HTTP网络请求POST请求

package com.example.day01_http_post01;

import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.util.day01_http_post01.NextUtil;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class MainActivity extends AppCompatActivity {

    private EditText editText;
    private Button button;
    private TextView textView;
    private String str;
    private final int UPDATR_UI = 1;
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what){
                case UPDATR_UI:
                    textView.setText(msg.obj.toString());
                    break;
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取资源id
        editText = findViewById(R.id.ed_name);
        button = findViewById(R.id.btn);
        textView = findViewById(R.id.text);
        //点击
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //判断是否有可用网络
                if(!NextUtil.hasNetwork(MainActivity.this)){
                    Toast.makeText(MainActivity.this,"当前无网络",Toast.LENGTH_SHORT).show();
                    return;
                }
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        query(editText.getText().toString());
                    }
                }).start();
            }
        });
    }
    private String baseUrl = "http://tcc.taobao.com/cc/json/mobile_tel_segment.htm";
    private void query(String num) {
        try {
            //定义url地址
            URL url = new URL(baseUrl);
            //打开连接
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            //设置请求方式
            urlConnection.setRequestMethod("POST");
            //超时
            urlConnection.setReadTimeout(5000);
            urlConnection.setConnectTimeout(5000);
            //表示需要输出的参数
            urlConnection.setDoOutput(true);
            //输出参数
            String params = "tel="+num;
            urlConnection.getOutputStream().write(params.getBytes());
            urlConnection.getOutputStream().flush();
            //获取状态码
            int responseCode = urlConnection.getResponseCode();
            if(responseCode == 200){
                str = stream(urlConnection.getInputStream());
            }else{
                str = "error"+responseCode;
            }
            handler.sendMessage(handler.obtainMessage(UPDATR_UI,str));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private String stream(InputStream is) throws IOException {
        InputStreamReader isr = new InputStreamReader(is,"gbk");
        BufferedReader br = new BufferedReader(isr);
        StringBuilder builder = new StringBuilder();
        for(String t = br.readLine();t != null;t = br.readLine()){
            builder.append(t);
        }
        return builder.toString();
    }
}

package com.util.day01_http_post01;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NextUtil {
    //是否有可用网络
    public static boolean hasNetwork(Context context){
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = cm.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isAvailable();
    }
}