EasyExcel的源码流程（导入Excel）

1. 入口

2.  EasyExcel类继承了EasyExcelFactory类，EasyExcel自动拥有EasyExcelFactory父类的所有方法，如read()，readSheet()，write()，writerSheet()等等。

3. 进入.read()方法，需要传入三个参数(文件路径，表头映射类，read监听器)
   首先调用new ExcelReaderBuilder()方法，初始化ReadWorkbook对象
   设置完readWorkbook属性后调，返回excelReaderBuilder对象 

4. 这里又个传入的参数是read监听器，进入其内部看一下，我们自定义了PersonListener实现了ReadListener。ReadListener接口源码 ：

自定义的PersonListener类：

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.aliyun.odps.jdbc.utils.LoggerFactory;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;

@Component
public class PersonListener extends AnalysisEventListener {
    //一行一行读出excel内容  不读表头  EasyExcel之所以效率高，也是因它一行一行读取，解析。
    @Override
    public void invoke(PersonTest personTest, AnalysisContext analysisContext) {
        System.out.println("***"+personTest);
    }
    //读取表头
    @Override
    public void invokeHeadMap(Map headMap, AnalysisContext context) {
        System.out.println("表头"+headMap);
    }
    //读取完执行的方法
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        System.out.println("读取全部后执行");
    }
}

5. 接下来调用的是.sheet()方法，这里我们会传入sheetNo、sheetName参数，调用build()方法创建ExcelReader对象，传入ExcelReaderSheetBuilder构造方法中，最终创ExcelReaderSheetBuilder对象 

6. 进入build()方法，build()方法生成了ExcelReader对象，初始化ExcelAnalyser，并实例化ExcelAnalyser。

在实例化ExcelAnalyser时，choiceExcelExecutor()方法通过excel格式使用不同的执行器。
我们看XLSX中，初始化了XlsxReadContext上下文对象，给到analysisContext，又初始化了XlsxSaxAnalyser解析器对象 

public class ExcelAnalyserImpl implements ExcelAnalyser {
    private static final Logger LOGGER = LoggerFactory.getLogger(ExcelAnalyserImpl.class);

    private AnalysisContext analysisContext;

    private ExcelReadExecutor excelReadExecutor;
    /**
     * Prevent multiple shutdowns
     */
    private boolean finished = false;

    public ExcelAnalyserImpl(ReadWorkbook readWorkbook) {
        try {
            choiceExcelExecutor(readWorkbook);
        } catch (RuntimeException e) {
            finish();
            throw e;
        } catch (Throwable e) {
            finish();
            throw new ExcelAnalysisException(e);
        }
    }

    private void choiceExcelExecutor(ReadWorkbook readWorkbook) throws Exception {
        ExcelTypeEnum excelType = ExcelTypeEnum.valueOf(readWorkbook);
        switch (excelType) {
            case XLS:
                POIFSFileSystem poifsFileSystem;
                if (readWorkbook.getFile() != null) {
                    poifsFileSystem = new POIFSFileSystem(readWorkbook.getFile());
                } else {
                    poifsFileSystem = new POIFSFileSystem(readWorkbook.getInputStream());
                }
                // So in encrypted excel, it looks like XLS but it's actually XLSX
                if (poifsFileSystem.getRoot().hasEntry(Decryptor.DEFAULT_POIFS_ENTRY)) {
                    InputStream decryptedStream = null;
                    try {
                        decryptedStream = DocumentFactoryHelper
                            .getDecryptedStream(poifsFileSystem.getRoot().getFileSystem(), readWorkbook.getPassword());
                        XlsxReadContext xlsxReadContext = new DefaultXlsxReadContext(readWorkbook, ExcelTypeEnum.XLSX);
                        analysisContext = xlsxReadContext;
                        excelReadExecutor = new XlsxSaxAnalyser(xlsxReadContext, decryptedStream);
                        return;
                    } finally {
                        IOUtils.closeQuietly(decryptedStream);
                        // as we processed the full stream already, we can close the filesystem here
                        // otherwise file handles are leaked
                        poifsFileSystem.close();
                    }
                }
                if (readWorkbook.getPassword() != null) {
                    Biff8EncryptionKey.setCurrentUserPassword(readWorkbook.getPassword());
                }
                XlsReadContext xlsReadContext = new DefaultXlsReadContext(readWorkbook, ExcelTypeEnum.XLS);
                xlsReadContext.xlsReadWorkbookHolder().setPoifsFileSystem(poifsFileSystem);
                analysisContext = xlsReadContext;
                excelReadExecutor = new XlsSaxAnalyser(xlsReadContext);
                break;
            case XLSX:
                XlsxReadContext xlsxReadContext = new DefaultXlsxReadContext(readWorkbook, ExcelTypeEnum.XLSX);
                analysisContext = xlsxReadContext;
                excelReadExecutor = new XlsxSaxAnalyser(xlsxReadContext, null);
                break;
            case CSV:
                CsvReadContext csvReadContext = new DefaultCsvReadContext(readWorkbook, ExcelTypeEnum.CSV);
                analysisContext = csvReadContext;
                excelReadExecutor = new CsvExcelReadExecutor(csvReadContext);
                break;
            default:
                break;
        }
    }
/*
----------------------------------------略---------------------------------------------
*/
}

7. XlsxSaxAnalyser详解

    7.1 进入new XlsxSaxAnalyser(xlsxReadContext, null)方法看一下,这里使用到SAX模式模式解析excel

public XlsxSaxAnalyser(XlsxReadContext xlsxReadContext, InputStream decryptedStream) throws Exception {
        this.xlsxReadContext = xlsxReadContext;
        // 初始化缓存（cache）
        XlsxReadWorkbookHolder xlsxReadWorkbookHolder = xlsxReadContext.xlsxReadWorkbookHolder();

        OPCPackage pkg = readOpcPackage(xlsxReadWorkbookHolder, decryptedStream);
        xlsxReadWorkbookHolder.setOpcPackage(pkg);

        // Read the Shared information Strings
        PackagePart sharedStringsTablePackagePart = pkg.getPart(SHARED_STRINGS_PART_NAME);
        if (sharedStringsTablePackagePart != null) {
            // 指定默认缓存
            defaultReadCache(xlsxReadWorkbookHolder, sharedStringsTablePackagePart);

            // 分析sharedStringsTable.xml，解析excel所有数据到readCache
            analysisSharedStringsTable(sharedStringsTablePackagePart.getInputStream(), xlsxReadWorkbookHolder);
        }

        XSSFReader xssfReader = new XSSFReader(pkg);
        analysisUse1904WindowDate(xssfReader, xlsxReadWorkbookHolder);

        // 设置样式表
        setStylesTable(xlsxReadWorkbookHolder, xssfReader);

        sheetList = new ArrayList<>();
        sheetMap = new HashMap<>();
        commentsTableMap = new HashMap<>();
        Map packageRelationshipCollectionMap = MapUtils.newHashMap();
        xlsxReadWorkbookHolder.setPackageRelationshipCollectionMap(packageRelationshipCollectionMap);

        // 获取所有sheet页
        XSSFReader.SheetIterator ite = (XSSFReader.SheetIterator)xssfReader.getSheetsData();
        int index = 0;
        if (!ite.hasNext()) {
            throw new ExcelAnalysisException("Can not find any sheet!");
        }
        // 遍历sheet页
        while (ite.hasNext()) {
            InputStream inputStream = ite.next();
            // 保存所有sheet页
            sheetList.add(new ReadSheet(index, ite.getSheetName()));
            // 保存所有sheet页的输入流
            sheetMap.put(index, inputStream);
            if (xlsxReadContext.readWorkbookHolder().getExtraReadSet().contains(CellExtraTypeEnum.COMMENT)) {
                CommentsTable commentsTable = ite.getSheetComments();
                if (null != commentsTable) {
                    commentsTableMap.put(index, commentsTable);
                }
            }
            if (xlsxReadContext.readWorkbookHolder().getExtraReadSet().contains(CellExtraTypeEnum.HYPERLINK)) {
                PackageRelationshipCollection packageRelationshipCollection = Optional.ofNullable(ite.getSheetPart())
                    .map(packagePart -> {
                        try {
                            return packagePart.getRelationships();
                        } catch (InvalidFormatException e) {
                            log.warn("Reading the Relationship failed", e);
                            return null;
                        }
                    }).orElse(null);
                if (packageRelationshipCollection != null) {
                    packageRelationshipCollectionMap.put(index, packageRelationshipCollection);
                }
            }
            index++;
        }
    }

    7.2 进入analysisSharedStringsTable方法，可以看到创建了一个SharedStringsTableHandler处理器

    7.3 再进入parseXmlSource看到xmlReader.setContentHandler(handler)这一行代码，设置了SharedStringsTableHandler处理器

private void parseXmlSource(InputStream inputStream, ContentHandler handler) {
        InputSource inputSource = new InputSource(inputStream);
        try {
            SAXParserFactory saxFactory;
            String xlsxSAXParserFactoryName = xlsxReadContext.xlsxReadWorkbookHolder().getSaxParserFactoryName();
            if (StringUtils.isEmpty(xlsxSAXParserFactoryName)) {
                saxFactory = SAXParserFactory.newInstance();
            } else {
                saxFactory = SAXParserFactory.newInstance(xlsxSAXParserFactoryName, null);
            }
            try {
                saxFactory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true);
            } catch (Throwable ignore) {}
            try {
                saxFactory.setFeature("http://xml.org/sax/features/external-general-entities", false);
            } catch (Throwable ignore) {}
            try {
                saxFactory.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
            } catch (Throwable ignore) {}
            SAXParser saxParser = saxFactory.newSAXParser();
            XMLReader xmlReader = saxParser.getXMLReader();
            xmlReader.setContentHandler(handler);
            xmlReader.parse(inputSource);
            inputStream.close();
        } catch (IOException | ParserConfigurationException | SAXException e) {
            throw new ExcelAnalysisException(e);
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    throw new ExcelAnalysisException("Can not close 'inputStream'!");
                }
            }
        }
    }

    7.4 我们将断点打在SharedStringsTableHandler里，发现下一步进入到这里面的startElement()    starteElement()后会调用endElement()

    7.5 反复调用，excel所有数据读取到readcache中

8. 调用.doRead()方法，开始SAX解析

    8.1 进入build()方法

    8.2 build()执行完后，执行read()方法，read()里还会进入一次read() 

9. 调用ExcelAnalyserImpl里的analysis()方法，设置sheetList，并调用执行器开始执行解析 

    9.1 调用的XlsxSaxAnalyser解析器execute()

 10. 进入parseXmlSource()方法，发现和之前的sax差不多，但只两次传入的handler类型不同，还是看一下传入的ContentHandler参数具体实现,进入XlsxRowHandler 内部

public class XlsxRowHandler extends DefaultHandler {
    private final XlsxReadContext xlsxReadContext;
    private static final Map XLSX_CELL_HANDLER_MAP = new HashMap(32);

    static {
        CellFormulaTagHandler cellFormulaTagHandler = new CellFormulaTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.CELL_FORMULA_TAG, cellFormulaTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_CELL_FORMULA_TAG, cellFormulaTagHandler);
        CellInlineStringValueTagHandler cellInlineStringValueTagHandler = new CellInlineStringValueTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.CELL_INLINE_STRING_VALUE_TAG, cellInlineStringValueTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_CELL_INLINE_STRING_VALUE_TAG, cellInlineStringValueTagHandler);
        CellTagHandler cellTagHandler = new CellTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.CELL_TAG, cellTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_CELL_TAG, cellTagHandler);
        CellValueTagHandler cellValueTagHandler = new CellValueTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.CELL_VALUE_TAG, cellValueTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_CELL_VALUE_TAG, cellValueTagHandler);
        CountTagHandler countTagHandler = new CountTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.DIMENSION_TAG, countTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_DIMENSION_TAG, countTagHandler);
        HyperlinkTagHandler hyperlinkTagHandler = new HyperlinkTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.HYPERLINK_TAG, hyperlinkTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_HYPERLINK_TAG, hyperlinkTagHandler);
        MergeCellTagHandler mergeCellTagHandler = new MergeCellTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.MERGE_CELL_TAG, mergeCellTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_MERGE_CELL_TAG, mergeCellTagHandler);
        RowTagHandler rowTagHandler = new RowTagHandler();
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.ROW_TAG, rowTagHandler);
        XLSX_CELL_HANDLER_MAP.put(ExcelXmlConstants.X_ROW_TAG, rowTagHandler);
    }

    public XlsxRowHandler(XlsxReadContext xlsxReadContext) {
        this.xlsxReadContext = xlsxReadContext;
    }

    @Override
    public void startElement(String uri, String localName, String name, Attributes attributes) throws SAXException {
        XlsxTagHandler handler = XLSX_CELL_HANDLER_MAP.get(name);
        if (handler == null || !handler.support(xlsxReadContext)) {
            return;
        }
        xlsxReadContext.xlsxReadSheetHolder().getTagDeque().push(name);
        handler.startElement(xlsxReadContext, name, attributes);
    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        String currentTag = xlsxReadContext.xlsxReadSheetHolder().getTagDeque().peek();
        if (currentTag == null) {
            return;
        }
        XlsxTagHandler handler = XLSX_CELL_HANDLER_MAP.get(currentTag);
        if (handler == null || !handler.support(xlsxReadContext)) {
            return;
        }
        handler.characters(xlsxReadContext, ch, start, length);
    }

    @Override
    public void endElement(String uri, String localName, String name) throws SAXException {
        XlsxTagHandler handler = XLSX_CELL_HANDLER_MAP.get(name);
        if (handler == null || !handler.support(xlsxReadContext)) {
            return;
        }
        handler.endElement(xlsxReadContext, name);
        xlsxReadContext.xlsxReadSheetHolder().getTagDeque().pop();
    }

}

    10.1 startElement()和endElement()都有多种实现

11. 进入用到的重要的几个类CellTagHandler、RowTagHandler

CellTagHandler: 读取cell的值，并放入tempCellData

public void startElement(XlsxReadContext xlsxReadContext, String name, Attributes attributes) {
        XlsxReadSheetHolder xlsxReadSheetHolder = xlsxReadContext.xlsxReadSheetHolder();
        xlsxReadSheetHolder.setColumnIndex(PositionUtils.getCol(attributes.getValue(ExcelXmlConstants.ATTRIBUTE_R),
            xlsxReadSheetHolder.getColumnIndex()));

        // t="s" ,it means String
        // t="str" ,it means String,but does not need to be read in the 'sharedStrings.xml'
        // t="inlineStr" ,it means String,but does not need to be read in the 'sharedStrings.xml'
        // t="b" ,it means Boolean
        // t="e" ,it means Error
        // t="n" ,it means Number
        // t is null ,it means Empty or Number
        CellDataTypeEnum type = CellDataTypeEnum.buildFromCellType(attributes.getValue(ExcelXmlConstants.ATTRIBUTE_T));
        xlsxReadSheetHolder.setTempCellData(new ReadCellData<>(type));
        xlsxReadSheetHolder.setTempData(new StringBuilder());

        // Put in data transformation information
        String dateFormatIndex = attributes.getValue(ExcelXmlConstants.ATTRIBUTE_S);
        int dateFormatIndexInteger;
        if (StringUtils.isEmpty(dateFormatIndex)) {
            dateFormatIndexInteger = DEFAULT_FORMAT_INDEX;
        } else {
            dateFormatIndexInteger = Integer.parseInt(dateFormatIndex);
        }

        xlsxReadSheetHolder.getTempCellData().setDataFormatData(
            xlsxReadContext.xlsxReadWorkbookHolder().dataFormatData(dateFormatIndexInteger));
    }

    @Override
    public void endElement(XlsxReadContext xlsxReadContext, String name) {
        XlsxReadSheetHolder xlsxReadSheetHolder = xlsxReadContext.xlsxReadSheetHolder();
        ReadCellData tempCellData = xlsxReadSheetHolder.getTempCellData();
        StringBuilder tempData = xlsxReadSheetHolder.getTempData();
        String tempDataString = tempData.toString();
        CellDataTypeEnum oldType = tempCellData.getType();
        switch (oldType) {
            case STRING:
                // In some cases, although cell type is a string, it may be an empty tag
                if (StringUtils.isEmpty(tempDataString)) {
                    break;
                }
                String stringValue = xlsxReadContext.readWorkbookHolder().getReadCache().get(
                    Integer.valueOf(tempDataString));
                tempCellData.setStringValue(stringValue);
                break;
            case DIRECT_STRING:
            case ERROR:
                tempCellData.setStringValue(tempDataString);
                tempCellData.setType(CellDataTypeEnum.STRING);
                break;
            case BOOLEAN:
                if (StringUtils.isEmpty(tempDataString)) {
                    tempCellData.setType(CellDataTypeEnum.EMPTY);
                    break;
                }
                tempCellData.setBooleanValue(BooleanUtils.valueOf(tempData.toString()));
                break;
            case NUMBER:
            case EMPTY:
                if (StringUtils.isEmpty(tempDataString)) {
                    tempCellData.setType(CellDataTypeEnum.EMPTY);
                    break;
                }
                tempCellData.setType(CellDataTypeEnum.NUMBER);
                tempCellData.setNumberValue(BigDecimal.valueOf(Double.parseDouble(tempDataString)));
                break;
            default:
                throw new IllegalStateException("Cannot set values now");
        }

        if (tempCellData.getStringValue() != null
            && xlsxReadContext.currentReadHolder().globalConfiguration().getAutoTrim()) {
            tempCellData.setStringValue(tempCellData.getStringValue().trim());
        }

        tempCellData.checkEmpty();
        tempCellData.setRowIndex(xlsxReadSheetHolder.getRowIndex());
        tempCellData.setColumnIndex(xlsxReadSheetHolder.getColumnIndex());
        xlsxReadSheetHolder.getCellMap().put(xlsxReadSheetHolder.getColumnIndex(), tempCellData);
    }

RowTagHandler: 当一行读取完毕后，调用分析事件处理器，处理一行数据

                            xlsxReadContext.analysisEventProcessor().endRow(xlsxReadContext);

public void startElement(XlsxReadContext xlsxReadContext, String name, Attributes attributes) {
        XlsxReadSheetHolder xlsxReadSheetHolder = xlsxReadContext.xlsxReadSheetHolder();
        int rowIndex = PositionUtils.getRowByRowTagt(attributes.getValue(ExcelXmlConstants.ATTRIBUTE_R),
            xlsxReadSheetHolder.getRowIndex());
        Integer lastRowIndex = xlsxReadContext.readSheetHolder().getRowIndex();
        while (lastRowIndex + 1 < rowIndex) {
            xlsxReadContext.readRowHolder(new ReadRowHolder(lastRowIndex + 1, RowTypeEnum.EMPTY,
                xlsxReadSheetHolder.getGlobalConfiguration(), new LinkedHashMap()));
            xlsxReadContext.analysisEventProcessor().endRow(xlsxReadContext);
            xlsxReadSheetHolder.setColumnIndex(null);
            xlsxReadSheetHolder.setCellMap(new LinkedHashMap());
            lastRowIndex++;
        }
        xlsxReadSheetHolder.setRowIndex(rowIndex);
    }

    @Override
    public void endElement(XlsxReadContext xlsxReadContext, String name) {
        XlsxReadSheetHolder xlsxReadSheetHolder = xlsxReadContext.xlsxReadSheetHolder();
        RowTypeEnum rowType = MapUtils.isEmpty(xlsxReadSheetHolder.getCellMap()) ? RowTypeEnum.EMPTY : RowTypeEnum.DATA;
        // It's possible that all of the cells in the row are empty
        if (rowType == RowTypeEnum.DATA) {
            boolean hasData = false;
            for (Cell cell : xlsxReadSheetHolder.getCellMap().values()) {
                if (!(cell instanceof ReadCellData)) {
                    hasData = true;
                    break;
                }
                ReadCellData readCellData = (ReadCellData)cell;
                if (readCellData.getType() != CellDataTypeEnum.EMPTY) {
                    hasData = true;
                    break;
                }
            }
            if (!hasData) {
                rowType = RowTypeEnum.EMPTY;
            }
        }
        xlsxReadContext.readRowHolder(new ReadRowHolder(xlsxReadSheetHolder.getRowIndex(), rowType,
            xlsxReadSheetHolder.getGlobalConfiguration(), xlsxReadSheetHolder.getCellMap()));
        xlsxReadContext.analysisEventProcessor().endRow(xlsxReadContext);
        xlsxReadSheetHolder.setColumnIndex(null);
        xlsxReadSheetHolder.setCellMap(new LinkedHashMap<>());
    }

12. 进入endRow()方法

13. 进入dealData()方法

private void dealData(AnalysisContext analysisContext) {
        ReadRowHolder readRowHolder = analysisContext.readRowHolder();
        Map> cellDataMap = (Map)readRowHolder.getCellMap();
        readRowHolder.setCurrentRowAnalysisResult(cellDataMap);
        int rowIndex = readRowHolder.getRowIndex();
        int currentHeadRowNumber = analysisContext.readSheetHolder().getHeadRowNumber();

        boolean isData = rowIndex >= currentHeadRowNumber;

        // Last head column
        if (!isData && currentHeadRowNumber == rowIndex + 1) {
            buildHead(analysisContext, cellDataMap);
        }
        // Now is data
        for (ReadListener readListener : analysisContext.currentReadHolder().readListenerList()) {
            try {
                if (isData) {
                    readListener.invoke(readRowHolder.getCurrentRowAnalysisResult(), analysisContext);
                } else {
                    readListener.invokeHead(cellDataMap, analysisContext);
                }
            } catch (Exception e) {
                onException(analysisContext, e);
                break;
            }
            if (!readListener.hasNext(analysisContext)) {
                throw new ExcelAnalysisStopException();
            }
        }
    }

14. 退回XlsxSaxAnalyser的解析器execute()方法

      进入readComments()方法,读取额外信息（批注、超链接、合并单元格信息读取）

	private void readComments(ReadSheet readSheet) {
        if (!xlsxReadContext.readWorkbookHolder().getExtraReadSet().contains(CellExtraTypeEnum.COMMENT)) {
            return;
        }
        CommentsTable commentsTable = commentsTableMap.get(readSheet.getSheetNo());
        if (commentsTable == null) {
            return;
        }
        Iterator cellAddresses = commentsTable.getCellAddresses();
        while (cellAddresses.hasNext()) {
            CellAddress cellAddress = cellAddresses.next();
            XSSFComment cellComment = commentsTable.findCellComment(cellAddress);
            CellExtra cellExtra = new CellExtra(CellExtraTypeEnum.COMMENT, cellComment.getString().toString(),
                cellAddress.getRow(), cellAddress.getColumn());
            xlsxReadContext.readSheetHolder().setCellExtra(cellExtra);
            xlsxReadContext.analysisEventProcessor().extra(xlsxReadContext);
        }
    }

15. 最后进入.endSheet(xlsxReadContext)方法

@Override
    public void endSheet(AnalysisContext analysisContext) {
    	// 这里会调用所有监听器中的doAfterAllAnalysed方法，执行最后的操作
        for (ReadListener readListener : analysisContext.currentReadHolder().readListenerList()) {
            readListener.doAfterAllAnalysed(analysisContext);
        }
    }

16. 在读取完毕之后，执行finish()方法，关闭所有流