import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.UnsupportedEncodingException;

import java.net.HttpURLConnection;

import java.net.URL;

import org.json.JSONObject;

 

public class TestHuanXin {

public static void main(String[] args) {

    String url="http://www.itxm.net";

        try {

              String request="id=23";

              String response=getData(url,request);

              System.out.println(response);

 

              JSONObject root = new JSONObject(response);

 

              JSONObject jsonObject =root.getJSONObject("data");

 

             String token=jsonObject.getString("access_token");

 

              System.out.println("token="+token);

 

       } catch (Exception e) {

              e.printStackTrace();

       }

}

 

public static String getData(String url, String request)throws UnsupportedEncodingException, IOException {

       String charset = "UTF-8";

       ByteArrayOutputStream outStream = new ByteArrayOutputStream();

       HttpURLConnection connect = (HttpURLConnection) (new URL(url).openConnection());

       connect.setRequestMethod("GET");

       connect.setDoOutput(true);

       connect.setConnectTimeout(1000 * 10);

       connect.setReadTimeout(1000 * 80);

       conn.setRequestProperty("ContentType",  "application/x-www-form-urlencoded"); //采用通用的URL百分号编码的数据MIME类型来传参和设置请求头

       connect.setDoInput(true);

       // 连接

       connect.connect();

       // 发送数据

       connect.getOutputStream().write(request.getBytes(charset));

       // 接收数据

       int responseCode = connect.getResponseCode();

       if (responseCode == HttpURLConnection.HTTP_OK) {

       InputStream in = connect.getInputStream();

       byte[] data = new byte[1024];

       int len = 0;

       while ((len = in.read(data, 0, data.length)) != -1) {

              outStream.write(data, 0, len);

       }

              in.close();

       }

       // 关闭连接

       connect.disconnect();

       String response = outStream.toString("UTF-8");

       return response;

       }

}

文档来源：java通用URL接口地址调用方式GET和POST方式