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();
    }
}