向servlet发送“+”字符utf-8,java应用程序[重复]

Question

kggsW9YizUuRpjB/RtppZImnC8SekMGAWGnCmw+wPMwn7fWJva0QbSK/Slt/DDsZ

kggsW9YizUuRpjB/RtppZImnC8SekMGAWGnCmw wPMwn7fWJva0QbSK/Slt/DDsZ

你能告诉我怎么编码这些字符串吗？或者我做错了什么。

发件人：

url = new URL(url_globalApp);
        connection = (HttpURLConnection)url.openConnection();
        connection.setRequestMethod("POST");
        connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

        connection.setRequestProperty("Content-Language", "en-US");  
        connection.setRequestProperty("Accept-Charset", "UTF-8"); 
        connection.setUseCaches (false);
        connection.setDoInput(true);
        connection.setDoOutput(true);

        //Send request
        DataOutputStream wr = new DataOutputStream (
                connection.getOutputStream ());
        //**************** first try ************//
        wr.write(pairs_1.getBytes("UTF-8"), 0, pairs_1.length());

        //**************** second try ************//
            //wr.writeBytes(new String(pairs_1.getBytes(),"UTF-8"));

        //**************** third try ************//
            //wr.writeUTF(pairs_1);
            wr.flush ();
            wr.close ();

servlet：

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("UTF-8");
    Map <String,String[]> parameters = request.getParameterMap();
    System.out.println(parameters.get("field_value_1")[0]);

Answer 1

查询参数的值必须是URL编码的。

的URL编码

kggsW9YizUuRpjB/RtppZImnC8SekMGAWGnCmw+wPMwn7fWJva0QbSK/Slt/DDsZ

是

kggsW9YizUuRpjB%2FRtppZImnC8SekMGAWGnCmw%2BwPMwn7fWJva0QbSK%2FSlt%2FDDsZ

java.net.URLEncoder.encode("kggsW9YizUuRpjB/RtppZImnC8SekMGAWGnCmw+wPMwn7fWJva0QbSK/Slt/DDsZ", "UTF-8")