如何检查唯一身份用户？ [英] How to Check for a Unique User?

问题描述

我有任何应用程序，其中 email_id 是唯一的，每当最终用户输入 email_id 时我通过Ajax发出了一个SQL查询，检查这个电子邮件ID 是否存在。直到这里它的工作正常，但现在我在 email_is 存在时，那么我想在JSP页面上显示这个id已被采用，反之亦然。

I'm having any application in which I have email_id as unique and whenever an end user enters his email_id I have fired an SQL query through Ajax which check whether this email id exists or not. Until here its working fine but now I what that is when email_is exists then I want to display on the JSP page that This id is already taken and vice-versa.

所以我的问题是如何从struts应用程序获取响应并将其提供给Ajax或JSP页面以及在struts.xml结果标记中写入什么内容？

So my question is how to get the response from struts app and give it to Ajax or JSP page and what to write in "struts.xml" result tag?

这是我对 EmailCheck.action的Ajax调用：

$("#email").blur(function() {
      var EmailV = $("#email").val();
        if(EmailV.length > 10){
            $('#Loading').show();
            $.get("EmailCheck.action", {
                Email_Id: EmailV   
            }, function(response){
                $('#Info').fadeOut();
                $('#Loading').hide();
                setTimeout("finishAjax('Info', '"+escape(response)+"')", 450);
            });
            return false;
        }
    });

这是我的 struts.xml 应该在那里是此电子邮件类型检查程序的结果标记？

This is my struts.xml should there be result tag for this Email type checker?

 <action name="EmailCheck"  class="org.register.customers.EmailCheckAction" method="EmailCheck">
          <result name="input">index.jsp</result>
          <result name="success">success.jsp</result>
          <result name="error">error.jsp</result>
  </action>

这是我的行动代码：

 public String EmailCheck() throws Exception{

     System.out.println(user.getEmail_Id());

       boolean create = Check_Email(user);

 //  "this is my sql call to check the existence of email"

    if (true) {       

        return "input";
    } else {          

        return ERROR;
    }        
}

推荐答案

如果如果您调用Ajax操作，则可以返回调度程序结果。在这种情况下，呈现的JSP片段将作为响应输出。此外，您还可以选择返回流， json 或无结果。对于您的情况，我会考虑第一个选项。首先查看此答案，让您熟悉如何返回流 text / html 内容类型的结果。然后在JSP中你应该创建一个目标div来放置响应。

If you call an Ajax action you can return a dispatcher result. In this case a rendered JSP fragment will output as a response. Also, you have options to return a stream, json, or none results. To your case I will consider the first option. First look at this answer to get you familiar how to return a stream result with text/html content type. Then in the JSP you should create a target div where you put the response.

<div id="result"/>

现在修改你的JS以将结果插入div。

now modify your JS to insert result into div.

}, function(response){
  $("result").html(response);

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