Question

I wish to call a java class method from JSP whenever I submit my form.
My JSP file will have a file tag.
User will browse a file from his local machine. And click on Submit.
This file object should be available in a Java class where I will have my business logic.

Is this possible without using struts?

<s:form action="**direct call to Action method here**" method="post" enctype="multipart/form-data" >
<s:file name="userImage" label="User Image" /><s:submit />

Please help me with the ways of doing this.

thanks.

Answer 1

Value of action attribute should be URL. The given URL specifies an address to which the data from the form should be sent when a form is submitted.

Use following html code in your jsp page:

<form action="uploadFile" method="post"
                    enctype="multipart/form-data">
<input type="file" name="file" />
<input type="submit" value="Upload file" />

Define mapping of servlet that responsible for loading a file in your web.xml file:

 <servlet>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>package.UploadServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>UploadServlet</servlet-name>
    <url-pattern>/uploadFile</url-pattern>
</servlet-mapping>

And implement the method doPost in given servlet in which call the method from your business logic:

protected void doPost(HttpServletRequest request, HttpServletResponse response) {
    yourMethod();
}

You can specify any JSP page in attribute action if you are using in your application only JSP:

<form action="upload_file.jsp" method="post" enctype="multipart/form-data">

This page will process a upload-file request in this case.