excel读写工具类

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package com.ctg.util;

import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
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;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;
import java.util.ArrayList;
import java.util.List;

excel读写工具类
*/
public class POIUtil {
private static Logger logger = Logger.getLogger(POIUtil.class);
private final static String xls = “xls”;
private final static String xlsx = “xlsx”;

 /** 
  * 读入excel文件，解析后返回 
  * @param file 
  * @throws IOException  
  */  
 public static List<String[]> readExcel(MultipartFile file) throws IOException{
     //检查文件  
     checkFile(file);  
     //获得Workbook工作薄对象  
     Workbook workbook = getWorkBook(file);  
     //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回  
     List<String[]> list = new ArrayList<String[]>();  
     if(workbook != null){  
         for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){  
             //获得当前sheet工作表  
             Sheet sheet = workbook.getSheetAt(sheetNum);  
             if(sheet == null){  
                 continue;  
             }  
             //获得当前sheet的开始行  
             int firstRowNum  = sheet.getFirstRowNum();  
             //获得当前sheet的结束行  
             int lastRowNum = sheet.getLastRowNum();  
             //循环除了第一行的所有行  
             for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){  
                 //获得当前行  
                 Row row = sheet.getRow(rowNum);  
                 if(row == null){  
                     continue;  
                 }  
                 //获得当前行的开始列  
                 int firstCellNum = row.getFirstCellNum();  
                 //获得当前行的列数  
                 int lastCellNum = row.getLastCellNum();  
                 String[] cells = new String[row.getLastCellNum()];  
                 //循环当前行  
                 for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){  
                     Cell cell = row.getCell(cellNum);  
                     cells[cellNum] = getCellValue(cell);  
                 }  
                 list.add(cells);  
             }  
         }  
         workbook.close();  
     }  
     return list;  
 }

public static List<String[]> readXLSXExcelFromSteam(InputStream inputStream) throws IOException, InvalidFormatException {
//检查文件

 //获得Workbook工作薄对象
 Workbook workbook = getWorkBookOfXLSX(inputStream);
 //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
 List<String[]> list = new ArrayList<String[]>();
 if(workbook != null){
 	for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
 		//获得当前sheet工作表
 		Sheet sheet = workbook.getSheetAt(sheetNum);
 		if(sheet == null){
 			continue;
 		}
 		//获得当前sheet的开始行
 		int firstRowNum  = sheet.getFirstRowNum();
 		//获得当前sheet的结束行
 		int lastRowNum = sheet.getLastRowNum();
 		//循环除了第一行的所有行
 		for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
 			//获得当前行
 			Row row = sheet.getRow(rowNum);
 			if(row == null){
 				continue;
 			}
 			//获得当前行的开始列
 			int firstCellNum = row.getFirstCellNum();
 			//获得当前行的列数
 			int lastCellNum = row.getLastCellNum();
 			String[] cells = new String[row.getLastCellNum()];
 			//循环当前行
 			for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
 				Cell cell = row.getCell(cellNum);
 				cells[cellNum] = getCellValue(cell);
 			}
 			list.add(cells);
 		}
 	}
 	workbook.close();
 }
 return list;

}

public static List<String[]> readXLSExcelFromSteam(InputStream inputStream) throws IOException{
//检查文件

 //获得Workbook工作薄对象
 Workbook workbook = getWorkBookOfXLS(inputStream);
 //创建返回对象，把每行中的值作为一个数组，所有行作为一个集合返回
 List<String[]> list = new ArrayList<String[]>();
 if(workbook != null){
 	for(int sheetNum = 0;sheetNum < workbook.getNumberOfSheets();sheetNum++){
 		//获得当前sheet工作表
 		Sheet sheet = workbook.getSheetAt(sheetNum);
 		if(sheet == null){
 			continue;
 		}
 		//获得当前sheet的开始行
 		int firstRowNum  = sheet.getFirstRowNum();
 		//获得当前sheet的结束行
 		int lastRowNum = sheet.getLastRowNum();
 		//循环除了第一行的所有行
 		for(int rowNum = firstRowNum+1;rowNum <= lastRowNum;rowNum++){
 			//获得当前行
 			Row row = sheet.getRow(rowNum);
 			if(row == null){
 				continue;
 			}
 			//获得当前行的开始列
 			int firstCellNum = row.getFirstCellNum();
 			//获得当前行的列数
 			int lastCellNum = row.getLastCellNum();
 			String[] cells = new String[row.getLastCellNum()];
 			//循环当前行
 			for(int cellNum = firstCellNum; cellNum < lastCellNum;cellNum++){
 				Cell cell = row.getCell(cellNum);
 				cells[cellNum] = getCellValue(cell);
 			}
 			list.add(cells);
 		}
 	}
 	workbook.close();
 }
 return list;

}

public static void checkFile(MultipartFile file) throws IOException{
//判断文件是否存在
if(null == file){
logger.error(“文件不存在！”);
throw new FileNotFoundException(“文件不存在！”);
}
//获得文件名
String fileName = file.getOriginalFilename();
//判断文件是否是excel文件
if(!fileName.endsWith(xls) && !fileName.endsWith(xlsx)){
logger.error(fileName + “不是excel文件”);
throw new IOException(fileName + “不是excel文件”);
}
}
public static Workbook getWorkBook(MultipartFile file) {
//获得文件名
String fileName = file.getOriginalFilename();
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {
//获取excel文件的io流
InputStream is = file.getInputStream();
//根据文件后缀名不同(xls和xlsx)获得不同的Workbook实现类对象
if(fileName.endsWith(xls)){
//2003
workbook = new HSSFWorkbook(is);
}else if(fileName.endsWith(xlsx)){
//2007
workbook = new XSSFWorkbook(is);
}
} catch (IOException e) {
logger.info(e.getMessage());
}
return workbook;
}

public static Workbook getWorkBookOfXLSX(InputStream inputStream) throws InvalidFormatException {
//获得文件名
//创建Workbook工作薄对象，表示整个excel
Workbook workbook = null;
try {

     byte[] buffer = new byte[inputStream.available()];
     inputStream.read(buffer);

     File targetFile = new File("src/main/resources/targetFile.tmp");
     OutputStream outStream = new FileOutputStream(targetFile);
     outStream.write(buffer);

//
// byte[] buffer = new byte[inputStream.available()];
// inputStream.read(buffer);
workbook = new XSSFWorkbook(targetFile);
// workbook = new HSSFWorkbook(inputStream);

	} catch (IOException e) {
		e.printStackTrace();
		logger.info(e.getMessage());
	}
	return workbook;
}

public static Workbook getWorkBookOfXLS(InputStream inputStream) {
	//获得文件名
	//创建Workbook工作薄对象，表示整个excel
	Workbook workbook = null;
	try {
		workbook = new HSSFWorkbook(inputStream);
	} catch (IOException e) {
		logger.info(e.getMessage());
	}
	return workbook;
}

public static String getCellValue(Cell cell){
        String cellValue = "";  
        if(cell == null){  
            return cellValue;  
        }  
        //把数字当成String来读，避免出现1读成1.0的情况  
        if(cell.getCellType() == Cell.CELL_TYPE_NUMERIC){  
            cell.setCellType(Cell.CELL_TYPE_STRING);  
        }  
        //判断数据的类型  
        switch (cell.getCellType()){  
            case Cell.CELL_TYPE_NUMERIC: //数字  
                cellValue = String.valueOf(cell.getNumericCellValue());  
                break;  
            case Cell.CELL_TYPE_STRING: //字符串  
                cellValue = String.valueOf(cell.getStringCellValue());  
                break;  
            case Cell.CELL_TYPE_BOOLEAN: //Boolean  
                cellValue = String.valueOf(cell.getBooleanCellValue());  
                break;  
            case Cell.CELL_TYPE_FORMULA: //公式  
                cellValue = String.valueOf(cell.getCellFormula());  
                break;  
            case Cell.CELL_TYPE_BLANK: //空值   
                cellValue = "";  
                break;  
            case Cell.CELL_TYPE_ERROR: //故障  
                cellValue = "非法字符";  
                break;  
            default:  
                cellValue = "未知类型";  
                break;  
        }  
        return cellValue;  
    }

}