java读写excel

实验环境：windows8.1，eclipse4.4， jre8

需要jar包：若是.xls格式，可用jxl.jar，下载；若是.xlsx格式，使用poi，下载

1..xls格式

写文件

public void writeXls(String filepath) {
		try {
			WritableWorkbook book = Workbook.createWorkbook(new File(filepath));
			WritableSheet sheet = book.createSheet("first_sheet", 0);
			
			jxl.write.Number number = null;
			
			for (int i = 0; i < 5; i++) {// 5行
				for (int j = 0; j < 3; j++) {// 3列
					number = new jxl.write.Number(j, i, i + j);
					sheet.addCell(number);
				}
			}
			book.write();
			book.close();
		} catch (RowsExceededException e) {
			e.printStackTrace();
		} catch (WriteException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

读文件

public void readXls(String filepath) {
		jxl.Workbook readwb = null;
		try {
			// 构建Workbook对象, 只读Workbook对象
			// 直接从本地文件创建Workbook
			InputStream instream = new FileInputStream(filepath);
			readwb = Workbook.getWorkbook(instream);
			
			// Sheet的下标是从0开始
			// 获取第一张Sheet表
			Sheet readsheet = readwb.getSheet(0);
			
			// 获取Sheet表中所包含的总列数
			int rsColumns = readsheet.getColumns();
			
			// 获取Sheet表中所包含的总行数
			int rsRows = readsheet.getRows();
			
			Cell cell = null;
			String line = "";
			
			// 获取指定单元格的对象引用 ,从第一行第一列开始，即非说明数据
			for (int i = 0; i < rsRows; i++) {
				for (int j = 0; j < rsColumns; j++) {
					cell = readsheet.getCell(j, i);
					line = line + "\t" + cell.getContents();
				}
				System.out.println(line);
				line = "";
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			readwb.close();
		}
	}

2..xlsx格式

写文件

public void writeXlsx(String filepath) {
		XSSFWorkbook wb = null;
		try {
			// 构建Workbook对象, 只读Workbook对象
			// 直接从本地文件创建Workbook
			wb = new XSSFWorkbook();
			
			// Sheet的下标是从0开始
			// 获取第一张Sheet表
			XSSFSheet sheet = wb.createSheet("fist_sheet");
			
			// 设置Sheet表中所包含的总行数
			int rsRows = 5;
			
			// 设置Sheet表中所包含的总列数
			int rsColumns = 3;
			
			// 从第0行第0列开始
			for (int i = 0; i < rsRows; i++) {
				XSSFRow row = sheet.createRow(i);
				
				for (int j = 0; j < rsColumns; j++) {
					XSSFCell cell = row.createCell(j);
					// String data = new CellReference(cell).formatAsString();
					cell.setCellValue("test_" + i + j);
				}
			}
			FileOutputStream os = new FileOutputStream(filepath);
			wb.write(os);
			os.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

读文件

public void readXlsx(String filepath) {
		XSSFWorkbook readwb = null;
		try {
			// 构建Workbook对象, 只读Workbook对象
			// 直接从本地文件创建Workbook
			readwb = new XSSFWorkbook(new FileInputStream(filepath));
			
			// Sheet的下标是从0开始
			// 获取第一张Sheet表
			XSSFSheet readsheet = readwb.getSheetAt(0);
			
			// 获取Sheet表中所包含的总行数
			int rsRows = readsheet.getPhysicalNumberOfRows();
			
			XSSFRow row = null;
			String line = "";
			
			// 获取指定单元格的对象引用 ,从第一行第一列开始，即非说明数据
			for (int i = 0; i < rsRows; i++) {
				row = readsheet.getRow(i);
				// 获取Sheet表中所包含的总列数
				int rsColumns = row.getPhysicalNumberOfCells();
				
				for (int j = 0; j < rsColumns; j++) {
					line = line + "\t" + row.getCell(j).toString();
				}
				System.out.println(line);
				line = "";
			}
			readwb.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}