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11256446
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2012-06-29T05:23:34.630
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2012-06-29T05:29:46.160
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2012-06-29T05:29:46.160
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Personally I use reflection in my controllers(servlets) which basically let me achieve this. If I have a servlet called UserController The main url to call the servlet will be /user. Knowing this, I always pass my first parameter as ?action=add Then in my servlet I have a method called add or actionAdd. Whichever you prefer. Then I use the following code; <pre><code>String str = String str = request.getParameter("action").toLowerCase(); Method method = getClass().getMethod(str, HttpServletRequest.class, HttpServletResponse.class); method.invoke(this, request, response); </code></pre> Explanation: str will have the action parameters value, add in this case. Method method will be a reference to a method with the given name(str) and its expected parameter types. I then invoke the method, passing the context, request and response. The add method would look something like this; <pre><code>public void add(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException { //do add stuff String url = "/user/index.jsp"; RequestDispatcher dispatcher = context.getRequestDispatcher(url); request.setAttribute("User", user); dispatcher.forward(request, response); } </code></pre> I don't know about only passing back a string. But this should get you a basic idea. Do note that reflection can cost you, altohugh it shouldnt really affect you much like this. And it is error prone as method names/signatures need to match perfectly. So from jquery you would do an ajax request to the url: <pre><code> localhost/projectname/user/add (if you use urlrewrite) or localhost/projectname/user?action=add (if you dont) </code></pre>
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1. POJava Servlet and Jquery
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1. USJoey Roosing
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1. USJoey Roosing
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