在Spring Batch应用中实现带注释的Java Bean验证

<dependency>
    <groupId>javax.validation</groupId>
    <artifactId>validation-api</artifactId>
    <version>2.0.1.Final</version>
</dependency>

public class User {
    @NotBlank(message = "Username cannot be blank")
    private String username;

    // Getters and setters
}

public class UserValidator implements Validator {
    @Override
    public boolean supports(Class<?> clazz) {
        return User.class.equals(clazz);
    }

    @Override
    public void validate(Object target, Errors errors) {
        ValidationUtils.invokeValidator(new LocalValidatorFactoryBean(), target, errors);
    }
}

<batch:job id="userValidationJob">
    <batch:step id="userValidationStep">
        <batch:tasklet>
            <batch:validator ref="userValidator" />
            <batch:chunk reader="itemReader" writer="itemWriter" commit-interval="10" />
        </batch:tasklet>
    </batch:step>
</batch:job>

<bean id="userValidator" class="com.example.UserValidator" />