ServletConfig接口
Servlet容器初始化Servlet对象时会为Servlet创建一个ServletConfig对象,在ServletConfig对象中包含了Servlet的初始化参数信息,此外ServletConfig对象还与当前web应用中的ServletContext对象关联,Servlet容器在调用Servlet对象的init(SevletConfig config)方法时会把ServletConfig对象作为一个参数传递给Servlet对象,这个方法是的Servlet和ServletConfig对象之间建立关联,
每个初始化参数包含一对参数名和参数值,在web.xml中初始化参数时可以用<init-param>来设置参数值,<param-name>表示参数名,<param-value>表示参数值。
以下代码为一个FontServlet类设置了两个初始化参数size和color.
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>Font</servlet-name> <servlet-class>com.demo.servlet.FontServlet</servlet-class> <init-param> <param-name>color</param-name> <param-value>red</param-value> </init-param> <init-param> <param-name>size</param-name> <param-value>35</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>Font</servlet-name> <url-pattern>/font</url-pattern> </servlet-mapping> </web-app> |
FontServle.java
package com.demo.servlet; import javax.servlet.ServletException; /** } |
tomcat服务器控制台结果
浏览器结果
原文地址:https://www.cnblogs.com/sinceForever/p/8454410.html