Here I come with a project on “Spring MVC Custom validation”. Let’s see what we got here:
Md Mamun Abdul Kayum
Spring MVC, Bootstrap 3.x
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
Tomcat 8, Glassfish 4
Maven
For achieving spring mvc custom validation:
- 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"/>
<font color="red"><form:errors path="name"></form:errors></font>
</div>
</div>
- 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
- 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:
CustomValidator userValidator = new CustomValidator(); userValidator.validate(customerObject, result); if (result.hasErrors()) { return "addCustomer"; }
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