java/simple_bv_servlet/SimpleBVServlet.java

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package simple_bv_servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.ValidatorContext;
import javax.validation.ValidatorFactory;

public class SimpleBVServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter out = resp.getWriter();
        resp.setContentType("text/html");
        out.print("<html><head><title>SimpleBVServlet</title></head><body>");

        ValidatorFactory validatorFactory = null;

        validatorFactory = Validation.buildDefaultValidatorFactory();

        out.print("<p>");
        out.print("Obtained ValidatorFactory: " + validatorFactory + ".");
        out.print("</p>");

        ValidatorContext validatorContext = validatorFactory.usingContext();
        javax.validation.Validator beanValidator = validatorContext.getValidator();

        out.print("<h1>");
        out.print("Validating person class using validateValue with valid property");
        out.print("</h1>");

        List<String> listOfString = new ArrayList<String>();
        listOfString.add("one");
        listOfString.add("two");
        listOfString.add("three");

        Set<ConstraintViolation<Person>> violations =
                beanValidator.validateValue(Person.class, "listOfString", listOfString);

        printConstraintViolations(out, violations, "case1");

        out.print("<h1>");
        out.print("Validating person class using validateValue with invalid property");
        out.print("</h1>");

        try {
            violations =
                    beanValidator.validateValue(Person.class, "nonExistentProperty", listOfString);
        } catch (IllegalArgumentException iae) {
            out.print("<p>");
            out.print("case2: caught IllegalArgumentException.  Message: " +
                    iae.getMessage());
            out.print("</p>");
        }
        Person person = new Person();

        out.print("<h1>");
        out.print("Validating invalid person instance using validate.");
        out.print("</h1>");

        violations = beanValidator.validate(person);

        printConstraintViolations(out, violations, "case3");

        out.print("<h1>");
        out.print("Validating valid person.");
        out.print("</h1>");

        person.setFirstName("John");
        person.setLastName("Yaya");
        person.setListOfString(listOfString);

        violations = beanValidator.validate(person);
        printConstraintViolations(out, violations, "case4");

        out.print("</body></html>");

    }

    private void printConstraintViolations(PrintWriter out,
            Set<ConstraintViolation<Person>> violations, String caseId) {
        if (violations.isEmpty()) {
            out.print("<p>");
            out.print(caseId + ": No ConstraintViolations found.");
            out.print("</p>");
        } else {
            for (ConstraintViolation<Person> curViolation : violations) {
                out.print("<p>");
                out.print(caseId + ": ConstraintViolation: message: " + curViolation.getMessage() +
                        " propertyPath: " + curViolation.getPropertyPath());
                out.print("</p>");
            }
        }

    }


}