HttpURLConnection_get 网络请求

HttpURLConnection 网络请求get
注意： 需要在清单文件中配置文件
uses-permission android:name=”android.permission.INTERNET”

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }
    //监听
    public void onPlay(View v){
            new Thread(){
                @Override
                public void run() {
                    super.run();
                    onBoys();
                }
            }.start();
    }
    //实现
    public void onBoys(){
        try {
            //地址
            // 快递小哥的网址：https://www.juhe.cn/docs/api/id/266
            URL url = new URL("http://v.juhe.cn/WNXG/city?key=ed1088c0c4ac34c42a270fabf0de9b5a");
            //
           HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            //设置请求方式
            connection.setRequestMethod("GET");
            //设置读取网络数据的时间
            connection.setReadTimeout(5000);
            //设置与服务建立的连接时间
            connection.setConnectTimeout(5000);

            //服务器响应
            int code = connection.getResponseCode();
            if (code == 200){
                InputStream in = (InputStream) connection.getContent();
                //
                String json = Boys.ongson(in);
                System.out.println("快递小哥："+json);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}



> 还需要建立一个Utils包，主要实现流转化工具类

     //流转化工具类
public class Boys {
    public static String ongson(InputStream input){
        //流转化成字符串
        try {
            //字节数组
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            byte[] by = new byte[1024];
            int len = 0;
            while ((len = input.read(by)) != -1){
                out.write(by,0,len);
            }
            return  out.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  null;
    }
}