servlets

问题 I am trying to do this Service Interface: Boolean SaveObjectIntoDatabase(Object Entity); ServiceAsync: void SaveObjectIntoDatabase(Object Entity,AsyncCallback <Boolean> Callback); then implementing it on the serviceimpl with no success. Is it that we cannot send a variable of type object via GWT RPC?? stack trace: onModuleLoad() threw an exception Exception while loading module com.BiddingSystem.client.BiddingSystem. See Development Mode for details. java.lang.reflect

问题 I have a design question :) I want to have multiple servlets but I dont want to configure a new servlet with a new name each time and extend the HttpServlet. I was thinking of having a generic servlet which dispatches different parameters to different specific classes that are actually handling the request. Ex: theese two calls will be handled by the same generic servlet but dispatched to different services (classes). /serviceservlet?action=action1&param1=test1&param2=test2 /serviceservlet

问题 I have a design question :) I want to have multiple servlets but I dont want to configure a new servlet with a new name each time and extend the HttpServlet. I was thinking of having a generic servlet which dispatches different parameters to different specific classes that are actually handling the request. Ex: theese two calls will be handled by the same generic servlet but dispatched to different services (classes). /serviceservlet?action=action1&param1=test1&param2=test2 /serviceservlet

问题 I create a servlet to download a specific text which the client post with a form before (in a textarea)... The form in the client side is nothing speciel: form = new FormPanel(); form.setMethod(FormPanel.METHOD_POST); form.setAction(GWT.getModuleBaseURL() + "services/export"); exportButton = new Button(resource.SUBMENU_Export(), new ClickHandler() { public void onClick(ClickEvent event) { form.submit(); } }); And this is the code at the server side (serlvet): package com.server.servlet;

问题 I developed a chat application using java.But now my challenge is build a chat app in web application.I dont how to proceed.Can we use sockets as done in java. Please give me a suggestion to get through this. Thanks in Advance. 回答1: I recommend you to use websockets as they're really efficient to exchange in real time (push instead of pull) data between a server and html clients. They're bidirectionnal and roughly equivalent to the sockets you're used to (hence their name). Client-side, they

问题 Have a working Spring REST endpoint using Tomcat 7, running using JDK 1.7. Built using gradle, where build.gradle has dependencies on Spring libraries v4.1.6, and javax.servlet v3.0.1 amongst other things. Added a new method with a simplistic implementation to the @Controller class, which returns value of DeferredResult<String> . When I send a GET request to the endpoint and the new method is invoked, around the time it returns a value I see the following exception logged in server logs: (see

问题 Is there a full documentaion of the deployment descriptor that describes each element and each sub-element? I realy can't find it. P.S. I ask because I found the way to set maxAge of session cookies by adding <session-config> <session-timeout>525600</session-timeout> <cookie-config> <max-age>31536000</max-age> </cookie-config> </session-config> into DD. But I cannot find any official documentation that describes <cookie-config> element. 回答1: For the standard Java EE deployment descriptor

问题 I am observing a strange behaviour with the java.io.BufferedReader's ready method which returns false inside Tomcat while it returns true when the same servlet is run within Jetty. BufferedReader bufferedReader = httpRequest.getReader(); System.out.println(bufferedReader.ready()); /** Perform some read operation */ Output: true //Jetty false //Tomcat I understand that the BufferedReader#ready method only indicates if the next read is not going to blocked for the input(true) or not(false), but

问题 When I reference to a DTD file in my code, I don't know how to reference to it within my project's folder. e.g : If my project's name is Moo , I'd want to refernce the DTD at /Moo/WEB-INF/courses.dtd . TransformerFactory transfac = TransformerFactory.newInstance(); Transformer trans = null; try { trans = transfac.newTransformer(); } catch (TransformerConfigurationException e) { } trans.setOutputProperty(OutputKeys.INDENT, "yes"); trans.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "/Moo/WEB

问题 When I reference to a DTD file in my code, I don't know how to reference to it within my project's folder. e.g : If my project's name is Moo , I'd want to refernce the DTD at /Moo/WEB-INF/courses.dtd . TransformerFactory transfac = TransformerFactory.newInstance(); Transformer trans = null; try { trans = transfac.newTransformer(); } catch (TransformerConfigurationException e) { } trans.setOutputProperty(OutputKeys.INDENT, "yes"); trans.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM, "/Moo/WEB