Java web.xml笔记

Javaweb项目中, web.xml文件其中的各种设置, 就是简单的标注
<?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" version="3.0">
  <display-name>hujing</display-name>
  <!-- 欢迎页面，从上到下依次寻找 -->
  <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>
  <!-- 将值放入ServletContext中 -->
    <context-param>  
    　　<param-name>name</param-name>  
    　　<param-value>value></param-value>  
    </context-param> 
  <!-- 注册servlet -->
  <servlet>
        <servlet-name>aaa</servlet-name>
        <servlet-class>servlet.AServlet</servlet-class>
        <!-- 为这个Servlet的ServletConfig设置初始参数 -->
        <init-param>
            <param-name>name</param-name>
            <param-value>123</param-value>
        </init-param>
  </servlet>
  <servlet-mapping>
          <servlet-name>aaa</servlet-name>
        <!-- url可以有多种写法，也可以有多个 -->
          <url-pattern>/son</url-pattern>
        <url-pattern>/son/nn</url-pattern>
        <url-pattern>/son/*</url-pattern>
        <!-- 拦截所有请求 -->
        <url-pattern>/*</url-pattern>
        <!-- 只会拦截静态资源请求，不会拦截动态资源请求 -->
        <url-pattern>/</url-pattern>
        <!-- 后缀名拦截 -->
        <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <!-- 注册Filter -->
   <filter>
        <filter-name>Set Character Encoding</filter-name>
        <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
        <!-- 设置参数会存到FilterConfig中 -->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
  <filter-mapping>
          <filter-name>aaa</filter-name>
        <!-- url可以有多种写法，也可以有多个,可参考Servlet,在Filter中'/'不起作用 -->
          <url-pattern>/son</url-pattern>
        <!-- 表示当前filter拦截指定servlet请求,写了servlet-name就不写url-pattern -->
        <servlet-name>aaa</servlet-name>
        <!-- 截断的请求类型，可以指定多个 
            REQUEST: 截断request请求(默认) 
            FORWORD: 截断forword请求
            INCLUDE: 截断include请求
            ERROR: 截断<error-page>请求
        -->
        <dispatcher></dispatcher>
  </filter-mapping> 
  <!-- 注册出现错误时的跳转页面 -->
  <error-page>
        <!-- 通过错误码配置 -->
        <error-code>404</error-code>
        <!-- 通过异常类配置 -->
        <exception-type>Java.lang.NullException</exception-type>
        <!-- 跳转的页面 -->
        <location>/servlet</location>
  </error-page>
    <!-- 注册Servlet监听器 -->
  <listener>
        <listener-class>类全名</listener-class>
  </listener>
</web-app>
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