import java.io.*;
////代码//// 
public class ColligationIO { 
  public static void main(String args[]) throws Exception { 
   OutputStreamWriter osw = new OutputStreamWriter(
           new FileOutputStream( 
   "d:\\test\\test1.txt")); 
   InputStreamReader isr = new InputStreamReader(System.in); 
   BufferedReader br = new BufferedReader(isr); 
   String read = null; 
 
   while ( (read=br.readLine()) != null) { 
   if (read.trim().length() > 0) { 
   if (read.equalsIgnoreCase("exit"))
    {
     osw.close(); 
     return; 
    }
   osw.write(read);
   osw.flush();
}//if 
}//while 
}//main 
} //class

------解决方案--------------------

Java code

package csdn;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;


public class ColligationIO { 
    public static void main(String args[]) throws IOException { 
        OutputStreamWriter osw =null;
        BufferedReader br = null;
        try {
            osw = new OutputStreamWriter(new FileOutputStream( 
            "e:\\test\\test1.txt")); 
            InputStreamReader isr = new InputStreamReader(System.in); 
            br = new BufferedReader(isr); 
            String read =null;
            while (true) { 
                read = br.readLine(); 
                if (read.trim().length() > 0) { 
                    if (read.equalsIgnoreCase("exit")) 
                        break; 
                    osw.write(read+"\r\n");     
                    osw.flush(); 
                }
            } 
        }finally {
            if(br!=null)
            br.close();
            if(osw!=null)
            osw.close();
        }
    } 
}