java发起发起http请求获取返回的请求获取返回的Json对象方法对象方法
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！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"));
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