servlets

问题 My code currently tries to ping a URL the user provide. It works fine with non-HTTPS websites. But if I try with something like: https://www.httpsnow.org/ I get an exception: Could not establish connection. Error is: 'sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target' Code below: try { long startTime = DateProvider.getCurrentTimeMillis(); huc =

问题 My code currently tries to ping a URL the user provide. It works fine with non-HTTPS websites. But if I try with something like: https://www.httpsnow.org/ I get an exception: Could not establish connection. Error is: 'sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target' Code below: try { long startTime = DateProvider.getCurrentTimeMillis(); huc =

问题 I am tryin to get the credentials from jsp page-index.jsp In my servlet-LoginServletwhen under package dao i use String userName = request.getParameter(usrnm_gtalk); String password = request.getParameter(password_gtalk); it says usrnm_gtalk and password_gtalk cannot be resolved. in my jsp <form name="LoginForm" method="post" action="/dao/LoginServlet> <input type="text" name="usrnm_gtalk"/> <input type="password" name="password_gtalk" /> web.xml <welcome-file-list> <welcome-file>index.jsp<

问题 This question already has answers here : How to use Servlets and Ajax? (7 answers) Closed 3 years ago . I am trying to get data from servlet to ajax in post but it always go to error part that saying like "undefined" am new to ajax kinldy help on this. Insert part working good but am trying to fetch value to go error part?? servlet package Servlet; import java.io.IOException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException

问题 I dont understand this error 500 and cookie problem, hoping someone can inlight me. When i run my requestDispatcher i get an internal erro 500 that i cant figure out. The ressource is /WEB-INF/jsp/index.jsp but in the error message it says /WEB-INF/jsp/cookie??? The error message HTTP Status 500 - javax.servlet.ServletException: javax.servlet.jsp.JspException: java.io.FileNotFoundException: The requested resource (/MyNewRandomBlog1.0/WEB-INF/jsp/{cookie=JSESSIONID

问题 I am using tomcat 7 and net beans IDE 7.3.1 for my project. My servlet program is working fine on Mozilla Firefox and Internet Explorer.but when i m running it on Google chrome it shows following error. HTTP Status 500 - type Exception report message description The server encountered an internal error that prevented it from fulfilling this request. exception java.lang.NullPointerException Controller.CreateQuestion.doPost(CreateQuestion.java:200) javax.servlet.http.HttpServlet.service

问题 i use spring 3.0, in a jsp, i try to display data and a chart... @Controller @RequestMapping("/user.htm") public class UserController { @Autowired private IUserService userService; @RequestMapping(method = RequestMethod.GET) public ModelAndView user(HttpServletRequest request, HttpServletResponse response) { ModelAndView modelAndView = new ModelAndView("user"); modelAndView.addObject("statUser", userService.getStatUser()); return modelAndView; } public void generateChart(HttpServletRequest

问题 I am getting a seemingly inexplicable nullPointerException from a .jar file that is listed in the classpath as an export dependency. The jar file consists of a database bean that works flawlessly when it is called inside of a normal main method POJO, but when I called the same jar file in a servlet, I get null pointers from the con.prepareStatement of whatever I call. I thought that it might be a SQLException from the pool causing it, so I moved it to our VM server where it can talk directly

问题 I am assigning href to a button and passing a value to the controller JSP page <td><a href="viewController?book_id=<%=vo.getBookId()%>"><input type="button" name="remove" value="DELETE"/></a> </td> In controller, I am trying to get the value when the button is clicked using: if(request.getParameter("remove") !=null) { int cart_id=(Integer)request.getSession(false).getAttribute("cartid"); b_id = (String) request.getParameter("book_id"); int bid=Integer.parseInt(b_id); System.out.println(bid);

问题 I would like to get rid of the printWriter code in the servlet. Basically I want to output the current customers and their respective cities with the id which is a hidden field on the index page. From there I would like to be able to edit the customer name or city and then have it sent back to the index page where the information would be updated. How do I do this? Servlet package edu.witc.Assignment02.controller; import java.io.IOException; import java.io.PrintWriter; import java.util