validationservlet.java

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/***
 * Excerpted from "Pragmatic Ajax"
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/ajax for more book information.
***/
package ajaxian.book.crm.servlet;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletConfig;
import java.io.PrintWriter;
import java.io.IOException;

public class ValidationServlet extends HttpServlet {
    public void doGet(HttpServletRequest request,
		      HttpServletResponse response)
	throws IOException {

	response.setContentType("text/html");
	PrintWriter out = response.getWriter();
	System.out.println(request);
	String required = request.getParameter("required");
	String type = request.getParameter("type");
	String value = request.getParameter("value");
	String message = "";
	if(required.equals("required")) message += validateRequired(value);
	out.println(message);
    }
    
    private String validateRequired(String input) {
	if (null==input || 0==input.length()) return "Field required";
	return "";
    }
}