servlets

问题 I would like to map a servlet to serve the requests that includes 'app' and ends with *.html in the following way <url-pattern>/app/*.html</url-pattern> but on running the application it gives me an error java.lang.IllegalArgumentException: Invalid <url-pattern> /app/*.html in servlet mapping please help me to map that. And please provide me the links where I can learn about these url mapping rule and conventions. 回答1: This is indeed invalid. The wildcard has to be the first or the last

问题 I would like to map a servlet to serve the requests that includes 'app' and ends with *.html in the following way <url-pattern>/app/*.html</url-pattern> but on running the application it gives me an error java.lang.IllegalArgumentException: Invalid <url-pattern> /app/*.html in servlet mapping please help me to map that. And please provide me the links where I can learn about these url mapping rule and conventions. 回答1: This is indeed invalid. The wildcard has to be the first or the last

问题 I like to know why dont we call servlet constructor instead of init method to initialize the config parameters. THanks 回答1: This thread should clarify the differences. Quoting from one of the more illuminating posts: The init() method is typically used to perform servlet initialization--creating or loading objects that are used by the servlet in the handling of its requests. Why not use a constructor instead? Well, in JDK 1.0 (for which servlets were originally written), constructors for

问题 I like to know why dont we call servlet constructor instead of init method to initialize the config parameters. THanks 回答1: This thread should clarify the differences. Quoting from one of the more illuminating posts: The init() method is typically used to perform servlet initialization--creating or loading objects that are used by the servlet in the handling of its requests. Why not use a constructor instead? Well, in JDK 1.0 (for which servlets were originally written), constructors for

问题 I'm running Tomcat in Eclipse. I would like to see the Tomcat home page, however it doesn't show up. When I browse http://localhost:8080 , then I get a HTTP 404 Page Not Found error. How is this caused and how can I solve it? 回答1: Eclipse does by default not use Tomcat standalone. Instead, it overtakes its sole server engine and uses the workspace as deployment space instead of Tomcat's own /webapps folder. It also creates copies of configuration files like server.xml in the Servers project.

问题 This question already has answers here : How to detect the timezone of a client? (4 answers) Closed 2 years ago . I need to convert my server time to the user's time depending on their time zone. Is this the best way to figure out their timezone - by using the HttpServletRequest object? Locale clientLocale = request.getLocale(); Calendar calendar = Calendar.getInstance(clientLocale); TimeZone clientTimeZone = calendar.getTimeZone(); 回答1: Unfortunately you cannot get the user's timezone from

问题 This question already has answers here : How to detect the timezone of a client? (4 answers) Closed 2 years ago . I need to convert my server time to the user's time depending on their time zone. Is this the best way to figure out their timezone - by using the HttpServletRequest object? Locale clientLocale = request.getLocale(); Calendar calendar = Calendar.getInstance(clientLocale); TimeZone clientTimeZone = calendar.getTimeZone(); 回答1: Unfortunately you cannot get the user's timezone from

问题 i am new to java, i'm having problem passing value from a class/bean (which are stored in arraylist) to servlet. any idea how can i achieve that? below is my code. package myarraylist; public class fypjdbClass { String timezone; String location; public String getTimezone() { return timezone; } public void setTimezone(String timezone) { this.timezone = timezone; } public String getLocation() { return location; } public void setLocation(String location) { this.location = location; } public

问题 I'm trying to put CSS, JS and IMGs on my JSP, but doesn't work, it's strange because I use c:url and "jstl/core" I'm use JSP, jstl and servlet, no frameworks. <%@page contentType="text/html" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <%@taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>clientes atuantes</title> <link rel="stylesheet"

问题 I am trying to create instance of class javax.servlet.ServletException with following code public class MyTroubleViewer { public static void main(String[] args) { javax.servlet.ServletException servletException = new javax.servlet.ServletException("Hello"); System.out.println(servletException.getMessage()); } } But I get exception on creating: Exception in thread "main" java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/servlet