IO操作

/*建立一个文本转换器：
客户端给服务器发送文本，服务端将文本转换成大写再
返回给客户端，当客户端输入over时，转换结束。

客户端：io,键盘录入
服务端：网络设备 网络输出流
操作的是文本数据 可以选择字符流。

*/
import java.io.*;
import java.net.*;
class TransClient
{
public static void main(String[] args) throws Exception
{
InetAddress in = InetAddress.getLocalHost();
Socket s = new Socket(in.getHostAddress(),10000);
BufferedReader bufr =
new BufferedReader(new InputStreamReader(System.in));
PrintWriter out = new PrintWriter(s.getOutputStream(),true);
//BufferedWriter bufOut =
// new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
BufferedReader bufIn =
new BufferedReader(new InputStreamReader(s.getInputStream()));
String line =null;
String str = null;
while((line=bufr.readLine())!=null)
{
if("over".equals(line))
break;
out.println(line);
//bufOut.write(line);
//bufOut.newLine();
//bufOut.flush();
str = bufIn.readLine();
System.out.println("Server:"+str);
}
bufr.close();
s.close();
}
}
class TransServer
{
public static void main(String[] args) throws Exception
{
ServerSocket ss = new ServerSocket(10000);

Socket s = ss.accept();
String ip = s.getInetAddress().getHostAddress();
System.out.println(ip+".......connected");

BufferedReader bufIn =
new BufferedReader(new InputStreamReader(s.getInputStream()));

PrintWriter out = new PrintWriter(s.getOutputStream(),true);
// BufferedWriter bufOut =
// new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
String line = null;
while((line= bufIn.readLine())!=null)
{
System.out.println(line);
out.println(line.toUpperCase());
//bufOut.write(line.toUpperCase());
//bufOut.newLine();
//bufOut.flush();

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