code: package com.hrLDA.doc;
  
  import org.apache.poi.xssf.usermodel.XSSFRow;
  import org.apache.poi.xssf.usermodel.XSSFSheet;
  import org.apache.poi.xssf.usermodel.XSSFWorkbook;
  
  public class StripXLSXContent extends Document{
  	public StripXLSXContent(){}
  	
    
      
      /**
       * 
       * @param .xlsx filepath
       * @return text content
       * @throws Exception
       */
      public StripXLSXContent readContent(String filepath){    	
      	
      	try{
      		StringBuffer stringBuffer = new StringBuffer();
              @SuppressWarnings("deprecation")
  			XSSFWorkbook xwb = new XSSFWorkbook(filepath);
  
              XSSFSheet sheet = xwb.getSheetAt(0);
              // define row, cell
              XSSFRow row;
              String cell;
             
              for (int i = sheet.getFirstRowNum(); i < sheet.getLastRowNum(); i++) {
                  row = sheet.getRow(i);
                  for (int j = row.getFirstCellNum(); j < row.getLastCellNum(); j++) {
                  	if (row.getCell(j) != null){
                  		cell = row.getCell(j).toString();
                  		// append the text when it contains English letters
                  		if (cell.matches("[\\p{L}_\\s]+") && !cell.matches("\\s+")){
                              stringBuffer.append(cell+"\n");               			
                  		}
                          	
                  	}
                  }
              }
  	        
  	        if (!stringBuffer.toString().matches("")){
  	            this.setCont(stringBuffer.toString());
  	            return this;
  	        }else return null;
  
  	    	} catch (Exception e) {
  				return null;
  		}
      } 
  	public static void main(String[] args) {
  		StripXLSXContent stripXLSXContent = new StripXLSXContent();
  		stripXLSXContent.readContent("/Users/xiaofengzhu/Documents/Intel/Materials/wikippts/Wiki0/testXlsx.xlsx");
  		System.out.println(stripXLSXContent.getCont());
  
  	}
  
  }
  