黑马程序员_java入门_网路编程_02

------- android培训、java培训、期待与您交流! ----------

一.TCP上传图片

客户端

/*
需求:上传图片。
*/

/*
客户端:
1.服务端点。
2.读取客户端已有的图片数据。
3.通过socket输出流将数据发给服务端。
4.读取服务端反馈信息。
5.关闭。
*/
import java.net.*;
import java.io.*;
class PicClient
{
	public static void main(String[] args)throws Exception 
	{
		Socket s=new Socket("172.16.56.237",1005);
		FileInputStream fis=new FileInputStream("e:\\1.jpg");

		OutputStream out=s.getOutputStream();

		byte[] buf=new byte[1024];
		int len=0;

		while((len=fis.read(buf))!=-1)
		{
			out.write(buf,0,len);
		}
		
		s.shutdownOutput();//告诉服务端数据已写完。(增加结束标记)

		InputStream in=s.getInputStream();
		byte[] bufIn=new byte[1024];

		int num=in.read(bufIn);
		System.out.println(new String(bufIn,0,num));

		fis.close();
		s.close();
	}
}

服务端

/*
服务端:
*/
import java.net.*;
import java.io.*;
class PicServer
{
	public static void main(String[] args)throws Exception
	{
		ServerSocket ss=new ServerSocket(1005);
		Socket s=ss.accept();

		InputStream in=s.getInputStream();

		FileOutputStream fos=new FileOutputStream("f:\\server.jpg");

		byte[] buf=new byte[1024];
		int len=0;
		while((len=in.read(buf))!=-1)
		{
			fos.write(buf,0,len);
		}

		OutputStream out=s.getOutputStream();
		out.write("图片已收到".getBytes());

		fos.close();
		s.close();
		ss.close();
	}
}


二.同时多个客户上传图片

class PicThread implements Runnable
{
	private Socket s;
	PicThread(Socket s)
	{
		this.s=s;
	}
	public void run()
	{
		int count=1;

		String ip=s.getInetAddress().getHostAddress();
		try
		{
			
			System.out.println(ip+"..........connceted");

			InputStream in=s.getInputStream();


			//为了不覆盖
			File file=new File("f:\\"+ip+"("+(count)+")"+".jpg");
			while(file.exists())
				file=new File("f:\\"+ip+"("+(count++)+")"+".jpg");



			FileOutputStream fos=new FileOutputStream(file);

			byte[] buf=new byte[1024];
			int len=0;
			while((len=in.read(buf))!=-1)
			{
				fos.write(buf,0,len);
			}

			OutputStream out=s.getOutputStream();
			out.write("图片已收到".getBytes());

			fos.close();
			s.close();
			
		}
		catch (Exception e)
		{
			throw new RuntimeException(ip+"上传失败!");
		}
	}
}
class PicServer
{
	public static void main(String[] args)throws Exception
	{
		ServerSocket ss=new ServerSocket(1005);

		while(true)
		{
			Socket s=ss.accept();
			new Thread(new PicThread(s)).start();
		}
		
	}
}
三.自定义服务端

ServerSocket ss=new ServerSocket(1005);  

Socket s=ss.accpet()

PrintWriter out=new PrintWriter(s.getOutPutStream(),true)

out.println("客服端是我")



四.Tomcat服务端

步骤:1.先运行服务端

2.自定义客户端访问


五.URL用处

/*
通过URLConnection拆封:
*/
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;

class MyIEByGUI
{
	private Frame f;
	private TextField tf;
	private Button but;
	private TextArea ta;

	private Dialog d;
	private Label lab;
	private Button okBut;
	
	MyIEByGUI2()
	{
		init();
	}
	public void init()
	{
		f=new Frame("my window");
		f.setBounds(300,100,600,500);
		f.setLayout(new FlowLayout());

		tf=new TextField(60);
		but=new Button("转到");
		ta=new TextArea(25 ,70);//  行,列


		d=new Dialog(f,"提示信息",true);//第3个参数:指定在显示的时候是否阻止用户将内容输入到其他顶级窗口中。
		d.setBounds(400,200,240,150);
		d.setLayout(new FlowLayout());
		lab=new Label();
		okBut=new Button("确定");
		d.add(lab);
		d.add(okBut);
		
		f.add(tf);
		f.add(but);
		f.add(ta);

		myEvent();

		f.setVisible(true);
	}
	private void myEvent()
	{
		but.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				try
				{
					showDir();
				}
				catch (Exception ee)
				{
					String info="您输入的地址是错误的,请重新输入!";
					lab.setText(info);
					d.setVisible(true);
				}
				
			}
		});

		f.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});

		tf.addKeyListener(new KeyAdapter()
		{
			public void keyPressed(KeyEvent e)
			{	
				try
				{
					if(e.getKeyCode()==KeyEvent.VK_ENTER)
						showDir();
				}
				catch (Exception ee)
				{
					String info="您输入的地址是错误的,请重新输入!";
					lab.setText(info);
					d.setVisible(true);
				}
				
			}
		});
		okBut.addKeyListener(new KeyAdapter()
		{
			public void keyPressed(KeyEvent e)
			{	
				if(e.getKeyCode()==KeyEvent.VK_ENTER)
					d.setVisible(false);
			}
		});

		d.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				d.setVisible(false);
			}
		});
		okBut.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				d.setVisible(false);
			}

		});
	}
	private void showDir()throws Exception
	{   
		ta.setText("");//清空

		String urlPath=tf.getText();//    http://172.16.56.237:8080/myweb/index.html
		
		URL url=new URL(urlPath);

		URLConnection conn=url.openConnection();

		InputStream in=conn.getInputStream();
		byte[] buf=new byte[1024];
		int len=in.read(buf);
		ta.setText(new String(buf,0,len));
	}

	public static void main(String[] args) 
	{
		new MyIEByGUI();
	}
}


ServerSocket(int port,int backlog)

port监听的服务所使用的接口

backlog最大连接数


六.域名解析

省略


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