Servlet获取初始化参数

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java

Servlet 参数

一获取初始化参数

在web.xml中配置Servlet时，可以配置一些初始化参数。

而在Servlet中可以通过ServletConfig接口提供方法来取得这些参数。

二界面

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<h1>获取初始化参数演示案例</h1>

<hr>

<a href="servlet/GetInitParameterServlet">获取初始化参数Servlet</a>

</body>

</html>

三配置文件

<?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"; version="2.5">

<display-name></display-name>

<description>This is the description of my J2EE component</description>

<display-name>This is the display name of my J2EE component</display-name>

<servlet-name>GetInitParameterServlet</servlet-name>

<servlet-class>servlet.GetInitParameterServlet</servlet-class>

<init-param>

<param-name>username</param-name>

<param-value>admin</param-value>

</init-param>

<init-param>

<param-name>password</param-name>

<param-value>123456</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>GetInitParameterServlet</servlet-name>

<url-pattern>/servlet/GetInitParameterServlet</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

四 Servlet

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class GetInitParameterServlet extends HttpServlet {

private String username;//用户名

private String password; //密码

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

/**

* Constructor of the object.

public GetInitParameterServlet() {

super();

}

/**

* Destruction of the servlet. <br>

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

/**

* The doGet method of the servlet. <br>

* This method is called when a form has its tag value method equals to get.

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request,response);

}

/**

* The doPost method of the servlet. <br>

* This method is called when a form has its tag value method equals to post.

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

out.println("<HTML>");

out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");

out.println(" <BODY>");

out.println("<h2>"+"用户名："+this.getUsername()+"</h2>");

out.println("<h2>"+"密码："+this.getPassword()+"</h2>");

out.println(" </BODY>");

out.println("</HTML>");

out.flush();

out.close();

}

/**

* Initialization of the servlet. <br>

* @throws ServletException if an error occurs

public void init() throws ServletException {

// Put your code here

this.setUsername(this.getInitParameter("username"));

this.setPassword(this.getInitParameter("password"));

}

五测试

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