目的：只是想验证一下filter对URI的过滤
流程讲解：浏览器请求URI，所有请求都走过虑器，在过滤器中处理符合某种请求的URI然后显示对应的页面内容
有2个JSP页面：
index.jsp:
<body>
This is index page. 111111111111111111111<br>
<ul>
<li>1111111111</li>
<li>2222222222</li>
</ul>
</body>
select.jsp:
<body>
<ul>
<li>3333333</li>
<li>444444444</li>
</ul>
</body>
filter类UrlFilter.java
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpServletRequest=(HttpServletRequest) request;
HttpServletResponse httpServletResponse=(HttpServletResponse) response;
String requestUrl = httpServletRequest.getRequestURI();
String ContextPath =httpServletRequest.getContextPath();
System.out.println(requestUrl+"========"+ContextPath);
String ContextPath1=ContextPath+"/";
String uri=requestUrl.replace(ContextPath1, "");
System.out.println("uri==========="+uri); //String info = uri.substring(0, uri.indexOf("."));
if("index".equals(uri)){
httpServletRequest.getRequestDispatcher("index.jsp").forward(httpServletRequest, httpServletResponse);
}else if("select".equals(uri)){
httpServletRequest.getRequestDispatcher("select.jsp").forward(httpServletRequest, httpServletResponse);
}
}
web.xml配置：
<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name></display-name> <filter>
<filter-name>urlFilter</filter-name>
<filter-class>filter.UrlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>urlFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
浏览器访问uri:
1、http://localhost:8080/struts/index显示index.jsp页面内容
2、http://localhost:8080/struts/select显示select.jsp页面内容