#37 java: poi api ex

java/api/build.gradle

@@ -12,6 +12,10 @@ repositories {
 dependencies {
     implementation 'org.jsoup:jsoup:1.16.1'
     implementation 'com.google.code.gson:gson:2.10.1'
+    implementation 'org.apache.poi:poi:5.2.3'
+    implementation 'org.apache.poi:poi-ooxml:5.2.3'
+
+    implementation 'org.apache.logging.log4j:log4j-core:2.20.0'
 
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'

java/api/src/main/java/poi/ExcelEx.java

@@ -0,0 +1,63 @@
+package poi;
+
+import org.apache.poi.ss.usermodel.*;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class ExcelEx {
+
+    public static void main(String[] args) {
+        try {
+            FileInputStream file = new FileInputStream("example.xlsx");
+            Workbook workbook = WorkbookFactory.create(file);
+            Sheet sheet = workbook.getSheetAt(0);
+
+            for (Row row : sheet) {
+                for (Cell cell : row) {
+
+                    switch (cell.getCellType()) {
+                        case NUMERIC:
+                            if (DateUtil.isCellDateFormatted(cell)) {
+                                Date date = cell.getDateCellValue();
+                                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
+                                String dateValue = format.format(date);
+                                System.out.print(dateValue + "\t");
+                            } else {
+                                double numericValue = cell.getNumericCellValue();
+                                if (numericValue == Math.floor(numericValue)) {
+                                    int intValue = (int) numericValue;
+                                    System.out.print(intValue + "\t");
+                                } else {
+                                    System.out.print(numericValue + "\t");
+                                }
+                            }
+                            break;
+                        case STRING:
+                            String stringValue = cell.getStringCellValue();
+                            System.out.print(stringValue + "\t");
+                            break;
+                        case BOOLEAN:
+                            boolean booleanValue = cell.getBooleanCellValue();
+                            System.out.print(booleanValue + "\t");
+                            break;
+                        case FORMULA:
+                            String formulaValue = cell.getCellFormula();
+                            System.out.print(formulaValue + "\t");
+                        case BLANK:
+                        default:
+                            System.out.print("\t");
+                            break;
+                    }
+                }
+                System.out.println();
+            }
+            file.close();
+            System.out.println("엑셀 데이터 읽어오기 완료");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}