java导入excel

package cc.mrbird.common.util;

import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.RichTextString;
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.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelUtil2 {
    private final static String excel2003L = ".xls"; // 2003- 版本的excel
    private final static String excel2007U = ".xlsx"; // 2007+ 版本的excel

    /**
     * 将流中的Excel数据转成List<Map>
     * 
     * @param in
     *            输入流
     * @param fileName
     *            文件名（判断Excel版本）
     * @param mapping
     *            字段名称映射
     * @return
     * @throws Exception
     */
    public static List<Map<String, Object>> parseExcel(InputStream in, String fileName,
            Map<String, String> mapping) throws Exception {
        // 根据文件名来创建Excel工作薄
        Workbook work = getWorkbook(in, fileName);
        if (null == work) {
            throw new Exception("创建Excel工作薄为空！");
        }
        Sheet sheet = null;
        Row row = null;
        Cell cell = null;
        // 返回数据
        List<Map<String, Object>> ls = new ArrayList<Map<String, Object>>();

        // 遍历Excel中所有的sheet
        for (int i = 0; i < work.getNumberOfSheets(); i++) {
            sheet = work.getSheetAt(i);
            if (sheet == null)
                continue;

            // 取第一行标题
            row = sheet.getRow(0);
            String title[] = null;
            if (row != null) {
                title = new String[row.getLastCellNum()];

                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                    cell = row.getCell(y);
                    title[y] = (String) getCellValue(cell);
                }
            } else
                continue;
            //log.info(JSON.toJSONString(title));

            // 遍历当前sheet中的所有行
            for (int j = 1; j < sheet.getLastRowNum() + 1; j++) {
                row = sheet.getRow(j);
                Map<String, Object> m = new HashMap<String, Object>();
                // 遍历所有的列
                //System.out.println("行："+j);
                boolean flag = true;//判断当前格子是否没有任何数据
                for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                    cell = row.getCell(y);
                    if(cell==null){//格子是空的就创建一个，并填充空的富文本内容
                        row.createCell(y).setCellValue(getRichText("",fileName));
                        cell = row.getCell(y);
                    }
                    String key = title[y];
                    // log.info(JSON.toJSONString(key));
                    //System.out.println(title[y]+"		列："+y);
                    m.put(mapping.get(key), getCellValue(cell));
                    if(!"".equals(getCellValue(cell).toString())){
                        flag = false;
                    }
                }
                if(flag){
                     throw new Exception("当前表格中有空行，请删除后再重新导入！");
                }
                ls.add(m);
            }

        }
        work.close();
        return ls;
    }
    /**
     * 根据文件后缀，自适应创建富文本
     * @param inStr
     * @param fileName
     * @return
     * @throws Exception
     */
    public static RichTextString getRichText(String inStr,String fileName) throws Exception{
        RichTextString rs = null;
         String fileType = fileName.substring(fileName.lastIndexOf("."));
         if (excel2003L.equals(fileType)) {
             rs = new HSSFRichTextString(inStr); // 2003-
         } else if (excel2007U.equals(fileType)) {
             rs = new XSSFRichTextString(inStr); // 2007+
         } else {
             throw new Exception("请选择正确的excel文件！");
         }
         return rs;
    }
    /**
     * 描述：根据文件后缀，自适应上传文件的版本
     * 
     * @param inStr
     *            ,fileName
     * @return
     * @throws Exception
     */
    public static Workbook getWorkbook(InputStream inStr, String fileName) throws Exception {
        Workbook wb = null;
        String fileType = fileName.substring(fileName.lastIndexOf("."));
        if (excel2003L.equals(fileType)) {
            wb = new HSSFWorkbook(inStr); // 2003-
        } else if (excel2007U.equals(fileType)) {
            wb = new XSSFWorkbook(inStr); // 2007+
        } else {
            throw new Exception("请选择正确的excel文件！");
        }
        return wb;
    }

    /**
     * 描述：对表格中数值进行格式化
     * 
     * @param cell
     * @return
     */
    public static Object getCellValue(Cell cell) {
        Object value = null;
        DecimalFormat df = new DecimalFormat("0"); // 格式化number String字符
        SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd"); // 日期格式化
        DecimalFormat df2 = new DecimalFormat("0"); // 格式化数字
//        if(cell==null){
//            return null;
//        }
        switch (cell.getCellType()) {
        case Cell.CELL_TYPE_STRING:
            value = cell.getRichStringCellValue().getString();
            break;
        case Cell.CELL_TYPE_NUMERIC:
            if ("General".equals(cell.getCellStyle().getDataFormatString())) {
                value = df.format(cell.getNumericCellValue());
            } else if ("m/d/yy".equals(cell.getCellStyle().getDataFormatString())) {
                value = sdf.format(cell.getDateCellValue());
            } else {
                value = df2.format(cell.getNumericCellValue());
            }
            break;
        case Cell.CELL_TYPE_BOOLEAN:
            value = cell.getBooleanCellValue();
            break;
        case Cell.CELL_TYPE_BLANK:
            value = "";
            break;
        default:
            break;
        }
        return value;
    }

    public static void main(String[] args) throws Exception {   
        File file = new File("D:\2.xlsx");
        FileInputStream fis = new FileInputStream(file);
        Map<String, String> m = new HashMap<String, String>();
        m.put("IP","IP");
        m.put("Vlan","Vlan");
        m.put("Computer Name *","ComputerName");
        m.put("Mac Address *","MacAddress");
        m.put("Inventory No. *","InventoryNo");
        m.put("Type * 类型，是否PLC","Type");
        m.put("OS version * 系统版本","OSversion");
        m.put("Area*地点","Area");
        m.put("Machine Description设备描述","MachineDescription");
        m.put("Sepecial Softwares*特殊软件","SepecialSoftwares");
        m.put("Responsible*负责人","Responsible");
        m.put("Section部门","Section");
        m.put("Antivirus*是否安装防病毒","Antivirus");
        m.put("Patch updated*是否打补丁","PatchUpdated");
        m.put("Secure*是否安全","Secure");
        m.put("Block USB","BlockUSB");
        m.put("Block CD-ROM","BlockCD-ROM");
        m.put("A-SC 可用性","A-SC");
        m.put("C-SC 机密性","C-SC");
        m.put("I-SC 完整性","I-SC");
        m.put("Emergency Plan紧急恢复计划","EmergencyPlan");
        m.put("备注","Remark");

        List<Map<String, Object>> ls = parseExcel(fis, file.getName(), m);
        System.out.println(JSON.toJSONString(ls));
        for(int i=0;i<ls.size();i++){
            Map<String,Object> map = ls.get(i);
            map.get("IP");
            System.out.println(map.get("IP"));
        }
    }
}