[ad_1] Declare the variable OUTSIDE a the get/post method scope, you will then be able to increment it on each call to the servlet. See below: private int counter; private Object lock; public void init() throws ServletException{ //init lock lock = new Object(); // create variable counter = 0; } public void doGet(HttpServletRequest request, HttpServletResponse … Read more
[ad_1] You have given no HTML or any script you have tried yourself as such the below should serve as a good template for you to get started. DEMO – Cascading dropdowns, show managers for selected department Assuming the following HTML <div> <div style=”float: left;”> Select Department <br /> <select id=”departments”></select> </div> <div style=”float: left; … Read more
[ad_1] You have to address the name Attribute of your input Elements Serverside. So if you would have <input type=”text” name=”username” id=”userelementid”> then you would still use request.getParameter(“username”) 0 [ad_2] solved which should i use in request.getParameter in servlet? [duplicate]
[ad_1] Your query looks like this: “SELECT E.username FROM MyUser E” The E.username part will return a list of username Strings. It should be From MyUser to get MyUser objects. Something like: List<MyUser> p1 =sn.createQuery(“FROM MyUser”).list(); 1 [ad_2] solved java.lang.ClassCastException: java.lang.String cannot be cast to
[ad_1] The service locator pattern can be used for looking up services as described in Core J2EE Patterns. Please notice that this pattern can be considered a bit “outdated” and arguably dependency injection should be preferred in most cases (see here for a more elaborate discussion). [ad_2] solved j2ee pattern for centralizing the process of … Read more
[ad_1] You should get an SMS provider for this. They also provide you with an API for their own service, there is no free “out there” API for this. [ad_2] solved Sms API for java web application? [closed]
[ad_1] The jsondata value is JSON text. It starts with [, which means it’s a JSON array. To process it, you should use a JSON parser. See How to parse JSON in Java. Once you have parsed it, you should have a String[] or a List<String>, with 2 values. Both values start with data:image/jpeg;base64, followed … Read more
[ad_1] Answer Hashtable.contains() Tests if some key maps into the specified value in this hashtable. So, within your Servlet at this line if(!playerList.contains(playerid)) { you’re actually comparing a key (playerid) with all the values (Player objects) in your Hashtable. Hence, the match is failing every time. Your ServletContext (as well as its listener) works fine … Read more
[ad_1] Filters help you to intercept the incoming request and response. Request filters can: perform security checks, reformat request headers or bodies, audit or log requests, Response filters can: compress the response stream, append or alter the response stream, create a different response altogether. [ad_2] solved What are the real time usage of Filter concept … Read more
[ad_1] StringWriter sWriter = new StringWriter(); PrintWriter out = new PrintWriter(sWriter); out.println(“Hello World”); response.getWriter().print(sWriter.toString()); This creates a StringWriter that is independent of the response. It creates a String with the content you put in it and then takes that and puts it into PrintWriter of the response. PrintWriter out = response.getWriter(); This just gets the … Read more
[ad_1] You are missing the Project name/context path in your url: http://localhost:8080/ProjectName/sayhello [ad_2] solved HTTP status: 404 – Java Servlet [closed]
[ad_1] Use UTF-8 instead. It’s understood by every self-respected client side and server side operating system platform. It’s also considered the standard character encoding these days. Tomcat still defaults to the old ISO 8859-1 charset as to decoding GET request parameters and to the server platform default encoding as to decoding POST request parameters. To … Read more
[ad_1] i think you should try this public class EmpBean { public java.util.List dataList(){ ArrayList list=new ArrayList(); try{ Class.forName(“driver”); Connection con = DriverManager.getConnection(“url”, “user”, “pwd”); Statement st=con.createStatement(); System.out.println(“hiiiii”); ResultSet rs=st.executeQuery(“select * from employee”); while(rs.next()){ list.add(rs.getString(“name”)); list.add(rs.getString(“address”)); list.add(rs.getString(“contactNo”)); list.add(rs.getString(“email”)); } System.out.println(rs.getString(“contactNo”)); } catch(Exception e){} return list; } } Assuming this class working fine and it is … Read more
[ad_1] Your error is on line 73: birthyear = Integer.parseInt(request.getParameter(“birthyear”)); I’m guessing by your code that the form in the doGet function is the form posting the data you want to store in your database. Your form doesn’t contain a birthyear field. Its absence makes request.getParameter(“birthyear”) return null, which causes a NullPointerException when trying to … Read more
[ad_1] MultipartFile’s getInputStream() method returns an InputStream. You don’t have to know what kind of InputStream it returns. As you see, it’s not a FileInputStream, and that should not matter. All you need to do is read from the InputStream returned and write to your file. You read from an InputStream the same way, whatever … Read more