Spring-Custom-Validation

Here I come with a project on “Spring MVC Custom validation”. Let’s see what we got here:

Author :

Md Mamun Abdul Kayum

Technologies :

   Spring MVC, Bootstrap 3.x

Required dependency for custom validation purpose:

   <dependency>
        <groupId>javax</groupId>
        <artifactId>javaee-web-api</artifactId>
        <version>7.0</version>
        <scope>provided</scope>
    </dependency>

Tested on Application Servers :

Tomcat 8, Glassfish 4

Build Tool:

Maven

Description:

For achieving spring mvc custom validation:

1. you have to add “form:errors” tad at the form input field like:

               <div class="form-group">
                   <label class="control-label col-sm-2" for="name">Customer Name:</label>
                   <div class="col-sm-10">
                       <form:input path="name" value="" type="text" class="form-control" placeholder="Customer Name"></form:input>
                   <font color="red"><form:errors path="name"></form:errors></font>
                   </div>
               </div>

   Add this error tag to those fields you want to validate.

2. You must a propertise file(Say message.properties) which will contains your validation messages. In our case it is “messages.properties” file located at webapp/WEB-INF/i18n/messages.properties
   It contains our messages:

   ```

   validation message for product

   NotEmpty.productName=enter a name
   NotEmpty.quality=enter a quality
   NotEmpty.measureUnit=enter a measure unit
   NotEmpty.quantity=enter a quantity

   validation message for customer

   NotEmpty.name=enter a name
   NotEmpty.education=enter your education
   NotEmpty.address=enter your address
   NotEmpty.designation=enter a designation

Range.quantity=quantity range should be between 1 - 100
Range.age=age should be greater than 5

3. Now you have to add a validator class for our form validation, it contains validation logics:

if (target instanceof CustomerForm) {
CustomerForm customerForm = (CustomerForm) target;
if (!StringUtils.hasText(customerForm.getName())) {
errors.rejectValue(“name”, “NotEmpty.name”);
}
if (!StringUtils.hasText(customerForm.getEducation())) {
errors.rejectValue(“education”, “NotEmpty.education”);
}
if (!StringUtils.hasText(customerForm.getAddress())) {
errors.rejectValue(“address”, “NotEmpty.address”);
}
if (!StringUtils.hasText(customerForm.getDesignation())) {
errors.rejectValue(“designation”, “NotEmpty.designation”);
}
if (customerForm.getAge() < 5) {
errors.rejectValue(“age”, “Range.age”);
}
}

From here we are sending errors if a filed failed to a validation logic.
4.  Now from Controller class you have to check if a filed have any validation error:<br>

CustomValidator userValidator = new CustomValidator();
userValidator.validate(customerObject, result);
if (result.hasErrors()) { 
return "addCustomer"; 
}
```
<br>

What we will get here: