如何配置Jetty处理程序?
我在为我的Web应用程序设置处理程序时遇到了一个问题,我想要的是:使用doGet和doPost方法的HTTPServlet处理一些请求(如何从这些方法中加载JSP页?)还可以加载静态内容(html、js、css)
按照我现在的设置方式,我只能选择其中一个,无法同时使用两个。
我来解释:
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();
谢谢
**编辑:**
我遇到的问题是,我的HTTP Servlet的行为方式如下: 处理所有请求,不给资源处理程序留下任何东西,因此当脚本请求.js脚本时,它返回一个空的html页面。 下面是一个例子: 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 });
在本例中,在没有主Servlet的情况下使用根处理程序时,它加载所有静态内容和jsp页面,但在添加主Servlet时,它不再加载任何静态内容,并使用空的html页面响应所有静态内容请求。
解决方案
当您使用Servlet时,Servlet链的末尾总是有一个终止。
可以是:
DefaultServlet
(使用完整的WebAppContext
时)Default404Servlet
(使用更简单的设置,如ServletContextHandler
时)
ResourceHandler
用于提供静态内容,请使用DefaultServlet
用于您自己的目的(这是一个更好的选择,而且还支持更多功能。例如范围请求、缓存、自动压缩、内存映射文件服务等)
示例:
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);
}
}
}
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