自定义Filter对URL重写

使用Filter 对URL进行重写 Filter类： [cc lang="java" nowrap="false"]import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.NodeList; /** * 实现对请求URL重写 * @author chenlei * @date Sep 22, 2010 * @time 10:46:55 PM * @link email */ public class URLRewriteFilter implements Filter { private final static Log log = LogFactory.getLog(URLRewriteFilter.class); DocumentBuilderFactory builderFactory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = null; Document document = null; public void destroy() { } public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; HttpServletResponse response = (HttpServletResponse) servletResponse; getRewriteUrl(filterChain, request, response); } private void getRewriteUrl(FilterChain filterChain, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String url = request.getServletPath(); NodeList childNodes = (NodeList) document.getElementsByTagName("rule"); for (int i = 0; i < childNodes.getLength(); i++) { Element elemnt = (Element) childNodes.item(i); NodeList list2 = elemnt.getElementsByTagName("from"); Element element = (Element) list2.item(0); String formValue = element.getFirstChild().getNodeValue(); NodeList list3 = elemnt.getElementsByTagName("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)) { if (null != rewriteUrl && type.equals("forward")) { request.getRequestDispatcher(rewriteUrl).forward(request, response); return; } else if (null != rewriteUrl && type.equals("redirect")) { response.sendRedirect(rewriteUrl); return; } } } filterChain.doFilter(request, response); } public void init(FilterConfig config) throws ServletException { try { builder = builderFactory.newDocumentBuilder(); String realPath = config.getServletContext().getRealPath("/"); document = (Document) builder.parse(realPath + "WEB-INF\\urlrewrite.xml"); log.info("loading ["+URLRewriteFilter.class+"] config file: [->" + document.getDocumentURI() + "]"); } catch (Exception e) { e.printStackTrace(); } } }[/cc] 在WEB-INF目录下新建urlrewrite.xml文件，使用正则表达式匹配请求URL，代码如下

<?xml version="1.0" encoding="UTF-8"?>
<urlrewrite>
<rule>
     <from>^/view/(.*)1.html$</from> 
     <to type="forward">/test/$1.jsp</to>
</rule>
<rule>
     <from>^/test/(.*).html$</from> 
     <to type="redirect">/test/$1.jsp</to>
</rule>
</urlrewrite>

在web.xml中加入如下代码：


<filter>
  <filter-name>urlFilter</filter-name>
  <filter-class>
   com.wixs.core.util.urlfilter.URLRewriteFilter
  </filter-class>
 </filter>

 <filter-mapping>
  <filter-name>urlFilter</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>
 <filter>