java读取WEB-INF目录下文件

demo程序代码如下：

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！

posted @ 2013-01-26 14:58  horizon~~~  阅读(11573)  评论(0)  编辑  收藏  举报