Android——JDK的get请求方式

Posted 2020-07-24 柒寒

layout文件：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="com.hanqi.testapp3.TestActivity2"
11     android:orientation="vertical">
12 
13     <Button
14         android:layout_width="match_parent"
15         android:layout_height="wrap_content"
16         android:text="JDK-Get方式"
17         android:onClick="bt1_onClick"/>
18     <EditText
19         android:layout_width="match_parent"
20         android:layout_height="200dp"
21         android:id="@+id/et_2"/>
22 </LinearLayout>

java类：

 1 package com.hanqi.testapp3;
 2 
 3 import android.app.ProgressDialog;
 4 import android.support.v7.app.AppCompatActivity;
 5 import android.os.Bundle;
 6 import android.view.View;
 7 import android.widget.EditText;
 8 import android.widget.Toast;
 9 
10 import java.io.InputStream;
11 import java.net.HttpURLConnection;
12 import java.net.URL;
13 
14 public class TestActivity2 extends AppCompatActivity {
15 
16     EditText et_2;
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_test2);
21         et_2 = (EditText)findViewById(R.id.et_2);
22     }
23     //JDK的Get方式
24     public void bt1_onClick(View v)
25     {
26         //1.进度对话框
27         final ProgressDialog progressDialog = ProgressDialog.show(this,null,"正在加载，请稍后……");
28         //2.开启子线程，访问网络
29         new Thread(){
30             public void run()
31             {
32                 try {
33                     //1—URL
34                     URL url = new URL("http://www.baidu.com"+"?name=tom");
35 
36                     //2—URL获取连接
37                     HttpURLConnection huc = (HttpURLConnection)url.openConnection();
38                     //请求方式
39                     huc.setRequestMethod("GET");
40                     //设置超时
41                     huc.setConnectTimeout(3000);
42                     huc.setReadTimeout(3000);
43                     //连接并发送请求
44                     huc.connect();
45                     //接收
46                     //判断返回状态码  200
47                     int code = huc.getResponseCode();
48                     if (code == 200)
49                     {
50                         //接收数据
51                         //输入流
52                         InputStream is = huc.getInputStream();
53                         //读取流
54                         //1—byte数组
55                         byte[] b = new byte[1024];
56                         //2—读到数组的长度
57                         int i = 0;
58                         //3—数据
59                         final StringBuilder sb1 = new StringBuilder();
60                         while ((i = is.read(b))>0)
61                         {
62                             sb1.append(new String(b,0,i));
63                         }
64                         //释放资源
65                         is.close();
66                         huc.disconnect();
67                         //通过主线程显示信息和关闭对话框
68                         runOnUiThread(new Runnable() {
69                             @Override
70                             public void run() {
71                                 et_2.setText(sb1);
72                                 progressDialog.dismiss();
73                             }
74                         });
75                     }
76                     else
77                     {
78                         Toast.makeText(TestActivity2.this, "连接错误，返回的状态码 = "+code, Toast.LENGTH_SHORT).show();
79                     }
80                 }
81                 catch (Exception e)
82                 {
83                     e.printStackTrace();
84                     progressDialog.dismiss();
85                 }
86             }
87         }.start();
88     }
89 }