开发框架－－Struts里过滤器的简单使用

步骤只要两个:

一是你只要在你的WEB根目录下打开web.xml,然后在父节点加上Filter节点就行.

代码如下:
< filter>
    < filter-name>Set Character Encoding< /filter-name>
    < filter-class>com.yirong.framework.filters.SetCharacterEncodingFilter< /filter-class>
    < init-param>
      < param-name>encoding< /param-name>
      < param-value>GBK< /param-value>
    < /init-param>
    < init-param>
      < param-name>ignore< /param-name>
      < param-value>true< /param-value>
    < /init-param>
  < /filter>
  < filter-mapping>
    < filter-name>Set Character Encoding< /filter-name>
    < url-pattern>/*< /url-pattern>
  < /filter-mapping>

二是:把过滤器的代码(如下代码)放在你的工程目录的源代码管理目录中.
比如我这边的目录是:/myweb/src/Beans
(Beans是我自建的包名)

package Beans;

import org.apache.struts.action.RequestProcessor;
import javax.servlet.*;
import javax.servlet.http.*;

public class MyRequestProcessor extends RequestProcessor {
    public MyRequestProcessor() {
    }

    protected boolean processPreprocess(HttpServletRequest request,HttpServletResponse response){
        boolean cp=true;
        String remoteHost=request.getRemoteHost();
        if(remoteHost==null || !remoteHost.startsWith("126.")){
            cp=false;
            try{
                response.sendRedirect("iperror.jsp");
            }
            catch(Exception ex){
                ex.printStackTrace();
            }
        }
        System.out.println("--test--");
        return cp;
    }
}

这样一切都可搞定了.
每次有请求它都有将通过过滤器...
      (责任编辑：包春林)