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public class DemoFilter implements Filter {
@Override
public void destroy() {}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest)request;
System.out.println(req.getSession());
response.getWriter().println("hello world!");
}
@Override
public void init(FilterConfig arg0) throws ServletException {}
}
<filter>
<filter-name>demoFilter</filter-name>
<filter-class>demo.DemoFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>demoFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>