Jetty添加Filter过滤器

1.Jetty嵌入到Spring项目

 try {
            Server server = new Server(8080);  

            WebAppContext context = new WebAppContext();
            context.setContextPath("/test");
            context.setDescriptor(filePath + "/conf/web.xml"); // 指定web.xml配置文件
            context.setResourceBase(filePath + "/conf/");// 指定webapp目录
            context.setParentLoaderPriority(true);  

            server.setHandler(context);
            server.start();
            server.join();  

        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

2.Jetty添加Filter的方式有两种

1.类似Tomcat，在web.xml中指定过滤器，但需要确定配置文件WEB-INF/web.xml 存在于webapp根目录

<?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>
    <filter>
        <filter-name>filterName</filter-name>
        <filter-class>com.x.y.z.FilterClass</filter-class>
    </filter>
    <filter-mapping>
        <url-pattern>/test</url-pattern>
        <filter-name>filterName</filter-name>
    </filter-mapping>
</web-app>

2.直接用addFilter API

主要用到 ServletContextHandler、FilterMapping、FilterHolder几个类

import java.io.IOException;
import java.util.EnumSet;
import java.util.Enumeration;

import javax.servlet.DispatcherType;
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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.servlet.FilterHolder;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHandler;
import org.eclipse.jetty.servlet.ServletHolder;

public class TestEmbeddedFilter {

    public static void main(String[] args) {
        Server server = new Server(8082);

        ServletContextHandler context = new ServletContextHandler(
                ServletContextHandler.SESSIONS);
        context.setContextPath("/");

        ServletHandler handler = new ServletHandler();
        ServletHolder sh = new ServletHolder(new MyServlet());
        context.addServlet(sh, "/*");

        FilterHolder fh = handler.addFilterWithMapping(MyFilter.class, "/*", EnumSet.of(DispatcherType.REQUEST));
        fh.setInitParameter("initParamKey", "InitParamValue");

        context.addFilter(fh, "/*", EnumSet.of(DispatcherType.REQUEST));

        context.setHandler(handler);
        server.setHandler(context);
        try {
            server.start();
            // server.join();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    @SuppressWarnings("serial")
    public static class MyServlet extends HttpServlet {

        @Override
        protected void doGet(HttpServletRequest request,
                HttpServletResponse response) throws ServletException,
                IOException {
            response.setContentType("text/html");
            response.setStatus(HttpServletResponse.SC_OK);
            response.getWriter().println("<h1>Hello MyServlet</h1>");

        }
    }

    public static class MyFilter implements Filter {

        public void destroy() {
            System.out.println("Stopping filter");
        }

        public void doFilter(ServletRequest request, ServletResponse response,
                FilterChain chain) throws IOException, ServletException {
            System.out.println("doFilter called with: " + request);

            chain.doFilter(request, response);
        }

        public void init(FilterConfig filterConfig) throws ServletException {
            Enumeration<String> enums = filterConfig.getInitParameterNames();

            while (enums.hasMoreElements()) {
                String param = (String) enums.nextElement();
                System.out.println(param + ":" + filterConfig.getInitParameter(param));
            }
        }

    }

}

可参考：

addFilter使用方法

http://blog.csdn.net/sidyhe/article/details/52084558

http://stackoverflow.com/questions/14390577/how-to-add-servlet-filter-with-embedded-jetty

官方实例

http://alvinalexander.com/java/jwarehouse/jetty-6.1.9/modules/util/src/main/java/org/mortbay/servlet/GzipFilter.java.shtml

如果让某些请求绕过Filter

http://blog.csdn.net/moonsheep_liu/article/details/6862921