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  • 文件输入和输出流

    @Test
        public void TestChiPan() throws IOException {
           // File file=new File("G:\timg.jpg");
            //File file=new File("C:\Users\win10\Desktop\新建文件夹\答辩PPT.pptx");
            File file=new File("wenjian/1.jpg");
            InputStream inputStream=new FileInputStream(file);
            byte[] pic=new byte[inputStream.available()];
            inputStream.read(pic);
            inputStream.close();
    
            File file2 = new File("wenjian/3.jpg");
            FileOutputStream outputStream = new FileOutputStream(file2);
            outputStream.write(pic);
            outputStream.close();
    
        }
    
    
    服务器返回文件
      @RequestMapping("/downLoadFile")
        public  void DownLoadFile(HttpServletRequest request, HttpServletResponse response) throws IOException {
            String fileName=request.getParameter("fileName");
            response.setContentType("text/html;charset=utf-8");
            response.setCharacterEncoding("utf-8");
            System.out.println(fileName);
            //FileInputStream in = new FileInputStream("G:\"+fileName);
            FileInputStream in = new FileInputStream("/"+fileName);
            response.setHeader("content-disposition",
                    "attachment;filename=" + URLEncoder.encode("fileName", "utf-8"));
            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中
            while ((len = in.read(buffer)) > 0) {
                // 输出缓冲区内容到浏览器,实现文件下载
                out.write(buffer, 0, len);
            }
            // 关闭文件流
            in.close();
            // 关闭输出流
            out.close();
        }
    
    
    android 从服务器下载文件
    @Test
        public void TestDownLoadFile() throws IOException {
            URL url = new URL("http://localhost/downLoadFile/downLoadFile?fileName=timg.jpg");
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            con.setReadTimeout(5000);
            con.setConnectTimeout(5000);
            con.setRequestProperty("Charset", "UTF-8");
            con.setRequestMethod("GET");
            if (con.getResponseCode() == 200) {
                InputStream is = con.getInputStream();//获取输入流
                FileOutputStream fileOutputStream = null;//文件输出流
                if (is != null) {
                    fileOutputStream = new FileOutputStream("G:\TestMysql\tig.jpg");//指定文件保存路径,代码看下一步
                    byte[] buf = new byte[1024];
                    int ch;
                    while ((ch = is.read(buf)) != -1) {
                        fileOutputStream.write(buf, 0, ch);//将获取到的流写入文件中
                        System.out.println("写文件");
                    }
                }
                if (fileOutputStream != null) {
                    fileOutputStream.flush();
                    fileOutputStream.close();
                }
            }
        }
    

      

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  • 原文地址:https://www.cnblogs.com/CY-947205926/p/8898102.html
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