JavaWeb核心编程之(三)Servlet配置

时间：2016-07-16 23:08:28 阅读：289 评论：0 收藏：0 [点我收藏+]

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Servlet配置

1.配置Serlvet加载时机

2.配置多映射

配置加载时机

新建项目config->创建包com.xiaoan.config->创建类FirstServlet implements Servlet(实现Servlet接口)

->创建类SoundServlet(也实现Servlet接口)

配置web.xml

先配置两个Servlet实现类的Servlet

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <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">
 3   <display-name>config</display-name>
 4   
 5   <servlet>
 6       <servlet-name>fs</servlet-name>
 7       <servlet-class>com.xiaoan.config.FirstServlet</servlet-class>
 8       <load-on-startup>3</load-on-startup>
 9   </servlet>
10   
11   <servlet-mapping>
12       <servlet-name>fs</servlet-name>
13       <url-pattern>/fs</url-pattern>
14   </servlet-mapping>
15   
16   
17   <servlet>
18       <servlet-name>ss</servlet-name>
19       <servlet-class>com.xiaoan.config.SoundServlet</servlet-class>
20       <load-on-startup>1</load-on-startup>
21   </servlet>
22   <servlet-mapping>
23       <servlet-name>ss</servlet-name>
24       <url-pattern>/ss</url-pattern>
25   </servlet-mapping>
26   
27 </web-app>

运行项目控制台输出为

Sound constiuctor
Sound init
First constiuctor
first init

说明<load-on-startup> 配置值越小越会先加载

Servlet多映射

将上面的web.xml的fs servlet的配置中再添加一个servlet-mapping

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <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">
 3   <display-name>config</display-name>
 4   
 5   <servlet>
 6       <servlet-name>fs</servlet-name>
 7       <servlet-class>com.xiaoan.config.FirstServlet</servlet-class>
 8       <load-on-startup>3</load-on-startup>
 9   </servlet>
10   
11   <servlet-mapping>
12       <servlet-name>fs</servlet-name>
13       <url-pattern>/fs</url-pattern>
14   </servlet-mapping>
15   <servlet-mapping>
16       <servlet-name>fs</servlet-name>
17       <url-pattern>/fs1/*</url-pattern>
18   </servlet-mapping>
19   <servlet-mapping>
20       <servlet-name>fs</servlet-name>
21       <url-pattern>*.html</url-pattern>
22   </servlet-mapping>
23   
24   
25   <servlet>
26       <servlet-name>ss</servlet-name>
27       <servlet-class>com.xiaoan.config.SoundServlet</servlet-class>
28       <load-on-startup>1</load-on-startup>
29   </servlet>
30   <servlet-mapping>
31       <servlet-name>ss</servlet-name>
32       <url-pattern>/ss</url-pattern>
33   </servlet-mapping>
34   
35 </web-app>