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Membuat export dan import Excel di spring boot

Membuat export dan import Excel di spring boot
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          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

Jika Ada pertanyaan bisa di tanyakan di www.facebook.com/fluex404
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