1.  用for迴圈讀取Excel

package com.csii.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class TestReadExcel {
	public static void main(String[] args) throws IOException {
		String filePath = "C:\\Users\\ljj\\Desktop\\workDay\\我的事件流\\公共交易試.xlsx";
		File file = new File(filePath);
		FileInputStream fileInputStream = null;
		try {
			fileInputStream = new FileInputStream(file);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}

		// 07版本以後的excel 物件
		XSSFWorkbook xssfWorkbook = new XSSFWorkbook(fileInputStream);
		// 獲取第一個工作表sheet
		XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
		// 獲取非空行
		int rowNum = xssfSheet.getLastRowNum();
		// 用於計數
		int i = 1;
		for (int indexRow = 0; indexRow < rowNum; indexRow++) {// 迴圈每一行
			XSSFRow xssfRow = xssfSheet.getRow(indexRow);
			int colNum = xssfRow.getLastCellNum();

			// 迴圈每一列
			for (int colIndex = 0; colIndex < colNum; colIndex++) {// 迴圈每一列
				// 建立一個 單元格（Cell） 物件
				Cell cell = xssfRow.getCell(colIndex);

				if (cell != null) {// 單元格非 null，才輸出
					String value = "";
					switch (cell.getCellType()) { // 單元格的三種類型：字元(STRING)、數值                    
                                                      （NUMERIC）、空白（BLANK）
					case STRING:
						value = cell.getStringCellValue();
						break;
					case NUMERIC:
						// 轉換成string型別
						value = String.valueOf(cell.getNumericCellValue());
						break;
					case BLANK:
						break;
					default:
						break;
					}
					System.out.println(i++ + ":" + value);

				} else {// 單元格為null,繼續尋找下一列的單元格
					continue;
				}
				
			}
		}

	}

}
 

測試資料如下： 

2. 用 Iterater 來迴圈，此方法比for迴圈更方便

public class ExcelRead{
	private static XSSFRow row;

	@SuppressWarnings("unused")
	public static void main(String[] args) throws IOException {
		String fileName = "C:\\Users\\ljj\\Desktop\\testExcel\\wc.xlsx";
		String[] arrExcel = readExcel(fileName);
		
		int i = 0;
		for (String string : arrExcel) {
			System.out.println(i + ":" + string);
		}

	}


	/**
	 * 返回一個欄位陣列
	 * @param fileName
	 * @return String[]
	 * @throws IOException
	 */
	@SuppressWarnings("unused")
	public static String[] readExcel(String fileName) throws IOException {

		File file = new File(fileName);
		if (file == null) {
			System.out.println("讀取檔案失敗！");
		}

		FileInputStream fileInputStream = new FileInputStream(file);
		// 建立excel物件
		XSSFWorkbook xssfWorkbook = new XSSFWorkbook(fileInputStream);
		if (file.exists() && file.isFile()) {
			System.out.println("open file succeed!");
		} else {
			System.out.println("Error to open openworkbook.xlsx file!");
		}
		// 獲取excel表物件
		XSSFSheet xssfSheet = xssfWorkbook.getSheetAt(0);
		Iterator<Row> rowIterator = xssfSheet.iterator();
		// 欄位名
		String strName = "";
		// 級欄位數
		int i = 0;
		// 存欄位陣列
		String[] arr = new String[24];
		while (rowIterator.hasNext()) {
			row = (XSSFRow) rowIterator.next();
			Iterator<Cell> cellIterator = row.cellIterator();
			while (cellIterator.hasNext()) {
                // 建立單元格物件
				Cell cell = cellIterator.next();
				switch (cell.getCellType()) {// 根據單元格型別分別獲取獲取值
				// string 型別
				case STRING:
                    // 獲取單元格值
					strName = cell.getStringCellValue();
					strName = strName.trim();
                    // 存入陣列中輸出
					arr[i++] = strName;
					break;
				// number型別
				case NUMERIC:
                    // 獲取單元格值
					strName = String.valueOf(cell.getNumericCellValue());
					strName = strName.trim();
                    // 存入陣列中輸出
					arr[i++] = strName;
					break;
				default:
					break;
				}
			}
		}
		return arr;
	}
}