话不多说，先看代码！
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 {
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"));
}
}
看第一个方法，发送get请求获取后台数据，其中，将返回回来的字符串解析成json对象用到了google的Gson.jar包，用到了其中JsonParser的parse方法。
第二个方法，发送post数据到后台并获取后台数据。
以上这篇java发起http请求获取返回的Json对象方法就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。
