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 {

ffe3
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UUID
FileLog 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">

<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="文件名"
android:textSize="18sp" />

<EditText
android:id="@+id/edit_fname"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Nikki Jamal - Priceless.mp3" />

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

<Button
android:id="@+id/btn_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止" />

<ProgressBar
android:id="@+id/pgbar"
style="@android:style/Widget.ProgressBar.Horizontal"
android:layout_width="fill_parent"
android:layout_height="40px" />

<TextView
android: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);
}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE IF NOT EXISTS uploadlog (_id integer primary key autoincrement, path varchar(20), sourceid varchar(20))");
}

@Override
public 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() {
@Override
public 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();
}
}
};

@Override
public 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);
}

@Override
public 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id
upHelper.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