羊皮书APP（Android版）开发系列（十二）Android Socket UDP大文件传输

来源：互联网发布：c语言将字符转换为数字编辑：程序博客网时间：2024/05/22 04:25

业务需求是：通过电脑端（网页或客户端形式）发送文件到Android的客户端，下面是使用UDP实现的一个简单的文件传输Demo，因UDP为不可靠传输，可能会丢包。

服务器端发送本地文件，代码如下：

package client;import server.udp.UDPUtils;import java.io.IOException;import java.io.RandomAccessFile;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.InetSocketAddress;public class UDPClient {    private static final String SEND_FILE_PATH = "/Users/wangjie/Documents/123.mp4";    public static void main(String[] args){        long startTime = System.currentTimeMillis();        byte[] buf = new byte[UDPUtils.BUFFER_SIZE];        byte[] receiveBuf = new byte[1];        RandomAccessFile accessFile = null;        DatagramPacket dpk = null;        DatagramSocket dsk = null;        int readSize = -1;        try {            accessFile = new RandomAccessFile(SEND_FILE_PATH,"r");//            dpk = new DatagramPacket(buf, buf.length,new InetSocketAddress(InetAddress.getByName("localhost"), UDPUtils.PORT + 1));            dpk = new DatagramPacket(buf, buf.length,new InetSocketAddress(InetAddress.getByName("192.168.1.119"), UDPUtils.PORT + 1));            dsk = new DatagramSocket(UDPUtils.PORT);            int sendCount = 0;            while((readSize = accessFile.read(buf,0,buf.length)) != -1){                System.out.println("readSize:"+readSize);                dpk.setData(buf, 0, readSize);                dsk.send(dpk);                // wait server response                {                    while(true){                        dpk.setData(receiveBuf, 0, receiveBuf.length);                        dsk.receive(dpk);                        // confirm server receive                        if(!UDPUtils.isEqualsByteArray(UDPUtils.successData,receiveBuf,dpk.getLength())){                            System.out.println("resend ...");                            dpk.setData(buf, 0, readSize);                            dsk.send(dpk);                        }else                            break;                    }                }                System.out.println("send count of "+(++sendCount)+"!");            }            // send exit wait server response            while(true){                System.out.println("client send exit message ....");                dpk.setData(UDPUtils.exitData,0,UDPUtils.exitData.length);                dsk.send(dpk);                dpk.setData(receiveBuf,0,receiveBuf.length);                dsk.receive(dpk);                // byte[] receiveData = dpk.getData();                if(!UDPUtils.isEqualsByteArray(UDPUtils.exitData, receiveBuf, dpk.getLength())){                    System.out.println("client Resend exit message ....");                    dsk.send(dpk);                }else                    break;            }        }catch (Exception e) {            e.printStackTrace();        } finally{            try {                if(accessFile != null)                    accessFile.close();                if(dsk != null)                    dsk.close();            } catch (IOException e) {                e.printStackTrace();            }        }        long endTime = System.currentTimeMillis();        System.out.println("time:"+(endTime - startTime));    }}

客户端接收文件存到本地，代码如下：

package cn.studyou.androidsocket;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.net.DatagramPacket;import java.net.DatagramSocket;import java.net.InetAddress;import java.net.InetSocketAddress;public class UDPReceiveFileActivity extends Activity {    private String localUrl;    private static final String FILE_DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + "/VideoCache/";    private static final String SAVE_FILE_PATH = Environment.getExternalStorageDirectory().getAbsolutePath() + "/VideoCache/";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_udpfile_mplayer);        Log.e("FILE_DIR", FILE_DIR);        new Thread(new Runnable() {            @Override            public void run() {                receiveFile();            }        }).start();    }    public void receiveFile() {        byte[] buf = new byte[UDPUtils.BUFFER_SIZE];        DatagramPacket dpk = null;        DatagramSocket dsk = null;        BufferedOutputStream bos = null;        try {            InetAddress loc = InetAddress.getByName("192.168.1.107");            dpk = new DatagramPacket(buf, buf.length, new InetSocketAddress(loc, UDPUtils.PORT));            dsk = new DatagramSocket(UDPUtils.PORT + 1);            if (localUrl == null) {                localUrl = SAVE_FILE_PATH + "1235.mp4";            }            File cacheFile = new File(localUrl);            if (!cacheFile.exists()) {                cacheFile.getParentFile().mkdirs();                cacheFile.createNewFile();            }            bos = new BufferedOutputStream(new FileOutputStream(localUrl));            System.out.println("wait client ....");            dsk.receive(dpk);            System.out.println("wait clientq ....");            int readSize = 0;            int readCount = 0;            int flushSize = 0;            while ((readSize = dpk.getLength()) != 0) {                // validate client send exit flag                if (UDPUtils.isEqualsByteArray(UDPUtils.exitData, buf, readSize)) {                    System.out.println("server exit ...");                    // send exit flag                    dpk.setData(UDPUtils.exitData, 0, UDPUtils.exitData.length);                    dsk.send(dpk);                    break;                }                bos.write(buf, 0, readSize);                if (++flushSize % 1000 == 0) {                    flushSize = 0;                    bos.flush();                }                dpk.setData(UDPUtils.successData, 0, UDPUtils.successData.length);                dsk.send(dpk);                dpk.setData(buf, 0, buf.length);                System.out.println("receive count of " + (++readCount) + " !");                dsk.receive(dpk);            }            // last flush            bos.flush();        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (bos != null)                    bos.close();                if (dsk != null)                    dsk.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }}

原文地址：http://blog.csdn.net/wjwj1203/article/details/50910873
我的github地址：https://github.com/wjie2014
我的博客地址：http://blog.studyou.cn/
我的CSDN博客地址：http://blog.csdn.net/wjwj1203
我的Gmail邮箱：w489657152@gmail.com

0 0