servlets

问题 This question already has an answer here : What is the difference between a Servlet filter and a Jersey filter? (1 answer) Closed yesterday . I'm planning on writing a servlet application (meant for deployment with OSGI) and use some filters for HTTP header pre-processing. While originally settled on the javax.servlet filter implementation, it occured to me that I actually don't know why/when one would choose to use that vs the Jersey ContainerRequestFilter. Granted the latter comes with some

问题 I facing problems when I'm trying to fetch data from Servlet. When I call the servlet by: function urlFetchRequest(str, body = null, RequestType = 'GET'){ try { asyncRequest = new XMLHttpRequest(); asyncRequest.addEventListener("readystatechange", stateChange, false); asyncRequest.open(RequestType, str, true); // /Test is url to Servlet! asyncRequest.send(body); } catch(exception) { alert("Request failed"); } } I get back the information I need from the Servlet, and can use it by: jsonRes =

问题 I facing problems when I'm trying to fetch data from Servlet. When I call the servlet by: function urlFetchRequest(str, body = null, RequestType = 'GET'){ try { asyncRequest = new XMLHttpRequest(); asyncRequest.addEventListener("readystatechange", stateChange, false); asyncRequest.open(RequestType, str, true); // /Test is url to Servlet! asyncRequest.send(body); } catch(exception) { alert("Request failed"); } } I get back the information I need from the Servlet, and can use it by: jsonRes =

问题 Helo masters, I have to create a JNDI Datasource dynamically, I tried to do it with a listener called SetupApplicationListener. Here is the beginning of WEB-LIB/web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee"> <display-name>pri-web</display-name> <!-- Listeners --> <listener> <listener-class>org.apache.myfaces.webapp

问题 Helo masters, I have to create a JNDI Datasource dynamically, I tried to do it with a listener called SetupApplicationListener. Here is the beginning of WEB-LIB/web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee"> <display-name>pri-web</display-name> <!-- Listeners --> <listener> <listener-class>org.apache.myfaces.webapp

问题 Recently I've been digging into an issue that has lead me the "mime-mapping" element defined in the web-common_X_X.xsd and utilized in a web apps web.xml file. My goal here is to configure Tomcat to include a specific Content-Type header when returning a response to a specific servlet. I've found previous stack overflow posts mentioning the functionality, but I'm unable to get a trivial example to work with Tomcat 8.0.33. For this test, I've created the following servlet: public class

问题 I have 2 jsp pages and one Servlet . I am fetching data from database by servlet and sending result to result.jsp page where i am displaying result. But i want to add a Back button in result.jsp , by clicking back button i want to go to index.jsp , but problem is when i am clicking back button everytime a message is coming Confirm form submission and it is irritating me. How can i avoid this Confirm form submission ? perhaps it is coming as processing is done in servlet. index.jsp <form

问题 I have 2 jsp pages and one Servlet . I am fetching data from database by servlet and sending result to result.jsp page where i am displaying result. But i want to add a Back button in result.jsp , by clicking back button i want to go to index.jsp , but problem is when i am clicking back button everytime a message is coming Confirm form submission and it is irritating me. How can i avoid this Confirm form submission ? perhaps it is coming as processing is done in servlet. index.jsp <form

问题 I am new to Java and I developed a sample Java EE application that works with normal Java client, but it does not work with Servlets. I developed EE project in Netbeans IDE with an Application Client, EJB module and Web module. Customer.java @Entity @Table(name = "customer") public class Customer implements Serializable { private static final long serialVersionUID = 1L; @Id @Column (name="id") private String id; @Column (name="name") private String name; public void setName(String name) {

问题 I have a few Java servlets (3.x - Tomcat 8) running that generate and return PDF documents. I've never had any problems with any of them. I recently wrote a new servlet to also create and return a PDF document, and this new servlet is using the exact same piece of response code as the others are using: response.reset(); response.setContentType("application/pdf"); response.setHeader("Content-Transfer-Encoding", "binary"); response.setHeader("Content-Disposition","attachment; filename=\""