趁著不忙，抽空寫了個用poi操作excel匯入匯出的功能的小例子。不多說，直接上程式碼！

poi的操作類：

package com.bao.excelUtil;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Row;

/**
 * 操作excel的工具類
 * @author Alex
 */
public class ExcelUtil {

	/**
	 * 建立一個excel,返回一個excel物件
	 * @param sheetName
	 * @param orderList
	 * @return HSSFWorkbook
	 * @throws Exception
	 * @author Alex
	 */
	public static HSSFWorkbook createExcel(String filePath, String sheetName, List<String[]> orderList) throws Exception {
		FileOutputStream fileOutputStream =  new FileOutputStream(filePath);
		HSSFWorkbook wb = new HSSFWorkbook(); //建立一個工作區
		try {
			HSSFSheet sheet = wb.createSheet(sheetName); //建立一個sheet頁
			  //建立第一行,如果有多個sheet頁可以自己進行拓展
			HSSFCell cell = null;                  
			if (orderList != null) {
				for (int i = 0; i < orderList.size(); i++) {
					HSSFRow row = sheet.createRow(i); 
					String[] con = (String[]) orderList.get(i);
					for (int j = 0; j < con.length; j++) {
						if (i == 0) {  //給第一行賦值,也就是標題行
							cell = row.createCell(j);
							cell.setCellValue(con[j]);
						} else {    //給其他行賦值,也就是資料
							cell = row.createCell(j);
							cell.setCellValue(con[j]);
						}
					}
				}
				CellStyle cellStyle2 = wb.createCellStyle();  //建立一個樣式物件
				cellStyle2.setAlignment(CellStyle.ALIGN_CENTER); //設定內容居中
			}
			wb.write(fileOutputStream);
		} catch (Exception e) {
			throw e;
		}finally {
			fileOutputStream.flush();
			fileOutputStream.close();
		}
		return wb;
	}

	/**
	 * 讀取excel資料的方法
	 * @param file
	 * @return List<HashMap>
	 * @throws Exception
	 * @author Alex
	 */
	public static List<String[]> getExcel(String filePath) throws Exception {
		List<String[]> dataList = new ArrayList<String[]>();
		File file = new File(filePath);
		FileInputStream fs = new FileInputStream(file);
		HSSFWorkbook wb = new HSSFWorkbook(fs); // 獲得工作
		HSSFSheet sheet = wb.getSheetAt(0); // 拿到第一個sheet頁
		Iterator<Row> rows = sheet.rowIterator(); // 拿到第一行
		while (rows.hasNext()) { // 如果有值
			HSSFRow row = (HSSFRow) rows.next(); // 拿到當前行
			if(row.getRowNum() != 0) {  //不讀取標題(可以根據自己需求進行修改)
				String[] data = new String[row.getLastCellNum()];
				Iterator<Cell> cells = row.cellIterator(); // 拿到當前行所有列的集合
				while (cells.hasNext()) {
					HSSFCell cell = (HSSFCell) cells.next(); // 拿到列值
					String cellValue = ""; // 存放單元格的值
					switch (cell.getCellType()) { // 判斷單元格的型別，取出單元格的值
					case HSSFCell.CELL_TYPE_NUMERIC:
						// 處理數字型別 去掉科學計數法格式
						double strCell = cell.getNumericCellValue();
						DecimalFormat formatCell = (DecimalFormat) NumberFormat.getPercentInstance();
						formatCell.applyPattern("0");
						String value = formatCell.format(strCell);
						if (Double.parseDouble(value) != strCell) {
							formatCell.applyPattern(Double.toString(strCell));
							value = formatCell.format(strCell);
						}
						cellValue = value;
						break;
					case HSSFCell.CELL_TYPE_STRING:
						cellValue = cell.getStringCellValue();
						break;
					case HSSFCell.CELL_TYPE_BOOLEAN:
						cellValue = String.valueOf(cell.getBooleanCellValue());
						break;
					case HSSFCell.CELL_TYPE_FORMULA:
						cellValue = cell.getCellFormula();
						break;
					default:
						break;
					}
					data[cell.getColumnIndex()] = cellValue;
				}
				dataList.add(data);
			}
		}
		return dataList;
	}
}
 

 測試poi的實現類:

package com.bao.test;

import java.util.ArrayList;
import java.util.List;

import com.bao.excelUtil.ExcelUtil;

public class testMain {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//模擬資料
		String filePath = "file/testDate.xls";
		String sheetName = "測試";
		List<String[]> testList = new ArrayList<String[]>();  
		String[] title = {"姓名","年齡","性別"};
		String[] data1 = {"張三","25","男"};
		String[] data2 = {"趙四","22","男"};
		String[] data3 = {"王武","12","男"};
		testList.add(title);
		testList.add(data1);
		testList.add(data2);
		testList.add(data3);
		try {
			//匯出excel
			//ExcelUtil.createExcel(filePath, sheetName, testList);
			//讀取excel
			List<String[]> result = ExcelUtil.getExcel(filePath);
			for(String[] data : result){
				for(int i = 0;i<data.length ;i++) {
					System.out.print(data[i] + "  ");
				}
				System.out.println();
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

}
 

用的jar包是poi-3.7-20101029.jar.如果大家想了解更多，直接下載api進行學習！寫的比較簡單，希望大家多多指點！