java.lang.IllegalStateException：没有SessionManager

请给我建议如何正确设置Jetty。 我正在使用最新版本的jetty（9.0.6.v20130930）。 我订购了服务器实现具体的servlet，它不起作用！ 我已经和Jetty做了一点工作，没有看到类似的东西。

– Main.class

public static void main(String[] args) throws Exception { MessageSystem ms = new MessageSystem(); Frontend frontend = new Frontend(ms); (new Thread(frontend)).start(); Server server = new Server(8080); server.setHandler(frontend); server.start(); server.join(); } 

– Frontend.class

 public class Frontend extends AbstractHandler implements Runnable, Abonent { ... constructor and others methods... public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { setResponseSettings(baseRequest,response); PrintWriter out = response.getWriter(); try { int id; HttpSession session = request.getSession(); if( session.isNew()){ id = setSessionId(session); pageContent = "Hello new user! Your id: "+id; out.println(new Page().enterName()); }else{ id = getSessionId(session); pageContent = "Hi! I remember you. You are: " +id; out.println(new Page().normalContent()); } } catch (IllegalStateException ex){ System.out.println("Exception!"+ex); } out.println("
" + pageContent + "
"); Iterator iterator = listStrings.iterator(); while (iterator.hasNext()){ out.println("
"); out.println("Your text from TextField: "+iterator.next()); } out.close(); } 

– Сonsole

 2013-11-01 04:06:24.273:INFO:oejs.Server:main: jetty-9.0.6.v20130930 2013-11-01 04:06:24.309:INFO:oejs.ServerConnector:main: Started ServerConnector@358e0f79{HTTP/1.1}{0.0.0.0:8080} Exception!java.lang.IllegalStateException: No SessionManager Exception!java.lang.IllegalStateException: No SessionManager 

Answer 1

你错过了3件事。

• 一个上下文
• 会话ID管理器
• 会话处理程序 （带有关联的会话管理器 ）

Main.java

 import org.eclipse.jetty.server.Server; import org.eclipse.jetty.server.handler.ContextHandler; import org.eclipse.jetty.server.session.HashSessionIdManager; import org.eclipse.jetty.server.session.HashSessionManager; import org.eclipse.jetty.server.session.SessionHandler; public class Main { public static void main(String[] args) { MyDumpHandler dump = new MyDumpHandler(); Server server = new Server(8080); // Specify the Session ID Manager HashSessionIdManager idmanager = new HashSessionIdManager(); server.setSessionIdManager(idmanager); // Sessions are bound to a context. ContextHandler context = new ContextHandler("/"); server.setHandler(context); // Create the SessionHandler (wrapper) to handle the sessions HashSessionManager manager = new HashSessionManager(); SessionHandler sessions = new SessionHandler(manager); context.setHandler(sessions); // Put dump inside of SessionHandler sessions.setHandler(dump); // Tree is now // Server // + ContextHandler("/") // + SessionHandler(Hash) // + MyDumpHandler try { server.start(); server.join(); } catch (Throwable t) { t.printStackTrace(); } } } 

MyDumpHandler.java

 import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.eclipse.jetty.server.Request; import org.eclipse.jetty.server.handler.AbstractHandler; public class MyDumpHandler extends AbstractHandler { public void handle(String target, Request baseRequest, HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { PrintWriter out = response.getWriter(); response.setContentType("text/plain"); try { HttpSession session = request.getSession(); if (session.isNew()) { out.printf("New Session: %s%n", session.getId()); } else { out.printf("Old Session: %s%n", session.getId()); } } catch (IllegalStateException ex) { out.println("Exception!" + ex); ex.printStackTrace(out); } out.close(); } }