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Android的HttpUrlConnection

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Dream城堡
发布2018-12-28 17:07:54
5470
发布2018-12-28 17:07:54
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文章被收录于专栏:Spring相关Spring相关

Android的HttpUrlConnection

项目结构:

image.png

activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

    <Button
        android:id="@+id/send_request"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="发送请求"
        />
    
    
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/response_text"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />



    </ScrollView>

</LinearLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.networktest">

    <uses-permission android:name="android.permission.INTERNET"/>
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>
MainActivity:
package com.example.networktest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private static final String TAG = "MainActivity";
    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.response_text);
        sendRequest.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.send_request) {
            sendRequestWithHttpConnection();
        }
    }

    private void sendRequestWithHttpConnection() {

        //开启线程
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                BufferedReader br = null;
                try {
                    URL url = new URL("https://www.baidu.com/");

                    connection = (HttpURLConnection) url.openConnection();


                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setConnectTimeout(8000);
                    InputStream in = connection.getInputStream();

//                    下面对输入流进行读取

                    br =   new BufferedReader(new InputStreamReader(in));

                    StringBuilder response = new StringBuilder();
                    String line;
                    while((line=br.readLine())!=null){
                        response.append(line);
                    }

                    Log.d(TAG, "run: "+response.toString());

                    showResponse(response.toString());



                } catch (Exception e) {


                }


            }
        }).start();


    }

    private void showResponse(final String response) {

        Log.d(TAG, "showResponse: "+response);

        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                //进行ui操作 把结果显示到界面
                responseText.setText(response);
            }
        });
    }
}

通常建议使用handler进行处理:

package com.example.networktest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private static final String TAG = "MainActivity";
    TextView responseText;
    
    //在主线程中定义一个handler
    private Handler handler = new Handler(){

        //这个方法是在主线程里面执行的
        @Override
        public void handleMessage(Message msg) {
            //所以可以在主线程更新ui了
        String str = (String) msg.obj;
            //进行ui操作 把结果显示到界面
                responseText.setText(response);
        }

    };

    @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.response_text);
        sendRequest.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.send_request) {
            sendRequestWithHttpConnection();
        }
    }

    private void sendRequestWithHttpConnection() {

        //开启线程
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                BufferedReader br = null;
                try {
                    URL url = new URL("https://www.baidu.com/");

                    connection = (HttpURLConnection) url.openConnection();


                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setConnectTimeout(8000);
                              //获取服务器返回的状态码
                int code = conn.getResponseCode();
                //如果code==200说明请求成功
                if (code == 200) {
                    InputStream in = connection.getInputStream();

//                    下面对输入流进行读取

                    br =   new BufferedReader(new InputStreamReader(in));

                    StringBuilder response = new StringBuilder();
                    String line;
                    while((line=br.readLine())!=null){
                        response.append(line);
                    }

                    Log.d(TAG, "run: "+response.toString());
                    
           
                    //获取成功 则返回服务器的返回数据 以流的形式返回的
                
                    //创建message对象
                    Message msg = new Message();
                    msg.obj =response.toString();

                    //拿我们的handler(助手)告诉系统我们要更新ui

                    handler.sendMessage(msg);

                    //把流的数据展示到textView上
                    //由于把流转字符串是常见操作 所以建议抽出来作为一个工具类utils
//                    tv_result.setText(str);



                }

                    showResponse();



                } catch (Exception e) {


                }


            }
        }).start();


    }

    
}
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原始发表:2018.12.25 ,如有侵权请联系 cloudcommunity@tencent.com 删除

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