excel表格操作（POI）

pom.xml

		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>4.0.1</version>
		</dependency>

ExcelUtil

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import org.apache.poi.EncryptedDocumentException;
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.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

import com.fs.model.system.ExamOptions;
import com.fs.model.system.ExamRecord;
import com.fs.model.system.Question;

public class ExcelUtil {
	//讀操作
	public static List<Question> getData(File file) {
		List<Question> exams = new ArrayList<>();
		// 獲得工作簿
		Workbook workbook = null;
		try {
			workbook = WorkbookFactory.create(file);
		} catch (EncryptedDocumentException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		// 獲得工作表個數
		int sheetCount = workbook.getNumberOfSheets();
		// 遍歷工作表
		for (int i = 0; i < sheetCount; i++) {
			Sheet sheet = workbook.getSheetAt(i);
			// 獲得行數
			int rows = sheet.getLastRowNum() + 1;
			// 獲得列數，先獲得一行，在得到該行列數
			Row tmp = sheet.getRow(0);
			if (tmp == null) {
				continue;
			}
			//int cols = tmp.getPhysicalNumberOfCells();
			// 讀取數據
			for (int row = 1; row < rows; row++) {
				Row r = sheet.getRow(row);
				Question question = new Question();
				List<String> options = new ArrayList<>();
				int col = 0;
				while(true) {
					String temp = "";
					try {
						r.getCell(col).setCellType(CellType.STRING);						
						temp = r.getCell(col).getStringCellValue();
					} catch (NullPointerException e) {
						temp = "";
					}
					ExamOptions option = new ExamOptions();
					switch (col) {
					case 0:
						question.setqName(temp);
						break;
					case 1:
						question.setqScore(Integer.parseInt(temp));
						break;
					case 2:
						question.setAnswer(temp);
						break;
					default:
						if (!"".equals(temp)) {
							options.add(temp);
							break;
						} else {
							break;
						}
					}
					if ("".equals(temp)) {
						break;
					} else {
						col++;
					}
				}
				question.setOptions(options);
				exams.add(question);
			}
		}
		return exams;
	}
	//寫操作
	public static String saveToServer(List<ExamRecord> records){
		HSSFWorkbook workbook = new HSSFWorkbook(); // 創建工作表
		HSSFSheet sheet = workbook.createSheet("sheet1");
		HSSFRow firstRow = sheet.createRow(0);
		firstRow.createCell(0).setCellValue("序號");
		firstRow.createCell(1).setCellValue("試題名稱");
		firstRow.createCell(2).setCellValue("用戶名");
		firstRow.createCell(3).setCellValue("開始時間");
		firstRow.createCell(4).setCellValue("考試用時");
		firstRow.createCell(5).setCellValue("試題總分");
		firstRow.createCell(6).setCellValue("用戶得分");
		firstRow.createCell(7).setCellValue("考試狀態");
		for (int row = 1; row <= records.size(); row++) {
			HSSFRow rows = sheet.createRow(row); 
			rows.createCell(0).setCellValue(row);
			rows.createCell(1).setCellValue(records.get(row-1).getExamType());
			rows.createCell(2).setCellValue(records.get(row-1).getUserName());
			rows.createCell(3).setCellValue(records.get(row-1).getStartTime());
			if (records.get(row-1).getExamTime() != null) {
				rows.createCell(4).setCellValue(records.get(row-1).getExamTime());				
			}
			if (records.get(row-1).getTotalScore() != null) {
				rows.createCell(5).setCellValue(records.get(row-1).getTotalScore());				
			}
			if (records.get(row-1).getUserScore() != null) {
				rows.createCell(6).setCellValue(records.get(row-1).getUserScore());				
			}
			rows.createCell(7).setCellValue(records.get(row-1).getExamState());
		}
		SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
		Date date = new Date();
		String nowDate = format.format(date);
		String url = "C:/Users/Administrator/Desktop/server_exam/record" + nowDate + ".xls";
		File xlsFile = new File(url); 
		FileOutputStream xlsStream; 
		try { 
			xlsStream = new FileOutputStream(xlsFile);
			workbook.write(xlsStream); 
		} catch (IOException e) {
		  	e.printStackTrace(); 
		}
		return url;
	}
	
}