Excle 读取操作

package com;


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;


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 org.apache.poi.poifs.filesystem.POIFSFileSystem;


/**
 * 用于读取excel
 */
public class ExcelReader {
 private HSSFWorkbook wb = null;// book [includes sheet]


 private HSSFSheet sheet = null;


 private HSSFRow row = null;


 private int sheetNum = 0; // 第sheetnum个工作表


 private int rowNum = 0;


 private FileInputStream fis = null;


 private File file = null;


 public ExcelReader() {
 }


 public ExcelReader(File file) {
  this.file = file;
 }


 public void setRowNum(int rowNum) {
  this.rowNum = rowNum;
 }


 public void setSheetNum(int sheetNum) {
  this.sheetNum = sheetNum;
 }


 public void setFile(File file) {
  this.file = file;
 }


 /**
  * 读取excel文件获得HSSFWorkbook对象
  */
 public void open() throws IOException {
  fis = new FileInputStream(file);
  wb = new HSSFWorkbook(new POIFSFileSystem(fis));
  fis.close();
 }


 /**
  * 返回sheet表数目
  * 
  * @return int
  */
 public int getSheetCount() {
  int sheetCount = -1;
  sheetCount = wb.getNumberOfSheets();
  return sheetCount;
 }


 /**
  * sheetNum下的记录行数
  * 
  * @return int
  */
 public int getRowCount() {
  if (wb == null)
   System.out.println("=============>WorkBook为空");
  HSSFSheet sheet = wb.getSheetAt(this.sheetNum);
  int rowCount = -1;
  rowCount = sheet.getLastRowNum();
  return rowCount;
 }


 /**
  * 读取指定sheetNum的rowCount
  * 
  * @param sheetNum
  * @return int
  */
 public int getRowCount(int sheetNum) {
  HSSFSheet sheet = wb.getSheetAt(sheetNum);
  int rowCount = -1;
  rowCount = sheet.getLastRowNum();
  return rowCount;
 }


 /**
  * 得到指定行的内容
  * 
  * @param lineNum
  * @return String[]
  */
 public String[] readExcelLine(int lineNum) {
  return readExcelLine(this.sheetNum, lineNum);
 }


 /**
  * 指定工作表和行数的内容
  * 
  * @param sheetNum
  * @param lineNum
  * @return String[]
  */
 public String[] readExcelLine(int sheetNum, int lineNum) {
  if (sheetNum < 0 || lineNum < 0)
   return null;
  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;
 }


 /**
  * 读取指定列的内容
  * 
  * @param cellNum
  * @return String
  */
 public String readStringExcelCell(int cellNum) {
  return readStringExcelCell(this.rowNum, cellNum);
 }


 /**
  * 指定行和列编号的内容
  * 
  * @param rowNum
  * @param cellNum
  * @return String
  */
 public String readStringExcelCell(int rowNum, int cellNum) {
  return readStringExcelCell(this.sheetNum, rowNum, cellNum);
 }


 /**
  * 指定工作表、行、列下的内容
  * 
  * @param sheetNum
  * @param rowNum
  * @param cellNum
  * @return String
  */
 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((short) cellNum) != null) { // add this condition
    // judge
    switch (row.getCell((short) cellNum).getCellType()) {
    case HSSFCell.CELL_TYPE_FORMULA:
     strExcelCell = "FORMULA ";
     break;
    case HSSFCell.CELL_TYPE_NUMERIC: {
     strExcelCell = String.valueOf(row.getCell((short) cellNum)
       .getNumericCellValue());
    }
     break;
    case HSSFCell.CELL_TYPE_STRING:
     strExcelCell = row.getCell((short) cellNum)
       .getStringCellValue();
     break;
    case HSSFCell.CELL_TYPE_BLANK:
     strExcelCell = "";
     break;
    default:
     strExcelCell = "";
     break;
    }
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
  return strExcelCell;
 }
 //主函数用于测试
 public static void main(String args[]) {
  File file = new File("C:\\行业职业分类.xls");
  ExcelReader readExcel = new ExcelReader(file);
  try {
   readExcel.open();
  } catch (IOException e) {
   e.printStackTrace();
  }
  readExcel.setSheetNum(0); // 设置读取索引为0的工作表
  // 总行数
  int count = readExcel.getRowCount();
  for (int i = 0; i <= count; i++) {
   String[] rows = readExcel.readExcelLine(i);
   for (int j = 0; j < rows.length; j++) {
    System.out.print(rows[j] + " ");
   }
   System.out.print("\n");
  }
 }
}