如何使URL过滤路由操作使用Servlet？(How to make a URL filter to

我目前正在开发一个Java EE Web框架，我想知道我怎么会路线我的网址的......我要支持HMVC功能！网址将遵循以下规则：

/ MODULE_NAME / CONTROLLER_NAME / ACTION_NAME，其中：

MODULE_NAME：路径由模块“X”斜线...例：子模块“Y”分隔：/ X / Y CONTROLLER_NAME：没有特殊字符控制器的名称ACTION_NAME：没有特殊字符的动作名称

我想图/ MODULE_NAME / CONTROLLER_NAME /到特定的servlet控制器！行动部分是对类的公共方法！ :)

我怎么能这样做？使用过滤器？我想一个例子，如果可能的话！

我看到3种方式：滤波器，基本的servlet（经由主servlet的所有请求）或“小服务程序映射”

过滤

这个例子重写URL

  http://example.org/<int值>

至

  http://example.org/user?id=<int值>

即

http://example.org/1234 -> http://example.org/user?id=1234

在web.xml中确定的过滤器

 <filter> <filter-name>Router</filter-name> <filter-class>org.example.Router</filter-class> <init-param> <param-name>param1</param-name> <param-value>valueOfparam1</param-value> </init-param> </filter> <filter-mapping> <filter-name>Router</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

到了init-PARAM部分，可以指定路由规则

过滤器类

 public class Router implements javax.servlet.Filter { private static final Pattern REWRITE_PATTERN = Pattern.compile("(^[1-9]\\d*)$"); @Override public void destroy() { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException { //this method calling before controller(servlet), every request HttpServletRequest request = (HttpServletRequest) req; String url = request.getRequestURL().toString(); String number = url.substring(url.lastIndexOf("/")).replace("/", ""); Matcher m = REWRITE_PATTERN.matcher(number); if(m.find()) { RequestDispatcher dispatcher = request.getRequestDispatcher("user?id=" + m.group(1)); dispatcher.forward(req, res); } else { fc.doFilter(req, res); } } @Override public void init(FilterConfig fc) throws ServletException { //here you may read params from web.xml }}

基本sevlet

public class BasicServlet extends HttpServlet {
   //route rules here, and rewrite
}

Servlet映射

<servlet-mapping>
    <servlet-name>UserServlet</servlet-name>
    <uri-mapping>/user/*</uri-mapping>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>PostServlet</servlet-name>
    <uri-mapping>/post/*</uri-mapping>
</servlet-mapping>