Jackson Java（開発者向けの仕組み）

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.2</version>
</dependency>

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'<dependency> <groupId> com.fasterxml.jackson.core</groupId> <artifactId> jackson-databind</artifactId> <version>2.13.2</version> </dependency>

import com.fasterxml.jackson.databind.ObjectMapper;
class Main {
    public static void main(String[] args) {
        ObjectMapper objectMapper = new ObjectMapper();
        // Java object to JSON
        try {
            User user = new User("John", "Doe", 30);
            String jsonString = objectMapper.writeValueAsString(user);
            System.out.println("JSON String: " + jsonString);
            // JSON to Java object
            String jsonInput = "{\"firstName\":\"Jane\",\"lastName\":\"Doe\",\"age\":25}";
            User userFromJson = objectMapper.readValue(jsonInput, User.class);
            System.out.println("User from JSON: " + userFromJson);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
class User {
    public String firstName;
    public String lastName;
    public int age;
    public User() {
    }
    public User(String firstname, String lastname, int i) {
        firstName = firstname;
        lastName = lastname;
        age = i;
    }
}

Private com As import
Friend Class Main
	Public Shared Sub main(ByVal args() As String)
		Dim objectMapper As New ObjectMapper()
		' Java object to JSON
		Try
			Dim user As New User("John", "Doe", 30)
			Dim jsonString As String = objectMapper.writeValueAsString(user)
			System.out.println("JSON String: " & jsonString)
			' JSON to Java object
			Dim jsonInput As String = "{""firstName"":""Jane"",""lastName"":""Doe"",""age"":25}"
			Dim userFromJson As User = objectMapper.readValue(jsonInput, User.class)
			System.out.println("User from JSON: " & userFromJson)
		Catch e As Exception
			e.printStackTrace()
		End Try
	End Sub
End Class
Friend Class User
	Public firstName As String
	Public lastName As String
	Public age As Integer
	Public Sub New()
	End Sub
	Public Sub New(ByVal firstname As String, ByVal lastname As String, ByVal i As Integer)
		Me.firstName = firstname
		Me.lastName = lastname
		age = i
	End Sub
End Class

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
class TreeModelExample {
    public static void main(String[] args) {
        ObjectMapper objectMapper = new ObjectMapper();
        try {
            String jsonString = "{\"name\":\"John\", \"age\":30}";
            // Parse JSON string into JsonNode
            JsonNode rootNode = objectMapper.readTree(jsonString);
            System.out.println("Name: " + rootNode.get("name").asText());
            System.out.println("Age: " + rootNode.get("age").asInt());
            // Modify the JSON
            ((ObjectNode) rootNode).put("age", 31);
            System.out.println("Modified JSON: " + rootNode.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Private com As import
Private com As import
Private com As import
Friend Class TreeModelExample
	Public Shared Sub main(ByVal args() As String)
		Dim objectMapper As New ObjectMapper()
		Try
			Dim jsonString As String = "{""name"":""John"", ""age"":30}"
			' Parse JSON string into JsonNode
			Dim rootNode As JsonNode = objectMapper.readTree(jsonString)
			System.out.println("Name: " & rootNode.get("name").asText())
			System.out.println("Age: " & rootNode.get("age").asInt())
			' Modify the JSON
			CType(rootNode, ObjectNode).put("age", 31)
			System.out.println("Modified JSON: " & rootNode.toString())
		Catch e As Exception
			e.printStackTrace()
		End Try
	End Sub
End Class

import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonToken;
import java.io.File;
class StreamingAPIExample {
    public static void main(String[] args) {
        JsonFactory factory = new JsonFactory();
        try (JsonParser parser = factory.createParser(new File("large.json"))) {
            while (!parser.isClosed()) {
                JsonToken token = parser.nextToken();
                if (token == JsonToken.FIELD_NAME) {
                    String fieldName = parser.getCurrentName();
                    System.out.println("Field: " + fieldName);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Private com As import
Private com As import
Private com As import
Private java As import
Friend Class StreamingAPIExample
	Public Shared Sub main(ByVal args() As String)
		Dim factory As New JsonFactory()
		Try
'INSTANT VB TODO TASK: Local functions are not converted by Instant VB:
'			(JsonParser parser = factory.createParser(New File("large.json")))
'		{
'			while (!parser.isClosed())
'			{
'				JsonToken token = parser.nextToken();
'				if (token == JsonToken.FIELD_NAME)
'				{
'					String fieldName = parser.getCurrentName();
'					System.out.println("Field: " + fieldName);
'				}
'			}
'		}
		Catch e As Exception
			e.printStackTrace()
		End Try
		End Try
	End Sub

<dependency>
    <groupId>com.ironsoftware</groupId>
    <artifactId>ironpdf</artifactId>
    <version>2023.6.0</version>
</dependency>

'INSTANT VB TODO TASK: The following line uses invalid syntax:
'<dependency> <groupId> com.ironsoftware</groupId> <artifactId> ironpdf</artifactId> <version>2023.6.0</version> </dependency>

import com.fasterxml.jackson.databind.ObjectMapper;
import com.ironsoftware.ironpdf.PdfDocument;
import com.ironsoftware.ironpdf.*;
import java.io.File;
import java.util.List;
class JacksonIronPDFExample {
    public static void main(String[] args) {
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            // Read JSON from a file
            List<Person> persons = objectMapper.readValue(new File("persons.json"),
                    objectMapper.getTypeFactory().constructCollectionType(List.class, Person.class));
            // Generate HTML content from the JSON data
            StringBuilder htmlContent = new StringBuilder("<h1>Persons List</h1><table border='1'><tr><th>First Name</th><th>Last Name</th><th>Birth Date</th></tr>");
            for (Person person : persons) {
                htmlContent.append("<tr>")
                        .append("<td>").append(person.getFirstName()).append("</td>")
                        .append("<td>").append(person.getLastName()).append("</td>")
                        .append("<td>").append(person.getBirthDate()).append("</td>")
                        .append("</tr>");
            }
            htmlContent.append("</table>");
            // Create PDF from the HTML content
            PdfDocument pdf = PdfDocument.renderHtmlAsPdf(htmlContent.toString());
            pdf.saveAs("persons.pdf");
            System.out.println("PDF created successfully from JSON data!");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
class Person {
    private String firstName;
    private String lastName;
    private String birthDate;
    // Constructors, getters, and setters omitted for brevity
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public String getBirthDate() {
        return birthDate;
    }
    public void setBirthDate(String birthDate) {
        this.birthDate = birthDate;
    }
}

Private com As import
Private com As import
Private com As import
Private java As import
Private java As import
Friend Class JacksonIronPDFExample
	Public Shared Sub main(ByVal args() As String)
		Try
			Dim objectMapper As New ObjectMapper()
			' Read JSON from a file
			Dim persons As List(Of Person) = objectMapper.readValue(New File("persons.json"), objectMapper.getTypeFactory().constructCollectionType(List.class, Person.class))
			' Generate HTML content from the JSON data
			Dim htmlContent As New StringBuilder("<h1>Persons List</h1><table border='1'><tr><th>First Name</th><th>Last Name</th><th>Birth Date</th></tr>")
			Do
				htmlContent.append("<tr>").append("<td>").append(person.getFirstName()).append("</td>").append("<td>").append(person.getLastName()).append("</td>").append("<td>").append(person.getBirthDate()).append("</td>").append("</tr>")
			Loop
			htmlContent.append("</table>")
			' Create PDF from the HTML content
			Dim pdf As PdfDocument = PdfDocument.renderHtmlAsPdf(htmlContent.toString())
			pdf.saveAs("persons.pdf")
			System.out.println("PDF created successfully from JSON data!")
		Catch e As Exception
			e.printStackTrace()
		End Try
	End Sub
End Class
Friend Class Person
	Private firstName As String
	Private lastName As String
	Private birthDate As String
	' Constructors, getters, and setters omitted for brevity
	Public Function getFirstName() As String
		Return firstName
	End Function
	Public Sub setFirstName(ByVal firstName As String)
		Me.firstName = firstName
	End Sub
	Public Function getLastName() As String
		Return lastName
	End Function
	Public Sub setLastName(ByVal lastName As String)
		Me.lastName = lastName
	End Sub
	Public Function getBirthDate() As String
		Return birthDate
	End Function
	Public Sub setBirthDate(ByVal birthDate As String)
		Me.birthDate = birthDate
	End Sub
End Class