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BAEL-6504: Convert Json Array to Java list (#14049)

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BHARATH GANESH 2023-08-06 18:10:47 +05:30 committed by GitHub
parent b9dd050af8
commit ad939d477d
9 changed files with 210 additions and 0 deletions
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5
json-modules/json-conversion/README.md Normal file
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## JSON-CONVERSIONS
This module contains articles about JSON Conversions
### Relevant Articles:

39
json-modules/json-conversion/pom.xml Normal file
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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>org.baeldung</groupId>
<artifactId>json-conversion</artifactId>
<name>json-conversion</name>
<parent>
<artifactId>json-modules</artifactId>
<groupId>com.baeldung</groupId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>${json.version}</version>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>${gson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson.version}</version>
</dependency>
</dependencies>
<properties>
<json.version>20211205</json.version>
<gson.version>2.10.1</gson.version>
</properties>
</project>

31
json-modules/json-conversion/src/main/java/com/baeldung/jsonarraytolist/ConvertJsonArrayToList.java Normal file
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package com.baeldung.jsonarraytolist;
import java.lang.reflect.Type;
import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import entities.Product;
public class ConvertJsonArrayToList {
public List<Product> convertJsonArrayUsingGsonLibrary(String jsonArray) {
Gson gson = new Gson();
Type listType = new TypeToken<List<Product>>() {}.getType();
List<Product> gsonList = gson.fromJson(jsonArray, listType);
return gsonList;
}
public List<Product> convertJsonArrayUsingJacksonLibrary(String jsonArray) throws JsonProcessingException {
ObjectMapper objectMapper = new ObjectMapper();
List<Product> typeReferenceList = objectMapper.readValue(jsonArray, new TypeReference<List<Product>>() {});
return typeReferenceList;
}
}

29
json-modules/json-conversion/src/main/java/entities/Product.java Normal file
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package entities;
public class Product {
private int id;
private String name;
private String description;
public Product() {}
public Product(int id, String name, String description) {
this.id = id;
this.name = name;
this.description = description;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getDescription() {
return description;
}
}

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json-modules/json-conversion/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

60
json-modules/json-conversion/src/test/java/com/baeldung/jsonarraytolist/ConvertJsonArrayToListUnitTest.java Normal file
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package com.baeldung.jsonarraytolist;
import java.util.ArrayList;
import java.util.List;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import entities.Product;
public class ConvertJsonArrayToListUnitTest {
private static ObjectMapper objectMapper;
private static List<Product> productList;
private ConvertJsonArrayToList obj;
@Before
public void setup() {
obj = new ConvertJsonArrayToList();
productList = getProducts();
objectMapper = new ObjectMapper();
}
private List<Product> getProducts() {
List<Product> productList = new ArrayList<>();
Product prod1 = new Product(1, "Icecream", "Sweet and cold");
Product prod2 = new Product(2, "Apple", "Red and sweet");
Product prod3 = new Product(3, "Carrot", "Good for eyes");
productList.add(prod1);
productList.add(prod2);
productList.add(prod3);
return productList;
}
@Test
public void whenUsingGsonLibrary_thenCompareTwoProducts() {
Gson gson = new Gson();
String jsonArray = gson.toJson(productList);
List<Product> arrList = obj.convertJsonArrayUsingGsonLibrary(jsonArray);
Assert.assertEquals(productList.get(0).getId(), arrList.get(0).getId());
Assert.assertEquals(productList.get(1).getDescription(), arrList.get(1).getDescription());
Assert.assertEquals(productList.get(2).getName(), arrList.get(2).getName());
}
@Test
public void whenUsingJacksonLibrary_thenCompareTwoProducts() throws JsonProcessingException {
String jsonArray = objectMapper.writeValueAsString(productList);
List<Product> arrList = obj.convertJsonArrayUsingJacksonLibrary(jsonArray);
Assert.assertEquals(productList.get(0).getId(), arrList.get(0).getId());
Assert.assertEquals(productList.get(1).getDescription(), arrList.get(1).getDescription());
Assert.assertEquals(productList.get(2).getName(), arrList.get(2).getName());
}
}

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json-modules/json-conversion/src/test/resources/.gitignore vendored Normal file
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear

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json-modules/json-conversion/src/test/resources/logback-test.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework" level="WARN"/>
<logger name="org.springframework.transaction" level="WARN"/>
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN"/>
<root level="INFO">
<appender-ref ref="STDOUT"/>
</root>
</configuration>

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json-modules/pom.xml
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<modules>
<module>json</module>
<module>json-2</module>
<module>json-conversion</module>
<module>json-path</module>
<module>gson</module>
<module>gson-2</module>