poi读取excel需要做哪些操作

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package com.scpii.ent.util;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
 
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.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
import com.scpii.ent.mode.bean.DataSet;
 
public class ExcelOperClass {
    private static String EXCEL_2003 = ".xls";
    private static String EXCEL_2007 = ".xlsx";
 
    public static void readExcelJXL() {
 
    }
 
    /**
     * 通过POI方式读取Excel
     * 
     * @param excelFile
     */
    public static DataSet readExcelPOI(String filePath, Integer cons) throws Exception {
        File excelFile = new File(filePath);
        if (excelFile != null) {
            String fileName = excelFile.getName();
            fileName = fileName.toLowerCase();
            if (fileName.toLowerCase().endsWith(EXCEL_2003)) {
                DataSet dataSet = readExcelPOI2003(excelFile, cons);
                return dataSet;
            }
            if (fileName.toLowerCase().endsWith(EXCEL_2007)) {
                DataSet dataSet = readExcelPOI2007(excelFile, cons);
                return dataSet;
            }
        }
        return null;
    }
 
    /**
     * 读取Excel2003的表单
     * 
     * @param excelFile
     * @return
     * @throws Exception
     */
    private static DataSet readExcelPOI2003(File excelFile, Integer rCons)
            throws Exception {
        List<String[]> datasList = new ArrayList<String[]>();
        Set<String> colsSet = new HashSet<String>();
        InputStream input = new FileInputStream(excelFile);
        HSSFWorkbook workBook = new HSSFWorkbook(input);
        // 获取Excel的sheet数量
        Integer sheetNum = workBook.getNumberOfSheets();
        // 循环Sheet表单
        for (int i = 0; i < sheetNum; i++) {
            HSSFSheet sheet = workBook.getSheetAt(i);
            if (sheet == null) {
                continue;
            }
            // 获取Sheet里面的Row数量
            Integer rowNum = sheet.getLastRowNum() + 1;
            for (int j = 0; j < rowNum; j++) {
                 if (j>rCons) {
                    System.out.println("===========");
                    HSSFRow row = sheet.getRow(j);
                    if (row == null) {
                        continue;
                    }
 
                    Integer cellNum = row.getLastCellNum() + 1;
                    String[] datas = new String[cellNum];
                    for (int k = 0; k < cellNum; k++) {
                        HSSFCell cell = row.getCell(k);
                        if (cell == null) {
                            continue;
                        }
                        if (cell != null) {
                            cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                            String cellValue = "";
                            int cellValueType = cell.getCellType();
                            if (cellValueType == cell.CELL_TYPE_STRING) {
                                cellValue = cell.getStringCellValue();
                            }
                            if (cellValueType == cell.CELL_TYPE_NUMERIC) {
                                Double number = cell.getNumericCellValue();
                                 
                                System.out.println("字符串+++=========="+number.intValue());
                                cellValue = cell.getNumericCellValue() + "";
                            }
 
                            if (rCons==k) {
                                colsSet.add(cellValue);
                            }
 
                            System.out.println(cellValue);
                            datas[k] = cellValue;
                        }
                    }
                    datasList.add(datas);
                }
            }
        }
        DataSet dataSet = new DataSet(null, null, datasList, colsSet);
        return dataSet;
    }
 
    /**
     * 读取Excel2007的表单
     * 
     * @param excelFile
     * @return
     * @throws Exception
     */
    private static DataSet readExcelPOI2007(File excelFile, Integer rCons) throws Exception {
        List<String[]> datasList = new ArrayList<String[]>();
        Set<String> cosSet = new HashSet<String>();
        InputStream input = new FileInputStream(excelFile);
        XSSFWorkbook workBook = new XSSFWorkbook(input);
        // 获取Sheet数量
        Integer sheetNum = workBook.getNumberOfSheets();
        for (int i = 0; i < sheetNum; i++) {
            XSSFSheet sheet = workBook.getSheetAt(i);
            if (sheet == null) {
                continue;
            }
            // 获取行值
            Integer rowNum = sheet.getLastRowNum() + 1;
            for (int j = 0; j < rowNum; j++) {
                if (j > rCons) {
                    System.out.println("=============");
                    XSSFRow row = sheet.getRow(j);
                    if (row == null) {
                        continue;
                    }
                    Integer cellNum = row.getLastCellNum() + 1;
                    String[] datas = new String[cellNum];
                    for (int k = 0; k < cellNum; k++) {
                        XSSFCell cell = row.getCell(k);
                        if (cell==null) {
                            continue;
                        }
                        if (cell != null) {
                            cell.setCellType(XSSFCell.CELL_TYPE_STRING);
                            String cellValue = "";
                            int cellValueType = cell.getCellType();
                            if (cellValueType == cell.CELL_TYPE_STRING) {
                                cellValue = cell.getStringCellValue();
                            }
                            if (cellValueType == cell.CELL_TYPE_NUMERIC) {
                                Double number = cell.getNumericCellValue();
                                System.out.println("字符串+++=========="+number.toString());
                                cellValue = cell.getNumericCellValue() + "";
                            }
                            System.out.println(cellValue);
                            if (rCons == k) {
                                cosSet.add(cellValue);
                            }
                            datas[k] = cellValue;
                        }
                    }
                    datasList.add(datas);
                }
            }
        }
        DataSet dataSet = new DataSet(null, null, datasList,cosSet);
        return dataSet;
    }
 
    public static void main(String[] args) {
        try {
            DataSet dataSet = readExcelPOI("D:\\部门员工资料.xls", 0);
            System.out.println("================================");
            Set<String> datas = dataSet.getConStrctSet();
            String[] datastr = new String[datas.size()];
            datastr = datas.toArray(datastr);
            for (int i = 0; i < datastr.length; i++) {
                System.out.println(datastr[i]);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}