java发起http请求获取返回的Json对象方法_Java教程

java发起http请求获取返回的Json对象方法

2021-04-18 14:21jeanFlower Java教程

下面小编就为大家分享一篇java发起http请求获取返回的Json对象方法，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

话不多说，先看代码！

									/**

									 * Created by david on 2017-7-5.

									 */

									import com.google.gson.JsonObject;

									import com.google.gson.JsonParser;

									import java.io.BufferedReader;

									import java.io.IOException;

									import java.io.InputStream;

									import java.io.InputStreamReader;

									import java.net.HttpURLConnection;

									import java.net.URL;

									public class HttpRequestUtil {

									 /**

									  * 发起http请求并获取结果

									  * @param requestUrl 请求地址

									  */

									 public static JsonObject getXpath(String requestUrl){

									  String res="";

									  JsonObject object = null;

									  StringBuffer buffer = new StringBuffer();

									  try{

									   URL url = new URL(requestUrl);

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

									   if(200==urlCon.getResponseCode()){

									    InputStream is = urlCon.getInputStream();

									    InputStreamReader isr = new InputStreamReader(is,"utf-8");

									    BufferedReader br = new BufferedReader(isr);

									    String str = null;

									    while((str = br.readLine())!=null){

									     buffer.append(str);

									    }

									    br.close();

									    isr.close();

									    is.close();

									    res = buffer.toString();

									    JsonParser parse =new JsonParser();

									    object = (JsonObject) parse.parse(res);

									   }

									  }catch(IOException e){

									   e.printStackTrace();

									  }

									  return object;

									 }

									 public static JsonObject postDownloadJson(String path,String post){

									  URL url = null;

									  try {

									   url = new URL(path);

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

									   httpURLConnection.setRequestMethod("POST");// 提交模式

									   // conn.setConnectTimeout(10000);//连接超时 单位毫秒

									   // conn.setReadTimeout(2000);//读取超时 单位毫秒

									   // 发送POST请求必须设置如下两行

									   httpURLConnection.setDoOutput(true);

									   httpURLConnection.setDoInput(true);

									   // 获取URLConnection对象对应的输出流

									   PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());

									   // 发送请求参数

									   printWriter.write(post);//post的参数 xx=xx&yy=yy

									   // flush输出流的缓冲

									   printWriter.flush();

									   //开始获取数据

									   BufferedInputStream bis = new   BufferedInputStream(httpURLConnection.getInputStream());

									   ByteArrayOutputStream bos = new ByteArrayOutputStream();

									   int len;

									   byte[] arr = new byte[1024];

									   while((len=bis.read(arr))!= -1){

									    bos.write(arr,0,len);

									    bos.flush();

									   }

									   bos.close();

									   JsonParser parse = new JsonParser();

									   return (JsonObject)parse.parse(bos.toString("utf-8"));

									  } catch (Exception e) {

									   e.printStackTrace();

									  }

									  return null;

									 }

									 //测试

									 public static void main(String args [] ) {

									  JsonObject res = null;

									 //  res = getXpath("http://ip.taobao.com/service/getIpInfo.php?ip=63.223.108.42");

									  res = postDownloadJson("http://ip.taobao.com/service/getIpInfo.php?ip=63.223.108.42","123");

									  System.out.println(res);

									  System.out.println(res.get("code"));

									  System.out.println(res.get("data"));

									 }

									}