最基本的 Java Web 项目模板，无需 J2EE 环境

package demo; 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; public class HelloFilter implements Filter { @Override public void init(FilterConfig arg0) throws ServletException { System.out.println("Filter 初始化"); } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest)req; System.out.println("拦截 URI="+request.getRequestURI()); chain.doFilter(req, res); } @Override public void destroy() { System.out.println("Filter 结束"); } }