package rw_excel;

import static org.junit.Assert.*;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.apache.poi.hssf.extractor.ExcelExtractor;
import org.apache.poi.ss.usermodel.Cell;
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.ss.usermodel.WorkbookFactory;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class test_poi {

    @BeforeClass
    public static void setUpBeforeClass() throws Exception {
    }

    @AfterClass
    public static void tearDownAfterClass() throws Exception {
    }

    @Test 
    public void test() throws IOException {
//        fail("Not yet implemented");
        String file_dir = "test.xlsx";
        Workbook book = null;
        book = getExcelWorkbook(file_dir);
        Sheet sheet = getSheetByNum(book,0);
        
        int lastRowNum = sheet.getLastRowNum();
        
        System.out.println("last number is "+ lastRowNum);
        
        for(int i = 0 ; i <= lastRowNum ; i++){
            Row row = null;
            row = sheet.getRow(i);
            if( row != null ){
                System.out.println("reading line is " + i);
                int lastCellNum = row.getLastCellNum();
                System.out.println("lastCellNum is " + lastCellNum );
                Cell cell = null;
                
                for( int j = 0 ; j <= lastCellNum ; j++ ){
                    cell = row.getCell(j);
                    if( cell != null ){
                        String cellValue = cell.getStringCellValue();
                        System.out.println("cell value is \n" + cellValue);
                    }
                }
            }
        }
        
    }

    public static Sheet getSheetByNum(Workbook book,int number){  
        Sheet sheet = null;  
        try {  
            sheet = book.getSheetAt(number);  
//          if(sheet == null){  
//              sheet = book.createSheet("Sheet"+number);  
//          }  
        } catch (Exception e) {  
            throw new RuntimeException(e.getMessage());  
        }  
        return sheet;  
    }  
    public static Workbook getExcelWorkbook(String filePath) throws IOException{  
        Workbook book = null;  
        File file  = null;  
        FileInputStream fis = null;   
          
        try {  
            file = new File(filePath);  
            if(!file.exists()){  
                throw new RuntimeException("文件不存在");  
            }else{  
                fis = new FileInputStream(file);  
                book = WorkbookFactory.create(fis); 
            }  
        } catch (Exception e) {  
            throw new RuntimeException(e.getMessage());  
        } finally {  
            if(fis != null){  
                fis.close();  
            }  
        }  
        return book;  
    } 
//    
}