java从Excel2007中提取数据

Author: kagula

Initial Date: 2016-8-2

Last Update Date: 2017-06-16

Environment:

maven  eclipse mars.2   jdk1.8

Introduce:

    How to extract the specified column data by title name  from the excel 2003/2007 file demo.

   the excel file first row is header for distinguish column, after that is body will be extract.

 

Content:

Part1: Maven

    
	
	    org.apache.poi
    	poi
    	3.16
    
    
    
	
	    org.apache.poi
	    poi-ooxml
	    3.16
	

Part2: Source

package com.nuoke.escortcashbox.util;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.io.FilenameUtils;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.CellValue;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
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;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
public abstract class ExcelHelper {
	private static Logger logger = LoggerFactory.getLogger(ExcelHelper.class);
  
    private final static String XLS = "xls";  
    private final static String XLSX = "xlsx";  

    /*
     * file: a full path in the storage.
     * sheetNum: sheet index in the file, base is 0.
     * listKyes:  list key you want to extract from the excel file, must be in left to right order.
     */
    public static List> fromExcel2List(File file, 
    		int sheetNum, 
    		List listKeys)  
            throws IOException {  
        return fromExcel2List(new FileInputStream(file),  
                FilenameUtils.getExtension(file.getName()), sheetNum,listKeys);
    }  
    
    public static List> fromExcel2List(InputStream is,  
            String extensionName, int sheetNum, List listKeys) throws IOException {  
  
        Workbook workbook = null;  
  
        if (extensionName.toLowerCase().equals(XLS)) {  
            workbook = new HSSFWorkbook(is);  
        } else if (extensionName.toLowerCase().equals(XLSX)) {  
            workbook = new XSSFWorkbook(is);  
        }  
  
        return fromExcel2List(workbook, sheetNum,listKeys);  
    }  
  
    private static List> fromExcel2List(Workbook workbook,  
            int sheetNum, List listKeys) {  
  
        Sheet sheet = workbook.getSheetAt(sheetNum);  
  
        // 解析公式结果  
        FormulaEvaluator evaluator = workbook.getCreationHelper()  
                .createFormulaEvaluator();  
  
        List> list = new ArrayList>();
  
        int minRowIx = sheet.getFirstRowNum();  
        int maxRowIx = sheet.getLastRowNum();
        
        if( maxRowIx - minRowIx <= 0 )
        {
        	logger.warn("Rows is not enough!");
        	return null;
        }
        
        //Extract index in excel corresponding keys.
        Row rowHeader = sheet.getRow(minRowIx);
        Map mapSI = new HashMap();
        short minColIx = rowHeader.getFirstCellNum();  
        short maxColIx = rowHeader.getLastCellNum();
        for(int i=minColIx; i<=maxColIx; i++)
        {
        	Cell cell = rowHeader.getCell(new Integer(i));
        	CellValue cellValue = evaluator.evaluate(cell);
        	
            if (cellValue == null) {  
                continue;  
            }
            if(cellValue.getCellTypeEnum()!=CellType.STRING)
            	continue;            
            
            String t = cellValue.getStringValue().trim();
            mapSI.put(t, i);
        }
        
        //User must assure key order.
        List listKeyInIndex = new ArrayList(); 
        for(int i=0; i mapRow = new HashMap();
            List listRow = new ArrayList();
  
            minColIx = row.getFirstCellNum();  
            maxColIx = row.getLastCellNum();  
            for (int colIx = minColIx; colIx <= maxColIx; colIx++) {
                Cell cell = row.getCell(new Integer(colIx));  
                CellValue cellValue = evaluator.evaluate(cell);  
                if (cellValue == null) {  
                    continue;  
                }  
                // Here, only exist  Boolean、Numeric and String three types except Error type.  
                // Other types, According official site can be ignore http://poi.apache.org/spreadsheet/eval.html  
                switch (cellValue.getCellTypeEnum()) {  
                case BOOLEAN:
                	mapRow.put(colIx, cellValue.getBooleanValue()+"");  
                    break;  
                case NUMERIC:                 	
                    //data type will be convert to numeric type, so should be distinguish.
                	/*
                    if (DateUtil.isCellDateFormatted(cell)) {
                    	mapRow.put(colIx, cell.getDateCellValue()+"");  
                    } else {  
                        mapRow.put(colIx, cellValue.getNumberValue()+"");
                    }  
                    */
                	
                	//下面这行代码解决了“123”变成“123.0”问题。
                    mapRow.put(colIx, new BigDecimal(cell.getNumericCellValue()).toString());
                    
                    break;  
                case STRING:  
                	mapRow.put(colIx, cellValue.getStringValue());  
                    break;  
                case FORMULA:  
                    break;  
                case BLANK:  
                    break;  
                case ERROR:  
                    break;  
                default:  
                    break;  
                }//end case
            }//end for
            for(int i=0;i

Last Part: Test

	@Test
	public void TestParseExcelFile() throws IOException
	{
		String path = "C:\\Users\\kagula\\20160705.xls";
		List> list = null;
		List parameters = new ArrayList();
		parameters.add("地市");
		parameters.add("加油站");
		parameters.add("加油站（描述）");
	    list = ExcelHelper.fromExcel2List(new File(path), 0, parameters);  
	    for(int i=0;i

 

 

Reference

[1]《Java操作Excel文件导入》

http://snowolf.iteye.com/blog/1569252