte[512];
        int i=bis.read(buffer);
        OutputStream outputStream=response.getOutputStream();
        while(i!=-1){
            outputStream.write(buffer,0,i);
            i=bis.read(buffer);
        }
        outputStream.flush();
        in.close();
        bis.close();
        outputStream.close();
        
    }

展示图片

public static final String showImg(HttpServletResponse response, String path) throws IOException {
          FileInputStream fileIs=null;
          try {
              fileIs = new FileInputStream(path);
          } catch (Exception e) {
           return null;
          }
          int i=fileIs.available(); //得到文件大小   
          byte data[]=new byte[i];   
          fileIs.read(data);  //读数据   
          response.setContentType("image/*"); //设置返回的文件类型   图片
          OutputStream outStream=response.getOutputStream(); //得到向客户端输出二进制数据的对象   
          outStream.write(data);  //输出数据      
          outStream.flush();  
          outStream.close();   
          fileIs.close();
          return path;
    }

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