Android Studio的笔记--HttpURLConnection使用GET下载zip文件

http get下载zip文件

MainActivity.java

用HttpURLConnection GET方法进行需注意：
1、Android 9及以上版本需要设置这个，否则会有警告
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
2、清单中要申请网络权限写入权限
< uses-permission android:name=“android.permission.INTERNET” />
< uses-permission android:name=“android.permission.WRITE_EXTERNAL_STORAGE” />
3、要在application中添加android:usesCleartextTraffic=“true”。否则会有警告，好像加这个有风险，没有细研究
4、关于下载的位置Environment.getExternalStorageDirectory()的路径在/storage/emulated/0
5、关于下载的测试地址http://nginx.org/download/nginx-1.23.4.zip
6、关于下载的两种方式

package com.lxh.romupgrade;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
    Button bt_post;
    Button bt_post2;
    Context mcontext;
    private static final String TAG = "MainActivity3 lxh";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt_post = findViewById(R.id.bt_post);
        bt_post2 = findViewById(R.id.bt_post2);
        mcontext = MainActivity.this;
        bt_post.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i(TAG, "onClick");
                download_2();
            }
        });
        bt_post2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.i(TAG, "onClick");
                // Android 9及以上版本需要设置这个，否则会有警告
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
                    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                    StrictMode.setThreadPolicy(policy);
                }
                download_3();
            }
        });
    }
    private void download_2() {
        new DownloadZipFileTask().execute();
    }
    public static void download_3() {
        Log.i(TAG, "download_3");
        String url = "http://nginx.org/download/nginx-1.23.4.zip";
        FileOutputStream fos = null;
        InputStream in = null;
        try {
            URL u = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) u.openConnection();
            conn.setRequestMethod("GET");
            int responseCode = conn.getResponseCode();
            Log.i(TAG, "responseCode=" + responseCode);
            if (responseCode == HttpURLConnection.HTTP_OK) {
                fos = new FileOutputStream(Environment.getExternalStorageDirectory() + "/file3.zip");
                byte[] buffer = new byte[1024];
                int len;
                while ((len = conn.getInputStream().read(buffer)) != -1) {
                    fos.write(buffer, 0, len);
                }
                fos.close();
                conn.getInputStream().close();
                Log.i(TAG, "download ok");
            } else {
                Log.i(TAG, "Handle error case here");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            if (in != null) {
                try {
                    in.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}
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package com.lxh.romupgrade;
import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * create by lxh on 2023/10/10 Time：20:21
 * tip:HTTP 下载
 */
public class DownloadZipFileTask extends AsyncTask<Void, Integer, Void> {
    @Override
    protected Void doInBackground(Void... params) {
        Log.i("lxh", "doInBackground");
        try {
            URL url = new URL("http://nginx.org/download/nginx-1.23.4.zip");
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod("GET");
            connection.connect();
            int fileSize = connection.getContentLength();
            InputStream inputStream = connection.getInputStream();
            FileOutputStream outputStream = new FileOutputStream(Environment.getExternalStorageDirectory() + "/file2.zip");
            byte[] buffer = new byte[4096];
            int bytesRead;
            int totalBytesRead = 0;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
                totalBytesRead += bytesRead;
                int progress = (int) (totalBytesRead * 100 / fileSize);
                publishProgress(progress);
            }

            Log.i("lxh", "download ok");
            outputStream.close();
            inputStream.close();
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}
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AndroidMainfest.xml

需要在清单添加

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lxh.romupgrade">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:usesCleartextTraffic="true"
        android:theme="@style/Theme.Romupgrade">
        <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>
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activity_main.xml

布局如下

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <Button
        android:id="@+id/bt_post"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="POST" />
    <Button
        android:id="@+id/bt_post2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="POST2" />
</LinearLayout>
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log

点击按钮回显如下

I/MainActivity3 lxh: onClick
I/lxh: doInBackground
D/NetworkSecurityConfig: No Network Security Config specified, using platform default
I/lxh: download ok

I/MainActivity3 lxh: onClick
I/MainActivity3 lxh: download_3
I/MainActivity3 lxh: responseCode=200
I/MainActivity3 lxh: download ok

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待补充
欢迎指错，一起学习