多线程下载httpurlConnection

MainActivity中的代码package com.weektwopractise;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import com.weektwopractise.MoreXCDownload.DialogUtils;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        DialogUtils.ShowUpdateProgress(this);    }}进度框的工具类代码
package com.weektwopractise.MoreXCDownload;import android.annotation.SuppressLint;import android.app.ProgressDialog;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.net.Uri;import android.os.AsyncTask;import android.os.SystemClock;import android.support.v7.app.AlertDialog;import android.util.Log;import java.io.File;import java.io.IOException;/** * User: Moyuchen * Date: 2017-11-11 09:23 * Description： */public class DialogUtils {    public static int MAX=0;    public static int PROGRESS=-2;    public static void ShowUpdateProgress(final Context context){        AlertDialog builder=new AlertDialog.Builder(context)                .setTitle("版本有点低，请选择更新最新版本")                .setPositiveButton("更新", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialogInterface, int i) {                        new DownloadThread("http://169.254.35.159:8080/wyq/jinritoutiao_460.apk",context.getCacheDir()+"/d.apk",4).start();                        showDownProgress(context,context.getCacheDir()+"/d.apk");                    }                })                .setNegativeButton("不用了",null)                .show();    }    private static void showDownProgress(final Context context, final String fileurl) {        final ProgressDialog dialog=new ProgressDialog(context);        dialog.setTitle("正在更新");        dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);        dialog.setMax(100);        dialog.show();        new AsyncTask<String, Integer, String>() {            @SuppressLint("LongLogTag")            @Override            protected String doInBackground(String... strings) {                Log.i("==========DialogUtils========", "doInBackground:+Progress: "+PROGRESS+"Max:"+MAX);                while (PROGRESS<MAX) {                    Log.i("==========DialogUtils========", "doInBackground:+Progress: "+PROGRESS+"Max:"+MAX);                    SystemClock.sleep(100);                    if (MAX > 0) {                        publishProgress((int) (PROGRESS * 100 / MAX));                    } else {                        publishProgress(0);                    }                }                return null;            }            @Override            protected void onPostExecute(String s) {                super.onPostExecute(s);                dialog.dismiss();                File file=new File(fileurl);                //重新给下载的文件设置权限                String[] command = {"chmod", "777", file.getPath() };                ProcessBuilder builder = new ProcessBuilder(command);                try {                    builder.start();                } catch (IOException e) {                    e.printStackTrace();                }                //设置跳转到系统安装页面                Intent intent = new Intent(Intent.ACTION_VIEW);                intent.addCategory(Intent.CATEGORY_DEFAULT);                intent.setDataAndType(Uri.parse("file://"+fileurl),"application/vnd.android.package-archive");                context.startActivity(intent);            }            @Override            protected void onProgressUpdate(Integer... values) {                super.onProgressUpdate(values);                dialog.setProgress(values[0]);            }        }.execute();    }}
下载线程中的代码
package com.weektwopractise.MoreXCDownload;import android.annotation.SuppressLint;import android.util.Log;/** * User: Moyuchen * Date: 2017-11-11 08:42 * Description： */public class DownloadThread extends Thread{    private String downUrl="";    private int ThreadNum=5;    private String path;    public DownloadThread(String downUrl,String path,int threadNum){        this.downUrl=downUrl;        this.path=path;        this.ThreadNum=threadNum;    }    @SuppressLint("LongLogTag")    @Override    public void run() {        super.run();        //获取要下载文件的长度，即大小        int fileLength = NetUtils.getFileContentLength(downUrl);        DialogUtils.MAX=fileLength;        Log.i("=============DownLoadThread===============", "fileLength: "+fileLength);        int DownSize=fileLength/ThreadNum;        for (int i=0;i<ThreadNum;i++){            int startPosition=i*DownSize;            if (i==ThreadNum-1) {                DownSize=fileLength-DownSize*(ThreadNum-1);            }            new DownTask(DownSize,downUrl,startPosition,path).start();        }    }}
下载任务中的代码
package com.weektwopractise.MoreXCDownload;/** * User: Moyuchen * Date: 2017-11-11 09:00 * Description： */public class DownTask extends Thread {    private int DownSize;    private String DownUrl;    private int startPosition;    private String path;    public DownTask(int downSize, String downUrl, int startPosition, String path) {        DownSize = downSize;        DownUrl = downUrl;        this.startPosition = startPosition;        this.path = path;    }    @Override    public void run() {        super.run();       NetUtils.DownLoad(DownUrl,DownSize,path,startPosition);    }}
网络下载类中的代码
package com.weektwopractise.MoreXCDownload;import java.io.BufferedInputStream;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;import java.net.HttpURLConnection;import java.net.URL;/** * User: Moyuchen * Date: 2017-11-11 08:49 * Description： */public class NetUtils {    /**     * 获取要下的文件的长度     * @param downloadUrl     * @return     */    public static int getFileContentLength(String downloadUrl){        int contentLength=0;        try {            URL url=new URL(downloadUrl);            HttpURLConnection con = (HttpURLConnection) url.openConnection();            con.setConnectTimeout(5000);            con.setConnectTimeout(5000);            //获取下载的长度           contentLength = con.getContentLength();        } catch (Exception e) {            e.printStackTrace();        }        return  contentLength;    }    public static void DownLoad(String downUrl,int DownSize,String path,int startPosition){        BufferedInputStream buffer = null;        RandomAccessFile raf = null;        try {            File file=new File(path);            if (!file.exists()) {                file.createNewFile();            }            URL url=new URL(downUrl);            HttpURLConnection con = (HttpURLConnection) url.openConnection();            con.setConnectTimeout(5000);            con.setReadTimeout(5000);            if (DownSize>0) {                int endPosition=DownSize+startPosition-1;                con.setRequestProperty("Range","bytes="+startPosition+"-"+endPosition);            }            int responseCode = con.getResponseCode();//获取响应码            if (400>responseCode) {                buffer = new BufferedInputStream(con.getInputStream());                raf = new RandomAccessFile(file, "rwd");                raf.seek(startPosition);                int len=0;                byte[] bytes=new byte[1024*8];                while ((len=buffer.read(bytes))!=-1){                    synchronized (NetUtils.class){                        raf.write(bytes,0,len);                        if (DialogUtils.PROGRESS<0) {                            DialogUtils.PROGRESS=0;                        }                        DialogUtils.PROGRESS+=len;                    }                }            }        } catch (Exception e) {            e.printStackTrace();        }finally {            if (buffer!=null) {                try {                    buffer.close();                } catch (IOException e) {                    e.printStackTrace();                }            }            if (raf!=null) {                try {                    raf.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }    }}
最后设置权限
<uses-permission android:name="android.permission.INTERNET"/>//网络权限<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>//SD卡读写权限<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>