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I am new to Struts 2, I have already worked in Struts 1.
How can we create an error message with a one-piece user interface (like a text box) for daily fat intake? I don’t want the error word to be global.
ActionErrors matches errors new ActionErrors ();if (userName! = null && userName.length () <= 0) error.add ("userName", new ActionError ("error.userName.required"));
In Struts If 1, I extend the action class with ActionSupport and use this:
addActionError (getText ("Please provide a user ID"));
Then it looks like this is a special global message that can be displayed in the user interface with:
So, know how to get the same functionality in Struts 2. Please let me know now.
Struts 2 offers many custom tags for development in addition to the previously explored data tags, tag controls, and user interface tags. Today we will look at two tags related to the reaction of the classsa motions that we can use on the results pages.
- actionerror This draw: tag is used in conjunction with action class validation for form industries. If validation fails for any of the web form fields, we can take action in the event of an error and then use the Struts 2 API before requesting
. Add
The following tutorial explains how to use the ActionErrors class in Struts web applications and also explains how errors generated by the valid () ActionForm method are displayed in a JSP profile. ActionErrors is the class passing the org.apache.struts.action.ActionMessages class. It adds errors generated by the validate () method or multiple methods returning ActionError or pro ActionForm. Errors (ActionError objects) are proposed in the ActionErrors of the instance using the "Contribute" method, which has the form immediately after.
public void add (java.lang.String property, ActionError)
- This method is deprecated. You can get add (String, ActionMessage) instead.
Property - Resource Name (or ActionErrors.GLOBAL_ERROR) - to decide that all validation errors are either global for the entire ActionForm component with whichWhether they are clearly related, or that they are only related to a specific property of the component.
Each error is represented by an ActionError object that contains the message key and up to four arguments, even as replacement values for replacement, usually in the resulting message.
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public ActionError (key java.lang.String, java.lang.Object value0, java.lang.Object value1, java.lang.Object value2, java.lang.Object value3)
where key is the message key to receive this error message, and value0 is the first replacement value, value1 is the immediate replacement value, value2 is the next replacement value, value3 is the next replacement value, where value0, value1, value2, value3 is optional.
requiredFields = "Login and Password"new ActionError ("fields.required", required fields)
where fields.required is the message key and therefore the required fields are the message text (1st parameter value) used to replace when working with 0, the resulting error message is displayed before it in the JSP.
Message keys, corresponding error messages, and installation options (0, 1, 2, 3, which are optional) mustbe saved to track the properties of the message. This example uses the ApplicationResources.Is properties as the message resource file. This can be the resource directory or copy the ApplicationResources.properties file to activate it in the WEB-INF classes resources (or JavaSource resources) folder in the web application and in the
The required line in ApplicationResources.properties for ActionError ("fields.required", required fields) looks like this.
ActionErrors has a conceptual request field. Once errors have been added to the instance by the actual validate () method, they are immediately saved in the request, which uses saveErrors (request, error) while it is in the action class. Later, the jsp page can get the request subject and use the ActionError objects it contains to display error messages. Errors added by your current ActionErrors object can be viewed using the JSP Error
In the ActionForm, write the following code. Occasionally, object action errors can be returned by a valid (.. Method) or some other special method, such as ValidateLogin (..), as described below. The "validate" method is continually called by the controller servlet whenever the properties of the bean are visited, but before calling the corresponding fun class, the method is called. class tactics of manual actions when needed.
Check for ActionErrors public connection error (ActionMapping, HttpServletRequest)
public ActionForward processLogin (ActionMapping applied, ActionForm, HttpServletRequest, HttpServletResponse response)throws an exceptionActionErrors Errors New = ActionErrors ();ActionForward to New = ActionForward ();LoginForm loginForm means (LoginForm) -Form;Error = loginForm.validateLogin (mapping, request); if (errors.isEmpty ())Connection handling..........strTarget = "loginSuccess";differentsaveErrors (request, error);strTarget means "Connection Error";forward = destination.findForward (strTarget);back forward);The software to fix your PC is just a click away - download it now.
