Java Validation API

Author: giaunv

java-examples/java-bean-validation/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.hellokoding</groupId>
+    <artifactId>java.bean-validation</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.hibernate</groupId>
+            <artifactId>hibernate-validator</artifactId>
+            <version>6.0.16.Final</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.glassfish</groupId>
+            <artifactId>javax.el</artifactId>
+            <version>3.0.1-b09</version>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.4</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+</project>

java-examples/java-bean-validation/src/main/java/com/hellokoding/java/Main.java

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+package com.hellokoding.java;
+
+import javax.validation.ConstraintViolation;
+import javax.validation.Validation;
+import javax.validation.Validator;
+import java.math.BigDecimal;
+import java.util.Set;
+
+public class Main {
+    public static void main(String[] args) {
+        Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
+        Set<ConstraintViolation<Product>> constraintViolations = validator.validate(new Product(null, "Hello Koding", "Practical Coding Courses, Tutorials and Examples", BigDecimal.ZERO));
+
+        for(ConstraintViolation constraintViolation : constraintViolations) {
+            System.out.println(constraintViolation.getPropertyPath().toString().toUpperCase() + " " + constraintViolation.getMessage());
+        }
+    }
+}

java-examples/java-bean-validation/src/main/java/com/hellokoding/java/Product.java

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+package com.hellokoding.java;
+
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotNull;
+import javax.validation.constraints.Size;
+import java.math.BigDecimal;
+
+public class Product {
+    @NotNull
+    private Long id;
+
+    @NotNull
+    @ProductCodeExisting
+    private String code;
+
+    @Size(min=1, max = 10, message = "{Size.name}")
+    private String name;
+
+    @Min(1)
+    private BigDecimal price;
+
+    public Product(Long id, String code, String name, BigDecimal price) {
+        this.id = id;
+        this.code = code;
+        this.name = name;
+        this.price = price;
+    }
+}

java-examples/java-bean-validation/src/main/java/com/hellokoding/java/ProductCodeExisting.java

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+package com.hellokoding.java;
+
+import javax.validation.Constraint;
+import javax.validation.Payload;
+import java.lang.annotation.*;
+
+@Documented
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.PARAMETER})
+@Constraint(validatedBy = ProductCodeExistingValidator.class)
+public @interface ProductCodeExisting {
+    String message() default "{ProductCodeExisting}";
+
+    Class<?>[] groups() default { };
+
+    Class<? extends Payload>[] payload() default { };
+}

java-examples/java-bean-validation/src/main/java/com/hellokoding/java/ProductCodeExistingValidator.java

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+package com.hellokoding.java;
+
+import javax.validation.ConstraintValidator;
+import javax.validation.ConstraintValidatorContext;
+
+public class ProductCodeExistingValidator implements ConstraintValidator<ProductCodeExisting, String> {
+    @Override
+    public boolean isValid(String productCode, ConstraintValidatorContext context) {
+        return productCode.equals("P1") || productCode.equals("P2");
+    }
+}

java-examples/java-bean-validation/src/main/resources/ValidationMessages.properties

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+javax.validation.constraints.NotNull.message=is required
+Size.name=must be between {min} and {max} character long
+ProductCodeExisting="${validatedValue}" is not existing