映射規則4

映射url：請求URL減去當前應用上下文和之前的部分及參數部分作爲映射URL
是可以出現多次的，但是不能相同
映射規則：
路徑匹配：
1. 精確路徑匹配/servlet
2. 最長路徑匹配/servlet/* /servlet1/servlet2/*
擴展匹配 *.do
默認匹配 訪問一個沒有的，就可以使用默認的Servlet urlpattern爲一個/的Servlet

當一個urlpatter爲”“空字符串的時候，適用於歡迎頁面指向一個Servlet

路徑匹配與擴展名匹配不能同時使用

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>project3</display-name>
  <servlet>
    <servlet-name>servlet1</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet1</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>servlet2</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet2</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>servlet3</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet3</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>servlet4</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet4</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>servlet5</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet5</servlet-class>
  </servlet>
  <servlet>
    <servlet-name>servlet6</servlet-name>
    <servlet-class>com.tanlan.javaees1.Servlet6</servlet-class>
  </servlet>




  <servlet-mapping>
    <servlet-name>servlet1</servlet-name>
    <url-pattern>/servlet1</url-pattern>
  </servlet-mapping>
  <!-- <servlet-mapping>
    <servlet-name>servlet2</servlet-name>
    <url-pattern>/servlet1/*</url-pattern>
  </servlet-mapping> -->
  <servlet-mapping>
    <servlet-name>servlet3</servlet-name>
    <url-pattern>/servlet1/servlet2/*</url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>servlet4</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
    <servlet-mapping>
    <servlet-name>servlet5</servlet-name>
    <url-pattern></url-pattern>
  </servlet-mapping>
  <servlet-mapping>
    <servlet-name>servlet6</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <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>
</web-app>