安卓使用http的get獲取不到網頁資訊

我想要抓取百度頁面的資料，用的get，下面是方法，也加了權限<uses-permission android:name="android.permission.INTERNET"></uses-permission>，可是運行后獲得不了資訊,什么也沒有，這是為什么啊，對于http的get好苦惱啊，有人能解答一下嗎

package com.example.testget;
import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    public static final int SHOW_RESPONSE=0;//用于更新操作
    private Button sendRequest;
    private TextView responseText;

    @SuppressLint("HandlerLeak")
    //用于處理和發送訊息的Hander
    private Handler handler=new Handler(){
        public void handleMessage(Message msg){
            //如果返現msg.what=SHOW_RESPONSE，則進行制定操作，如想進行其他操作，則在子執行緒里將SHOW_RESPONSE改變
            switch (msg.what){
                case SHOW_RESPONSE:
                    String response=(String)msg.obj;
                    //進行UI操作，將結果顯示到界面上
                    responseText.setText(response);
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sendRequest=(Button)findViewById(R.id.send_request);
        responseText=(TextView)findViewById(R.id.response_text);
        sendRequest.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        if(v.getId()==R.id.send_request){
            sendRequestWithHttpURLConnection();
        }
    }

    private void sendRequestWithHttpURLConnection(){
        //開啟執行緒來發起網路請求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection=null;
                try{
                    URL url=new URL("https://www.baidu.com");
                    connection=(HttpURLConnection)url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setReadTimeout(8000);

                    InputStream in=connection.getInputStream();
                    //下面對獲取到的輸入流進行讀取
                    BufferedReader bufr=new BufferedReader(new InputStreamReader(in));
                    StringBuilder response=new StringBuilder();
                    String line=null;
                    while((line=bufr.readLine())!=null){
                        response.append(line);
                    }

                    Message message=new Message();
                    message.what=SHOW_RESPONSE;
                    //將服務器回傳的資料存放到Message中
                    message.obj=response.toString();
                    handler.sendMessage(message);
                }catch(Exception e){
                    e.printStackTrace();
                }finally {
                    if(connection!=null){
                        connection.disconnect();
                    }
                }
            }
        }).start();
    }
}

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標籤：Android

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