上传，下载，分批下载

最新推荐文章于 2025-12-23 15:41:46 发布

原创最新推荐文章于 2025-12-23 15:41:46 发布 · 169 阅读

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CC 4.0 BY-SA版权

本文探讨了文件上传和下载操作，重点介绍了如何实现分批下载，以提高大文件下载的效率和用户体验。

Day11.04作业

- 布局
- Main

布局

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

  <Button
      android:id="@+id/upload"
      android:text="上传"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content" />

    <Button
        android:id="@+id/download"
        android:text="下载"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/duan_upload"
        android:text="继续上传"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />


    <Button
        android:id="@+id/fen_download"
        android:text="分批下载"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Main

package com.example.day1104homework;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.internal.Util;
import okhttp3.logging.HttpLoggingInterceptor;
import okio.BufferedSink;
import okio.Okio;
import okio.Source;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = "MainActivity";
    private Button upload;
    private Button download;
    private Button duanUpload;
    private Button fenDownload;
    private OkHttpClient client ;
    private File file;

    private long max;
    private long number;
    private long count;

    private Handler handler = new Handler();
    private String upload_url="http://192.168.43.145/hfs/";
    private String get_url="http://uvideo.spriteapp.cn/video/2019/0512/56488d0a-7465-11e9-b91b-1866daeb0df1_wpd.mp4";

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

        //初始化
        upload = (Button) findViewById(R.id.upload);
        download = (Button) findViewById(R.id.download);
        duanUpload = (Button) findViewById(R.id.duan_upload);
        fenDownload = (Button) findViewById(R.id.fen_download);


        //log拦截器
        HttpLoggingInterceptor httpLoggingInterceptor = new HttpLoggingInterceptor();
        httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        //token拦截器
        Interceptor interceptor = new Interceptor() {
            @Override
            public Response intercept(Chain chain) throws IOException {
                Request token = chain.request().newBuilder().header("token", "1231123").build();
                //拦截网址
                String host = chain.request().url().host();
                String s = chain.request().url().encodedPath();
                Log.i(TAG, "intercept: "+host+s);
                //拦截请求的方式
                String method = chain.request().method();
                Log.i(TAG, "intercept: "+method);
                //拦截请求的内容
                return chain.proceed(token);
            }
        };
        client = new OkHttpClient.Builder()
                .addInterceptor(interceptor)
                .addInterceptor(httpLoggingInterceptor)
                .build();

        //动态获取权限
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},100);
        }

        //上传
        upload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RequestBody requestBody = RequestBody.create(MediaType.parse("media/mp4"), "/storage/emulated/0/hahah.mp4");
                MultipartBody body = new MultipartBody.Builder()
                        .addFormDataPart("file","ludandan.mp4",requestBody)
                        .setType(MultipartBody.FORM)
                        .build();
                Request request = new Request.Builder()
                        .post(body)
                        .url(upload_url)
                        .build();
                MainActivity.this.client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, "上传失败", Toast.LENGTH_SHORT).show();
                            }
                        });
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                            handler.post(new Runnable() {
                                @Override
                                public void run() {
                                    Toast.makeText(MainActivity.this, "上传成功", Toast.LENGTH_SHORT).show();
                                }
                            });
                    }
                });
            }
        });


        //下载
        download.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                final Request request = new Request.Builder()
                        .url(get_url)
                        .get()
                        .build();

                MainActivity.this.client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, "下载失败", Toast.LENGTH_SHORT).show();
                            }
                        });
                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                        InputStream inputStream = response.body().byteStream();
                        FileOutputStream fileOutputStream = new FileOutputStream("/storage/emulated/0/Movies/qazxsw.mp4");
                        int len = 0;
                        byte[] bytes = new byte[1024];
                        while ((len = inputStream.read(bytes))!=-1){
                            fileOutputStream.write(bytes,0,len);
                        }
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.this, "下载成功", Toast.LENGTH_SHORT).show();
                            }
                        });
                    }
                });
            }
        });

        //分批下载
        fenDownload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Request request = new Request.Builder()
                        .get()
                        .url(get_url)
                        .build();
                client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                    }
                    @Override
                    public void onResponse(Call call, Response response) throws IOException {
                            max = response.body().contentLength();
                            number = max/3;
                            fenpi();

                    }
                });
            }
        });

        //继续上传
        duanUpload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //创建client
                OkHttpClient client = new OkHttpClient.Builder().build();
                //创建请求体
                file = new File("/sdcard/chenjin.mp4");
                final RequestBody requestBody = new RequestBody() {
                    @Override public @Nullable
                    MediaType contentType() {//返回的类型
                        return MediaType.parse("media/mp4");
                    }

                    @Override public long contentLength() {//返回上传文件的大小
                        return file.length()-10000;
                    }

                    @Override public void writeTo(BufferedSink sink) throws IOException {//上传，写数据
                        RandomAccessFile rw = new RandomAccessFile(file, "rw");
                        rw.seek(1500);
                        byte[] bytes =new byte[1024];
                        int len = 0;
                        int count = 1000;
                        while ((len = rw.read(bytes) )!=-1){
                            sink.write(bytes,0,len);
                        }
                    }
                };

                MultipartBody body = new MultipartBody.Builder()
                        .setType(MultipartBody.FORM)
                        .addFormDataPart("file","adsjk.mp4",requestBody)
                        .build();
                Request request = new Request.Builder()
                        .post(body)
                        .url("http://192.168.43.145/hfs/")
                        .build();
                client.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {

                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {

                    }
                });
            }
        });
    }

    private void fenpi() {
        OkHttpClient client1 = new OkHttpClient.Builder().build();
        //1
        final Request request = new Request.Builder()
                .get()
                .url(get_url)
                .header("Range", "bytes = 0 - " + number)
                .build();
            client1.newCall(request).enqueue(new Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                }

                @Override
                public void onResponse(Call call, Response response) throws IOException {
                    InputStream inputStream = response.body().byteStream();
                    RandomAccessFile rw = new RandomAccessFile("/sdcard/chenjin.mp4", "rw");
                    rw.seek(0);
                    int len = 0;
                    byte[] bytes = new byte[1024];
                    while ((len = inputStream.read(bytes))!=-1){
                        rw.write(bytes,0,len);
                    }
                }
            });

            //2
        final Request request2 = new Request.Builder()
                .get()
                .url(get_url)
                .header("Range", "bytes = "+number+" - " + number*2)
                .build();
        client1.newCall(request2).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                InputStream inputStream = response.body().byteStream();
                RandomAccessFile rw = new RandomAccessFile("/sdcard/chenjin.mp4", "rw");
                rw.seek(number);
                int len = 0;
                byte[] bytes = new byte[1024];
                while ((len = inputStream.read(bytes))!=-1){
                    rw.write(bytes,0,len);
                }
            }
        });

        //3
        final Request request3 = new Request.Builder()
                .get()
                .url(get_url)
                .header("Range", "bytes = "+number*2+" - " + max)
                .build();
        client1.newCall(request3).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                InputStream inputStream = response.body().byteStream();
                RandomAccessFile rw = new RandomAccessFile("/sdcard/chenjin.mp4", "rw");
                rw.seek(number*2);
                int len = 0;
                byte[] bytes = new byte[1024];
                while ((len = inputStream.read(bytes))!=-1){
                    rw.write(bytes,0,len);
                }
            }
        });

        handler.post(new Runnable() {
            @Override
            public void run() {
                Toast.makeText(MainActivity.this, "下载成功", Toast.LENGTH_SHORT).show();
            }
        });
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 100 & grantResults[0] == PackageManager.PERMISSION_GRANTED){

        }else{
            finish();
            Toast.makeText(this, "未获得权限", Toast.LENGTH_SHORT).show();
        }
    }
}