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Java在Client/Server网络中的应用(2) |
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作者：未知 来源：未知 加入时间：2005-12-15 人气：143 |
三、编写服务器类Java程序
// Server.java
import java.io.*;
import java.net.*;
public class Server extends Thread
{
public final static int Default_Port=6543;
protectd int port;
protectd ServerSockt listen_socket;
// 定义出错例程：如果出现异常错误，退出程序。
Public static void fail(Exception e, String msg)
{
System.err.println(msg + ": " + e);
System.exit(1);
}
// 定义并启动服务器的Socket 例程，监听客户机的连接请求。
public Server(int port)
{
if(port == 0) port = Default_Port;
this.port = port;
try
{
listen_socket = new ServerSocket(port);
}
catch(IOException e) fail(e, "Exception creating server socket");
System.out.println("Server: listening on port" + port);
This.start();
}
/* 下面为服务器监听线程的主程序。该线程一直循环执行，监听并接受客户机发出的连接
请求。对每一个连接，均产生一个连接对象与之对应，通过Socket 通道进行通信。*/
public void run()
{
try
{
while(true)
{
Socket client_socket = listen_socket.accept();
Connection c = new Connection(client_socket);
}
}
catch(IOException e) fail(e,"Exception while listening for connections")
}
// 启动服务器主程序
public static void main(String args[])
{
int port = 0;
if (args.length == 1)
{
try port = Integer.parseInt(args[0]);
catch(NumberFormatException e) port = 0;
}
new Server(port);
// End of the main
} // End of Server class
//以下定义了Connection 类，它是用来处理与客户机的所有通信的线程。
class Connection extends Thread
{
protected Socket client;
protected DataInputStream in;
protected PrintStream out;
// 初始化通信流并启动线程
public Connection(Socket client_socket)
{
client = client_socket;
try
{
in = new DataInputStream(client.getinputStream());
out = new PrintStream(client.getOutputStream());
}
catch(IOException e)
{
try client.close();
catch(IOException e2);
System.err.println("Exception while getting socket streram: " + e);
Return;
}
this.start;
} // End of Connection method
// 服务例程：读出一行文本；反转文本；返回文本。
public void run()
{
String line;
StringBuffer revline;
int len;
try
{
for(;;)
{
// Read a line
line = in.readline();
if(line == null) break;
// Reverse the line
len = line.length();
revline = new StringBuffer(len);
for(int i = len-1; i > =0; i--)
revline.insert(len-1-I;line.charAt(i));
// Write out the reverse line
out.println(revline);
}
catch(IOException e);
finally try client.close();
catch(IOException e2);
}
// End of run method
}
// End of Connection class
3、编写客户机类Java 程序
// Client.java
import java.io.*;
import java.net.*;
public class Client extends
{
public static final int Default_Port = 6543;
// 定义出错例程
public static final void usage()
{
System.out.println("Usage: Java Client []");
System.exit(0);
}
public static void main(String args[])
{
int port = Default_Port;
Socket s = null;
// 解析端口参数
if ((args.length != 1)&&(args.length != 2 )) usage();
if (args.length == 1)
port = Default_Port;
else
{
try port = Integer.parseInt(args[1]);
catch(NumberFormaatException e) usage();
}
try{
// 产生一个Socket ，通过指定的端口与主机通信。
s = new Socket(args[0], port);
// 产生用于发出和接收的文本字符流
DataInputStream sin = new DataInputStream(s.getInputStream());
PrintStream sout = new DataInputStream(s.getInputStream());
// 从控制台读入字符流
DataInputStream in = new DataInputStream(System.in);
// 返回连接的地址和端口
ystem.out.println("Connected to"+s.getInetAddress()+":"+ s.getPort());
String line;
For(;;)
{
// 显示提示符
System.out.print(" > ");
System.out.flush();
// 读入控制台输入的一行字符
line = in.readline();
if (line == null) break;
// 将接收的文本行送至服务器
sout.println(line);
// 从服务器接收一行字符
line = sin.readline();
// Check if connection is closed(i.e. for EOF)
if(line == null)
{
System.out.println("Connection closed by server.");
Break;
}
// 在控制台上显示接收的字符
System.out.println(line);
}
// End of for loop
}
// End of try
catch(IOException e ) System.err.println(e);
// Always be sure to close the socket
finally
{
try if(s != null) s.close();
catch(IOException e2);
}
} // End of main
} // End of Client
运行该客户机程序时，必须以服务器主机名作为第一个参数，服务器端口号为第二个参数，其中服务器端口号可缺省。
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