导入excel的操作

 

 

 

对excel操作可分为三步：

1.读取excel文件生成WorkBook

2.对workBook的表格数据提取

3.对提取的数据加工处理

 

 

package excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
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.xssf.usermodel.XSSFWorkbook;


public class ReadExcel {
	
	/** 总行数 */
	private int totalRows = 0;
	
	/** 总列数 */
	private int totalCells = 0;
	
	/** 错误信息 */
	private String errorInfo;

	public ReadExcel() {

	}

	public int getTotalRows() {
		return totalRows;
	}

	public void setTotalRows(int totalRows) {
		this.totalRows = totalRows;
	}

	public int getTotalCells() {
		return totalCells;
	}

	public void setTotalCells(int totalCells) {
		this.totalCells = totalCells;
	}

	public String getErrorInfo() {
		return errorInfo;
	}

	public void setErrorInfo(String errorInfo) {
		this.errorInfo = errorInfo;
	}


	public boolean validateExcel(String filePath) {
		/** 检查文件名是否是Excel格式的文件 */
		if (isExcel2003(filePath)||isExcel2007(filePath)) {
			
		}else {
			errorInfo = "文件名不是excel格式";
			return false;
		}
		/** 检查文件是否存在 */
		File file = new File(filePath);
		if (file == null || !file.exists()) {
			errorInfo = "文件不存在";
			return false;
		}
		return true;
	}

	public List> read(String filePath) {
		List> dataLst = new ArrayList>();
		InputStream is = null;
		try {
			/** 验证文件是否合法 */
			if (!validateExcel(filePath)) {
				System.out.println(errorInfo);
				return null;
			}
			/** 判断文件的类型，是2003还是2007 */
			boolean isExcel2003 = isExcel2003(filePath);
			/** 调用本类提供的根据流读取的方法 */
			File file = new File(filePath);
			is = new FileInputStream(file);
			dataLst = read(is, isExcel2003);
			is.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					is = null;
					e.printStackTrace();
				}
			}
		}
		/** 返回最后读取的结果 */
		return dataLst;
	}


	public List> read(InputStream inputStream, boolean isExcel2003) {
		List> dataLst = null;
		try {
			/** 根据版本选择创建Workbook的方式 */
			Workbook wb = null;
			if (isExcel2003) {
				wb = new HSSFWorkbook(inputStream);
			} else {
				wb = new XSSFWorkbook(inputStream);
			}
			dataLst = read(wb);
		} catch (IOException e) {
			e.printStackTrace();
		}
		return dataLst;
	}


	private List> read(Workbook wb) {
		List> dataLst = new ArrayList>();
		/** 得到第一个sheet 第一张工作表 */
		Sheet sheet = wb.getSheetAt(0);
		/** 得到Excel的行数 */
		this.totalRows = sheet.getPhysicalNumberOfRows();
		/** 得到Excel的列数 */
		if (this.totalRows >= 1 && sheet.getRow(0) != null) {
			this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
		}
		/** 循环Excel的行 */
		for (int r = 0; r < this.totalRows; r++) {
			Row row = sheet.getRow(r);
			if (row == null) {
				continue;
			}
			List rowLst = new ArrayList();
			/** 循环Excel的列 */
			for (int c = 0; c < this.getTotalCells(); c++) {
				Cell cell = row.getCell(c);
				String cellValue = "";
				if (null != cell) {
					// 以下是判断数据的类型
					switch (cell.getCellType()) {
					case HSSFCell.CELL_TYPE_NUMERIC: // 数字
						cellValue = cell.getNumericCellValue() + "";
						break;
					case HSSFCell.CELL_TYPE_STRING: // 字符串
						cellValue = cell.getStringCellValue();
						break;
					case HSSFCell.CELL_TYPE_BOOLEAN: // Boolean
						cellValue = cell.getBooleanCellValue() + "";
						break;
					case HSSFCell.CELL_TYPE_FORMULA: // 公式
						cellValue = cell.getCellFormula() + "";
						break;
					case HSSFCell.CELL_TYPE_BLANK: // 空值
						cellValue = "";
						break;
					case HSSFCell.CELL_TYPE_ERROR: // 故障
						cellValue = "非法字符";
						break;
					default:
						cellValue = "未知类型";
						break;
					}
				}
				rowLst.add(cellValue);
			}
			/** 保存第r行的第c列 */
			dataLst.add(rowLst);
		}
		return dataLst;
	}
	public List getExcel(){
		ReadExcel poi = new ReadExcel();
		List> list = poi.read("D:\\Sim\\Project\\Excel\\test1.xlsx");
		List arr=new ArrayList();
		if (list != null) {
			for (int i = 0; i < list.size(); i++) {
				List cellList = list.get(i);
				Sim sim=new Sim();
//				for (int j = 0; j < cellList.size(); j++) {
					sim.setLine1(cellList.get(0));
					sim.setLine2(cellList.get(1));
					sim.setLine3(cellList.get(2));
					sim.setLine4(cellList.get(3));
					arr.add(sim);
//				}
			}

		}

		return arr;
	}
	
	public static boolean isExcel2003(String filePath) {
		return filePath.matches("^.+\\.(?i)(xls)$");
	}
	public static boolean isExcel2007(String filePath) {
		return filePath.matches("^.+\\.(?i)(xlsx)$");
	}
}