这几天蛋疼.看看别人url重写是怎么搞的..
1.解释下什么事url重写，以及它的优缺点：URL重写，其实就是把带一大堆参数的url，变成一个看上去很规矩的url。例：/viewthread.jsp?id=1234 重写后，可以用/viewthread/1234.html一、自定义过滤器示例：1.配置过滤器一般在web.xml中<filter> <filter-name>urlFilter</filter-name> <filter-class>com.url.filter.URLFilter</filter-class></filter><filter-mapping> <filter-name>urlFilter</filter-name> <url-pattern>*.shtml</url-pattern></filter-mapping>2.新建解析规则配置文件 urlrewrite.xml<?xml version="1.0" encoding="utf-8"?><urlrewrite> <rule> <from>^/(\w+)_(\w+)_(\d+)\.shtml$</from> 匹配表达式-正则表达式 <to type="forward">/$1.do?$2=$3</to> 解析后URL </rule></urlrewrite>3.过滤器处理类 URLFilter.java public class URLFilter implements Filter { public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException,ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; String realPath =request.getSession().getServletContext().getRealPath("/"); String fileName = realPath + "WEB-INF\\urlrewrite.xml"; String uri = request.getServletPath(); String rewriteUrl = getRewriteUrl(uri, fileName); if (null != rewriteUrl) { request.getRequestDispatcher(rewriteUrl).forward(request, response); return; } filterChain.doFilter(servletRequest, servletResponse); }private String getRewriteUrl(String url, String fileName) { DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); try { DocumentBuilder builder = f.newDocumentBuilder(); Document document = builder.parse(fileName); NodeList list = document.getElementsByTagName_r("rule"); for (int i = 0; i < list.getLength(); i++) { Element elemnt = (Element) list.item(i); NodeList list2 = elemnt.getElementsByTagName_r("from"); Element element = (Element) list2.item(0); String formValue = element.getFirstChild().getNodeValue(); NodeList list3 = elemnt.getElementsByTagName_r("to"); Element element2 = (Element) list3.item(0); String type = element2.getAttribute("type"); String toValue = element2.getFirstChild().getNodeValue(); String rewriteUrl = url.replaceAll(formValue, toValue); if (url != null && !"".equals(url.trim()) && !url.equals(rewriteUrl)) { return rewriteUrl; } } } catch (Exception ex) { ex.printStackTrace(); } return null; }}二、 Tomcat的过滤器组件1：下载urlrewrite-2.6.0.现在最新版本是3.1 的。 把 urlrewrite-2.6.0.jar拷到classpath下。2：在WEB-INF目录下建一个urlrewrite.xml文件。<?xml version="1.0" encoding="utf-8"?><!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 2.6//EN" ""><urlrewrite><rule> <from>^/(\w+)_(\w+)_(\d+)\.shtml$</from> <to type="forward">/$1.do?$2=$3&pageSize=15</to></rule></urlrewrite>解释： <from></from>写上你自己定义的访问地址 <to type="forward></to>就是实际的访问地址。比如我们实际的访问地址是： /URLRewriterDemo/ uRLTestAction.do?pageNumber=123而我们想把它重写：/URLRewriterDemo/uRLTestAction_pageNumber_123.shtml这样看起来比我们实际的要好看的多。我们就应该这样的写<rule> <from>^/(\w+)_(\w+)_(\d+)\.shtml$</from> <to type="forward">/$1.do?$2=$3&pageSize=15</to></rule>注意：常用的&要用 & 来表示。$1,$2代表与你配置正规表达式>/(\w+)/(\w+)/相对应的参数。<to type="forward">默认的是 type="forward".3：在web.xml中初始化。加上下面的代码： <filter> <filter-name>UrlRewriteFilter</filter-name> <filter-class> org.tuckey.web.filters.urlrewrite.UrlRewriteFilter </filter-class> </filter> <filter-mapping> <filter-name>UrlRewriteFilter</filter-name> <url-pattern>*.shtml</url-pattern> </filter-mapping>三、使用系统的404错误进行当请求时肯定是找不见相关页面了，那就跳到Error.jsp 进行相应的处理1.加入错误跳转配置 web.xml<error-page> <error-code>404</error-code> <location>/error.jsp</location></error-page>2.写错误页面 Error.jsp<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%><% response.setStatus(HttpServletResponse.SC_OK); String key = (String) request.getAttribute("javax.servlet.forward.servlet_path"); String reg = "^/(\\w+)_(\\w+)_(\\d+).shtml$"; String rewriteUrl = key.replaceAll(reg,"/$1.do?$2=$3&pageSize=15"); if(key != null || !key.equals(rewriteUrl)){ request.getRequestDispatcher(rewriteUrl).forward(request,response); } else{ out.print("对不起，您请求的页面没有找到! "); }%>