JAVA-POI操作Excel读写

pom.xml

<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>4.1.0</version>
</dependency>

读

File xlsFile = new File("C:\\Users\\gaohuan\\Desktop\\1.xlsx");
// 获得工作簿对象
// 获得工作簿
Workbook workbook = WorkbookFactory.create(xlsFile);
// 获得工作表个数
int sheetCount = workbook.getNumberOfSheets();
// 遍历工作表
for (int i = 0; i < sheetCount; i++) {
    Sheet sheet = workbook.getSheetAt(i);
    // 获得行数
    int rows = sheet.getLastRowNum() + 1;
    // 获得列数，先获得一行，在得到改行列数
    Row tmp = sheet.getRow(0);
    if (tmp == null) {
        continue;
    }
    int cols = tmp.getPhysicalNumberOfCells();
    // 读取数据
    for (int row = 0; row < rows; row++) {
        Row r = sheet.getRow(row);
        for (int col = 0; col < cols; col++) {
            System.out.printf("%10s", r.getCell(col).getStringCellValue());
        }
        System.out.println();
    }
}

写

// 创建工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
// 创建工作表
HSSFSheet sheet = workbook.createSheet("sheet10");

for (int row = 0; row < 10; row++) {
    HSSFRow rows = sheet.createRow(row);
    for (int col = 0; col < 10; col++) {
        // 向工作表中添加数据
        rows.createCell(col).setCellValue("data" + row + col);
    }
}

File xlsFile = new File("C:\\Users\\gaohuan\\Desktop\\2.xls");
FileOutputStream xlsStream = new FileOutputStream(xlsFile);
workbook.write(xlsStream);