poi import indeterminate table in java, read data

Effect:

code

package com.wangyun.util;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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.XSSFWorkbook;


/**
 * @ClassName:       excel导入工具类
 * @Description:    
 * @author:  wangyun
 * @date: 2018-3-20     上午10:27:52
 */
public class ImportExcelUtil {
    private Workbook wb;
    private Sheet sheet;
    private Row row;


    public ImportExcelUtil(String filepath) {     if(filepath==null){     return;     }     String ext = filepath.substring(filepath.lastIndexOf("."));//获取文件名后缀     try { InputStream is = new FileInputStream(filepath); if(".xls".equals(ext)){//2003- 版本的excel wb = new HSSFWorkbook(is); }else if(".xlsx".equals(ext)){//2007+ 版本的excel wb = new XSSFWorkbook(is); }else{ wb=null; } } catch ( FileNotFoundException e) {














// TODO Auto-generated catch block
e.printStackTrace();
}catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
    }
    /**
     * 读取excel表头的内容
     * @return
     * @throws Exception
     */
    public String[] readExcelTitle() throws Exception{
    if(wb==null){
    throw new Exception("Workbook对象为空！");
    }
    sheet = wb.getSheetAt(0);
    row = sheet.getRow(0); // 标题总列数 int colNum = row.getPhysicalNumberOfCells(); System.out.println("colNum:" + colNum); String[] title = new String[colNum];
   
   
   
   
   
    for (int i = 0; i < colNum; i++) {
    // title[i] = getStringCellValue(row.getCell((short) i));
    row.getCell(i).setCellType(Cell.CELL_TYPE_STRING); 
    title[i] = row.getCell(i).getStringCellValue();
    }
    return title;
    }
    /**
     * 读取excel内容
     * @return
     * @throws Exception
     */
    public Map<Integer, Map<String,Object>> readExcelContent() throws Exception{
    if(wb==null){
    throw new Exception("Workbook对象为空！");
    }
    Map<Integer, Map<String,Object>> content = new HashMap<Integer, Map<String,Object>>();
    sheet = wb.getSheetAt(0);
    // 得到总行数
    int rowNum = sheet.getLastRowNum();
    row = sheet.getRow(0);
    int colNum = row.getPhysicalNumberOfCells();
    // The body content should start from the second row, the first row is the title of the header
    for (int i = 1; i <= rowNum; i++) {
    row = sheet.getRow(i);
    int j = 0;
    Map<String,Object> cellValue = new HashMap<String, Object>();
    while (j < colNum) {
    Object obj = getCellFormatValue(row.getCell(j));
    Object objStr=getCellFormatValue(sheet.getRow(0).getCell(j));
    //Get the title of the first column
    cellValue.put((String) objStr, obj);
    j++;
    }
    content.put(i, cellValue);
    }
    return content;     }     /**      * Set data parameters according to cell type      * @param cell
   




     * @return
     */
    private Object getCellFormatValue(Cell cell) {
    Object cellvalue = "";
    if (cell != null) {
    // Determine the Type
    switch of the current Cell (cell.getCellType()) {
    case Cell.CELL_TYPE_NUMERIC:// If the Type of the current Cell is NUMERIC
    case Cell.CELL_TYPE_FORMULA: {
    // Determine whether the current cell is a Date
    if (DateUtil.isCellDateFormatted(cell)) {
    // If it is a Date type, convert it to Data format
    // The data format is with Hours, minutes and seconds: 2013-7-10 0:00:00
    // cellvalue = cell.getDateCellValue().toLocaleString();
    // data format is without hours, minutes and seconds: 2013-7-10
    Date date = cell. getDateCellValue();
    cellvalue = date;
    } else {// If it is a pure number


    // Get the value of the current Cell
    cellvalue = String.valueOf(cell.getNumericCellValue());
    }
    break;
    }
    case Cell.CELL_TYPE_STRING:// If the Type of the current Cell is STRING
    // Get the current Cell string
    cellvalue = cell.getRichStringCellValue().getString() ;
    break;
    default:// default Cell value
    cellvalue = "";
    }
    } else {
    cellvalue = "";
    }
    return cellvalue;     }     public static void main(String[] args) { String filepath = "C:\\Users \\wangyun\\Desktop\\County and city data 2014.xls"; ImportExcelUtil eu=new ImportExcelUtil(filepath); String[] title; try { title = eu.readExcelTitle(); /*
   

    

   
   
   


System.out.println("Get the title of the Excel table:"); for (String s : title) { System.out.print(s + " "); }*/ // Test for reading the contents of the Excel table Map< Integer, Map<String,Object>> map = eu.readExcelContent(); System.out.println("Get the content of the Excel table:"); for (int i = 0; i <= map.size(); i++ ) { System.out.println(map.get(i)); } } catch (FileNotFoundException e) { System.out.println("The file at the specified path was not found!"); e.printStackTrace(); }catch ( Exception e) { e.printStackTrace(); }     } }