This article mainly introduces the uniqueness of Ajax verification users and the verification environment Ajax Jquery Json struts2. Interested friends can refer to it

For beginners, learn the practical practice of Ajax verification of user uniqueness It is to consolidate the basic knowledge of Ajax, Jquery, Json and Struts2. The specific content is as follows

Browse the renderings:

Ajax verify user uniqueness

##Then let’s get started,

Operation stepsare as follows

1. First, we import the required packages and files

Json package:

Ajax verify user uniqueness

struts2 package:

Ajax verify user uniqueness

Introduce jquery-2.1.1.min .js files.

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2. Then, we need to configure the Struts2 filter in the web.xml file

 struts2 org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter   struts2 /*

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3. Then, start writing our login.jsp page, of course you can add some CSS styles to it to make it more beautiful. (I only did it briefly, a bit low)

Ajax+Jquery验证用户的唯一性

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4. Then, we started writing Action.

//验证用户的唯一性 public void isexist() throws IOException { boolean exist = name.equals("张三") ; JSONObject result=new JSONObject(); if(exist){ result.put("exist", true); }else{ result.put("exist", false); } ServletActionContext.getResponse().setContentType("text/html;charset=utf-8"); PrintWriter out=ServletActionContext.getResponse().getWriter(); out.println(result.toString()); out.flush(); out.close(); }

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5. Finally, write the Struts.xml file

  /login.jsp

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The above is me I compiled it for everyone, I hope it will be helpful to everyone in the future.

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