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JarjanazyJarjanazy
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Code for Jackson post (thombergs#197)
* add the initial maven project * add a few code examples * add a few code examples * add a few code examples * add a few code examples * add a few code examples * add JsonAnyGetter example
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‎core-java/jackson/jackson/.gitignore‎

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HELP.md
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target/*
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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.classpath
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.factorypath
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.project
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.settings
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.springBeans
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### IntelliJ IDEA ###
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.idea
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*.iws
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*.iml
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*.ipr
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/

‎core-java/jackson/jackson/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.reflectoring</groupId>
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<artifactId>jackson</artifactId>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.13.3</version>
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</dependency>
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<dependency>
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<groupId>com.fasterxml.jackson.datatype</groupId>
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<artifactId>jackson-datatype-jsr310</artifactId>
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<version>2.13.3</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-api</artifactId>
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<version>5.9.0-M1</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<version>1.18.24</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>3.23.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>

‎core-java/jackson/jackson/src/main/java/com/reflectoring/pojo/Car.java‎

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package com.reflectoring.pojo;
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import com.fasterxml.jackson.annotation.JsonAnySetter;
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import com.fasterxml.jackson.annotation.JsonSetter;
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import lombok.AllArgsConstructor;
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import lombok.Getter;
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import lombok.NoArgsConstructor;
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import java.util.HashMap;
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import java.util.Map;
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@NoArgsConstructor
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@AllArgsConstructor
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@Getter
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public class Car {
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@JsonSetter("carBrand")
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private String brand;
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private Map<String, String> unrecognizedFields = new HashMap<>();
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@JsonAnySetter
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public void allSetter(String fieldName, String fieldValue) {
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unrecognizedFields.put(fieldName, fieldValue);
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}
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}

‎core-java/jackson/jackson/src/main/java/com/reflectoring/pojo/Cat.java‎

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package com.reflectoring.pojo;
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import com.fasterxml.jackson.annotation.JsonAnyGetter;
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import com.fasterxml.jackson.annotation.JsonGetter;
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import lombok.AllArgsConstructor;
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import lombok.NoArgsConstructor;
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import java.util.Map;
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@NoArgsConstructor
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@AllArgsConstructor
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public class Cat {
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private String name;
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@JsonAnyGetter
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Map<String, String> map = Map.of(
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"name", "Jack",
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"surname", "wolfskin"
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);
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@JsonGetter("catName")
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public String getName() {
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return name;
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}
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public Cat(String name) {
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this.name = name;
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}
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}

‎core-java/jackson/jackson/src/main/java/com/reflectoring/pojo/Dog.java‎

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package com.reflectoring.pojo;
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import com.fasterxml.jackson.annotation.JsonIgnore;
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import lombok.AllArgsConstructor;
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import lombok.Getter;
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import lombok.NoArgsConstructor;
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@AllArgsConstructor
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@NoArgsConstructor
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@Getter
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public class Dog {
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private String name;
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@JsonIgnore
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private Integer age;
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}

‎core-java/jackson/jackson/src/main/java/com/reflectoring/pojo/Employee.java‎

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package com.reflectoring.pojo;
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import lombok.AllArgsConstructor;
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import lombok.Getter;
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import lombok.NoArgsConstructor;
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import java.util.Date;
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@Getter
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@AllArgsConstructor
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@NoArgsConstructor
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public class Employee {
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private String firstName;
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private String lastName;
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private int age;
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}

‎core-java/jackson/jackson/src/main/java/com/reflectoring/pojo/Order.java‎

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package com.reflectoring.pojo;
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import com.fasterxml.jackson.annotation.JsonFormat;
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import com.fasterxml.jackson.annotation.JsonSetter;
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import lombok.AllArgsConstructor;
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import lombok.Getter;
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import lombok.NoArgsConstructor;
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import java.time.LocalDate;
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@NoArgsConstructor
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@AllArgsConstructor
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@Getter
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public class Order {
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private int id;
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@JsonFormat(pattern = "dd/MM/yyyy")
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private LocalDate date;
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}

‎core-java/jackson/jackson/src/test/java/com/reflectoring/JacksonTest.java‎

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package com.reflectoring;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.reflectoring.pojo.*;
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import org.junit.jupiter.api.Test;
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import java.io.File;
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import java.io.IOException;
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import java.time.LocalDate;
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import java.util.List;
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import java.util.Map;
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import static org.assertj.core.api.Assertions.assertThat;
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public class JacksonTest {
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ObjectMapper objectMapper = new ObjectMapper().findAndRegisterModules();
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@Test
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void jsonStringToPojo() throws JsonProcessingException {
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String employeeJson = "{\n" +
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" \"firstName\" : \"Jalil\",\n" +
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" \"lastName\" : \"Jarjanazy\",\n" +
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" \"age\" : 30\n" +
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"}";
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Employee employee = objectMapper.readValue(employeeJson, Employee.class);
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assertThat(employee.getFirstName()).isEqualTo("Jalil");
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}
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@Test
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void pojoToJsonString() throws JsonProcessingException {
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Employee employee = new Employee("Mark", "James", 20);
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String json = objectMapper.writeValueAsString(employee);
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assertThat(json).isEqualTo("{\"firstName\":\"Mark\",\"lastName\":\"James\",\"age\":20}");
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}
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@Test
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void jsonFileToPojo() throws IOException {
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File file = new File("src/test/resources/employee.json");
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Employee employee = objectMapper.readValue(file, Employee.class);
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assertThat(employee.getAge()).isEqualTo(44);
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assertThat(employee.getLastName()).isEqualTo("Simpson");
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assertThat(employee.getFirstName()).isEqualTo("Homer");
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}
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@Test
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void byteArrayToPojo() throws IOException {
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String employeeJson = "{\n" +
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" \"firstName\" : \"Jalil\",\n" +
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" \"lastName\" : \"Jarjanazy\",\n" +
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" \"age\" : 30\n" +
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"}";
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Employee employee = objectMapper.readValue(employeeJson.getBytes(), Employee.class);
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assertThat(employee.getFirstName()).isEqualTo("Jalil");
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}
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@Test
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void fileToListOfPojos() throws IOException {
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File file = new File("src/test/resources/employeeList.json");
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List<Employee> employeeList = objectMapper.readValue(file, new TypeReference<>(){});
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assertThat(employeeList).hasSize(2);
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assertThat(employeeList.get(0).getAge()).isEqualTo(33);
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assertThat(employeeList.get(0).getLastName()).isEqualTo("Simpson");
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assertThat(employeeList.get(0).getFirstName()).isEqualTo("Marge");
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}
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@Test
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void fileToMap() throws IOException {
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File file = new File("src/test/resources/employee.json");
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Map<String, Object> employee = objectMapper.readValue(file, new TypeReference<>(){});
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assertThat(employee.keySet()).containsExactly("firstName", "lastName", "age");
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assertThat(employee.get("firstName")).isEqualTo("Homer");
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assertThat(employee.get("lastName")).isEqualTo("Simpson");
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assertThat(employee.get("age")).isEqualTo(44);
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}
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@Test
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void fileToPojoWithUnknownProperties() throws IOException {
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File file = new File("src/test/resources/employeeWithUnknownProperties.json");
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objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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Employee employee = objectMapper.readValue(file, Employee.class);
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assertThat(employee.getFirstName()).isEqualTo("Homer");
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assertThat(employee.getLastName()).isEqualTo("Simpson");
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assertThat(employee.getAge()).isEqualTo(44);
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}
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@Test
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void orderToJson() throws JsonProcessingException {
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Order order = new Order(1, LocalDate.of(1900,2,1));
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String json = objectMapper.writeValueAsString(order);
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System.out.println(json);
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}
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@Test
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void orderToJsonWithDate() throws JsonProcessingException {
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Order order = new Order(1, LocalDate.of(2023, 1, 1));
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String json = objectMapper.writeValueAsString(order);
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System.out.println(json);
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}
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@Test
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void fileToOrder() throws IOException {
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File file = new File("src/test/resources/order.json");
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Order order = objectMapper.readValue(file, Order.class);
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assertThat(order.getDate().getYear()).isEqualTo(2000);
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assertThat(order.getDate().getMonthValue()).isEqualTo(4);
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assertThat(order.getDate().getDayOfMonth()).isEqualTo(30);
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}
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@Test
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void fileToCar() throws IOException {
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File file = new File("src/test/resources/car.json");
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Car car = objectMapper.readValue(file, Car.class);
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assertThat(car.getBrand()).isEqualTo("BMW");
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}
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@Test
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void fileToUnrecognizedCar() throws IOException {
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File file = new File("src/test/resources/carUnrecognized.json");
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Car car = objectMapper.readValue(file, Car.class);
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assertThat(car.getUnrecognizedFields()).containsKey("productionYear");
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}
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@Test
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void catToJson() throws JsonProcessingException {
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Cat cat = new Cat("Monica");
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String json = objectMapper.writeValueAsString(cat);
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System.out.println(json);
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}
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@Test
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void catToJsonWithMap() throws JsonProcessingException {
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Cat cat = new Cat("Monica");
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String json = objectMapper.writeValueAsString(cat);
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System.out.println(json);
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}
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@Test
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void dogToJson() throws JsonProcessingException {
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Dog dog = new Dog("Max", 3);
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String json = objectMapper.writeValueAsString(dog);
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System.out.println(json);
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}
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@Test
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void fileToDog() throws IOException {
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File file = new File("src/test/resources/dog.json");
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Dog dog = objectMapper.readValue(file, Dog.class);
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assertThat(dog.getName()).isEqualTo("bobby");
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assertThat(dog.getAge()).isNull();
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}
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}

‎core-java/jackson/jackson/src/test/resources/car.json‎

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{
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"carBrand" : "BMW"
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}

‎core-java/jackson/jackson/src/test/resources/carUnrecognized.json‎

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{
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"carBrand" : "BMW",
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"productionYear": 1996
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}

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