Android基础—基于Socket实现上传大文件

上节中我们给大家接触了Socket的一些基本概念以及使用方法，然后写了一个小猪简易聊天室的 Demo，相信大家对Socket有了初步的掌握，本节我们来学习下使用Socket来实现大文件的断点续传！这里讲解的是别人写好的一个Socket上传大文件的例子，不要求我们自己可以写出来，需要的时候会用就好！

1.运行效果图：

1.先把我们编写好的Socket服务端运行起来：

2.将一个音频文件放到SD卡根目录下：

3.运行我们的客户端：

4.上传成功后可以看到我们的服务端的项目下生成一个file的文件夹，我们可以在这里找到上传的文件： .log那个是我们的日志文件

2.实现流程图：

3.代码示例：

先编写一个服务端和客户端都会用到的流解析类：

StreamTool.java：

package com.test;import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;public class StreamTool {public static void save(File file, byte[] data) throws Exception {FileOutputStream outStream = new FileOutputStream(file);outStream.write(data);outStream.close();}public static String readLine(PushbackInputStream in) throws IOException {char buf[] = new char[128];int room = buf.length;int offset = 0;int c;loop: while (true) {switch (c = in.read()) {case -1:case '\n':break loop;case '\r':int c2 = in.read();if ((c2 != '\n') && (c2 != -1))in.unread(c2);break loop;default:if (--room < 0) {char[] lineBuffer = buf;buf = new char[offset + 128];room = buf.length - offset - 1;System.arraycopy(lineBuffer, 0, buf, 0, offset);}buf[offset++] = (char) c;break;}}if ((c == -1) && (offset == 0))return null;return String.copyValueOf(buf, 0, offset);}/*** 读取流* * @param inStream* @return 字节数组* @throws Exception*/public static byte[] readStream(InputStream inStream) throws Exception {ByteArrayOutputStream outSteam = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = -1;while ((len = inStream.read(buffer)) != -1) {outSteam.write(buffer, 0, len);}outSteam.close();inStream.close();return outSteam.toByteArray();}
}

1）服务端的实现：

socket管理与多线程管理类：

FileServer.java：

package com.test;import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import java.io.RandomAccessFile;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;public class FileServer {private ExecutorService executorService;// 线程池private int port;// 监听端口private boolean quit = false;// 退出private ServerSocket server;private Map<Long, FileLog> datas = new HashMap<Long, FileLog>();// 存放断点数据public FileServer(int port) {this.port = port;// 创建线程池，池中具有(cpu个数*50)条线程executorService = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() * 50);}/*** 退出*/public void quit() {this.quit = true;try {server.close();} catch (IOException e) {}}/*** 启动服务* * @throws Exception*/public void start() throws Exception {server = new ServerSocket(port);while (!quit) {try {Socket socket = server.accept();// 为支持多用户并发访问，采用线程池管理每一个用户的连接请求executorService.execute(new SocketTask(socket));} catch (Exception e) {// e.printStackTrace();}}}private final class SocketTask implements Runnable {private Socket socket = null;public SocketTask(Socket socket) {this.socket = socket;}public void run() {try {System.out.println("accepted connection " + socket.getInetAddress() + ":" + socket.getPort());PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());// 得到客户端发来的第一行协议数据：Content-Length=143253434;filename=xxx.3gp;sourceid=// 如果用户初次上传文件，sourceid的值为空。String head = StreamTool.readLine(inStream);System.out.println(head);if (head != null) {// 下面从协议数据中提取各项参数值String[] items = head.split(";");String filelength = items[0].substring(items[0].indexOf("=") + 1);String filename = items[1].substring(items[1].indexOf("=") + 1);String sourceid = items[2].substring(items[2].indexOf("=") + 1);long id = System.currentTimeMillis();// 生产资源id，如果需要唯一性，可以采用UUIDFileLog log = null;if (sourceid != null && !"".equals(sourceid)) {id = Long.valueOf(sourceid);log = find(id);// 查找上传的文件是否存在上传记录}File file = null;int position = 0;if (log == null) {// 如果不存在上传记录,为文件添加跟踪记录String path = new SimpleDateFormat("yyyy/MM/dd/HH/mm").format(new Date());File dir = new File("file/" + path);if (!dir.exists())dir.mkdirs();file = new File(dir, filename);if (file.exists()) {// 如果上传的文件发生重名，然后进行改名filename = filename.substring(0, filename.indexOf(".") - 1) + dir.listFiles().length+ filename.substring(filename.indexOf("."));file = new File(dir, filename);}save(id, file);} else {// 如果存在上传记录,读取已经上传的数据长度file = new File(log.getPath());// 从上传记录中得到文件的路径if (file.exists()) {File logFile = new File(file.getParentFile(), file.getName() + ".log");if (logFile.exists()) {Properties properties = new Properties();properties.load(new FileInputStream(logFile));position = Integer.valueOf(properties.getProperty("length"));// 读取已经上传的数据长度}}}OutputStream outStream = socket.getOutputStream();String response = "sourceid=" + id + ";position=" + position + "\r\n";// 服务器收到客户端的请求信息后，给客户端返回响应信息：sourceid=1274773833264;position=0// sourceid由服务器端生成，唯一标识上传的文件，position指示客户端从文件的什么位置开始上传outStream.write(response.getBytes());RandomAccessFile fileOutStream = new RandomAccessFile(file, "rwd");if (position == 0)fileOutStream.setLength(Integer.valueOf(filelength));// 设置文件长度fileOutStream.seek(position);// 指定从文件的特定位置开始写入数据byte[] buffer = new byte[1024];int len = -1;int length = position;while ((len = inStream.read(buffer)) != -1) {// 从输入流中读取数据写入到文件中fileOutStream.write(buffer, 0, len);length += len;Properties properties = new Properties();properties.put("length", String.valueOf(length));FileOutputStream logFile = new FileOutputStream(new File(file.getParentFile(), file.getName() + ".log"));properties.store(logFile, null);// 实时记录已经接收的文件长度logFile.close();}if (length == fileOutStream.length())delete(id);fileOutStream.close();inStream.close();outStream.close();file = null;}} catch (Exception e) {e.printStackTrace();} finally {try {if (socket != null && !socket.isClosed())socket.close();} catch (IOException e) {}}}}public FileLog find(Long sourceid) {return datas.get(sourceid);}// 保存上传记录public void save(Long id, File saveFile) {// 日后可以改成通过数据库存放datas.put(id, new FileLog(id, saveFile.getAbsolutePath()));}// 当文件上传完毕，删除记录public void delete(long sourceid) {if (datas.containsKey(sourceid))datas.remove(sourceid);}private class FileLog {private Long id;private String path;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getPath() {return path;}public void setPath(String path) {this.path = path;}public FileLog(Long id, String path) {this.id = id;this.path = path;}}}

服务端界面类:ServerWindow.java：

public class ServerWindow extends Frame {private FileServer s = new FileServer(12345);private Label label;public ServerWindow(String title) {super(title);label = new Label();add(label, BorderLayout.PAGE_START);label.setText("服务器已经启动");this.addWindowListener(new WindowListener() {public void windowOpened(WindowEvent e) {new Thread(new Runnable() {public void run() {try {s.start();} catch (Exception e) {// e.printStackTrace();}}}).start();}public void windowIconified(WindowEvent e) {}public void windowDeiconified(WindowEvent e) {}public void windowDeactivated(WindowEvent e) {}public void windowClosing(WindowEvent e) {s.quit();System.exit(0);}public void windowClosed(WindowEvent e) {}public void windowActivated(WindowEvent e) {}});}/*** @param args*/public static void main(String[] args) throws IOException {InetAddress address = InetAddress.getLocalHost();ServerWindow window = new ServerWindow("文件上传服务端：" + address.getHostAddress());window.setSize(400, 300);window.setVisible(true);}}

2）客户端(Android端)

首先是布局文件：activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"android:orientation="vertical"android:padding="5dp"><TextViewandroid:layout_width="fill_parent"android:layout_height="wrap_content"android:text="文件名"android:textSize="18sp" /><EditTextandroid:id="@+id/edit_fname"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="Nikki Jamal - Priceless.mp3" /><Buttonandroid:id="@+id/btn_upload"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="上传" /><Buttonandroid:id="@+id/btn_stop"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="停止" /><ProgressBarandroid:id="@+id/pgbar"style="@android:style/Widget.ProgressBar.Horizontal"android:layout_width="fill_parent"android:layout_height="40px" /><TextViewandroid:id="@+id/txt_result"android:layout_width="fill_parent"android:layout_height="wrap_content"android:gravity="center" />
</LinearLayout>

因为断点续传，我们需要保存上传的进度，我们需要用到数据库，这里我们定义一个数据库管理类：DBOpenHelper.java：

public class DBOpenHelper extends SQLiteOpenHelper {public DBOpenHelper(Context context) {super(context, "jay.db", null, 1);}@Overridepublic void onCreate(SQLiteDatabase db) {db.execSQL("CREATE TABLE IF NOT EXISTS uploadlog (_id integer primary key autoincrement, path varchar(20), sourceid varchar(20))");}@Overridepublic void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {}
}

然后是数据库操作类： UploadHelper.java：

public class UploadHelper {private DBOpenHelper dbOpenHelper;public UploadHelper(Context context) {dbOpenHelper = new DBOpenHelper(context);}public String getBindId(File file) {SQLiteDatabase db = dbOpenHelper.getReadableDatabase();Cursor cursor = db.rawQuery("select sourceid from uploadlog where path=?",new String[] { file.getAbsolutePath() });if (cursor.moveToFirst()) {return cursor.getString(0);}return null;}public void save(String sourceid, File file) {SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("insert into uploadlog(path,sourceid) values(?,?)",new Object[] { file.getAbsolutePath(), sourceid });}public void delete(File file) {SQLiteDatabase db = dbOpenHelper.getWritableDatabase();db.execSQL("delete from uploadlog where path=?", new Object[] { file.getAbsolutePath() });}
}

对了，别忘了客户端也要贴上那个流解析类哦，最后就是我们的MainActivity.java了：

public class MainActivity extends AppCompatActivity implements View.OnClickListener {private EditText edit_fname;private Button btn_upload;private Button btn_stop;private ProgressBar pgbar;private TextView txt_result;private UploadHelper upHelper;private boolean flag = true;private Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) {pgbar.setProgress(msg.getData().getInt("length"));float num = (float) pgbar.getProgress() / (float) pgbar.getMax();int result = (int) (num * 100);txt_result.setText(result + "%");if (pgbar.getProgress() == pgbar.getMax()) {Toast.makeText(MainActivity.this, "上传成功", Toast.LENGTH_SHORT).show();}}};@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);bindViews();upHelper = new UploadHelper(this);}private void bindViews() {edit_fname = (EditText) findViewById(R.id.edit_fname);btn_upload = (Button) findViewById(R.id.btn_upload);btn_stop = (Button) findViewById(R.id.btn_stop);pgbar = (ProgressBar) findViewById(R.id.pgbar);txt_result = (TextView) findViewById(R.id.txt_result);btn_upload.setOnClickListener(this);btn_stop.setOnClickListener(this);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btn_upload:String filename = edit_fname.getText().toString();flag = true;if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {File file = new File(Environment.getExternalStorageDirectory(), filename);if (file.exists()) {pgbar.setMax((int) file.length());uploadFile(file);} else {Toast.makeText(MainActivity.this, "文件并不存在~", Toast.LENGTH_SHORT).show();}} else {Toast.makeText(MainActivity.this, "SD卡不存在或者不可用", Toast.LENGTH_SHORT).show();}break;case R.id.btn_stop:flag = false;break;}}private void uploadFile(final File file) {new Thread(new Runnable() {public void run() {try {String sourceid = upHelper.getBindId(file);Socket socket = new Socket("172.16.2.54", 12345);OutputStream outStream = socket.getOutputStream();String head = "Content-Length=" + file.length() + ";filename=" + file.getName()+ ";sourceid=" + (sourceid != null ? sourceid : "") + "\r\n";outStream.write(head.getBytes());PushbackInputStream inStream = new PushbackInputStream(socket.getInputStream());String response = StreamTool.readLine(inStream);String[] items = response.split(";");String responseSourceid = items[0].substring(items[0].indexOf("=") + 1);String position = items[1].substring(items[1].indexOf("=") + 1);if (sourceid == null) {//如果是第一次上传文件，在数据库中不存在该文件所绑定的资源idupHelper.save(responseSourceid, file);}RandomAccessFile fileOutStream = new RandomAccessFile(file, "r");fileOutStream.seek(Integer.valueOf(position));byte[] buffer = new byte[1024];int len = -1;int length = Integer.valueOf(position);while (flag && (len = fileOutStream.read(buffer)) != -1) {outStream.write(buffer, 0, len);length += len;//累加已经上传的数据长度Message msg = new Message();msg.getData().putInt("length", length);handler.sendMessage(msg);}if (length == file.length()) upHelper.delete(file);fileOutStream.close();outStream.close();inStream.close();socket.close();} catch (Exception e) {Toast.makeText(MainActivity.this, "上传异常~", Toast.LENGTH_SHORT).show();}}}).start();}}

最后，还有，记得往**AndroidManifest.xml**中写入这些权限哦！

<!-- 在SDCard中创建与删除文件权限 -->
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<!-- 往SDCard写入数据权限 -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<!-- 访问internet权限 -->
<uses-permission android:name="android.permission.INTERNET"/>

4.代码下载：

Socket上传大文件demo

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