Fix: nullPointException 오류 해결

src/main/java/site/dpbr/dsjs/domain/character/usecase/ExportCharacterListToExcel.java

@@ -1,61 +1,69 @@
 package site.dpbr.dsjs.domain.character.usecase;
 
-import lombok.RequiredArgsConstructor;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.List;
+
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.Row;
 import org.apache.poi.ss.usermodel.Sheet;
 import org.apache.poi.ss.usermodel.Workbook;
 import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 import org.springframework.stereotype.Service;
+
+import lombok.RequiredArgsConstructor;
 import site.dpbr.dsjs.domain.character.domain.Character;
 import site.dpbr.dsjs.domain.character.domain.repository.CharacterRepository;
 
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.util.List;
-
 @Service
 @RequiredArgsConstructor
 public class ExportCharacterListToExcel {
 
-    private final CharacterRepository characterRepository;
-
-    public byte[] execute() throws IOException {
-        List<Character> characters = characterRepository.findAll();
-
-        // Excel Workbook 생성
-        Workbook workbook = new XSSFWorkbook();
-        Sheet sheet = workbook.createSheet("단생조사");
-
-        // 헤더 행 생성
-        Row headerRow = sheet.createRow(0);
-        String[] columns = {"닉네임", "성별", "월드", "직업", "레벨", "유니온", "유니온 아티펙트", "무릉", "전투력"};
-        for (int i = 0; i < columns.length; i++) {
-            Cell cell = headerRow.createCell(i);
-            cell.setCellValue(columns[i]);
-        }
-
-        // 데이터 행 생성
-        int rowNum = 1;
-        for (Character character : characters) {
-            Row row = sheet.createRow(rowNum++);
-            row.createCell(0).setCellValue(character.getName());
-            row.createCell(1).setCellValue(character.getGender());
-            row.createCell(2).setCellValue(character.getWorld());
-            row.createCell(3).setCellValue(character.getJob());
-            row.createCell(4).setCellValue(character.getLevel());
-            row.createCell(5).setCellValue(character.getUnionLevel());
-            row.createCell(6).setCellValue(character.getUnionArtifactLevel());
-            row.createCell(7).setCellValue(character.getMuLungFloor());
-            row.createCell(8).setCellValue(character.getCombatPower());
-        }
-
-        // Excel 파일을 ByteArrayOutputStream에 쓰기
-        ByteArrayOutputStream out = new ByteArrayOutputStream();
-        workbook.write(out);
-        workbook.close();
-
-        // 파일 데이터를 byte[]로 변환하여 반환
-        return out.toByteArray();
-    }
-}
+	private final CharacterRepository characterRepository;
+
+	public byte[] execute() throws IOException {
+		List<Character> characters = characterRepository.findAll();
+
+		// Excel Workbook 생성
+		Workbook workbook = new XSSFWorkbook();
+		Sheet sheet = workbook.createSheet("단생조사");
+
+		// 헤더 행 생성
+		Row headerRow = sheet.createRow(0);
+		String[] columns = {"닉네임", "성별", "월드", "직업", "레벨", "유니온", "유니온 아티펙트", "무릉", "전투력"};
+		for (int i = 0; i < columns.length; i++) {
+			Cell cell = headerRow.createCell(i);
+			cell.setCellValue(columns[i]);
+		}
+
+		// 데이터 행 생성
+		int rowNum = 1;
+		for (Character character : characters) {
+			Row row = sheet.createRow(rowNum++);
+
+			row.createCell(0).setCellValue(character.getName() != null ? character.getName() : "");
+			row.createCell(1).setCellValue(character.getGender() != null ? character.getGender() : "");
+			row.createCell(2).setCellValue(character.getWorld() != null ? character.getWorld() : "");
+			row.createCell(3).setCellValue(character.getJob() != null ? character.getJob() : "");
+			row.createCell(4).setCellValue(character.getLevel() != null ? String.valueOf(character.getLevel()) : "");
+			row.createCell(5)
+				.setCellValue(character.getUnionLevel() != null ? String.valueOf(character.getUnionLevel()) : "");
+			row.createCell(6)
+				.setCellValue(
+					character.getUnionArtifactLevel() != null ? String.valueOf(character.getUnionArtifactLevel()) : "");
+			row.createCell(7)
+				.setCellValue(
+					character.getMuLungFloor() != null ? String.valueOf(character.getUnionArtifactLevel()) : "");
+			row.createCell(8)
+				.setCellValue(character.getCombatPower() != null ? String.valueOf(character.getCombatPower()) : "");
+		}
+
+		// Excel 파일을 ByteArrayOutputStream에 쓰기
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		workbook.write(out);
+		workbook.close();
+
+		// 파일 데이터를 byte[]로 변환하여 반환
+		return out.toByteArray();
+	}
+}