java读取WEB-INF目录下文件

demo程序代码如下：

java读取WEB-INF目录下文件

HelloServlet.java：

package com.horizon.servlet;



import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



public class HelloServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;



    public HelloServlet() {

        super();

    }



    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String output = "";

        String fileName = request.getSession().getServletContext()

                .getRealPath("/")

                + "WEB-INF/conf/ff.txt";

        fileName = fileName.replace("\\", "/");

        System.out.println(fileName);

        File file = new File(fileName);



        try {

            BufferedReader input = new BufferedReader(new FileReader(file));

            StringBuffer buffer = new StringBuffer();

            String text;



            while ((text = input.readLine()) != null)

                buffer.append(text + "\n");



            output = buffer.toString();

        } catch (IOException ioException) {

            System.err.println("File Error!");

        }

        request.setAttribute("output", output);

        request.getRequestDispatcher("/WEB-INF/jsp/FileDemo.jsp").forward(

                request, response);



    }



    protected void doPost(HttpServletRequest request,

            HttpServletResponse response) throws ServletException, IOException {

        doGet(request, response);

    }



}

web.xml:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

    id="WebApp_ID" version="2.5">

    <display-name>TestServlet</display-name>

    <servlet>

        <description></description>

        <display-name>HelloServlet</display-name>

        <servlet-name>HelloServlet</servlet-name>

        <servlet-class>com.horizon.servlet.HelloServlet</servlet-class>

    </servlet>

    <servlet-mapping>

        <servlet-name>HelloServlet</servlet-name>

        <url-pattern>/HelloServlet</url-pattern>

    </servlet-mapping>

</web-app>

FileDemo.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>FileDemo</title>

</head>

<body>

    <%=request.getAttribute("output")%>

</body>

</html>

访问：http://localhost:8080/TestServlet/HelloServlet

OK！

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