HttpURLConnection和okHttp两种获取网络数据实现

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/a_fly_pig/article/details/68950611

废话少说，直接上代码。简单易懂。

xml如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_net"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.waterlamp.NetActivity">
    <Button
        android:id="@+id/okhttp"
        android:text="okhttp请求"
        android:layout_width="150dp"
        android:layout_height="37dp"
        android:layout_alignBottom="@+id/http"
        android:layout_alignParentEnd="true"
        android:layout_alignParentTop="true" />

    <Button
        android:id="@+id/http"
        android:text="HTTP请求"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />

    <ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentStart="true"
    android:layout_below="@+id/okhttp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentEnd="true" >
        <TextView
            android:id="@+id/stringData"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </ScrollView>
</RelativeLayout>

activity如下：

public class NetActivity extends AppCompatActivity implements View.OnClickListener{
private Button http,okhttp;
    private TextView stringData;
    private String web="https://www.baidu.com";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_net);
        http= (Button) findViewById(R.id.http);
        okhttp= (Button) findViewById(R.id.okhttp);
        stringData= (TextView) findViewById(R.id.stringData);
        http.setOnClickListener(this);
        okhttp.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
       switch (v.getId()){
           case R.id.http:
               sendRequestWithHttpURLConnection();
           break;
           case R.id.okhttp:
               sendRequestWithokHttp();
           break;
       }
    }
    private void sendRequestWithHttpURLConnection(){
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection=null;
                BufferedReader reader=null;
                try {
                    URL url=new URL(web);
                    connection= (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(5000);
                    connection.setReadTimeout(5000);
                    InputStream in=connection.getInputStream();
                    reader=new BufferedReader(new InputStreamReader(in));
                    StringBuffer response=new StringBuffer();
                    String line;
                    while ((line=reader.readLine())!=null){
                        response.append(line);
                    }
                    showRespond(response.toString());
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }finally {
                    if (reader!=null){
                        try {
                            reader.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }).start();
    }

    private void showRespond(final String response) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                stringData.setText(response);
            }
        });
    }
    private void sendRequestWithokHttp(){
        new Thread(new Runnable() {
            @Override
            public void run() {

                try {
                    OkHttpClient client=new OkHttpClient();
                    Request request=new Request.Builder()
                            .url(web).build();
                    Response  response=client.newCall(request).execute();
                    String str=response.body().string();
                    showRespond(str);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

注意：需要在加权限 

1.<uses-permission android:name="android.permission.INTERNET"/>

2.okhttp3需要在gradle添加依赖

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.android.support:design:24.2.1'
    compile 'com.squareup.okhttp3:okhttp:3.4.1'//依赖
    testCompile 'junit:junit:4.12'
}