简单好用-JAVA使用POI解析Excel

 相信使用POI的目前已经非常多了，我这边提供一个非常简单便利又通用的POI解析工具类，代码最后有示例代码。可以按照本文直接使用。

 

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

/**
 * 
 * Title: ExcelReader<br>
 * Description: 可以读取xls,xlsx等文件<br>
 * Copyright @ 2012~2016 xiaour.github.com .All rights reserved.<br>
 * @author  小鱼儿
 * @createDate 2016年8月23日
 * @version v1.0
 */
public class ExcelReader {
    private POIFSFileSystem fs;
    private HSSFWorkbook wb;
    private HSSFSheet sheet;
    private HSSFRow row;
	private static Logger logger = LogManager.getLogger(ExcelReader.class);

	private String fileFullPath;
	
	private int sheetNo;
	
	
	
    public ExcelReader(String fileFullPath, int sheetNo) {
		super();
		this.fileFullPath = fileFullPath;
		this.sheetNo = sheetNo;
	}

	/**
     * 读取Excel数据内容
     * @param InputStream 
     * @param sheetNo sheet 页号
     * @return Map 包含单元格数据内容的Map对象
     */
    public List<Map<String,Object>> readExcel() {
    	logger.info("开始解析xls...");
    	sheetNo--;//从1开始及从0开始
        InputStream is = null;
		try {
			is = new FileInputStream(fileFullPath);
		} catch (FileNotFoundException e1) {
			logger.error(e1);
		}
    	Map<String,Object> dataMap = null;
    	List<Map<String,Object>> dataList= new ArrayList<>();
    	String value = "";
    	 try {
             fs = new POIFSFileSystem(is);
             wb = new HSSFWorkbook(fs);
         } catch (IOException e) {
 			logger.error(e);
         }
         sheet = wb.getSheetAt(sheetNo);
         row = sheet.getRow(0);
         // 标题总列数
         int colNum = row.getPhysicalNumberOfCells();
         String[] keyArray = new String[colNum];
         for (int i = 0; i < colNum; i++) {
        	 keyArray[i] = getCellFormatValue(row.getCell((short) i));
         }
        int rowNum = sheet.getLastRowNum();
        // 正文内容应该从第二行开始,第一行为表头的标题
        for (int i = 2; i <= rowNum; i++) {
            dataMap= new HashMap<>();
            row = sheet.getRow(i);
            if(row!=null){
	            int j = 0;
	            while (j < colNum) {
	            	//这里把列循环到Map
	            	if(row.getCell((short) j)!=null){
	            	value = getCellFormatValue(row.getCell((short) j)).trim();
	            	dataMap.put(keyArray[j],value);
	            	}
	            	j++;
	            }
	            value = "";
	        	dataList.add(dataMap);
            }
        }
        logger.info("解析xls完成...");
        try {
        	if(is!=null)
			is.close();
		} catch (IOException e) {
			logger.error(e.toString());
		}
        return dataList;
    }

    /**
     * 根据HSSFCell类型设置数据
     * @param cell
     * @return
     */
    private String getCellFormatValue(HSSFCell cell) {
        String cellvalue = "";
        if (cell != null) {
            // 判断当前Cell的Type
            switch (cell.getCellType()) {
            // 如果当前Cell的Type为NUMERIC
            case HSSFCell.CELL_TYPE_NUMERIC:
            case HSSFCell.CELL_TYPE_FORMULA: {
                // 判断当前的cell是否为Date
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    Date date = cell.getDateCellValue();
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    cellvalue = sdf.format(date);
                }
                // 如果是纯数字
                else {
                    // 取得当前Cell的数值
                	DecimalFormat df = new DecimalFormat("0");  
                	String dfStr = df.format(cell.getNumericCellValue()); 
                    cellvalue = dfStr;
                }
                break;
            }
            // 如果当前Cell的Type为STRIN
            case HSSFCell.CELL_TYPE_STRING:
                // 取得当前的Cell字符串
                cellvalue = cell.getRichStringCellValue().getString();
                break;
            // 默认的Cell值
            default:
                cellvalue = " ";
            }
        } else {
            cellvalue = "";
        }
        return cellvalue;

    }

    public static void main(String[] args) {
        	List<Map<String, Object>> dataList;
            // 对读取Excel表格标题测试
            ExcelReader excelReader = new ExcelReader("D:\\okcoin-2016-08-3XZS.xls",1);
            dataList = excelReader.readExcel();
            for(Map<String,Object> theMap:dataList){
            	System.out.println(theMap);
            }
    }
}
 这个类导入相应的jar之后就可以用了，