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我正在使用 Base91 将图像作为字符串存储在 mysql 数据库中。当我检索字符串以将其转换回图像时,该字符串似乎已被数据库损坏。

我确定它在数据库中已损坏,因为我在单个设备上进行了单独的拍照测试,将其转换为 Base91 byte[],将 转换byte[]为字符串(使用 Latin1),将字符串转换回byte[],然后转换为图像,它的工作。当我尝试在中间使用服务器时,图像最终会损坏。

我尝试将数据库上特定列的排序规则从 utf8 更改为 ascii 到 latin1,但没有运气。

代码:

  1. 编码图片:

    File file1 = new File(path);
    FileInputStream in = new FileInputStream(file1);
    
    byte[] imagesBytes = new byte[(int) file1.length()];
    in.read(imagesBytes, 0, (int) file1.length());
    
    _picture = new String(Base91.encode(imagesBytes), Base91.CHARSET);
    //appointment.addPicture(new String(Base91.encode(imagesBytes), Base91.CHARSET));
    
  2. 存储编码图像:

     JsonObject jsonx = new JsonObject();
     jsonx.addProperty("picture", request.getParameter("picture"));
    
     db.insert("AppointmentPicture",
                "(AppointmentID, picture)values(?,?)",
                new Object[]{appointment.getDbID(), jsonx.toString()},
                false);
    
  3. 检索图像:

    ResultSet rSet = db.query("AppointmentPicture", new String[]{"picture"}, "AppointmentID = ?", new Object[]{appointmentID});
        System.out.println("pictures grabbed");
    
        JsonObject json = new JsonObject();
        int counter = 0;
    
        while (rSet.next()) {
            counter++;
            json.addProperty(String.valueOf(counter), rSet.getString("picture"));
    
        }
    
        json.addProperty("count", String.valueOf(counter));
    
        response.getWriter().write(json.toString());
        System.out.println("pictures returned");
    
  4. 解码图像:

     String serverResponse = in.readLine();
    
     JSONObject json = new JSONObject(serverResponse);
    
     int count = Integer.parseInt(json.getString("count"));
    
     for(int i = 0; i < count; i++){
    
         JSONObject j = new JSONObject(json.getString(String.valueOf(i + 1)));
         byte[] picBytes = j.getString("picture").getBytes(Base91.CHARSET);
         File file = new File(imageDirectory, String.valueOf(System.currentTimeMillis()) + ".jpeg");
         BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(file));
         out.write(picBytes, 0, picBytes.length);
    
     }
    
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