java poi 导入excel

            package
             example.poi;

            import java.io.*;
import java.text.DecimalFormat;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;
publicclass ImportExcel {
  
 private Workbook wb = null;
 private Sheet sheet = null;
 private Row row = null;
 privateint sheetNum = 0;
 privateint rowNum = 0;
 private FileInputStream fis = null;
 private File file = null;
 private DecimalFormat df = new DecimalFormat("0");
 public ImportExcel() {
  super();
 }
 publicvoid setSheetNum(int sheetNum) {
  this.sheetNum = sheetNum;
 }
 publicvoid setRowNum(int rowNum) {
  this.rowNum = rowNum;
 }
 publicvoid setFile(File file) {
  this.file = file;
 }
 /**
  * 读取excel文件获得HSSFWorkbook对象
  * @throws IOException
  */publicvoid open(String filePath) throws IOException {
  if(validateExcel(filePath)) {
   file = new File(filePath);
   fis = new FileInputStream(file);
   if(isExcel2003(filePath)) {
    wb = new HSSFWorkbook(fis);
   } else {
    wb = new XSSFWorkbook(fis);
   }
   fis.close();
  }
 }
  
 /**
  * 获取sheet表数目
  * @return sheet表数目
  */publicint getSheetCount() {
  int sheetCount = -1;
  sheetCount = wb.getNumberOfSheets();
  return sheetCount;
 }
  
 /**
  * 获取sheetNum下的记录行数
  * @return 记录行数
  */publicint getRowCount() {
  if(wb == null) {
   System.err.println("----------->WorkBook为空");
  }
  Sheet sheet = wb.getSheetAt(this.sheetNum);
  int rowCount = -1;
  rowCount = sheet.getLastRowNum();
  return rowCount;
 }
  
 /**
  * 获取指定sheetNum的记录行数
  * @param sheetNum 表编号
  * @return 记录行数
  */publicint getRowCount(int sheetNum) {
  Sheet sheet = wb.getSheetAt(sheetNum);
  int rowCount = -1;
  rowCount = sheet.getLastRowNum();
  return rowCount;
 }
  
 /**
  * 得到指定行的内容
  * @param lineNum 行数
  * @return 内容
  */public String[] readExcelLine(int lineNum) {
  return readExcelLine(this.sheetNum, lineNum);
 }
  
 /**
  * 获取指定工作表和行数的内容
  * @param sheetNum 表编号
  * @param lineNum 行数
  * @return 内容
  */public String[] readExcelLine(int sheetNum, int lineNum) {
  if(sheetNum < 0 || lineNum < 0) {
   returnnull;
  }
  String[] strExcelLine = null;
  try {
   sheet = wb.getSheetAt(sheetNum);
   row = sheet.getRow(lineNum);
    
   int cellCount = row.getLastCellNum();
   strExcelLine = new String[cellCount + 1];
   for(int i = 0; i <= cellCount; i++) {
    strExcelLine[i] = readStringExcelCell(lineNum, i);
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return strExcelLine;
 }
  
 /**
  * 获取指定列的内容
  * @param cellNum 列编号
  * @return 内容
  */public String readStringExcelCell(int cellNum) {
  return readStringExcelCell(this.rowNum, cellNum);
 }
  
 /**
  * 获取指定行和列编号的内容
  * @param rowNum 行编号
  * @param cellNum 列编号
  * @return 内容
  */public String readStringExcelCell(int rowNum, int cellNum) {
  return readStringExcelCell(this.sheetNum, rowNum, cellNum);
 }
  
 /**
  * 获取指定工作表、行、列的内容
  * @param sheetNum 表编号
  * @param rowNum 行编号
  * @param cellNum 列编号
  * @return 内容
  */public String readStringExcelCell(int sheetNum, int rowNum, int cellNum) {
  if(sheetNum < 0 || rowNum < 0) {
   return "";
  }
  String strExcelCell = "";
  try {
   sheet = wb.getSheetAt(sheetNum);
   row = sheet.getRow(rowNum);
    
   if(row.getCell(cellNum) != null) {
    switch(row.getCell(cellNum).getCellType()) {
    case HSSFCell.CELL_TYPE_FORMULA:
     strExcelCell = "FORMULA";
     break;
    case HSSFCell.CELL_TYPE_NUMERIC:
     //strExcelCell = String.valueOf(row.getCell(cellNum).getNumericCellValue());
     //防止科学计数，不需要的话可以用上一行
     strExcelCell = decimalFormat(row.getCell(cellNum).getNumericCellValue());
     break;
    case HSSFCell.CELL_TYPE_STRING:
     strExcelCell = row.getCell(cellNum).getStringCellValue();
     break;
    case HSSFCell.CELL_TYPE_BLANK:
     strExcelCell = "";
     break;
    default:
     strExcelCell = "";
     break;
    }
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return strExcelCell;
 }
  
 /**
  * 测试
  * @param args
  */publicstaticvoid main(String[] args) {
  String filePath = "C:\\Users\\Administrator\\Desktop\\工作簿1.xlsx";
  ImportExcel ie = new ImportExcel();
  try {
   ie.open(filePath);
  } catch (IOException e) {
   e.printStackTrace();
  }
  ie.setSheetNum(0);
  int count = ie.getRowCount();
  for (int i = 0; i <= count; i++) {
   String[] rows = ie.readExcelLine(i);
   for (int j = 0; j < rows.length; j++) {
    System.out.print(rows[j] + " ");
   }
   System.out.print("\n");
  }
 }
  
 /**
  * 验证文件是否存在以及是否是excel文件
  * @param filePath
  * @return 结果
  */publicboolean validateExcel(String filePath) {
  if(filePath == null || ! (isExcel2003(filePath) || isExcel2007(filePath))) {
   System.err.println("文件不是excel文件！");
   returnfalse;
  }
  File file = new File(filePath);
  if(file == null || ! file.exists()) {
   System.err.println("文件不存在！");
   returnfalse;
  }
  returntrue;
 }
  
 /**
  * 判断是否是2003版excel
  * @param filePath 文件路径
  * @return 结果
  */publicboolean isExcel2003(String filePath) {
  return filePath.matches("^.+\\.(?i)(xls)$");
 }
  
 /**
  * 判断是否是2007版excel
  * @param filePath 文件路径
  * @return 结果
  */publicboolean isExcel2007(String filePath) {
  return filePath.matches("^.+\\.(?i)(xlsx)$");
 }
  
 /**
  * 将获取到的数据类型转换成String防止科学计数法
  * @param decimal 数据
  * @return 结果
  */public String decimalFormat(Double decimal) {
  return df.format(decimal);
 }
}