Servlet一(web基础学习笔记二十)

package com.pb.servletdemo;

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 Myservlet3 extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("doGet方法被调用");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        System.out.println("doPost方法被调用");
    }

    /*@Override
    protected void service(HttpServletRequest arg0, HttpServletResponse arg1)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
        super.service(arg0, arg1);
    }*/

    @Override
    public void destroy() {
        System.out.println("Servlet销毁,destroy方法被调用");
    }

    @Override
    public void init(ServletConfig config) throws ServletException {
        System.out.println("Servlet初始化,init方法被调用");
        String initParam=config.getInitParameter("charSetContent");
        System.out.println(initParam);
        
    }

}

<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>servletdemo</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 首先是servlet标签 -->
  <servlet>
  <!-- 指定servlet的名字 可以与建立的servlet名字不一样，别名-->
  <servlet-name>myserlvet</servlet-name>
  <!-- servlet的类名   包名.类名的完整路径-->
  <servlet-class>com.pb.servletdemo.Myservlet3</servlet-class>
  <!-- 初始参数 -->
  <init-param>
  <!-- 设置字符集 -->
  <param-name>charSetContent</param-name>
  <!--值  -->
  <param-value>utf-8</param-value>
  </init-param>
  </servlet>
  <!-- 截获请求 servlet映射-->
  <servlet-mapping>
  <!-- 些servlet-name要与上方的servlet-name名字一样不然会报错 -->
  <servlet-name>myserlvet</servlet-name>
  <!-- 一个servlet可以 有多个url-pattern-->
  <!-- 精确匹配 -->
  <url-pattern>/myservlet3</url-pattern>
  <!-- 加上虚拟目录 -->
  <url-pattern>/demo/myservlet3</url-pattern>
  <!-- 通配符来配置* -->
  <url-pattern>/*</url-pattern>
  <!-- 后缀名来配置 -->
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
</web-app>

<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>javaee.sg.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/helloServ</url-pattern>
</servlet-mapping>

<servlet-name>HelloServlet</servlet-name>
<url-pattern>/helloServ/*</url-pattern>

<servlet-name>HelloServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

<servlet-mapping>
<servlet-name> HelloServlet </servlet-name>
<url-pattern>/helloServ</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name> HelloServlet </servlet-name>
<url-pattern>/helloServ/* </url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name> HelloServlet </servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>