counter.java 文件  

package count;
import  java.io.*;  
public  class  counter  extends  Object  {  
           private  String  currentRecord  =null;  
           private  String  path  =null;  
           private  BufferedReader  file;  
 
 
           public  String  ReadFile(String  filePath)  throws  FileNotFoundException  
           {  
                       path  =  filePath;  
                       file  =  new  BufferedReader(new  FileReader(path))            ;  
                       String  returnStr=null;  
                       try  
                       {  
                                   currentRecord  =  file.readLine();  
 
                       }  
                       catch(IOException  e)  
                       {  
                                   System.out.println(e+"读取数据错误");  
 
                       }  
                       if  (currentRecord==null)  
                                   currentRecord="没有记录";  
                       else  
                       {  
                                   returnStr=currentRecord;  
                       }  
                       return  returnStr;  
 
           }  
 
           public  void  WriteFile(String  filePath,String  counter)  throws  FileNotFoundException  
           {  
                       path  =  filePath;  
                       int  Writerstr  =Integer.parseInt(counter)+1;  
 
                       try  
                       {  
                                   //?????  
                                   //PrintWriter  pw  =  new  PrintWriter(new  FileOutputStream(filePath));  
                                   PrintWriter  pw  =  new  PrintWriter(new  FileOutputStream(path));  
                                   pw.println(Writerstr);  
                                   pw.close();  
                       }  
                       catch(IOException  e)  
                       {  
                                   System.out.println(e+"写入文件错误");  
                       }  
 
           }  
 
 
}  
 
test.jsp文件













工作目录是路径
test/test.jsp
test/web-inf/class/count/counter.class
test/web-inf/class/count/count.txt


以上代码运行正确！
我现在有几个问题要问

1：为什么在代码中打了问号的位置
    PrintWriter  pw  =  new  PrintWriter(new  FileOutputStream(filePath));  
    代替：PrintWriter  pw  =  new  PrintWriter(new  FileOutputStream(path));  
     编译通不过

2：count.txt 为什么要放在test/web-inf/class/count 下，按我的理解它应该和TEST。JSP在一个目录下

3：test.jsp中



request为什么不能改为application


4：如果我在counter.java 中我不 要这条语句package cout;编译后

test.jsp中改为




工作目录的相应路径改为
test/test.jsp
test/web-inf/class/counter.class
test/web-inf/class/count.txt

运行时
这句报错
说找不到
counter.class

 

up下