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利用泛解析和Filter实现动态二级域名

标签: 利用 解析 filter | 发表时间:2015-12-26 12:13 | 作者:namezhou

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出处:http://www.iteye.com

itEye等网站有个很不错的机制,就是每个用户都有一个永久的二级域名 正好所在的项目也想实现这样的功能,研究了一下,发现用过滤器实现最简单,

http://7784.namezhou.com 实际打开的是 http://www.namezhou.com/7784

步骤如下:

1.去DNS供应商开启泛解析,就是加一条cname记录*.namezhou.com 指向www.namezhou.com

2.编写一个Filter,当检测到是二级域名xxx.namezhou.com时,把地址跳转成http://www.namezhou.com/xxx

代码如下:

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;  /**  * 泛域名解析过滤器  * @author namezhou  * @since Dec 26, 2015  */ public class DomainFilter implements Filter{  private String mainDomain;//主域名裸域地址  private String expectDomain;//排除域名,分号隔开  public String getMainDomain() {   return mainDomain;  }  public void setMainDomain(String mainDomain) {   this.mainDomain = mainDomain;  }  public String getExpectDomain() {   return expectDomain;  }  public void setExpectDomain(String expectDomain) {   this.expectDomain = expectDomain;  }  @Override  public void destroy() {     }  @Override  public void doFilter(ServletRequest request, ServletResponse response,    FilterChain chain) throws IOException, ServletException {   String url = ((HttpServletRequest)request).getRequestURI();   String host = request.getServerName();   boolean redirect = false;   if(host.equals(mainDomain)){    //访问的裸域    chain.doFilter(request, response);   }else if(expectDomain!=null&&expectDomain.trim().length()>0){    String[] arr = expectDomain.split(";");    if(arr!=null&&arr.length>0){     for (int i = 0; i < arr.length; i++) {      if(host.equals(arr[i]+"."+mainDomain)){       //排除的域,直接显示       redirect = true;       chain.doFilter(request, response);      }     }    }   }   if(!redirect){    //检查是不是有    String id = host.replace("."+mainDomain, "");    ((HttpServletResponse)response).sendRedirect("http://www.namezhou.com/"+id);   }  }  @Override  public void init(FilterConfig arg0) throws ServletException {   expectDomain = arg0.getInitParameter("expectDomain");   mainDomain = arg0.getInitParameter("mainDomain");  } }

3.配置该Filter

<!-- 泛域名解析过滤器 start -->  <filter>   <filter-name>domainFilter</filter-name>   <filter-class>com.namezhou.common.filter.DomainFilter</filter-class>   <init-param>    <param-name>mainDomain</param-name>    <param-value>namezhou.com</param-value>   </init-param>   <init-param>    <param-name>expectDomain</param-name>    <param-value>www;dev</param-value>   </init-param>  </filter>  <filter-mapping>   <filter-name>domainFilter</filter-name>   <url-pattern>/*</url-pattern>  </filter-mapping>  <!-- 泛域名解析过滤器 end -->

博客里面还有另外一种基于Apache rewrite模块的实现方法,与那种方法比较起来,过滤器实现方式

优点:简单,逻辑清晰,实现方便,

缺点:访问地址会变,当然也可以弄一个空iframe页面,去嵌入需要显示的页面,但略显山寨

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