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package site.sixteen.demoutils;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import java.io.*;
import java.util.Iterator;
public class {
public static void writeToExcel(Object[][] data, String fileName) throws IOException {
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("A班");
int rowNum = 0;
for (Object[] list : data) {
Row row = sheet.createRow(rowNum++);
int colNum = 0;
for (Object value : list) {
Cell cell = row.createCell(colNum++);
if (value instanceof String) {
cell.setCellValue((String) value);
} else if (value instanceof Integer) {
cell.setCellValue((Integer) value);
} else if (value instanceof Boolean) {
cell.setCellValue((boolean) value);
} else {
cell.setCellValue(String.valueOf(value));
}
}
}
try (FileOutputStream outputStream = new FileOutputStream(fileName)) {
workbook.write(outputStream);
}
}
public static void readExcel(File file) throws IOException {
FileInputStream excelFile = new FileInputStream(file);
Workbook workbook = new XSSFWorkbook(excelFile);
Sheet sheet = workbook.getSheetAt(0);
Iterator<Row> rowIterator = sheet.rowIterator();
while (rowIterator.hasNext()) {
Row row = rowIterator.next();
Iterator<Cell> cellIterator = row.cellIterator();
while (cellIterator.hasNext()) {
Cell cell = cellIterator.next();
if (cell.getCellTypeEnum() == CellType.STRING) {
System.out.print(cell.getStringCellValue() + "t");
} else if (cell.getCellTypeEnum() == CellType.NUMERIC) {
System.out.print(cell.getNumericCellValue() + "t");
} else if(cell.getCellTypeEnum() == CellType.BOOLEAN){
System.out.print(cell.getBooleanCellValue() + "t");
} else {
System.out.print(cell.getStringCellValue() + "t");
}
}
System.out.println();
}
}
public static void main(String[] args) {
Object[][] datas = {
{"编号", "名字", "年龄", "性别"},
{"001", "Tom", 18, true},
{"002", "Jac", 10, true},
{"003", "Oct", 24, true},
{"004", "Lil", 21, false},
};
String fileName = "/tmp/demo-write.xlsx";
try {
writeToExcel(datas, fileName);
} catch (IOException e) {
e.printStackTrace();
}
try {
readExcel(new File(fileName));
} catch (IOException e) {
e.printStackTrace();
}
}
}
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