day25.java

网络编程

模拟web服务器

文件上传

代码如下：

package Demo01FileUpload;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class TcpClient {
public static void main(String[] args) throws IOException {
FileInputStream fis=new FileInputStream(“C:\du\yu.yu.jpg”);

	Socket socket =new Socket("127.0.0.1",8888);
	OutputStream os=socket.getOutputStream();
	int len=0;
	byte[] bytes=new byte[1024];
	while((len=fis.read(bytes))!=-1) {
		os.write(bytes,0,len);
	}
	//告诉服务器，文件已经发送完毕
	socket.shutdownOutput();
	
	InputStream is=socket.getInputStream();
	
	while((len=is.read(bytes))!=-1) {
		System.out.println(new String(bytes,0,len));
	}
	//释放资源
	fis.close();
	socket.close();
}

}

![在这里插入图片描述](https://img-blog.csdnimg.cn/20210616121853804.png)


package Demo01FileUpload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;

public class TcpServer {
	public static void main(String[] args) throws IOException {
		//1、创建一个服务器的serversocket 对象
		ServerSocket server= new ServerSocket(8888);
		
		//2、等待客户端连接
		Socket socket=server.accept();
		
		InputStream is=socket.getInputStream();
		//
		File file= new File("D:\\tst");
		if(!file.exists()) {
			file.mkdirs();
		}
		FileOutputStream fos=new FileOutputStream(file+"\\1.jfif");
		
		int len=0;
		byte[] bytes=new byte[1024];
		
		while((len=is.read(bytes))!=-1) {
			fos.write(bytes,0,len);
			
		}
		
		
		socket.getOutputStream().write("图片上传成功".getBytes());
		fos.close();
		socket.close();
		server.close();
		
	}

}

![在这里插入图片描述](https://img-blog.csdnimg.cn/20210616121858142.png)

优化：

package Demo02FileUpload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Random;

public class TcpServer {
    
    
	public static void main(String[] args) throws IOException {
    
    
		//1、创建一个服务器的serversocket 对象
		ServerSocket server= new ServerSocket(8887);
		while(true) {
    
    
			Socket socket=server.accept();
			new Thread (new Runnable() {
    
    
				public void run() {
    
    
					try {
    
    
						InputStream is=socket.getInputStream();
						
						File file= new File("D:\\tst");
						if(!file.exists()) {
    
    
							file.mkdirs();
						}
						String fileName="classFive"+System.currentTimeMillis()+new Random().nextInt(99999)+".jfif";
						FileOutputStream fos=new FileOutputStream(file+"\\"+fileName);
						
						int len=0;
						byte[] bytes=new byte[1024];
						
						while((len=is.read(bytes))!=-1) {
    
    
							fos.write(bytes,0,len);	
						}
						
						
						socket.getOutputStream().write("图片上传成功".getBytes());
						fos.close();
		//2、等待客户端连接
		
		
	}catch(IOException e) {
    
    
		System.out.println(e);
	}

}
	
		}).start();
	}
}
}

package Demo02FileUpload;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;


public class TcpClient {
    
    
	public static void main(String[] args) throws IOException {
    
    
		FileInputStream fis=new FileInputStream("C:\\du\\yu.yu.jpg");
		
		Socket socket =new Socket("127.0.0.1",8887);
		OutputStream os=socket.getOutputStream();
		int len=0;
		byte[] bytes=new byte[1024];
		while((len=fis.read(bytes))!=-1) {
    
    
			os.write(bytes,0,len);
		}
		//告诉服务器，文件已经发送完毕
		socket.shutdownOutput();
		
		InputStream is=socket.getInputStream();
		
		while((len=is.read(bytes))!=-1) {
    
    
			System.out.println(new String(bytes,0,len));
		}
		//释放资源
		fis.close();
		socket.close();
	}

}

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