[챕터 2-9-2] HTTP

결과화면

요청 버튼 클릭 시 html 소스파일을 받게된다.

 

 

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프로젝트명 : MyHttp

 

 

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MainActivity.java

 

package org.minokuma.myhttp;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {

    EditText editText;
    TextView textView;

    Handler handler = new Handler();

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

        editText = findViewById(R.id.editText);
        textView = findViewById(R.id.textView);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final String urlStr = editText.getText().toString();

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        request(urlStr);
                    }
                }).start();
            }
        });
    }

    public void request(String urlStr){

        try {

            StringBuilder stringBuilder = new StringBuilder();

            URL url = new URL(urlStr);
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            if (httpURLConnection != null){
                httpURLConnection.setConnectTimeout(10000);
                httpURLConnection.setRequestMethod("GET");
                httpURLConnection.setDoInput(true);

                int resCode = httpURLConnection.getResponseCode();

                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream()));
                String line = null;
                while (true){
                    line = bufferedReader.readLine();
                    if (line == null){
                        break;
                    }

                    stringBuilder.append(line + "\n");
                }
                bufferedReader.close();
                httpURLConnection.disconnect();
            }

            println("응답 => " + stringBuilder.toString());

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void println(final String data){
        handler.post(new Runnable() {
            @Override
            public void run() {
                textView.append(data + "\n");
            }
        });
    }

}

 

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AndroidManifest.xml

 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="org.minokuma.myhttp">

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

    <application
        android:usesCleartextTraffic="true"
        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>