Spring Boot generate XML File dengan Jackson

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Requirement: 
- java 1.8
- ide
- maven

Structure Project : 
├── HELP.md
├── mvnw
├── mvnw.cmd
├── pom.xml
├── spring-boot-generate-file-xml.iml
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com
│   │   │       └── fluex404
│   │   │           └── springbootgeneratefilexml
│   │   │               ├── controller
│   │   │               │   └── UserController.java
│   │   │               ├── model
│   │   │               │   ├── Address.java
│   │   │               │   ├── Root.java
│   │   │               │   └── User.java
│   │   │               └── SpringBootGenerateFileXmlApplication.java
│   │   └── resources
│   │       ├── application.properties
│   │       ├── static
│   │       └── templates
│   └── test
│       └── java
│           └── com
│               └── fluex404
│                   └── springbootgeneratefilexml
│                       └── SpringBootGenerateFileXmlApplicationTests.java
└── target
    ├── classes
    │   ├── application.properties
    │   └── com
    │       └── fluex404
    │           └── springbootgeneratefilexml
    │               ├── controller
    │               │   └── UserController.class
    │               ├── model
    │               │   ├── Address.class
    │               │   ├── Root.class
    │               │   └── User.class
    │               └── SpringBootGenerateFileXmlApplication.class
    ├── generated-sources
    │   └── annotations
    ├── generated-test-sources
    │   └── test-annotations
    └── test-classes
        └── com
            └── fluex404
                └── springbootgeneratefilexml
                    └── SpringBootGenerateFileXmlApplicationTests.class

How To

pom.xml
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.4.2</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.fluex404</groupId>
	<artifactId>spring-boot-generate-file-xml</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>spring-boot-generate-file-xml</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.dataformat</groupId>
			<artifactId>jackson-dataformat-xml</artifactId>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<version>1.18.16</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

buat beberapa model seperti Root.java, User.java dan Address.java

Address.java
package com.fluex404.springbootgeneratefilexml.model;

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
import lombok.Getter;
import lombok.Setter;

import javax.xml.bind.annotation.XmlRootElement;

@Getter
@Setter
@XmlRootElement
public class Address {
    @JacksonXmlProperty(localName = "PROVINCE")
    private String province;
    @JacksonXmlProperty(localName = "CITY")
    private String city;
}

User.java
package com.fluex404.springbootgeneratefilexml.model;

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
import lombok.Getter;
import lombok.Setter;

import javax.xml.bind.annotation.XmlRootElement;
import java.io.Serializable;

@Getter
@Setter
@XmlRootElement
public class User {

    @JacksonXmlProperty(localName = "ADDRESS")
    @JacksonXmlElementWrapper(useWrapping = false)
    private Address address;

    @JacksonXmlProperty(localName = "NAMA")
    private String nama;
    @JacksonXmlProperty(localName = "EMAIL")
    private String email;
    @JacksonXmlProperty(localName = "PHONE")
    private String phone;
}

Root.java
package com.fluex404.springbootgeneratefilexml.model;

import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlElementWrapper;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlProperty;
import com.fasterxml.jackson.dataformat.xml.annotation.JacksonXmlRootElement;
import lombok.Getter;
import lombok.Setter;

import javax.xml.bind.annotation.XmlRootElement;
import java.util.List;

@Getter
@Setter
@XmlRootElement
@JacksonXmlRootElement(localName = "root")
public class Root {
    // attributes
    @JacksonXmlProperty(isAttribute = true, localName = "xmlns")
    private String attr1 = "http://abcabc/abc/xyz/html";
    @JacksonXmlProperty(isAttribute = true, localName = "xmlns:vc")
    private String attr2 = "http://abcabc/abc/xyz/xhtml";

    @JacksonXmlProperty(localName = "VERSION")
    private String version;

    @JacksonXmlElementWrapper(localName = "USERS")
    @JacksonXmlProperty(localName="USER")
    private List<User> users;
}

lalu buat controller nya dan buat beberapa data fake user di method getUsers. 

UserController.java
package com.fluex404.springbootgeneratefilexml.controller;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator;
import com.fluex404.springbootgeneratefilexml.model.Address;
import com.fluex404.springbootgeneratefilexml.model.Root;
import com.fluex404.springbootgeneratefilexml.model.User;
import org.springframework.core.io.InputStreamResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

@RestController
@RequestMapping("/user")
public class UserController {

    private List<User> getUsers(){
        List<User> users = new ArrayList<>();

        Address address1 = new Address();
        address1.setCity("BOGOR");
        address1.setProvince("JAWA BARAT");

        Address address2 = new Address();
        address2.setCity("JAKARTA BARAT");
        address2.setProvince("JAWA BARAT");

        User user1 = new User();
        user1.setAddress(address1);
        user1.setEmail("abcabc@gmail.com");
        user1.setNama("Isa");
        user1.setPhone("123123");

        User user2 = new User();
        user2.setAddress(address2);
        user2.setEmail("xzyxzy26@gmail.com");
        user2.setNama("Rara");
        user2.setPhone("00221");

        User user3 = new User();
        user3.setAddress(address1);
        user3.setEmail("kkjj26@gmail.com");
        user3.setNama("Test");
        user3.setPhone("321321");

        users.add(user1);
        users.add(user2);
        users.add(user3);


        return users;
    }

    @GetMapping("/download/xml")
    public ResponseEntity download() throws JsonProcessingException {
        XmlMapper xmlMapper = new XmlMapper();
        xmlMapper.configure( ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true );


        Root root = new Root();
        List<User> users = getUsers();

        root.setVersion("1.10.20");
        root.setUsers(users);

        byte[] byteArr = xmlMapper.writeValueAsString(root).getBytes();

        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Disposition", "attachment; filename=abcabc.xml");

        return ResponseEntity.ok().headers(headers).body(new InputStreamResource(new ByteArrayInputStream(byteArr)));
    }
}

Testing: 
buka browser lalu masuk ke url ini http://localhost:8080/user/download/xml
download filenya dan isi filenya akan seperti ini






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