我有一个摄取 .xlsx 文件的类。我从这个例子中获取它并根据我的需要进行了修改: https://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/xssf/eventusermodel/XLSX2CSV.java 现在，应用程序可以很好地处理某些文件，而其他文件则根本无法处理。如果我更改一个不工作的文件中的一个字段甚至字符并再次保存它们，则整个内容都会得到正确处理。有谁知道可能是什么原因(恕我直言，它位于原始 Excel 文件中的某个位置)。
对谁可能有帮助，这是我的代码:
package com.goodgamestudios.icosphere.service.fileReader;
import com.goodgamestudios.icosphere.datamodel.DataSet;
import com.goodgamestudios.icosphere.datamodel.Tuple;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.openxml4j.exceptions.OpenXML4JException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.ss.usermodel.BuiltinFormats;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.model.StylesTable;
import org.apache.poi.xssf.usermodel.XSSFCellStyle;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
public class ExcelFileReader implements FileReader {
static final Logger LOG = LoggerFactory.getLogger(ExcelFileReader.class);
private SheetHandler handler;
@Override
public DataSet getDataFromFile(File file) throws IOException {
LOG.info("Start ingesting file {}");
try {
OPCPackage pkg = OPCPackage.open(file);
XSSFReader reader = new XSSFReader(pkg);
StylesTable styles = reader.getStylesTable();
ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(pkg);
SharedStringsTable sst = reader.getSharedStringsTable();
XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
handler = new SheetHandler(styles, strings, 24);
parser.setContentHandler(handler);
// rId2 found by processing the Workbook
// Seems to either be rId# or rSheet#
System.out.println("yooooo 1");
InputStream sheet2 = reader.getSheet("rId2");
System.out.println("yooooo 2");
InputSource sheetSource = new InputSource(sheet2);
System.out.println("yooooo 3");
parser.parse(sheetSource);
LOG.debug("{} rows parsed", handler.getData().getRows().size() + 1);
sheet2.close();
return handler.getData();
} catch (OpenXML4JException | SAXException ex) {
LOG.warn("Unable to parse file {}", file.getName());
LOG.warn("Exception: {}: ", ex);
}
return null;
}
/**
* See org.xml.sax.helpers.DefaultHandler javadocs
*
* Derived from http://poi.apache.org/spreadsheet/how-to.html#xssf_sax_api
* <p/>
* Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at
* http://www.ecma-international.org/publications/standards/Ecma-376.htm
* <p/>
* A web-friendly version is http://openiso.org/Ecma/376/Part4
*/
private static class SheetHandler extends DefaultHandler {
boolean isFirstRow = true;
private int quantityOfColumns;
private int currentColumnNumber = 1;
int currentRowNumber = 1;
private int rowNumberOfLastCell = 1;
private DataSet data = new DataSet();
private Tuple tuple;
/**
* Table with styles
*/
private StylesTable stylesTable;
/**
* Table with unique strings
*/
private ReadOnlySharedStringsTable sharedStringsTable;
/**
* Number of columns to read starting with leftmost
*/
private final int minColumnCount;
// Set when V start element is seen
private boolean vIsOpen;
// Set when cell start element is seen;
// used when cell close element is seen.
private xssfDataType nextDataType;
// Used to format numeric cell values.
private short formatIndex;
private String formatString;
private final DataFormatter formatter;
// The last column printed to the output stream
private int lastColumnNumber = -1;
// Gathers characters as they are seen.
private StringBuffer value;
static final Logger LOG = LoggerFactory.getLogger(SheetHandler.class);
private SheetHandler(StylesTable styles,
ReadOnlySharedStringsTable strings,
int cols) {
this.stylesTable = styles;
this.sharedStringsTable = strings;
this.minColumnCount = cols;
this.value = new StringBuffer();
this.nextDataType = xssfDataType.NUMBER;
this.formatter = new DataFormatter();
LOG.debug("Sheethandler created");
}
/*
* (non-Javadoc)
* @see org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String, java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
System.out.println("yooooooooooo start:uri:" + uri + " localname: " + localName + " name: " + name);
if ("inlineStr".equals(name) || "v".equals(name)) {
vIsOpen = true;
// Clear contents cache
value.setLength(0);
} // c => cell
else if ("c".equals(name)) {
// Get the cell reference
String r = attributes.getValue("r");
int firstDigit = -1;
for (int c = 0; c < r.length(); ++c) {
if (Character.isDigit(r.charAt(c))) {
firstDigit = c;
break;
}
}
currentColumnNumber = nameToColumn(r.substring(0, firstDigit));
System.out.println("colu mn " + currentColumnNumber);
// Set up defaults.
this.nextDataType = xssfDataType.NUMBER;
this.formatIndex = -1;
this.formatString = null;
String cellType = attributes.getValue("t");
String cellStyleStr = attributes.getValue("s");
if ("b".equals(cellType)) {
nextDataType = xssfDataType.BOOL;
} else if ("e".equals(cellType)) {
nextDataType = xssfDataType.ERROR;
} else if ("inlineStr".equals(cellType)) {
nextDataType = xssfDataType.INLINESTR;
} else if ("s".equals(cellType)) {
nextDataType = xssfDataType.SSTINDEX;
} else if ("str".equals(cellType)) {
nextDataType = xssfDataType.FORMULA;
} else if (cellStyleStr != null) {
// It's a number, but almost certainly one
// with a special style or format
XSSFCellStyle style = null;
if (cellStyleStr != null) {
int styleIndex = Integer.parseInt(cellStyleStr);
style = stylesTable.getStyleAt(styleIndex);
} else if (stylesTable.getNumCellStyles() > 0) {
style = stylesTable.getStyleAt(0);
}
if (style != null) {
this.formatIndex = style.getDataFormat();
this.formatString = style.getDataFormatString();
if (this.formatString == null) {
this.formatString = BuiltinFormats.getBuiltinFormat(this.formatIndex);
}
}
}
}
}
/*
* (non-Javadoc)
* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String, java.lang.String, java.lang.String)
*/
public void endElement(String uri, String localName, String name)
throws SAXException {
String thisStr = null;
// v => contents of a cell
if ("v".equals(name)) {
// Process the value contents as required.
// Do now, as characters() may be called more than once
switch (nextDataType) {
case BOOL:
char first = value.charAt(0);
thisStr = first == '0' ? "FALSE" : "TRUE";
break;
case ERROR:
thisStr = "\"ERROR:" + value.toString() + '"';
break;
case FORMULA:
// A formula could result in a string value,
// so always add double-quote characters.
thisStr = '"' + value.toString() + '"';
break;
case INLINESTR:
// TODO: have seen an example of this, so it's untested.
XSSFRichTextString rtsi = new XSSFRichTextString(value.toString());
thisStr = '"' + rtsi.toString() + '"';
break;
case SSTINDEX:
String sstIndex = value.toString();
try {
int idx = Integer.parseInt(sstIndex);
XSSFRichTextString rtss = new XSSFRichTextString(sharedStringsTable.getEntryAt(idx));
thisStr = rtss.toString();
} catch (NumberFormatException ex) {
System.out.println("Failed to parse SST index '" + sstIndex + "': " + ex.toString());
}
break;
case NUMBER:
String n = value.toString();
if (this.formatString != null && n.length() > 0) {
thisStr = formatter.formatRawCellContents(Double.parseDouble(n), this.formatIndex, this.formatString);
} else {
thisStr = n;
}
break;
default:
thisStr = "(TODO: Unexpected type: " + nextDataType + ")";
break;
}
// Output after we've seen the string contents
// Emit commas for any fields that were missing on this row
if (lastColumnNumber == -1) {
lastColumnNumber = 0;
}
for (int i = lastColumnNumber; i < currentColumnNumber; ++i) {
}
// Might be the empty string.
System.out.println(thisStr);
if (isFirstRow) {
data.getHeaders().add(thisStr);
} else {
tuple.getRowEntries()[currentColumnNumber] = thisStr;
}
// Update column
if (currentColumnNumber > -1) {
lastColumnNumber = currentColumnNumber;
}
} else if ("row".equals(name)) {
// We're onto a new row
System.out.println("nextrow");
lastColumnNumber = -1;
System.out.println("yoooooo tuple:" + tuple);
if (isFirstRow) {
isFirstRow = false;
quantityOfColumns = data.getHeaders().size();
tuple = new Tuple(quantityOfColumns);
} else if (!tuple.isEmpty()) {
data.addRow(tuple);
tuple = new Tuple(quantityOfColumns);
}
}
}
/**
* Captures characters only if a suitable element is open. Originally
* was just "v"; extended for inlineStr also.
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
if (vIsOpen) {
value.append(ch, start, length);
}
}
/**
* Converts an Excel column name like "C" to a zero-based index.
*
* @param name
* @return Index corresponding to the specified name
*/
private int nameToColumn(String name) {
int column = -1;
for (int i = 0; i < name.length(); ++i) {
int c = name.charAt(i);
column = (column + 1) * 26 + c - 'A';
}
return column;
}
public DataSet getData() {
return data;
}
}
/**
* The type of the data value is indicated by an attribute on the cell. The
* value is usually in a "v" element within the cell.
*/
enum xssfDataType {
BOOL,
ERROR,
FORMULA,
INLINESTR,
SSTINDEX,
NUMBER,
}
}
以下是工作表和不工作工作表的 xml 示例:
http://www.file-upload.net/download-10909789/not_working.xml.html http://www.file-upload.net/download-10909790/working.xml.html
这里是 xlsx 文件:
http://www.file-upload.net/download-10909802/not_working.xlsx.html http://www.file-upload.net/download-10909803/working.xlsx.html
谢谢!
最佳答案
问题是，LibreOffice Calc 将第一个工作表保存在“rId2”下，而 MSOffice 将第一个工作表保存在“rId1”下。所以现在我正在遍历sheetIds，直到解析包含内容的工作表或找不到更多工作表。适用于这两个文件:
private void parseFirstWorksheetWithContent(XSSFReader reader) throws IOException, InvalidFormatException, SAXException {
//Sheet-ID seems to differ, seems to be "rId2" for files saved by MS Excel and "rId1" for those saved by LibreOffice Calc
try {
for (int i = 1; handler.getData().isEmpty(); i++) {
parseSheet(reader, "rId" + i);
}
} catch (IllegalArgumentException e) {
//No more sheets, file empty
}
}
private void parseSheet(XSSFReader reader, String sheetId) throws InvalidFormatException, SAXException, IOException {
XMLReader parser = XMLReaderFactory.createXMLReader("org.apache.xerces.parsers.SAXParser");
parser.setContentHandler(handler);
InputStream sheetStream = reader.getSheet(sheetId);
InputSource sheetSource = new InputSource(sheetStream);
parser.parse(sheetSource);
sheetStream.close();
}
关于java - Apache POI Streaming API 无法识别 Excel (xlsx) 内容，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32441898/