使用POI操作XLS文件

package test.tool.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

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 test.tool.path.PathTool;

/*
 * 操作Excel工具类，建议首先将excel单元格设置成文本（设置单元格格式——数字——文本），
 * 否则取出的数据可能会发生格式的转变。
 * 目前仅支持xls文件，不支持xlsx。
 * 目前对于空字符串的约定：当从excel取出来的值是""时，执行往数据库插入数据时，需要加个判断，如果=="",则拼接sql可以处理成字段=''
 */
public class ExcelTool {

	/*
	 * 获取excel File
	 * return java.io.file
	 */
	public static File getExcelFile(String excel_file_dir){
	
		String excel_file = PathTool.getTestDataPath()+excel_file_dir;
		File excelFile = new File(excel_file);
		
		if(!excelFile.exists()){
			throw new RuntimeException(excel_file+" 文件不存在！");
		}
		if(!excelFile.getName().endsWith(".xls")){
			throw new RuntimeException(excel_file+" 文件类型不正确，只允许.xls结尾的文件！");
		}
		return excelFile;
	}

	/*
	 * 获取指定标签页名称的数据
	 */
	public static List<Map<String,Object>> getExcelRecords(String excel_file_dir,String sheetName){
		if(sheetName==null){
			throw new RuntimeException("标签页名称不能为空！");
		}
		return getExcelRecords(excel_file_dir, sheetName, -1);
	}
	/*
	 * 获取指定标签页索引的数据
	 */
	public static List<Map<String,Object>> getExcelRecords(String excel_file_dir,int sheetIndex){
		if(sheetIndex<0){
			throw new RuntimeException("指定标签页索引不合法，请输入非负数！");
		}
		return getExcelRecords(excel_file_dir, null, sheetIndex);
	}
	/*
	 * 获取指定excel文件、指定标签页（标签页名称、标签页索引）的内容，返回值格式：List<List<Object>>
	 * 入参excel_file格式：bpm\\test1.xls,bsp\\test2.xls
	 */
	private static List<Map<String,Object>> getExcelRecords(String excel_file_dir,String sheetName,int sheetIndex){
		
		File excelFile = getExcelFile(excel_file_dir);
		List<Map<String,Object>> recordList = new ArrayList<Map<String,Object>>();
		HSSFWorkbook workbook=null;
		
			try {
				workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		
		
		//获取指定标签页   
		HSSFSheet sheet = null;
		if(sheetName==null){
			sheet = workbook.getSheetAt(sheetIndex);
			if(sheet==null){
				throw new RuntimeException(sheetIndex+" 标签页不存在！");
			}
		}else{		
			sheet = workbook.getSheet(sheetName);
			if(sheet==null){
				throw new RuntimeException(sheetName+" 标签页不存在！");
			}
		}
		
	
		//总行数
		int rows = sheet.getPhysicalNumberOfRows();
		if (rows < 2) {
			throw new RuntimeException(excelFile.getName()+" 内容为空，请重新编辑！");
		}

		//不为空的单元格数  ，第一行是标题列
		HSSFRow keyRow = sheet.getRow(0);
		int cellNumber = keyRow.getPhysicalNumberOfCells();
		
		//循环遍历，第一行是标题，所以从 1 开始遍历（0表示第一行，1表示第二行）
		 for (int r = 1; r < rows; r++) {
			Map<String,Object> record = new LinkedHashMap<String,Object>();//使用HashMap的话，存进去的顺序与取出来的顺序是不一致的，此处需要使用LinkedHashMap
			HSSFRow row = sheet.getRow(r);
				Object value = null;
				 for (int c = 0; c < cellNumber; c++) //共cellNumber列
				{
					HSSFCell cell = row.getCell(c);

					//如果单元格不为空
					if (cell != null) {				
						switch (cell.getCellType()) {
						case HSSFCell.CELL_TYPE_FORMULA:
							break;
						case HSSFCell.CELL_TYPE_NUMERIC:
							//对数字进行格式化，使其不自动转化为科学计数法。
							java.text.NumberFormat nf = java.text.NumberFormat.getInstance(); 
							nf.setGroupingUsed(false); 
							value = nf.format( new Double(cell.getNumericCellValue()));
							break;
						case HSSFCell.CELL_TYPE_STRING:
							value = cell.getStringCellValue();
							break;
						case HSSFCell.CELL_TYPE_BLANK:
							value = null;
							break;
						default:
							value = null;
						}
					}else{
						value=null;
					}
					record.put(keyRow.getCell(c).getStringCellValue(),value);
				}
				 recordList.add(record);
		}	
		return recordList;
	}
	/*
	 * 获取excel的sheet个数
	 */
	public static int getNumberOfSheets(String excel_file_dir){
		File excelFile = getExcelFile(excel_file_dir);
		HSSFWorkbook workbook=null;
		int numberOfSheets = 0;
		try {
			workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			numberOfSheets = workbook.getNumberOfSheets();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return numberOfSheets;
	}
	
	/*
	 * 根据sheetIndex获取sheetName
	 */
	public static String getSheetNameBySheetIndex(String excel_file_dir,int sheetIndex){
		File excelFile = getExcelFile(excel_file_dir);
		HSSFWorkbook workbook=null;
		String sheetName = null;
		try {
			workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			sheetName = workbook.getSheetName(sheetIndex);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return sheetName;
	}
	
	/*
	 * 获取指定选项卡（索引）的行数
	 */
	public static int getRowsOfSheet(String excel_file_dir,int sheetIndex){
		File excelFile = getExcelFile(excel_file_dir);
		HSSFWorkbook workbook=null;
		int rowsOfSheet = 0;
		try {
			workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			rowsOfSheet = workbook.getSheetAt(sheetIndex).getPhysicalNumberOfRows();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return rowsOfSheet;
	}
	/*
	 * 获取指定选项卡（名称）的行数
	 */
	public static int getRowsOfSheet(String excel_file_dir,String sheetName){
		File excelFile = getExcelFile(excel_file_dir);
		HSSFWorkbook workbook=null;
		int rowsOfSheet = 0;
		try {
			workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			rowsOfSheet = workbook.getSheet(sheetName).getPhysicalNumberOfRows();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return rowsOfSheet;
	}
	/*
	 * 获取指定sheet、指定row、指定colum对应的cell的value
	 * return:List[title,value],第一个元素是title，第二个元素是value
	 * row/cell都是从0开始计算
	 */
	public static List<String> getCell(String excel_file_dir,int sheetIndex,int rowIndex,int cellIndex){
		
		File excelFile = getExcelFile(excel_file_dir);
		List<String> keyValueList = new ArrayList<String>();
		HSSFWorkbook workbook=null;
		String key = null;
		String value = null;
		try {
			workbook = new HSSFWorkbook(new FileInputStream(excelFile));
			key = workbook.getSheetAt(sheetIndex).getRow(0).getCell(cellIndex).getStringCellValue();//第一行（row 0）是标题列
			HSSFCell cell = workbook.getSheetAt(sheetIndex).getRow(rowIndex).getCell(cellIndex);
			if(cell==null){
				value = null;
			}else{
				if(cell.getCellType()==HSSFCell.CELL_TYPE_NUMERIC){//如果是数字类型
					NumberFormat nf = NumberFormat.getInstance(); 
					nf.setGroupingUsed(false); 
					value = nf.format( new Double(cell.getNumericCellValue()));
				}else if(cell.getCellType()==HSSFCell.CELL_TYPE_STRING){	//如果是文本类型	
					value = cell.getStringCellValue();
				}else{//否则全部视为null
					value=null;
				}
			}
			keyValueList.add(key);
			keyValueList.add(value);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return keyValueList;
	}
}