package cn.xxx.yyy;

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.HttpServletResponse;

public class HeaderFilter implements Filter {

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {

        // iframe引起的内部cookie丢失
        HttpServletResponse res = (HttpServletResponse) response;
        res.setHeader("P3P", "CP=CAO PSA OUR");
        if (chain != null) {
            chain.doFilter(request, response);
        }
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

}

    <!-- ======================写P3P Header，解决IE的iframe的cookie问题======================= -->
    <filter>
        <filter-name>P3pHeaderFilter</filter-name>
        <filter-class>cn.xxx.yyy.HeaderFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>P3pHeaderFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>