为什么我的servlet 文件夹过滤器web.xml中的配置参数传不进去呢
ListFilter.java代码如下
package common;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.*;
public class ListFilter implements Filter
{
private FilterConfig filterConfig = null;
private String type="";
private String Log_Page="/error.jsp";
public void init(FilterConfig filterConfig) throws ServletException
{
this.filterConfig = filterConfig;
//获取初始化参数
this.type = filterConfig.getInitParameter("type");
}
public void doFilter(ServletRequest request,
ServletResponse response,
FilterChain chain)
throws IOException, ServletException
{
HttpServletRequest req=(HttpServletRequest)request;
HttpServletResponse res=(HttpServletResponse)response;
HttpSession session=req.getSession();
String membertype="";
if(session.getAttribute("membertype")!=null)
membertype=(String)session.getAttribute("membertype");
if(membertype.equals(type))
{
//通过,继续处理。
chain.doFilter(request,response);
}
else
{
res.sendRedirect(Log_Page);
}
}
public void destroy()
{
this.type = null;
this.Log_Page = null;
this.filterConfig = null;
}
}
web.xml代码如下
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4">
<display-name>Welcome to Tomcat</display-name>
<description>
Welcome to Tomcat
</description>
<!-- JSPC servlet mappings start -->
<!-- JSPC servlet mappings end -->
<filter>
<filter-name>ListFilter</filter-name>
<filter-class>common.ListFilter</filter-class>
<init-param>
<param-name>type</param-name>
<param-value>业务员</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>ListFilter</filter-name>
<url-pattern>/list/*</url-pattern>
</filter-mapping>
<!-- SESSION TIME OUT -->
<session-config>
<session-timeout>-1</session-timeout>
</session-config>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/rot</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
运行的时候,不论是否符合条件,一律指向了error.jsp,这说明,if(membertype.equals(type))始终是非。如果我把servlet中的 if(membertype.equals(type))换成 if(membertype.equals("业务员"))就能正常过滤了,这说明是type没有把参数值传到servlet进去,哪儿的原因呢,请高手指点如果我把servlet中的 if(membertype.equals(type))换成 if(membertype.equals("业务员"))就能正常过滤了,这说明是type没有把参数值传到servlet进去,哪儿的原因呢,请高手指点