（1）如何在serlvet中读取文件的内容

package com.tsinghua;

import java.io.*;

import javax.servlet.http.*;

public class ServletFileTest1 extends HttpServlet {

 
 	public void doGet(HttpServletRequest req,HttpServletResponse res){
 				
 		try {
		 		
			//中文乱码
			res.setContentType("text/html;charset=gbk");
			
			PrintWriter pw=res.getWriter();
		 
		 	//创建一个FileReader
			FileReader  f=new FileReader("f:\\myCounter.txt");
			    	
			BufferedReader bw=new BufferedReader(f);
			    	
			 
			 //读出一行数据 或者使用for循环都区全部内容	
			String numVal=bw.readLine();
			 
			 //一定要关闭文件流   	
			bw.close();
			
			pw.println("从文件中读取的数据是:"+numVal);
			
		 
		 }
		 catch (Exception ex) {
		 	
		 	ex.printStackTrace();
		 
		 }
 			
 	}
 	
 	public void doPost(HttpServletRequest req,HttpServletResponse res){
 		
 		this.doGet(req,res);
 	}
    
}

package com.tsinghua;

import java.io.*;

import javax.servlet.http.*;

public class ServletFileTest2 extends HttpServlet {

 
 	public void doGet(HttpServletRequest req,HttpServletResponse res){
 		
 		try {
		 
		 	//中文乱码
			res.setContentType("text/html;charset=gbk");
			
			PrintWriter pw=res.getWriter();
		 
		 	//创建一个FileWriter  看内存数据 ->  磁盘文件(写入,输出)
		 	//看内存数据 <-  磁盘文件(读入,输入)
			FileWriter  f=new FileWriter("f:\\myCounter.txt");
	    	
	    	BufferedWriter bw=new BufferedWriter(f);
	    	
	    	//在文件中写入数据	
	    	bw.write("1");
	    	
	    	//关闭文件流
	    	bw.close();
	    	
	    	pw.println("在文件中写入了数据");
	    	
		 
		 }
		 catch (Exception ex) {
		 	
		 	ex.printStackTrace();
		 
		 }
 			
 	}
 	
 	public void doPost(HttpServletRequest req,HttpServletResponse res){
 		
 		this.doGet(req,res);
 	}
    
}

Servlet对文件的读写操作