如何發送字符串從我的java類

Question

Client.java 發送字符串從客戶端的servlet成servlet

String url = "http://localhost:8084/Lab/url"; 

    URL obj = new URL(url); 
    HttpURLConnection con = (HttpURLConnection) obj.openConnection(); 

    // optional default is GET 
    con.setRequestMethod("GET"); 
      con.setDoInput(true); 
      con.setDoOutput(true); 
      dos = new DataOutputStream(con.getOutputStream()); 
      dos.writeBytes(resultJson.toString()); 
    int responseCode = con.getResponseCode(); 
      BufferedReader in = new BufferedReader(new InputStreamReader(
           con.getInputStream())); 
      String inputLine; 
      while ((inputLine = in.readLine()) != null) 
       System.out.println(inputLine); 

      dos.flush(); 
      dos.close(); 
      in.close(); 

的Servlet 獲取值並返回

protected void processRequest(HttpServletRequest request, HttpServletResponse response) 
     throws ServletException, IOException { 
    response.setContentType("text/html;charset=UTF-8"); 
    PrintWriter out = response.getWriter(); 

我不知道下一步該怎麼做。

Answer 1

嘗試以下方法：

1. 要傳遞的字符串作爲參數，取代String url = "[http://localhost:8084/Lab/url]";與String url = "[http://localhost:8084/Lab/url?str=YOURSTRING]";
2. 在小服務程序，以檢索信息添加：字符串消息話題=的request.getParameter（ 「STR」 ）;

在使用[1] GET我們傳遞 「STR」 參數中包含我們的字符串的URL。 我們使用servlet [2]中的getParameter()來檢索消息。

正如@Anders說，我們也可以做使用POST

我希望這是有益的。

乾杯

PS：網址是W/O []

[更新]
傳遞使用POST

String param = "str=YOURSTRING"; 
    String request = "http://localhost:8084/"; 
    URL url = new URL(request); 
    HttpURLConnection connection = (HttpURLConnection) 
    url.openConnection();   
    connection.setDoOutput(true); 
    connection.setDoInput(true); 
    connection.setInstanceFollowRedirects(false); 
    connection.setRequestMethod("POST"); 
    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); 
    connection.setRequestProperty("charset", "utf-8"); 
    connection.setRequestProperty("Content-Length", "" + Integer.toString(param.getBytes().length)); 
    connection.setUseCaches (false); 

    DataOutputStream out = new DataOutputStream(connection.getOutputStream()); 
    out.writeBytes(param); 
    out.flush(); 
    out.close(); 
    connection.disconnect();