Java发送Post请求

转载地址：https://www.cnblogs.com/sun-jin/p/7495352.html

//访问准备

URL url = new URL("http:***");

//post参数

 Map<String,Object> params = new LinkedHashMap<>();

      params.put("geomInfo", "");

      params.put("f", "json");

 

 //开始访问

  StringBuilder postData = new StringBuilder();

  for (Map.Entry<String,Object> param : params.entrySet()) {

      if (postData.length() != 0) postData.append('&');

      postData.append(URLEncoder.encode(param.getKey(), "UTF-8"));

      postData.append('=');

      postData.append(URLEncoder.encode(String.valueOf(param.getValue()), "UTF-8"));

  }

  byte[] postDataBytes = postData.toString().getBytes("UTF-8");

 

  HttpURLConnection conn = (HttpURLConnection)url.openConnection();

  conn.setRequestMethod("POST");

  conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

  conn.setRequestProperty("Content-Length", String.valueOf(postDataBytes.length));

  conn.setDoOutput(true);

  conn.getOutputStream().write(postDataBytes);

 

  Reader in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));

 

  StringBuilder sb = new StringBuilder();

  for (int c; (c = in.read()) >= 0;)

      sb.append((char)c);

  String response = sb.toString();

  System.out.println(response);

  return response;