如何配置多个 Jetty 处理程序？

Question

我在为 Web 应用程序设置处理程序时遇到问题，我想要的是：通过 withHTTPServlet和doGet方法处理一些请求doPost（如何从这些方法中加载 JSP 页面？）并且还能够加载静态内容（html、JS、CSS）。

我现在的设置方式，只能选择其中之一，无法同时使用。

我会解释：

Server server = new Server(5000);

// This is the resource handler for JS & CSS

ResourceHandler resourceHandler = new ResourceHandler();

resourceHandler.setResourceBase(".");

resourceHandler.setDirectoriesListed(false);

// This is the context handler for the HTTPServlet

ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);

context.setContextPath("/");

context.addServlet(new ServletHolder(new Main()),"/*");

// this is the Handler list for both handlers

HandlerList handlerList = new HandlerList();

handlerList.setHandlers(new Handler[] { context ,resourceHandler});

/*

   If I add them in this order,
   all requests will be handled by the "context" and no static resource is loaded

   If I invert the order, the index page page is loaded by the resource handler, which means,
   If I activate directory listings, it gives me a list of all directories, otherwise it's just a blank page

   I tried working with a WebAppContext to load JSP pages
   but I still had some problems with which handler should handle which requests
*/

server.setHandler(handlerList);

server.start();

server.join();

---

我遇到的问题是我的 HTTP servlet 的行为方式如下：处理所有请求，不为资源处理程序留下任何内容，因此当脚本请求脚本时.js，它会返回一个空的 HTML 页面。这是一个例子：

WebAppContext root = new WebAppContext();

root.setParentLoaderPriority(true);
root.setContextPath("/");
root.setResourceBase(".");
root.setWelcomeFiles(new String[] {"test.jsp"});
root.addServlet(new ServletHolder(new Main()),"/*");

HandlerList handlerList = new HandlerList();
handlerList.setHandlers(new Handler[] { root });

在这个例子中，当使用没有servlet的根处理程序时Main，它加载所有静态内容和jsp页面，但是当添加主servlet时，它不再加载任何静态内容，并用一个空的HTML页面响应所有静态内容请求。

Answer 1

当您使用 servlet 时，servlet 链的末尾总是有一个终止点。

它将是：

• （DefaultServlet当使用完整的WebAppContext）
• （Default404Servlet当使用更简单的设置时，例如ServletContextHandler）

如果您想要的只是ResourceHandler提供静态内容，请将其用于DefaultServlet您自己的目的（它是更好的选择，并且还支持更多功能。例如范围请求、缓存、自动 gzip、内存映射文件服务等）

例子：

package jetty;

import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.servlet.DefaultServlet;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.servlet.ServletHolder;

public class ManyDefaultServlet
{
    public static void main(String[] args)
    {
        System.setProperty("org.eclipse.jetty.servlet.LEVEL","DEBUG");

        Server server = new Server();
        ServerConnector connector = new ServerConnector(server);
        connector.setPort(8080);
        server.addConnector(connector);

        // Setup the basic application "context" for this application at "/"
        // This is also known as the handler tree (in jetty speak)
        ServletContextHandler context = new ServletContextHandler(ServletContextHandler.SESSIONS);
        context.setContextPath("/");
        server.setHandler(context);

        // The filesystem paths we will map
        String homePath = System.getProperty("user.home");
        String pwdPath = System.getProperty("user.dir");

        // Fist, add special pathspec of "/home/" content mapped to the homePath
        ServletHolder holderHome = new ServletHolder("static-home", DefaultServlet.class);
        holderHome.setInitParameter("resourceBase",homePath);
        holderHome.setInitParameter("dirAllowed","true");
        holderHome.setInitParameter("pathInfoOnly","true");
        context.addServlet(holderHome,"/home/*");

        // Lastly, the default servlet for root content
        // It is important that this is last.
        ServletHolder holderPwd = new ServletHolder("default", DefaultServlet.class);
        holderPwd.setInitParameter("resourceBase",pwdPath);
        holderPwd.setInitParameter("dirAllowed","true");
        context.addServlet(holderPwd,"/");

        try
        {
            server.start();
            server.dump(System.err);
            server.join();
        }
        catch (Throwable t)
        {
            t.printStackTrace(System.err);
        }
    }
}