servletconfig.java代码：
package com.itcast.servletConfig;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletConfigDemo1 extends HttpServlet {
/*private ServletConfig config;
public void init(ServletConfig config) throws ServletException {
this.config = config;
}*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//第一种方式获取配置信息
/*String encoding = config.getInitParameter("encoding");//获得配置文件中的信息的
System.out.println(encoding);*/
//第二种方式或者配置信息
// String encoding = this.getServletConfig().getInitParameter("encoding");
// System.out.println(encoding);
//第三种方式获取配置信息
String encoding = super.getInitParameter("encoding");
System.out.println(encoding);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
配置文件代码：web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<servlet>
<servlet-name>servletconfig</servlet-name>
<servlet-class>com.haidi8.servletconfig.servletconfig</servlet-class>
<init-param>
<param-name>encoding</param-name>
<param-value>GBk</param-value>
</init-param>
</servlet>
<!-- 创建一个客户端可以访问的映射 -->
<servlet-mapping>
<servlet-name>servletconfig</servlet-name>
<url-pattern>/servletconfigdemo1</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
运行结果：
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