第一步：引入相关依赖

org.apache.poi

poi-ooxml

4.1.2

第二步：工具类

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationTargetException;

import java.util.ArrayList;

import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.*;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ImportExcel

{

/** 总行数 */

private int totalRows = 0;

/** 总列数 */

private int totalCells = 0;

/** 错误信息 */

private String errorInfo;

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;

}

/** 构造方法 */

public ImportExcel()

{

}

/**

*

* @描述：是否是2003的excel，返回true是2003

*

* @参数：@param filePath　文件完整路径

*

* @参数：@return

*

* @返回值：boolean

*/

public static boolean isExcel2003(String filePath)

{

return filePath.matches("^.+\\.(?i)(xls)$");

}

/**

*

* @描述：是否是2007的excel，返回true是2007

*

* @参数：@param filePath　文件完整路径

*

* @参数：@return

*

* @返回值：boolean

*/

public static boolean isExcel2007(String filePath)

{

return filePath.matches("^.+\\.(?i)(xlsx)$");

}

public static boolean isCSV(String filePath)

{

return filePath.matches("^.+\\.(?i)(csv)$");

}

public static boolean isTxt(String filePath)

{

return filePath.matches("^.+\\.(?i)(txt)$");

}

/**

*

* @描述：验证excel文件

*

* @参数：@param filePath　文件完整路径

*

* @参数：@return

*

* @返回值：boolean

*/

public boolean validateExcel(String filePath)

{

/** 检查文件名是否为空或者是否是Excel格式的文件 */

if (filePath == null || !(ImportExcel.isExcel2003(filePath) || ImportExcel.isExcel2007(filePath) ))

{

errorInfo = "文件名不是excel格式";

return false;

}

return true;

}

public List read(String filePath, Class cla, Integer sheetNo,Integer startRow)

{

try

{

if( startRow == null){

startRow = 1;

}

List listObjects = new ArrayList();

List> list = read(filePath,sheetNo, startRow);

Constructor[] constructors = cla.getDeclaredConstructors();

Constructor> constructor = null;

for (Constructor> item : constructors)

{

if (item.getParameterTypes().length == 1)//获取一个参数的构造方法

{

constructor = item;

}

}

if (list != null)

{

for (int i = 0; i < list.size(); i++)

{

Object p = cla.newInstance();

List cellList = list.get(i);

p = constructor.newInstance(cellList);

listObjects.add(p);

}

}

return listObjects;

}

catch (InstantiationException e)

{

e.printStackTrace();

errorInfo = "解析excel数据出现错误";

return null;

}

catch (IllegalArgumentException e)

{

e.printStackTrace();

errorInfo = "解析excel数据出现错误";

return null;

}

catch (IllegalAccessException e)

{

e.printStackTrace();

errorInfo = "解析excel数据出现错误";

return null;

}

catch (InvocationTargetException e)

{

e.printStackTrace();

errorInfo = "excel文件模版错误";

return null;

}

catch (SecurityException e)

{

e.printStackTrace();

errorInfo = "解析excel数据出现错误";

return null;

}

}

/**

*

* @描述：根据文件名读取excel文件

*

* @参数：@param filePath 文件完整路径

*

* @参数：@return

*

* @返回值：List

*/

public List> read(String filePath, Integer sheetNo,Integer startRow)

{

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 = true;

if (ImportExcel.isExcel2007(filePath))

{

isExcel2003 = false;

}

/** 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, sheetNo, startRow);

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;

}

/**

*

* @描述：根据流读取Excel文件

*

* @参数：@param inputStream

*

* @参数：@param isExcel2003

*

* @参数：@return

*

* @返回值：List

*/

public List> read(InputStream inputStream, boolean isExcel2003, Integer sheetNo,Integer startRow)

{

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, sheetNo, startRow);

}

catch (IOException e)

{

e.printStackTrace();

}

return dataLst;

}

/**

*

* @描述：读取数据

*

* @参数：@param Workbook

*

* @参数：@param sheetNo

*

* @参数：@return

*

* @返回值：List>

*/

private List> read(Workbook wb, Integer sheetNo,Integer startRow)

{

List> dataLst = new ArrayList>();

/** 得到第一个shell */

Sheet sheet = null;

if(sheetNo == null){

sheet = wb.getSheetAt(0);

}else{

sheet = wb.getSheetAt(sheetNo.intValue());

}

/** 得到Excel的行数 */

this.totalRows = sheet.getPhysicalNumberOfRows();

/** 得到Excel的列数 */

if (this.totalRows >= 1 && sheet.getRow(startRow) != null)

{

this.totalCells = sheet.getRow(startRow).getPhysicalNumberOfCells();

}

/** 循环Excel的行 */

for (int r = startRow; 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 NUMERIC: // 数字

cellValue = String.valueOf(cell.getNumericCellValue());

break;

case STRING: // 字符串

cellValue = cell.getStringCellValue();

break;

case BOOLEAN: // Boolean

cellValue = cell.getBooleanCellValue() + "";

break;

case FORMULA: // 公式

cellValue = cell.getCellFormula() + "";

break;

case BLANK: // 空值

cellValue = "";

break;

case 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;

}

}

第三步：运行

/**

*

* @描述：main测试方法

*

* @参数：@param args

*

* @参数：@throws Exception

*

* @返回值：void

*/

public static void main(String[] args) throws Exception

{

ImportExcel poi = new ImportExcel();

List> list = poi.read("/Users/zhuangjy/Desktop/test.xlsx",1,0);

if (list != null) {

for (int i = 0; i < list.size(); i++) {

System.out.print("第" + (i) + "行");

List cellList = list.get(i);

for (int j = 0; j < cellList.size(); j++) {

System.out.print(" " + cellList.get(j));

}

System.out.println();

}

}

}

效果截图