JAVA解析Excel方式二：利用POI的事件驱动模型解析excel内容，强大。

1.解析类

public class ProcessExcelUtil {
    /**
     * 解析每个sheet页数据
     *
     * @param styles
     * @param strings
     * @param sheetInputStream
     * @param saxSheetContentsHandler
     * @throws Exception
     */
    private static void processSheet(StylesTable styles, ReadOnlySharedStringsTable strings, InputStream sheetInputStream, SaxSheetContentsHandler saxSheetContentsHandler)
            throws Exception {
        try {
            XMLReader sheetParser = SAXHelper.newXMLReader();
            sheetParser.setContentHandler(new XSSFSheetXMLHandler(styles, strings, saxSheetContentsHandler, false));
            sheetParser.parse(new InputSource(sheetInputStream));
        } catch (Exception e) {
            throw e;
        } finally {
            if (Objects.nonNull(sheetInputStream)) {
                sheetInputStream.close();
            }
        }
    }

    public static void main(String[] args) throws Exception {
        Map<Integer, List<Map<String, String>>> dataMap = new HashMap<>();
        OPCPackage pkg = null;
        InputStream in = new FileInputStream("E:\\test.xlsx");
        pkg = OPCPackage.open(in);
        XSSFReader xssfReader = new XSSFReader(pkg);
        StylesTable styles = xssfReader.getStylesTable();
        ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(pkg);
        Iterator<InputStream> iterators = xssfReader.getSheetsData();
        int sheetCount = 1;
        while (iterators.hasNext()) {
            List<Map<String, String>> dataListMap = new ArrayList<>();
            SaxSheetContentsHandler sheetHandler = new SaxSheetContentsHandler(dataListMap, 0, 0, -1);
            processSheet(styles, strings, iterators.next(), sheetHandler);
            dataMap.put(Integer.valueOf(sheetCount), dataListMap);
            sheetCount = sheetCount + 1;
        }
        for(Map.Entry<Integer,List<Map<String,String>>> map :dataMap.entrySet()){  //迭代每个sheet
            List<Map<String,String>> titleRow=map.getValue();
            for(Map<String,String> cellMap :titleRow){  //迭代sheet的每行数据，cellMap是每行数据
                //cellMap保存的是Excel每行的键值对例如{"列名"：值}：{"A": value，"B": value}
                System.out.println(cellMap.entrySet());
            }
        }
    }
}
2.自定义SAX装载工类

@Data
public class SaxSheetContentsHandler implements XSSFSheetXMLHandler.SheetContentsHandler {
    Logger logger= LoggerFactory.getLogger(SaxSheetContentsHandler.class);
    //数据单元
    private Map<String,String> cellMap=new HashMap<>();
    //数据记录，按行记录
    private List<Map<String,String>> cellDataListMap;
    //解析开始行
    private int startRow=0;
    //解析开始列
    private int startCol=0;
    //当前列
    private int currentCol=0;
    //读取数据行(默认为-1不做限制)
    private int limit=-1;

    /**
     * 构造器
     * @param cellDataListMap
     * @param startRow
     * @param startCol
     */
    public SaxSheetContentsHandler(List<Map<String,String>> cellDataListMap, int startRow, int startCol,int limit){
        this.cellDataListMap=cellDataListMap;
        this.startCol=startCol;
        this.startRow=startRow;
        this.limit=limit;
    }

    @Override
    public void startRow(int rowNum) {
        if(limit==-1){
            if(rowNum<startRow){
                return;
            }
        }else {
            if(rowNum<startRow || rowNum>limit){
                return;
            }
        }
        cellMap.clear();
    }

    @Override
    public void endRow(int rowNum) {
        if(limit==-1){
            if(rowNum<startRow){

                return;
            }
        }else if(rowNum<startRow || rowNum>limit) {  //用来判断从第几行开始读取，如果当前行小于开始行则需终止程序。
            currentCol=0;
            return;
        }
        if(!cellMap.isEmpty()){
            Map<String,String>  rowMap = null;
            try {
                rowMap = (Map<String, String>) CloneUtils.clone(cellMap);
                cellDataListMap.add(rowMap);
            } catch (CloneNotSupportedException e) {
                e.printStackTrace();
            }
        }
        currentCol=0;
    }

    /**
     *
     * @param cellReference 列名   例如A,B,C等
     * @param formattedValue 单元格值 对应每个单元格的值, [^A-Za-z]:匹配所有非字母的都用""
     * 代替,因为多行Excel的列明是：A1，B1，C1，....D10等，匹配替换后每行的列名就是A,B,C等。
     * 此方法用解析每一个cell的值
     * @param comment
     */
    @Override
    public void cell(String cellReference, String formattedValue, XSSFComment comment) {
        currentCol=currentCol+1;
        if(currentCol>=startCol){
            cellMap.put( cellReference.replaceAll("[^A-Za-z]",""),formattedValue);
        }
        return;

    }

    @Override
    public void headerFooter(String text, boolean isHeader, String tagName) {
        logger.debug("text: {},isHeader: {},tagName : {}",text,isHeader,tagName);
    }
}