It’s worth checking these troubleshooting tips every time you get an error code for a Java Servlet button.

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    Just give the exclusive button elements a unique name. When you click a button, the name of the button becomes available as a query parameter, as is usually the case with input functions.

    Just specify that the button enters type = "submit" , as in , combined with , not type = "button" , which can only be done by a “dead” button, only from the point of view of onclick and that’s it .

      
      @WebServlet ("/ myservlet")Public class MyServlet HttpServlet exercise    @ Crush    protected empty doPost (HttpServletRequest, HttpServletResponse response) throws ServletException, IOException        MyClass myClass = MyClass (); new if (request.getParameter ("button1")! = null)            myClass.method1 ();         otherwise (request.! = getparameter ("button2") null)            myClass.method2 ();         completely different if (request.getParameter ("button3")! = null)           MyClass .method3 ();          different            // ???                request.getRequestDispatcher ("/ WEB-INF / some-result.jsp"). forward (request, response);     

    In qualityAlternatively use

      @WebServlet ("/ myservlet")public MyServlet extends HttpServlet    @ Crush    supports void doPost (HttpServletRequest, HttpServletResponse) fires ServletException, IOException        MyClass myClass = new MyClass ();        String device = request. getparameter ("button");       if ("button1" .equal (button))            myClass.method1 ();         otherwise if ("button2" .equals (button))            myClass.method2 ();         otherwise if ("button3" .equals (button))            myClass.method3 ();          different            // ???                request.getRequestDispatcher ("/ WEB-INF / some-result.jsp"). forward (request, response);     

    See Also:

    • Servlet returns “HTTP status 404. The requested resource (/ servlet) may not be available”
    • How to writeHow to feed an old element into a Java method using a cursor, hyperlink, or button on a JSP page?

    java servlet button

    Servlets are generic modules in the area of ​​Java code that, in a server application, ensure that they respond to requests from clients. It turns out they are not tied to a specific client-server protocol, but most often come from the HTTP protocol in use. The word “servlet” is primarily used in the sense of “” an http servlet. In this tutorial, I will explain and show you some tips for invoking a servlet method with one click.

    1. Presentation

    Servlet is any type of Java program that exists and exists on j2ee servers and should be used to receive a standard HTTP request, process it, and send a response back to the client. Servlets use standard Java extension classes in the javax.servlet and javax.servlet.http planes. Since Servlets are provided in the Java language with a high degree of portability and follow the standard they developed, you can see that complex server extensions are created differently in the device and in the operating system.me.

    • Processing and / or saving data uploaded via HTML and form.
    • Provides a dynamic record, that is, H. returns the best results from a database query to the client.
    • Manage shape information in addition to the current stateless HTTP, eg.

    Because servlet technology uses the Java language, servlet-based web applications are secure, scalable, and reliable.

    1.1 Servlet Architecture And Lifecycle

    A servlet, in its most general form, is an instance of a class that uses the javax.servlet.Servlet interface. However, most servlets extend one of the common implementations of this interface, namely javax.servlet.GenericServlet combined with javax.servlet.http.HttpServlet . In this tutorial, we will obviously only talk about the HTTP Servlet extensions that can classify javax.servlet.http.HttpServlet .

    To initialize any type of servlet, the server application drops the servlet class and creates a nice instance by calling the no-argument constructor. Then he calls the specialservlet method init (ServletConfig config) . The servlet must participate in a one-off configuration in the it method and register the ServletConfig template so that it can be registered later by calling the getservletconfig () can servlet method. This is handled by the corresponding GenericServlet . Extend servlets like GenericServlet (or a subclass of it like init method) to use this functionality.

     public nullify init (ServletConfig initiates configuration) ServletException

    The ServletConfig object contains the parameters of the servlet and a reference to the ServletContext of the servlet. The init method is guaranteed to be validated only once during the servlet’s lifecycle. It doesn’t have to be thread safe, because the service () method usually doesn’t work until a reference to the init () method is returned.

    When the corresponding servlet is initialized, its service (HttpServletRequest req, HttpServletResponse, or) method is called as on every servlet request. The method is called at the same time (that is, several dresses can call this method at the same time), becauseBut it can be implemented in a thread-safe way. The service () method then takes into account the doGet () or doPost () method, which is based on the HTTP type of the request. …

     public service void (HttpServletRequest req, HttpServletResponse or respectively) throws ServletException, IOException

    If a servlet that needs to be unloaded (for example, preparing to download a new version, the server will most likely shut down), its destroy () method is called. When the route destroy () is called, there may still be threads executing the entire service () method, so destroy () provides thread-safe. All resources that were actually assigned a type in the init () method are freed in the type of the destroy () method. This method is guaranteed to be called directly only once during the lifecycle of a particular servlet. Open

    Now go to the Eclipse idea and see which servlet method gets called when a new button is clicked.

    2. Sample Onclick Java Servlet

    2.1. Generating JSP Views

    java servlet button

    Servlet supports many example views forVarious display technologies. These include – JSP , HTML , XML , etc. So let’s prepare a simple view in JavaServletOnClick / src / main / webapp / . To use the shoulder joint with a Java servlet, we need to specify the attributes of the

    tag shortly after:

    • method = "post" : To submit form data to the host as a nice HTTP POST request. Typically, the form should be submitted using the HTTP POST method.
    • action = "Servlet-URL" : Specifies the relative URL of our servlet, which is responsible for processing most of the data sent by this form.

    Typically add the following code to call the servlet from a new JavaScript function:

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  •  OnClick  Sample Servlet 

    Sample OnClick Servlet

    UsernameBody:

    3. Run The Application

    Since we are ready for any changes, I would say that we will compile the push out and deploy the application to the Tomcat7 server. Open your favorite phone and click the following url. The output is displayed.

    Enter your login name and submit the form. Developers will see that when the button is clicked, the form continues to submit to the servlet. I would say the following log is displayed in the console.

    All JavaScript

     options are provided as examples onClick. Name submitted? = Jcg

    4. Conclusion

    In this section, the developers learned exactly how a servlet can be invoked by any type of button click. Developers can download the application as an Eclipse Build Project from the Downloads section. I’m optimistic that this article has served you everything the designers were looking for.

    5. Download The Project

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