练习四:文件名重复
public class UUIDTest { public static void main(String[] args) { String str = UUID.randomUUID().toString().replace("-", ""); System.out.println(str);//9f15b8c356c54f55bfcb0ee3023fce8a } } ```public class Client {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//1. 创建Socket对象,并连接服务器Socket socket = new Socket("127.0.0.1",10000);
//2.读取本地文件中的数据,并写到服务器当中BufferedInputStream bis = new BufferedInputStream(new FileInputStream("mysocketnet\\clientdir\\a.jpg"));BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());byte[] bytes = new byte[1024];int len;while ((len = bis.read(bytes)) != -1){bos.write(bytes,0,len);}
//往服务器写出结束标记socket.shutdownOutput();
//3.接收服务器的回写数据BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));String line = br.readLine();System.out.println(line);
//4.释放资源socket.close();
}
}
public class Server {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//1.创建对象并绑定端口ServerSocket ss = new ServerSocket(10000);
//2.等待客户端来连接Socket socket = ss.accept();
//3.读取数据并保存到本地文件中BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());String name = UUID.randomUUID().toString().replace("-", "");BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("mysocketnet\\serverdir\\" + name + ".jpg"));int len;byte[] bytes = new byte[1024];while ((len = bis.read(bytes)) != -1) {bos.write(bytes, 0, len);}bos.close();//4.回写数据BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));bw.write("上传成功");bw.newLine();bw.flush();
//5.释放资源socket.close();ss.close();}
}
练习五:服务器改写为多线程
服务器只能处理一个客户端请求,接收完一个图片之后,服务器就关闭了。
优化方案一:
使用循环
弊端:
第一个用户正在上传数据,第二个用户就来访问了,此时第二个用户是无法成功上传的。
所以,使用多线程改进
优化方案二:
每来一个用户,就开启多线程处理
public class Client {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//1. 创建Socket对象,并连接服务器Socket socket = new Socket("127.0.0.1",10000);
//2.读取本地文件中的数据,并写到服务器当中BufferedInputStream bis = new BufferedInputStream(new FileInputStream("mysocketnet\\clientdir\\a.jpg"));BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());byte[] bytes = new byte[1024];int len;while ((len = bis.read(bytes)) != -1){bos.write(bytes,0,len);}
//往服务器写出结束标记socket.shutdownOutput();
//3.接收服务器的回写数据BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));String line = br.readLine();System.out.println(line);
//4.释放资源socket.close();
}
}
public class Server {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//1.创建对象并绑定端口ServerSocket ss = new ServerSocket(10000);
while (true) {//2.等待客户端来连接Socket socket = ss.accept();
//开启一条线程//一个用户就对应服务端的一条线程new Thread(new MyRunnable(socket)).start();}
}
}
public class MyRunnable implements Runnable{
Socket socket;
public MyRunnable(Socket socket){this.socket = socket;}
@Overridepublic void run() {try {//3.读取数据并保存到本地文件中BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());String name = UUID.randomUUID().toString().replace("-", "");BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("mysocketnet\\serverdir\\" + name + ".jpg"));int len;byte[] bytes = new byte[1024];while ((len = bis.read(bytes)) != -1) {bos.write(bytes, 0, len);}bos.close();//4.回写数据BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));bw.write("上传成功");bw.newLine();bw.flush();} catch (IOException e) {e.printStackTrace();} finally {//5.释放资源if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}
}
练习六:线程池改进
public class Client {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//1. 创建Socket对象,并连接服务器Socket socket = new Socket("127.0.0.1",10000);
//2.读取本地文件中的数据,并写到服务器当中BufferedInputStream bis = new BufferedInputStream(new FileInputStream("mysocketnet\\clientdir\\a.jpg"));BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());byte[] bytes = new byte[1024];int len;while ((len = bis.read(bytes)) != -1){bos.write(bytes,0,len);}
//往服务器写出结束标记socket.shutdownOutput();
//3.接收服务器的回写数据BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));String line = br.readLine();System.out.println(line);
//4.释放资源socket.close();
}
}
public class Server {public static void main(String[] args) throws IOException {//客户端:将本地文件上传到服务器。接收服务器的反馈。//服务器:接收客户端上传的文件,上传完毕之后给出反馈。
//创建线程池对象ThreadPoolExecutor pool = new ThreadPoolExecutor(3,//核心线程数量16,//线程池总大小60,//空闲时间TimeUnit.SECONDS,//空闲时间(单位)new ArrayBlockingQueue<>(2),//队列Executors.defaultThreadFactory(),//线程工厂,让线程池如何创建线程对象new ThreadPoolExecutor.AbortPolicy()//阻塞队列);
//1.创建对象并绑定端口ServerSocket ss = new ServerSocket(10000);
while (true) {//2.等待客户端来连接Socket socket = ss.accept();
//开启一条线程//一个用户就对应服务端的一条线程//new Thread(new MyRunnable(socket)).start();pool.submit(new MyRunnable(socket));}
}
}
public class MyRunnable implements Runnable{
Socket socket;
public MyRunnable(Socket socket){this.socket = socket;}
@Overridepublic void run() {try {//3.读取数据并保存到本地文件中BufferedInputStream bis = new BufferedInputStream(socket.getInputStream());String name = UUID.randomUUID().toString().replace("-", "");BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("mysocketnet\\serverdir\\" + name + ".jpg"));int len;byte[] bytes = new byte[1024];while ((len = bis.read(bytes)) != -1) {bos.write(bytes, 0, len);}bos.close();//4.回写数据BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));bw.write("上传成功");bw.newLine();bw.flush();} catch (IOException e) {e.printStackTrace();} finally {//5.释放资源if(socket != null){try {socket.close();} catch (IOException e) {e.printStackTrace();}}}}
}