- MapStruct Tutorial
- MapStruct - Home
- MapStruct - Overview
- MapStruct - Environment Setup
- Mapping
- MapStruct - Basic Mapping
- MapStruct - Custom Mapping
- MapStruct - Mapping Multiple
- MapStruct - Mapping Nested Bean
- MapStruct - Mapping Direct Field
- MapStruct - Builder
- Data Type Conversions
- MapStruct - Implicit Type Conversion
- MapStruct - Using numberFormat
- MapStruct - Using dateFormat
- MapStruct - Using expression
- MapStruct - Using constant
- MapStruct - Using defaultValue
- MapStruct - Using defaultExpression
- Mapping Collections
- MapStruct - Mapping List
- MapStruct - Mapping Map
- Miscellaneous
- MapStruct - Mapping Streams
- MapStruct - Mapping Enum
- MapStruct - Throwing Exceptions
- MapStruct - Customizing Mapper
- MapStruct Useful Resources
- MapStruct - Quick Guide
- MapStruct - Useful Resources
- MapStruct - Discussion
MapStruct - Using numberFormat
MapStruct handles conversion of numbers to String in required format seamlessly. We can pass the required format as numberFormat during @Mapping annotation. For example, consider a case where an amount stored in numbers is to be shown in currency format.
Source − Entity has price as 350.
Target − Model to show price as $350.00.
numberFormat − Use format $#.00
Example
Open project mapping as updated in Mapping Implicit Type Conversions chapter in Eclipse.
Create CarEntity.java with following code −
CarEntity.java
package com.tutorialspoint.entity; public class CarEntity { private int id; private double price; public int getId() { return id; } public void setId(int id) { this.id = id; } public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } }
Create Car.java with following code −
Car.java
package com.tutorialspoint.model; public class Car { private int id; private String price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getPrice() { return price; } public void setPrice(String price) { this.price = price; } }
Create CarMapper.java with following code −
CarMapper.java
package com.tutorialspoint.mapper; import org.mapstruct.Mapper; import org.mapstruct.Mapping; import com.tutorialspoint.entity.CarEntity; import com.tutorialspoint.model.Car; @Mapper public interface CarMapper { @Mapping(source = "price", target = "price", numberFormat = "$#.00") Car getModelFromEntity(CarEntity carEntity); }
Create CarMapperTest.java with following code −
CarMapperTest.java
package com.tutorialspoint.mapping; import static org.junit.jupiter.api.Assertions.assertEquals; import org.junit.jupiter.api.Test; import org.mapstruct.factory.Mappers; import com.tutorialspoint.entity.CarEntity; import com.tutorialspoint.mapper.CarMapper; import com.tutorialspoint.model.Car; public class CarMapperTest { private CarMapper carMapper = Mappers.getMapper(CarMapper.class); @Test public void testEntityToModel() { CarEntity entity = new CarEntity(); entity.setPrice(345000); entity.setId(1); Car model = carMapper.getModelFromEntity(entity); assertEquals(model.getPrice(), "$345000.00"); assertEquals(entity.getId(), model.getId()); } }
Run the following command to test the mappings.
mvn clean test
Output
Once command is successful. Verify the output.
mvn clean test [INFO] Scanning for projects... ... [INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ mapping --- [INFO] Surefire report directory: \mvn\mapping\target\surefire-reports ------------------------------------------------------- T E S T S ------------------------------------------------------- Running com.tutorialspoint.mapping.CarMapperTest Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.035 sec Running com.tutorialspoint.mapping.DeliveryAddressMapperTest Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0 sec Running com.tutorialspoint.mapping.StudentMapperTest Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.001 sec Results : Tests run: 4, Failures: 0, Errors: 0, Skipped: 0 ...
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