實例如下所示：
import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import org.json.JSONArray;import org.json.JSONObject;public class GetJsonData {public static String getJsonData(JSONObject jsonParam,String urls) {StringBuffer sb=new StringBuffer();try {;// 創建url資源URL url = new URL(urls);// 建立http連接HttpURLConnection conn = (HttpURLConnection) url.openConnection();// 設置允許輸出conn.setDoOutput(true); // 設置允許輸入conn.setDoInput(true); // 設置不用緩存conn.setUseCaches(false); // 設置傳遞方式conn.setRequestMethod("POST"); // 設置維持長連接conn.setRequestProperty("Connection", "Keep-Alive"); // 設置文件字符集: conn.setRequestProperty("Charset", "UTF-8"); // 轉換為字節數組byte[] data = (jsonParam.toString()).getBytes(); // 設置文件長度conn.setRequestProperty("Content-Length", String.valueOf(data.length)); // 設置文件類型: conn.setRequestProperty("contentType", "application/json"); // 開始連接請求conn.connect(); OutputStream out = new DataOutputStream(conn.getOutputStream()) ;// 寫入請求的字符串out.write((jsonParam.toString()).getBytes());out.flush();out.close();System.out.println(conn.getResponseCode());// 請求返回的狀態if (HttpURLConnection.HTTP_OK == conn.getResponseCode(){System.out.println("連接成功");// 請求返回的數據InputStream in1 = conn.getInputStream();try { String readLine=new String(); BufferedReader responseReader=new BufferedReader(new InputStreamReader(in1,"UTF-8")); while((readLine=responseReader.readLine())!=null){ sb.append(readLine).append("/n"); } responseReader.close(); System.out.println(sb.toString());} catch (Exception e1) {e1.printStackTrace();}} else {System.out.println("error++");}} catch (Exception e) {}return sb.toString();}public static void main(String[] args) {JSONObject jsonParam = new JSONObject();jsonParam.put("id", "1401_1406");jsonParam.put("device_size", "480x720");String url="www.baidu.com";String data=GetJsonData.getJsonData(jsonParam,url); //返回的是一個[{}]格式的字符串時: JSONArray jsonArray = new JSONArray(data); //返回的是一個{}格式的字符串時: /*JSONObject obj= new JSONObject(data);*/ }}以上這篇java 通過發送json,post請求,返回json數據的方法就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持武林網。