1. import java.io.*;
   
2. import java.util.*;
   
3. 
   
4. public class Testprintstream2{
   
5. public static void main(String[] args){
   
6. String s = null;
   
7. BufferedReader br = new BufferedReader(new  InputStreamReader(System.in));
   
8. try{
   
9. FileWriter fw = new FileWriter("f:/java/filelog.log",true);
   
10. PrintWriter log = new PrintWriter(fw);
    
11. while((s=br.readLine())!=null){
    
12. if(s.equalsIgnoreCase("exit")) break;
    
13. System.out.println(s.toUpperCase());
    
14. log.println("------");
    
15. log.println(s.toUpperCase());
    
16. log.flush();
    
17. }
    
18. log.println("=="+new Date()+"==");
    
19. log.flush();
    
20. log.close();
    
21. }catch(IOException a){
    
22. System.out.println("文件错误");
    
23. }
    
24. }
    
25. }

复制代码

FileWriter fw = new FileWriter("f:/java/filelog.log",true);

f://java//filelog.log

/转义字符

FileWriter fw = new FileWriter("f:/java/filelog.log",true);
路径名的话用//     f://java//filelog.log

路径分隔符应该用\\吧，而且\才是转义字符

第九行代码：FileWriter fw = new FileWriter("f:/java/filelog.log",true);有问题
应改为：09.FileWriter fw = new FileWriter("f:\\java\\filelog.log",true);