关闭java程序,实现主机与客户机的交互.

package_ho mework 11;importjava.io.*;importjava.net.*;public class C lient {public final static int Default_Port=6666;//定义异常信息显示public final static void message(String s{

System.out.println("使用方法:Java C lient"+s;Sys te m.e xit(0;

}public static void main(String args[]{int port=Default_Port;

S ocket s=null;if((ar gs.le ngth!=1&&(ar gs.le ngth!=2message(;if(args.length==1 {port=Default_Port;

}else{try{

port=Inte ger.parseInt(args[1];

}catch(NumberFormatExcep tio n e{message(;

}

}try{

//产生一个Socket ,通过指定的端口与主机通信s=new Socket(args[0],port;

BufferedReader sin=new BufferedReader(new InputStreamReader(s.getInputStream(;

PrintStream sout=new PrintStream(s.getOutputStream(;

BufferedReader in=new BufferedReader(new InputS treamReader(System.in;

//返回连接地址

System.out.println("已连接到:"+s.getInetAddress(+":"+s.getPort(;S tring line;for(; ;{

Sys te m.o ut.pr int(">";

System.out.flush(;

//读信息

line=in.readLine(;if(line==null break;

//把信息发给服务器sout.pr intln(line;line=s in.readLine(;if(line==null{

S ys te m.o ut.pr int ln("服务器已关闭";b re ak;}

Sys te m.o ut.println(line;

}

}catch(IOException e 1{

System.err.println(e1;

}finally{try{if(s !=null s.c lose(;

}catch(IOException e2{

Sys te m.o ut.pr int ln("关闭时出现异常"; }}

}

}

package_ho mework 11;importjava.io.*;importjava.net.*;public class Server extends Thread{public final static int Default_Port=6666;protected int port;protected ServerSocket listen_socket;

//异常处理public static void fail(Exception e,String msg{System.err.println(ms g+":"+e;

Sys te m.e xit(0;

}

//监听客户端的连接请求pub lic Server(int port {if(port==0 port=Default_Port;this.port=port;try{listen_socket=new ServerSocket(port;

}catch(IOException e{

fail(e,"Exception occur in server socket"; }

System.out.println("Server: listening on port"+port; start(;

}

//接收客户端发出的连接请求并产生对象与之对应pub lic vo id run( {try{while(true{

Socket client_socket=listen_socket.accept(;

LinkedList linked=new LinkedList(client_socket;

}

}catch(IOException e{fail(e,"Exception while listening for links";

}

}public static void main(String args[]{int port=0;if(args.length==1 {try{port=Inte ger.parseInt(args[0];

}catch(NumberFormatExcep tio n e{

port=0;

System.out.println("port numb er not input";}

}new Server(port;

}

}package_ho mework 11;importjava.io.*;importjava.net.*;public class LinkedList extends Thread{protected Socket client;protected BufferedReader in;protected PrintStream out;

//启动线程public LinkedList(Socket client_socket {c lient=c lient_socket;try{in=new BufferedReader(

new InputStreamReader(client.getInputStream(;out=new PrintStream(c lie nt.ge tOutp utS tream(;

} catch(IOException e{try{c lient.c lose(;

}catch(IOException e2{

Sys te m.o ut.pr int ln("无法关闭";

}

Sys te m.e rr.println("在S ock et上建立流时出现问题:"+e;re turn;}s tar t(;

}

//服务器读取信息后反转文本并发送pub lic vo id run({

String line="";

StringBuffer revline;int len;try{for(; ;{

line=in.readLine(;if(line==nullbr eak;len=line.length(;revline=new StringBuffer(len;for(int i=len-1;i>=0;i--revline.insert(len-1-i,line.charAt(i;out.p rintln(re vline;

}

}catch(IOException e{

Sys te m.o ut.pr int ln("读取时出现异常";}finally{try{c lient.c lose(;

}catch(IOException e2{

Sys te m.o ut.pr int("关闭时出现异常";}

}

}

}