JavaWeb核心编程之(三.2)Servlet配置

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>

重启服务器

届时 浏览器中访问

localhost:8080/config  

http://localhost:8080/config/fs

http://localhost:8080/config/fs1

http://localhost:8080/config/fs1/任意字符

http://localhost:8080/config/任意字符.html

会运行firstservlet的 service方法

 

源代码到  http://git.oschina.net/azhw/java_node

 

posted @ 2016-07-16 17:32  安仲炜  阅读(441)  评论(0)  编辑  收藏  举报