SEO需求要把不带www的域名一直跳带www,因为使用的是阿里云的slb服务,且没有像nginx rewriter功能,而且也无法像apache那样通过配置.htaccess来实现或者nginx反向代理来。如果想要把不带“www’的域名重定向到带”www”域名下,又不想写代码,可以使用UrlRewriteFilter来实现。
一、简介
urlRewriteFilter是一个用于改写URL的Web过滤器,类似于Apache的mod_rewrite。适用于任何Web应用服务器(如Tomcat,jboss,jetty,Resin,Orion等)。其典型应用就把动态URL静态化,便于搜索引擎爬虫抓取你的动态网页。
二、下载
下载UrlRewriteFilter
wget http://urlrewritefilter.googlecode.com/files/urlrewritefilter-4.0.3.jar 并放入tomcat的 WEB-INF/lib下
三、配置tomcat
编辑WEB-INF/web.xml 在其它servlet mapping前加入
官方:
<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>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
我的配置:
<!--301地址重定向-->
<filter>
<filter-name>UrlRewriteFilter</filter-name>
<filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
<init-param>
<param-name>confReloadCheckInterval</param-name>
<param-value>60</param-value>
</init-param>
<init-param>
<param-name>confPath</param-name>
<param-value>/WEB-INF/urlrewite.xml</param-value>
</init-param>
<init-param>
<param-name>logLevel</param-name>
<param-value>DEBUG</param-value>
</init-param>
<init-param>
<param-name>statusPath</param-name>
<param-value>/status</param-value>
</init-param>
<init-param>
<param-name>statusEnabled</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>UrlRewriteFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
</filter-mapping>
四、添加跳转规则
在WEB-INF下新建urlrewrite.xml文件,加入跳转规则
<urlrewrite>
<rule>
<name>seo redirect</name>
<!-- 排除 -->
<condition name="host" operator="notequal">^www.bighug.top</condition>
<condition name="host" operator="notequal">^localhost</condition>
<!--规则 -->
<from>^/(.*)</from>
<to type="permanent-redirect" last="true">http://www.bighug.top/$1</to>
</rule>
</urlrewrite>
五、测试
访问 http://bighug.top 跳转到http://www.bighub.top 就配置成功了
参考官方文档:
http://cdn.rawgit.com/paultuckey/urlrewritefilter/master/src/doc/manual/4.0/index.html