java 读取excel文件转换成json格式的实例代码

package com.siemens.util; 
import java.util.ArrayList; 
import java.util.List; 
import org.json.JSONException; 
import org.json.JSONObject; 
import org.apache.poi.ss.usermodel.Row; 
import org.apache.poi.ss.usermodel.Sheet; 
import org.apache.poi.ss.usermodel.Workbook; 
//import com.siemens.entity.master; 
//import com.siemens.service.masterService; 
//import com.siemens.serviceImpl.masterServiceImpl; 
//import com.siemens.serviceImpl.webServiceImpl; 
public class importFile { 
  public static void main(String[] args) throws JSONException{ 
//   master masters = new master(); 
//   ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); 
//   masterService ms = (masterService)ac.getBean("masterservice"); 
     Workbook wb =null; 
      Sheet sheet = null; 
      Row row = null; 
      String cellData = null; 
      //文件路径， 
      String filePath = "f:/haoxy/Worktable222.xls"; 
      wb =EXCELBean.readExcel(filePath); 
      if(wb != null){ 
        //用来存放表中数据 
        List listMap = new ArrayList(); 
        //获取第一个sheet 
        sheet = wb.getSheetAt(0); 
        //获取最大行数 
        int rownum = sheet.getPhysicalNumberOfRows(); 
        //获取第一行 
        row = sheet.getRow(0); 
        //获取最大列数 
        int colnum = row.getPhysicalNumberOfCells(); 
        //这里创建json对象，实测用map的话，json数据会有问题  
        JSONObject jsonMap = new JSONObject(); 
        //循环行 
        for (int i = 1; i < rownum; i++) { 
          row = sheet.getRow(i); 
          if(row !=null){ 
            //创建list对象接收读出的excel数据 
            List list = new ArrayList(); 
            //循环列 
            for (int j=0;j list3 = new ArrayList(); 
                  list3.add("non-empty-placeholder"); 
                  jsonObject2.put("children",list3); 
                } 
                listMap.add(jsonObject2);              
          }else{ 
            break; 
          }        
        }// end for row 
            //最外层加个key-gridData 
            jsonMap.put("gridData", listMap); 
            System.out.println(jsonMap);       
      }       
  }   
} 

package com.siemens.util; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
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.Workbook; 
import org.apache.poi.xssf.usermodel.XSSFWorkbook; 
public class EXCELBean { 
  //读取excel 
  public static Workbook readExcel(String filePath){ 
    Workbook wb = null; 
    if(filePath==null){ 
      return null; 
    } 
    String extString = filePath.substring(filePath.lastIndexOf(".")); 
    InputStream is = null; 
    try { 
      is = new FileInputStream(filePath); 
      if(".xls".equals(extString)){ 
        return wb = new HSSFWorkbook(is); 
      }else if(".xlsx".equals(extString)){ 
        return wb = new XSSFWorkbook(is); 
      }else{ 
        return wb = null; 
      } 
    } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return wb; 
  } 
  public static Object getCellFormatValue(Cell cell){ 
    Object cellValue = null; 
    if(cell!=null){ 
      //判断cell类型 
      switch(cell.getCellType()){ 
      case Cell.CELL_TYPE_NUMERIC:{ 
        cellValue = String.valueOf(cell.getNumericCellValue()); 
        break; 
      } 
      case Cell.CELL_TYPE_FORMULA:{ 
        //判断cell是否为日期格式 
        if(DateUtil.isCellDateFormatted(cell)){ 
          //转换为日期格式YYYY-mm-dd 
          cellValue = cell.getDateCellValue(); 
        }else{ 
          //数字 
          cellValue = String.valueOf(cell.getNumericCellValue()); 
        } 
        break; 
      } 
      case Cell.CELL_TYPE_STRING:{ 
        cellValue = cell.getRichStringCellValue().getString(); 
        break; 
      } 
      default: 
        cellValue = ""; 
      } 
    }else{ 
      cellValue = ""; 
    } 
    return cellValue; 
  } 
}