2020年已经过了一半，记录韶华（空贴）

心已赠人 2023-02-21 12:47 16阅读 0赞

少年就是少年，他们看春风不喜，看夏蝉不烦，看秋风不悲，看冬雪不叹，看满身富贵懒察觉，看不公不允敢面对，只因他们是少年。

## 文件下载 ##

public HttpServletResponse download(String path, HttpServletResponse response) {
        try {
          // path是指欲下载的文件的路径。
          File file = new File(path);
          // 取得文件名。
          String filename = file.getName();
          // 取得文件的后缀名。
          String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();
    
          // 以流的形式下载文件。
          InputStream fis = new BufferedInputStream(new FileInputStream(path));
          byte[] buffer = new byte[fis.available()];
          fis.read(buffer);
          fis.close();
          // 清空response
          response.reset();
          // 设置response的Header
          response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
          response.addHeader("Content-Length", "" + file.length());
          OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
          response.setContentType("application/octet-stream");
          toClient.write(buffer);
          toClient.flush();
          toClient.close();
        } catch (IOException ex) {
          ex.printStackTrace();
        }
        return response;
      }
    
      public void downloadLocal(HttpServletResponse response) throws FileNotFoundException {
        // 下载本地文件
        String fileName = "Operator.doc".toString(); // 文件的默认保存名
        // 读到流中
        InputStream inStream = new FileInputStream("c:/Operator.doc");// 文件的存放路径
        // 设置输出的格式
        response.reset();
        response.setContentType("bin");
        response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
        // 循环取出流中的数据
        byte[] b = new byte[100];
        int len;
        try {
          while ((len = inStream.read(b)) > 0)
            response.getOutputStream().write(b, 0, len);
          inStream.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    
      public void downloadNet(HttpServletResponse response) throws MalformedURLException {
        // 下载网络文件
        int bytesum = 0;
        int byteread = 0;
    
        URL url = new URL("windine.blogdriver.com/logo.gif");
    
        try {
          URLConnection conn = url.openConnection();
          InputStream inStream = conn.getInputStream();
          FileOutputStream fs = new FileOutputStream("c:/abc.gif");
    
          byte[] buffer = new byte[1204];
          int length;
          while ((byteread = inStream.read(buffer)) != -1) {
            bytesum += byteread;
            System.out.println(bytesum);
            fs.write(buffer, 0, byteread);
          }
        } catch (FileNotFoundException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }

文件下载二

public void download(HttpServletRequest request, HttpServletResponse response,InputStream inputSteam, String fileRealName)
    			throws UnsupportedEncodingException, IOException {
    		// 处理下,如果文件名称存在逗号,google浏览器不能下载,换为下划线
    		fileRealName = fileRealName.replace(",", "_");
    		fileRealName = fileRealName.replace("，", "_");
    		response.setCharacterEncoding("utf-8");
    		response.setContentType("multipart/form-data");
    		String downloadFileName = "";
    		if (request.getHeader("User-Agent").toUpperCase().indexOf("MSIE") > 0 
    				|| request.getHeader("User-Agent").toUpperCase().indexOf("LIKE GECKO") > 0) {
    			downloadFileName = URLEncoder.encode(fileRealName, "UTF-8");
    		} else {
    			downloadFileName = new String(fileRealName.getBytes("UTF-8"),
    					"ISO8859-1");
    		}
    		response.setHeader("Content-disposition", "attachment; filename="
    				+ downloadFileName);
    		BufferedInputStream bis = null;
    		BufferedOutputStream bos = null;
    		
    		bis = new BufferedInputStream(inputSteam);
    		bos = new BufferedOutputStream(response.getOutputStream());
    		byte[] buff = new byte[2048];
    		int bytesRead;
    		while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
    			bos.write(buff, 0, bytesRead);
    		}
    		inputSteam.close();
    		bis.close();
    		bos.close();
    	}
    
    
    
    
    
    
             try {
                 InputStream is = new FileInputStream("D:/tomcat7/webapps/temp/HT_1596452307000876586.pdf");
                 super.download(request, response, is, "项目申报书.pdf");
                 //declarationService.downloadLocal(response,path);
            } catch (Exception e) {
                e.printStackTrace();
            }