三思考，实现自己定义404页：Tomcat、SpringMVC精确匹配、重写DispatchServlet

<error-page>  
    <error-code>404</error-code>  
    <location>/error/404.htm</location>  
</error-page>  

@Controller
public class UrlNotFoundController {
	@RequestMapping("*")
	public String test404(){
		//TODO
		return "404Page";
	}
}

@Controller("/home")
public class HomeController{
@RequestMapping("a")
	public String a(){
      //
	}
}

<servlet>
		<servlet-name>theDispatcher</servlet-name>
		<servlet-class>base.web.MyDispatchServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/spring-mvc-servlet.xml</param-value>
		</init-param>
		<init-param>
			<param-name>fileNotFondUrl</param-name>
			<param-value>/error/404</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>theDispatcher</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

public class MyDispatchServlet extends DispatcherServlet {

	private static final long serialVersionUID = 1L;

	private static final UrlPathHelper urlPathHelper = new UrlPathHelper();
	
	private String fileNotFondUrl = "/error/404.html";
	
	public void noHandlerFound(HttpServletRequest request, HttpServletResponse response) throws Exception {
		if (pageNotFoundLogger.isWarnEnabled()) {
			String requestUri = urlPathHelper.getRequestUri(request);
			pageNotFoundLogger.warn("No mapping found for HTTP request with URI [" + requestUri +
					"] in DispatcherServlet with name ‘" + getServletName() + "‘");
		}
	
		response.sendRedirect(request.getContextPath() + fileNotFondUrl);
	}

	public String getFileNotFondUrl() {
		return fileNotFondUrl;
	}

	public void setFileNotFondUrl(String fileNotFondUrl) {
		this.fileNotFondUrl = fileNotFondUrl;
	}
	
	
}	

  <servlet-mapping>
		<servlet-name>default</servlet-name>
		<url-pattern>/static/*</url-pattern>
	</servlet-mapping>