本文是根据tomcat平台下实现而做，文件目录为：

tom_home\webapps\news下: └html └web-inf └classes     └com       └fileman.class       └fileservlet.class  └web.xml

接着我们先实现servlet:fileservlet .java

/*
 * fileservlet.java
 *
 * created on 2005年6月19日, 下午3:03
 */

package com;

import java.io.*;
import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.pagecontext;

/**
 *
 * @author  淘特网
 * @version
 */
public class fileservlet extends httpservlet {
   
    servletcontext sc;
    /** initializes the servlet.
     */
    public void init(servletconfig config) throws servletexception {
        super.init(config);
        sc=config.getservletcontext();
       
    }
   
    /** destroys the servlet.
     */
    public void destroy() {
       
    }
   
    /** processes requests for both http get and post methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processrequest(httpservletrequest request, httpservletresponse response)
    throws servletexception, ioexception {
        response.setcontenttype("text/html");
        printwriter out = response.getwriter();
        //* todo output your page here
        out.println("");
        out.println("");
        out.println("");
        out.println("");
        out.println("");
        out.println("hello");
        out.println(sc.getrealpath("/"));
        fileman fm=new fileman();
 try
 {
 fm.writefile(sc.getrealpath("/")+"/html/test.htm","asf");
 out.println(fm.readfile(sc.getrealpath("/")+"/html/test.htm"));
 }
 catch(filenotfoundexception e){}
        out.println("");
        out.println("");
        // */
        out.close();
    }
   
    /** handles the http get method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doget(httpservletrequest request, httpservletresponse response)
    throws servletexception, ioexception {
        processrequest(request, response);
    }
   
    /** handles the http post method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void dopost(httpservletrequest request, httpservletresponse response)
    throws servletexception, ioexception {
        processrequest(request, response);
    }
   
    /** returns a short description of the servlet.
     */
    public string getservletinfo() {
        return "short description";
    }
   
}

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