HttpURlConnection的用法

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1.activity_main.xml 布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:id="@+id/activity_main"    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:orientation="vertical"    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.sh.newworktest.MainActivity">    <Button        android:id="@+id/send_request"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Send Request"/>    <ScrollView        android:layout_width="match_parent"        android:layout_height="match_parent">        <TextView            android:id="@+id/responst_text"            android:layout_width="match_parent"            android:layout_height="wrap_content"/>    </ScrollView></LinearLayout>

2.ManiActivity.java

  public class MainActivity extends AppCompatActivity implements View.OnClickListener {    TextView responseText;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button sendRequest =(Button)findViewById(R.id.send_request);        responseText =(TextView)findViewById(R.id.responst_text);        sendRequest.setOnClickListener(this);    }    @Override    public void onClick(View v) {           switch (v.getId()){              case R.id.send_request:                   sendRequestWithHttpURLConnection();                  break;               default:           }    }     private void sendRequestWithHttpURLConnection(){         //开启线程来发起网络的请求         new Thread(new Runnable() {             @Override             public void run() {                 HttpURLConnection connection =null;                 BufferedReader reader =null;                 try{                     URL url = new URL("http://www.baidu.com");                     connection = (HttpURLConnection) url.openConnection();                     connection.setRequestMethod("GET");                     connection.setConnectTimeout(8000);                     connection.setReadTimeout(8000);                     InputStream in = connection.getInputStream();                     //下面对获取到的输入流进行读取                     reader = new BufferedReader( new InputStreamReader(in));                     StringBuilder response =  new StringBuilder();                     String line;                     while((line = reader.readLine()) !=null){                         response.append(line);                     }                     showResponse(response.toString());                 }                 catch (Exception e){                     e.printStackTrace();                 }finally {                     if  (reader != null){                        try{                            reader.close();                        }catch (IOException e){                            e.printStackTrace();                        }                     }                    if (connection !=null){                        connection.disconnect();                    }                 }             }         }).start();     }    private void showResponse(final String response){        runOnUiThread(new Runnable() { //android是不允许在子线程中进行ui操作，需要切换到主线程            @Override            public void run() {                   //在这里进行ui操作，将结果显示到界面上                  responseText.setText((response));            }        });    }}
3.AndroidManifest.xml
  <?xml version="1.0" encoding="utf-8"?><manifest package="com.sh.newworktest"          xmlns:android="http://schemas.android.com/apk/res/android">    ......   <uses-permission android:name="android.permission.INTERNET"/></manifest>

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