Android——JDK的get请求方式

layout文件：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.hanqi.testapp3.TestActivity2"
     android:orientation="vertical">

     <Button
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:text="JDK-Get方式"
         android:onClick="bt1_onClick"/>
     <EditText
         android:layout_width="match_parent"
         android:layout_height="200dp"
         android:id="@+id/et_2"/>
 </LinearLayout>

java类：

 package com.hanqi.testapp3;

 import android.app.ProgressDialog;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.EditText;
 import android.widget.Toast;

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

 public class TestActivity2 extends AppCompatActivity {

     EditText et_2;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_test2);
         et_2 = (EditText)findViewById(R.id.et_2);
     }
     //JDK的Get方式
     public void bt1_onClick(View v)
     {
         //1.进度对话框
         final ProgressDialog progressDialog = ProgressDialog.show(this,null,"正在加载，请稍后……");
         //2.开启子线程，访问网络
         new Thread(){
             public void run()
             {
                 try {
                     //1—URL
                     URL url = new URL("http://www.baidu.com"+"?name=tom");

                     //2—URL获取连接
                     HttpURLConnection huc = (HttpURLConnection)url.openConnection();
                     //请求方式
                     huc.setRequestMethod("GET");
                     //设置超时
                     huc.setConnectTimeout(3000);
                     huc.setReadTimeout(3000);
                     //连接并发送请求
                     huc.connect();
                     //接收
                     //判断返回状态码  200
                     int code = huc.getResponseCode();
                     if (code == 200)
                     {
                         //接收数据
                         //输入流
                         InputStream is = huc.getInputStream();
                         //读取流
                         //1—byte数组
                         byte[] b = new byte[1024];
                         //2—读到数组的长度
                         int i = 0;
                         //3—数据
                         final StringBuilder sb1 = new StringBuilder();
                         while ((i = is.read(b))>0)
                         {
                             sb1.append(new String(b,0,i));
                         }
                         //释放资源
                         is.close();
                         huc.disconnect();
                         //通过主线程显示信息和关闭对话框
                         runOnUiThread(new Runnable() {
                             @Override
                             public void run() {
                                 et_2.setText(sb1);
                                 progressDialog.dismiss();
                             }
                         });
                     }
                     else
                     {
                         Toast.makeText(TestActivity2.this, "连接错误，返回的状态码 = "+code, Toast.LENGTH_SHORT).show();
                     }
                 }
                 catch (Exception e)
                 {
                     e.printStackTrace();
                     progressDialog.dismiss();
                 }
             }
         }.start();
     }
 }