有关ServletConfig的用法

最新推荐文章于 2025-06-13 19:50:41 发布

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本文介绍如何使用ServletConfig对象获取初始化参数，并通过注解和配置文件(web.xml)两种方式设置这些参数。示例代码展示了如何在Servlet中读取并打印这些初始化参数。

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06820170907
1、在注解或者配置文件(web.xml)中写明初始化信息

2、通过getServletConfig().getInitParameter(name);返回参数值

3、代码如下：

package com.tiger.config.annotation;

import java.io.*;
import javax.servlet.*;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
/**
 * 06820170907
 * 1、配置文件方式初始化信息
 * ServletConfig是每个Servelt都会产生一个ServletConfig对象与之对应
 * @author tiger
 * @time 2017年9月7日
 */
@WebServlet(name = "ServletConfig_annotation",
		urlPatterns = { "/servletConfig_annotation" },
		initParams = {@WebInitParam(name = "username",value = "tiger"),
				@WebInitParam(name = "password",value = "123456")})
public class ServletConfig_annotation extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String username = getServletConfig().getInitParameter("username");
		String password = getServletConfig().getInitParameter("password");
		response.getWriter().append("username = ").
		append(username).append("   password = ").
		append(password);
		System.out.println("-------ServletConfig_annotation----------");
		System.out.println("username = " + username);
		System.out.println("password = " + password);
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}
package com.tiger.config.web_xml;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
 * 2、配置文件方式初始化信息
 * @author tiger
 * @time 2017年9月7日
 */
public class ServletConfig_xml extends HttpServlet {
	
	private static final long serialVersionUID = 1L;
	
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String username = getServletConfig().getInitParameter("username");
		String password = getServletConfig().getInitParameter("password");
		response.getWriter().append("username = ").
		append(username).append("   password = ").
		append(password);
		System.out.println("------ServletConfig_xml---------");
		System.out.println("username = " + username);
		System.out.println("password = " + password);
	}
	
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}


	20170906-servletConfig-配置文件方式实现
	
		index.html
		index.htm
		index.jsp
		default.html
		default.htm
		default.jsp
	
	
		ServletConfig
		com.tiger.config.web_xml.ServletConfig_xml
		
			username
			tiger
		
		
			password
			123456
		
	
	
		ServletConfig
		/servletConfig