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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("SimpleBVServlet");
ValidatorFactory validatorFactory = null;
validatorFactory = Validation.buildDefaultValidatorFactory();
out.print("");
out.print("Obtained ValidatorFactory: " + validatorFactory + ".");
out.print("
");
ValidatorContext validatorContext = validatorFactory.usingContext();
javax.validation.Validator beanValidator = validatorContext.getValidator();
out.print("");
out.print("Validating person class using validateValue with valid property");
out.print("
");
List listOfString = new ArrayList();
listOfString.add("one");
listOfString.add("two");
listOfString.add("three");
Set> violations =
beanValidator.validateValue(Person.class, "listOfString", listOfString);
printConstraintViolations(out, violations, "case1");
out.print("");
out.print("Validating person class using validateValue with invalid property");
out.print("
");
try {
violations =
beanValidator.validateValue(Person.class, "nonExistentProperty", listOfString);
} catch (IllegalArgumentException iae) {
out.print("");
out.print("case2: caught IllegalArgumentException. Message: " +
iae.getMessage());
out.print("
");
}
Person person = new Person();
out.print("");
out.print("Validating invalid person instance using validate.");
out.print("
");
violations = beanValidator.validate(person);
printConstraintViolations(out, violations, "case3");
out.print("");
out.print("Validating valid person.");
out.print("
");
person.setFirstName("John");
person.setLastName("Yaya");
person.setListOfString(listOfString);
violations = beanValidator.validate(person);
printConstraintViolations(out, violations, "case4");
out.print("");
}
private void printConstraintViolations(PrintWriter out,
Set> violations, String caseId) {
if (violations.isEmpty()) {
out.print("");
out.print(caseId + ": No ConstraintViolations found.");
out.print("
");
} else {
for (ConstraintViolation curViolation : violations) {
out.print("");
out.print(caseId + ": ConstraintViolation: message: " + curViolation.getMessage() +
" propertyPath: " + curViolation.getPropertyPath());
out.print("
");
}
}
}
}