servlets

问题 So I'm dealing with a legacy servlet code that runs on Websphere 7 (JDK 6). Development environment setup uses Tomcat 6 (JDK 6). Why does it work on Websphere 7 and not in Tomcat 6? Is this something related to the application server? If your answer is yes for no. 2, do you have a workaround for this on Tomcat 6 (JDK 6) aside from breaking down the code or using dynamic includes? The schedule does not agree with changing static includes to dynamic includes primarily because most pages are

问题 I'm trying to accessing two http request parameters in a Java Servlet filter, nothing new here, but was surprised to find that the parameters have already been consumed! Because of this, it is not available anymore in the filter chain. It seems that this only occurs when the parameters comes in a POST request body (a form submit, for example). Is there a way to read the parameters and NOT consume them? So far I've found only this reference: Servlet Filter using request.getParameter loses Form

问题 I'm running a web application on Tomcat. I have a class that handles all DB queries. This class contains the Connection object and methods that returns query results. This is the connection object: private static Connection conn = null; It has only one instance (singleton). In addition, I have methods that execute queries, such as search for a user in the db: public static ResultSet searchUser(String user, String pass) throws SQLException This method uses the static Connection object. My

问题 I'm making a web-application with JSP and Servlets and I came accross this problem: I have a table users and a myeducations table. These table relationship is established on user_id. This is the table: myeducation ---------------------------------------------------------------------------------- | ed_id | user_id | school_name | year_attended_from | year_attended_to | degree | ---------------------------------------------------------------------------------- Now, I want to display on a

问题 Why was web.xml removed from servlet 3.0 ?, and the configuration is now done through Java. 回答1: Support for web.xml was NOT removed in Servlet 3.0, and (IMO) it is unlikely to be removed in the foreseeable future. Evidence? If you download the Servlet 3.0 spec and search for "web.xml", you will see lots of references to it. The most cogent quote is in A6.6 "A web application is NOT required to contain a web.xml if it does NOT contain any Servlet, Filter, or Listener components. In other

问题 Why was web.xml removed from servlet 3.0 ?, and the configuration is now done through Java. 回答1: Support for web.xml was NOT removed in Servlet 3.0, and (IMO) it is unlikely to be removed in the foreseeable future. Evidence? If you download the Servlet 3.0 spec and search for "web.xml", you will see lots of references to it. The most cogent quote is in A6.6 "A web application is NOT required to contain a web.xml if it does NOT contain any Servlet, Filter, or Listener components. In other

问题 I have a doubt: Is it possible to call a Java class with main() in JSP and print the value in console or JSP page (without use of a Servlet class)? Similarly print the value in JSP page from Java class with main() (without use of a Servlet class)? please need some explanation. 回答1: Since a typical main() method has return type void , this cannot be done: public staic void main(String[] args) { ... } But you call any static method on that class and return a String and output that to your JSP:

问题 I have taken name and password form user and compared it with my database if they match status is true if not its false.There is an additional column of role that the entered name can be user or admin if its admin I want some other page to open if it is user i want some other page.How should i do it. The following code checks admin since i have typed admin in the insert query what change or additional code i should write? There are 3 columns in my database(user,password,role).If the username

问题 I have taken name and password form user and compared it with my database if they match status is true if not its false.There is an additional column of role that the entered name can be user or admin if its admin I want some other page to open if it is user i want some other page.How should i do it. The following code checks admin since i have typed admin in the insert query what change or additional code i should write? There are 3 columns in my database(user,password,role).If the username

问题 I am using jquery $.post method to send a string to a servlet. var temp = "hsad d jad a....sad"; var str="testServlet?param="+temp; $.post(str, function(data) { alert("saved"); }); testServlet receives a call when the temp has less characters, say 5000. But when it has more no. of characters i.e. > 5000 it is not called. Firebug says 'Aborted'. I could not understand why. I thought that this might be because the above code is sending temp in the get form so I wrote like this - var temp =