ServletContext实现转发和读取Properties配置文件

在Servlet开发中，一般很少使用Servlet输出数据，所以需要转发机制实现Servlet向JSp等等的转发，使用Servletontext就能完成这个功能，代码如下

[java] view
plaincopyprint?

package com.bird.servlet;

import java.io.IOException;

/**

* @use 使用ServletContext实现请求的转移

* @author Bird

*/

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletDemo5 extends HttpServlet {

private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

String data = "aaaaaaaa";

//数据带给JSP

this.getServletContext().setAttribute("data", data);

RequestDispatcher re = this.getServletContext().getRequestDispatcher("/1.jsp");//转发对象

re.forward(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

}

下面的代码为使用ServletContext实现对Properties文件的读取和输出，先把配置文件的内容写出来

[html] view
plaincopyprint?

url=jdbc:mysql://localhost:3306/test

username=root

password=root

代码如下

[java] view
plaincopyprint?

package com.bird.servlet;

import java.io.IOException;

import java.io.InputStream;

import java.util.Properties;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletDemo6 extends HttpServlet {

/**

* @use 使用Servlet读取配置文件信息

* @author Bird

*/

private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

//读取配置文件信息，其中配置文件为Properties

InputStream in = this.getServletContext().getResourceAsStream("/WEB-INF/classes/db.properties");

Properties pro = new Properties();

pro.load(in);

String url = pro.getProperty("url");

String username = pro.getProperty("username");

String password = pro.getProperty("password");

System.out.println(url);

System.out.println(username);

System.out.println(password);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

}

}

一定要注意路径的问题。。。。。