CODEWITHSUNDEEP
javajavascriptservletsstruts2
NPException
NPException

Reputation: 59

How to invoke a servlet from AJAX call url in struts2 application?

I am developing a simple Struts2 application having AJAX call. I am trying to check each field of a form, while it is being filled up, using AJAX call. I want to get the response from a servlet. To call the servlet, I have used 'exclude url' in struts.xml file and included the ajax call pattern in web.xml file. But my application is unable to find out the servlet. Below are the code snippets:

empForm.jsp:

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script src="util.js" type="text/javascript"></script>
<script src="validate.js" type="text/javascript"></script>
<title>Employee Registration Form</title>
</head>

<body>
    <h1 align="center">Employee Registration Form</h1>
    <h2 align="left">Please provide your details in the appropriate fields. Fields marked with * are mandatory. </h2><br><br>
    <s:form action="register">
        <s:textfield id="username" name="username" label="Username*" />
        <s:textfield name="fullname" label="Full Name*" />
        <s:textfield name="emailid" label="Email*" />

validate.js:

window.onload = initPage;
alert("validate.js page");

function initPage() {
  document.getElementById("username").onblur = checkUsername;
  //document.getElementById("register").disabled = true;
  alert("in initPage();");
}

function checkUsername() {
    request=createRequest();
    if(request==null)
        alert("Unable to create request!");
    else{
        var theName = document.getElementById("username").value;
        var username = escape(theName);
        var url = "http://localhost:8080/PeopleManagement/checkName.do?username=" + username;
        //var url = "checkName.do?username=" + username;
        request.onreadystatechange = showUsernameStatus;
        request.open("GET",url,true);
        request.send(null);
        alert("url:" + url);
    }
    alert("in checkUsername();");
}

function showUsernameStatus(){
    if(request.readyState == 4){
        if(request.status == 200){
            alert("Status:" + request.statusText);
            alert("Response:" + request.responseText);
            if(request.statusText == "okay"){
                alert("allowed");
            }
            else
                alert("denied");
        }
    }
}

struts.xml:

<package name="admin" extends="struts-default">
    <action name="Welcome">
        <result>/welcome.jsp</result>
    </action>
    <action name="Admin" class="com.admin.AdminUser" method="execute">
        <result name="input">/adminLogin.jsp</result>
        <result name="SUCCESS">/adminMenu.jsp</result>
    </action>
</package>
<package name="registration" extends="struts-default">
    <action name="register" class="com.emp.Employee" method="execute">
        <result name="input">empForm.jsp</result>
        <result name="error">/registrationError.jsp</result>
        <result name="SUCCESS">/registrationSuccess.jsp</result>
    </action>
    <action name="viewemp" class="com.emp.ViewEMP" method="execute">
        <result name="error">/viewError.jsp</result>
        <result name="SUCCESS">/list.jsp</result>
    </action>
</package>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>PeopleManagement</display-name>
  <welcome-file-list>
    <welcome-file>welcome.jsp</welcome-file>
  </welcome-file-list>

  <filter>
      <filter-name>struts2</filter-name>
      <filter-class>
         org.apache.struts2.dispatcher.FilterDispatcher
      </filter-class>
  </filter>

  <filter-mapping>
     <filter-name>struts2</filter-name>
     <url-pattern>/*</url-pattern>
  </filter-mapping>

  <servlet>
    <servlet-name>UserValidator</servlet-name>
    <servlet-class>com.validation.ValidateUser</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>UserValidator</servlet-name>
    <url-pattern>/checkName.do*</url-pattern>
  </servlet-mapping>

</web-app>

please help me out.

Upvotes: 1

Views: 1261

Answers (1)

ramp
ramp

Reputation: 1256

You need to map your Servlet correctly in web.xml

<servlet-mapping>
  <servlet-name>UserValidator</servlet-name>
  <url-pattern>/PeopleManagement/checkName.do</url-pattern>
</servlet-mapping>

.........

[EDIT] You will also have to edit /* to / for the struts interceptor servlet. The difference is explained here - Difference between / and /* in servlet mapping url pattern

Upvotes: 2

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