Membuat export dan import Excel di spring boot

Membuat export dan import Excel di spring boot

          Adakalanya seorang developer diminta untuk membuat fitur export dan import berbentuk excel dan sebenarnya java sudah menyediakan suatu liblary yang memudahkan kita untuk bekerja dengan MS-Office yaitu Apache POI. Disini saya akan menggunakan Apache POI untuk membaca dan menulis Excel.

Catatan : Disini saya sarankan untuk belajar Apache POI Excel terlebih dahulu agar anda mengerti kode yang saya buat di bawah ini.

Bahan :
- IntelliJ IDEA
- PostgreSQL
- Maven
- Java 8

Jika sudah tersedia bahan - bahan di atas langsung saja kunjungi situs ini

Tambahkan dependency Apache POI di pom.xml seperti di bawah ini.

<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.fluex404</groupId>
	<artifactId>springboot_export_n_import</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>springboot_export_n_import</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-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>4.0.1</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>4.0.1</version>
		</dependency>

		<dependency>
			<groupId>org.postgresql</groupId>
			<artifactId>postgresql</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</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 databasenya disini saya membuat database yang bernama springboot_export_n_importdb lalu tambahkan perintah dibawah ini ke application.properties

## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url=jdbc:postgresql://localhost:5432/springboot_export_n_importdb
spring.datasource.username=postgres
spring.datasource.password=postgres

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto=update

Buat class model Siswa.java

package com.fluex404.springboot_export_n_import.model;

import lombok.AllArgsConstructor;
import lombok.Data;

import javax.persistence.*;
import java.io.Serializable;

@Data
@AllArgsConstructor
@Entity
@Table(name="siswa")
public class Siswa implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
    private String name;
    private String kelas;
    private String jurusan;

    public Siswa() {
    }
}

Buat interface dao SiswaDao.java

package com.fluex404.springboot_export_n_import.dao;

import com.fluex404.springboot_export_n_import.model.Siswa;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface SiswaDao extends JpaRepository<Siswa, Integer> {
}

Buat controller. Disini RestController dan Controller
Buat class controller HttpMappingController.java

package com.fluex404.springboot_export_n_import.controller;

import com.fluex404.springboot_export_n_import.dao.SiswaDao;
import com.fluex404.springboot_export_n_import.myapachepoi.ExcelGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class HttpMappingController {

    @Autowired
    private ExcelGenerator excel;

    @GetMapping("/import")
    public String creteGetImport() {

        return "import";
    }

    @PostMapping("/import")
    public String cretePostImport(@RequestParam(name = "file") MultipartFile file) throws Exception {


        excel.importExcel(file);

        return "redirect:/import";
    }

}

Buat Class HttpMappingRestController.java

package com.fluex404.springboot_export_n_import.controller;

import com.fluex404.springboot_export_n_import.dao.SiswaDao;
import com.fluex404.springboot_export_n_import.model.Siswa;
import com.fluex404.springboot_export_n_import.myapachepoi.ExcelGenerator;
import org.springframework.beans.factory.annotation.Autowired;
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.RestController;

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

@RestController
public class HttpMappingRestController {

    private SiswaDao siswaDao;
    private ExcelGenerator excel;

    @Autowired
    public HttpMappingRestController(SiswaDao siswaDao, ExcelGenerator excel) {
        this.siswaDao = siswaDao;
        this.excel = excel;
    }

    @GetMapping("/export")
    public ResponseEntity<InputStreamResource> excelSiswaReport() throws Exception {
        List<Siswa> siswas = siswaDao.findAll();

        ByteArrayInputStream in = excel.exportExcel(siswas);

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

        return ResponseEntity.ok().headers(headers).body(new InputStreamResource(in));

    }


}

Buat ExcelGenerator.java

package com.fluex404.springboot_export_n_import.myapachepoi;

import com.fluex404.springboot_export_n_import.dao.SiswaDao;
import com.fluex404.springboot_export_n_import.model.Siswa;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.ss.formula.udf.UDFFinder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.Iterator;
import java.util.List;

@Component
public class ExcelGenerator {

    @Autowired
    private SiswaDao siswaDao;

    /* export */
    public ByteArrayInputStream exportExcel(List<Siswa> siswas) throws Exception{
        String[] columns = {"Id", "Name", "Kelas", "Jurusan"};
        try(
                Workbook workbook = new XSSFWorkbook();
                ByteArrayOutputStream out = new ByteArrayOutputStream()
                )
        {
            CreationHelper creationHelper = workbook.getCreationHelper();
            Sheet sheet = workbook.createSheet("Data Siswa");
            Font headerFont = workbook.createFont();
            headerFont.setBold(true);
            headerFont.setColor(IndexedColors.BLUE.getIndex());
            CellStyle headerCellStyle = workbook.createCellStyle();
            headerCellStyle.setFont(headerFont);

            //Row ofor Header
            Row headerRow = sheet.createRow(0);

            //Header
            for(int i=0;i<columns.length;i++) {
                Cell cell = headerRow.createCell(i);
                cell.setCellValue(columns[i]);
                cell.setCellStyle(headerCellStyle);
            }


            int rowIdx = 1;
            for(Siswa siswa : siswas) {
                Row row = sheet.createRow(rowIdx);

                row.createCell(0).setCellValue(siswa.getId());
                row.createCell(1).setCellValue(siswa.getName());
                row.createCell(2).setCellValue(siswa.getKelas());
                row.createCell(3).setCellValue(siswa.getJurusan());
                rowIdx++;
            }

            workbook.write(out);
            workbook.close();
            return new ByteArrayInputStream(out.toByteArray());
        }catch(Exception e) {

        }
        return null;
    }

    /* Import */
    public void importExcel(MultipartFile file) throws Exception{

        Workbook workbook = new XSSFWorkbook(file.getInputStream());
        Sheet sheet = workbook.getSheetAt(0);

        for(int i=0;i<(CoutRowExcel(sheet.rowIterator()));i++) {
            if(i == 0) {
                continue;
            }

            Row row = sheet.getRow(i);

            String nama = row.getCell(1).getStringCellValue();
            String kelas = row.getCell(2).getStringCellValue();
            String jurusan = row.getCell(3).getStringCellValue();

            siswaDao.save(new Siswa(0, nama, kelas, jurusan));
        }

    }

    /* Cout Row of Excel Table */
    public static int CoutRowExcel(Iterator<Row> iterator) {
        int size = 0;
        while(iterator.hasNext()) {
            Row row = iterator.next();
            size++;
        }
        return size;
    }
}

Buat import.html

<html xmlns:th="http://www.thymeleaf.org" lang="en">
    <head>
        <title>Import File</title>
    </head>
    <body>

        <form th:action="@{/import}" method="post" enctype="multipart/form-data">
            <input type="file" name="file">
            <input type="submit" value="Import">
        </form>

    </body>
</html>

File Projectnya bisa si download disini https://github.com/fluex404/springboot_export_n_import_apachepoi

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