java 通过发送json,post请求,返回json数据的方法_Java教程

java 通过发送json,post请求,返回json数据的方法

2021-04-16 13:28daichangxia Java教程

下面小编就为大家分享一篇java 通过发送json,post请求,返回json数据的方法，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

实例如下所示：

									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 {

									            ;

									            // 创建url资源

									            URL url = new URL(urls);

									            // 建立http连接

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

									            // 设置允许输出

									            conn.setDoOutput(true);

									            // 设置允许输入

									            conn.setDoInput(true);

									            // 设置不用缓存

									            conn.setUseCaches(false);

									            // 设置传递方式

									            conn.setRequestMethod("POST");

									            // 设置维持长连接

									            conn.setRequestProperty("Connection", "Keep-Alive");

									            // 设置文件字符集:

									            conn.setRequestProperty("Charset", "UTF-8");

									            // 转换为字节数组

									            byte[] data = (jsonParam.toString()).getBytes();

									           // 设置文件长度

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

									           // 设置文件类型:

									           conn.setRequestProperty("contentType", "application/json");

									            // 开始连接请求

									            conn.connect();     

									          OutputStream out = new DataOutputStream(conn.getOutputStream()) ;

									            // 写入请求的字符串

									            out.write((jsonParam.toString()).getBytes());

									            out.flush();

									            out.close();

									            System.out.println(conn.getResponseCode());

									            // 请求返回的状态

									            if (HttpURLConnection.HTTP_OK == conn.getResponseCode(){

									                System.out.println("连接成功");

									                // 请求返回的数据

									                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);

									        //返回的是一个[{}]格式的字符串时:                

									        JSONArray jsonArray = new JSONArray(data);            

									        //返回的是一个{}格式的字符串时:            

									        /*JSONObject obj= new JSONObject(data);*/   

									  }

									}