java - 尝试使用 Java SAX 解析 excel xml 文件时出错

Question

我正在尝试解析 this tutorial. 中的 xml 数据但我不断收到错误。

Exception in thread "main" org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 40; Premature end of file.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at convert.ExcelXmlReader.getAndParseFile(ExcelXmlReader.java:60)
at convert.ExcelXmlReader.main(ExcelXmlReader.java:32)

我可以下载该文件，并且我编辑了他的代码，以便我可以格式化我的 xml。我的最终目标是将其导入 Access，但我在解析它时遇到了麻烦。

还在他们的代码中，他们使用了一些 exml 版本和编码，但我的 xml 文件已经有那个 () 所以我把它拿出来了。我不确定我还需要做什么。

 private static void getAndParseFile() throws Exception {
        System.out.println("getAndParseFile");
        String fileName="C:\\Users\\windowsUserName\\Downloads\\F7BAH1P2_List.xml";

        File file = new File(fileName);
        removeLineFromFile(file.getAbsolutePath());

        System.out.println("Finished Removing Lines");


        String fileContent = IOUtils.toString(new FileInputStream(file));
        SAXParserFactory parserFactor = SAXParserFactory.newInstance();
        SAXParser parser = parserFactor.newSAXParser();
        SAXHandler handler = new SAXHandler();

        ByteArrayInputStream bis = new ByteArrayInputStream(fileContent.getBytes());

        parser.parse(bis, handler); \\Apparently error happens here**

        Workbook workbook = new HSSFWorkbook();
        Sheet sheet = workbook.createSheet();

        //Converts all rows to POI rows 
        int rowCount = 0;
        for (XmlRow subsRow : handler.xmlRowList) {
            Row row = sheet.createRow(rowCount);
            int cellCount = 0;
            for (String cellValue : subsRow.cellList) {
                Cell cell = row.createCell(cellCount);
                cell.setCellValue(cellValue);
                cellCount++;
            }
            rowCount++;
        }

        String fileOutPath = "C:\\Users\\windowsUserName\\Downloads\\fileOut.xls";
        FileOutputStream fout = new FileOutputStream(fileOutPath);
        workbook.write(fout);
        workbook.close();
        fout.close();

        if (file.exists()) {
            System.out.println("delete file-> " + file.getAbsolutePath());
            if (!file.delete()) {
                System.out.println("file '" + file.getAbsolutePath() + "' was not deleted!");
            }
        }
        System.out.println("getAndParseFile finished, processed " + " substances!");
    }

他们的 SaxHandler.java 文件，我不知道如何编辑，但我认为它是正确的？我在 xml 文件中也看到了“行”和“数据”。

package convert;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.util.ArrayList;
import java.util.List;

class SAXHandler extends DefaultHandler {

    List<XmlRow> xmlRowList = new ArrayList<>();
    XmlRow xmlRow = null;
    String content = null;

    @Override
    //Finds start of Row
    public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
        if (qName.equalsIgnoreCase("row"))
                xmlRow = new XmlRow();
    }

    @Override
    //Finds end of Row tag
    public void endElement(String uri, String localName, String qName) throws SAXException {
        switch (qName) {
            case "Row": //if it's the </row>,
                xmlRowList.add(xmlRow);  //add this row in the rowlist?
                break;
            case "Data": //if it is </data>
                xmlRow.cellList.add(content); //
                break;
        }
    }

    @Override
    //Gets data between the tags.
    public void characters(char[] ch, int start, int length) throws SAXException {
        content = String.copyValueOf(ch, start, length).trim();
    }
}

Excel/Xml 文件:

<?xml version="1.0" encoding="utf-16"?>
<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
<Author>marc</Author>
<LastAuthor>ESDI</LastAuthor>
</DocumentProperties>
<ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
<WindowHeight>7560</WindowHeight>
<WindowWidth>12300</WindowWidth>
<WindowTopX>360</WindowTopX>
<WindowTopY>135</WindowTopY>
<ProtectStructure>False</ProtectStructure>
<ProtectWindows>False</ProtectWindows>
</ExcelWorkbook>
<Styles>
<Style ss:ID="Default" ss:Name="Normal">
<Alignment ss:Vertical="Bottom"/>
<Borders/>
<Font/>
<Interior/>
<NumberFormat/>
<Protection/>
</Style>
<Style ss:ID="s21">
<NumberFormat ss:Format="Short Date"/>
</Style>
</Styles>
<Worksheet ss:Name="Sheet1">
<Table x:FullColumns="1" x:FullRows="1">
<Row>
<Cell><Data ss:Type="String">Crt. Dte</Data></Cell>
<Cell><Data ss:Type="String">WR Status</Data></Cell>
<Cell><Data ss:Type="String">Request Plant</Data></Cell>
<Cell><Data ss:Type="String">Request #</Data></Cell>    
<Cell><Data ss:Type="String">Item#</Data></Cell>
<Cell><Data ss:Type="String">Request Cost Center</Data></Cell>
<Cell><Data ss:Type="String">WR Description</Data></Cell>
<Cell><Data ss:Type="String">W/O No</Data></Cell>
<Cell><Data ss:Type="String">Charge Plant</Data></Cell>
<Cell><Data ss:Type="String">Charge Cost Center</Data></Cell>
<Cell><Data ss:Type="String">Equip NO</Data></Cell>
<Cell><Data ss:Type="String">Equipment Name</Data></Cell>
<Cell><Data ss:Type="String">Required Date</Data></Cell>
<Cell><Data ss:Type="String">WO Type</Data></Cell>
<Cell><Data ss:Type="String">Exec. C/C</Data></Cell>
<Cell><Data ss:Type="String">Exec. Plant</Data></Cell>  
<Cell><Data ss:Type="String">Plant1</Data></Cell>
<Cell><Data ss:Type="String">Area</Data></Cell>
<Cell><Data ss:Type="String">Confirmed</Data></Cell>
<Cell><Data ss:Type="String">WO Status</Data></Cell>
<Cell><Data ss:Type="String">W/R Requester</Data></Cell>
</Row>
</Table>
<WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
<Selected/>
<ProtectObjects>False</ProtectObjects>
<ProtectScenarios>False</ProtectScenarios>
</WorksheetOptions>
</Worksheet>
</Workbook>

我正在查看其他答案，但他们都说只有当 xml 文件在该部分前面有某些内容时才会发生此错误。但我查了一下，那里什么也没有。除此之外，我删除了空格(制表符条目)，但错误仍然发生。

RemoveLineFromFile 是根据教程修改的。但基本上它会删除开头和结尾不包含数据的原始空行(开头 2 个，结尾 2 个)。它会检查它们是否已被删除。

private static void removeLineFromFile(String file) {

        BufferedReader br = null;
        PrintWriter pw = null;
        try {
            File inFile = new File(file);
            if (!inFile.isFile()) {
                return;
            }

            br = new BufferedReader(new FileReader(file));

            String line = null;
            int totalRows=0;
            boolean continueMethod = false;
            //Count total number of rows in file
            while ((line = br.readLine()) != null) {
                //check if file is already formatted
                if (line.contains("List for Work")){
                    continueMethod = true;
                }

                if (line.toLowerCase().contains("</row>")){
                        ++totalRows;
                    }
                }

            if (continueMethod)
            {
                //Create a temporary file to hold the file with deleted lines.
                File tempFile = new File(inFile.getAbsolutePath() + ".tmp");
                pw = new PrintWriter(new FileWriter(tempFile));

                line = null;
                br.close();
                br = null;
                br = new BufferedReader(new FileReader(file));
                boolean ignoreMe = false;
                int rowCounter = 0;
                int rowCloser = 0;
                //begin cycling through file and writing to new one.
                while((line = br.readLine()) != null)
                {
                    //if runs into a row, count it.
                    if (line.toLowerCase().contains("<row>")){
                        rowCounter++;
                    }
                    if (line.toLowerCase().contains("</row>")){
                        rowCloser++;
                    }
                    //Delete the first two, and last two lines
                    if ((rowCounter == 1 ) || (rowCounter == 2) || (rowCounter == (totalRows-1)) || (rowCounter == totalRows))
                    {
                        ignoreMe = true;
                        //If it reached the last closing tag, exit out of this to allow it to write the rest of the file.
                        if (rowCloser==totalRows)
                            rowCounter++;                   
                    }
                    else
                    {
                        ignoreMe = false;
                    }
                    //copy over other lines
                    if (!ignoreMe)
                    {
                        pw.println(line);
                        pw.flush();
                    }
                }   
                br.close();
                pw.close();
                //Delete the original file
                if (!inFile.delete()) {
                    System.out.println("Could not delete original file");
                    return;
                }

                //Rename the new file to the filename the original file had.
                if (!tempFile.renameTo(inFile))
                    System.out.println("Could not rename temp file");
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

使用RemoveLineFromFile之前的xml文件:

<?xml version="1.0" encoding="utf-16"?>
<?mso-application progid="Excel.Sheet"?>

<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:x="urn:schemas-microsoft-com:office:excel"
xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
xmlns:html="http://www.w3.org/TR/REC-html40">
<DocumentProperties xmlns="urn:schemas-microsoft-com:office:office">
<Author>marc</Author>
<LastAuthor>ESDI</LastAuthor>
</DocumentProperties>
<ExcelWorkbook xmlns="urn:schemas-microsoft-com:office:excel">
<WindowHeight>7560</WindowHeight>
<WindowWidth>12300</WindowWidth>
<WindowTopX>360</WindowTopX>
<WindowTopY>135</WindowTopY>
<ProtectStructure>False</ProtectStructure>
<ProtectWindows>False</ProtectWindows>
</ExcelWorkbook>
<Styles>
<Style ss:ID="Default" ss:Name="Normal">
<Alignment ss:Vertical="Bottom"/>
<Borders/>
<Font/>
<Interior/>
<NumberFormat/>
<Protection/>
</Style>
<Style ss:ID="s21">
<NumberFormat ss:Format="Short Date"/>
</Style>
</Styles>
<Worksheet ss:Name="Sheet1">
<Table x:FullColumns="1" x:FullRows="1">
<Row>
<Cell><Data ss:Type="String">List for Work Request(F7BAH1P)</Data></Cell>
</Row>
<Row>
</Row>
            <Row>
    <Cell><Data ss:Type="String">Crt. Dte</Data></Cell>
    <Cell><Data ss:Type="String">WR Status</Data></Cell>
    <Cell><Data ss:Type="String">Request Plant</Data></Cell>
    <Cell><Data ss:Type="String">Request #</Data></Cell>    
    <Cell><Data ss:Type="String">Item#</Data></Cell>
    <Cell><Data ss:Type="String">Request Cost Center</Data></Cell>
    <Cell><Data ss:Type="String">WR Description</Data></Cell>
    <Cell><Data ss:Type="String">W/O No</Data></Cell>
    <Cell><Data ss:Type="String">Charge Plant</Data></Cell>
    <Cell><Data ss:Type="String">Charge Cost Center</Data></Cell>
    <Cell><Data ss:Type="String">Equip NO</Data></Cell>
    <Cell><Data ss:Type="String">Equipment Name</Data></Cell>
    <Cell><Data ss:Type="String">Required Date</Data></Cell>
    <Cell><Data ss:Type="String">WO Type</Data></Cell>
    <Cell><Data ss:Type="String">Exec. C/C</Data></Cell>
    <Cell><Data ss:Type="String">Exec. Plant</Data></Cell>  
    <Cell><Data ss:Type="String">Plant1</Data></Cell>
    <Cell><Data ss:Type="String">Area</Data></Cell>
    <Cell><Data ss:Type="String">Confirmed</Data></Cell>
    <Cell><Data ss:Type="String">WO Status</Data></Cell>
    <Cell><Data ss:Type="String">W/R Requester</Data></Cell>

            </Row>






 <Row>
</Row>
<Row>
<Cell><Data ss:Type="String">Count: 244</Data></Cell>
</Row>
</Table>
<WorksheetOptions xmlns="urn:schemas-microsoft-com:office:excel">
<Selected/>
<ProtectObjects>False</ProtectObjects>
<ProtectScenarios>False</ProtectScenarios>
</WorksheetOptions>
</Worksheet>
</Workbook>

Answer 1

您似乎遇到了字符集转换问题。

用于读取文件的代码如下:

    String fileContent = IOUtils.toString(new FileInputStream(file));
    // SAX parser creation omitted.
    ByteArrayInputStream bis = new ByteArrayInputStream(fileContent.getBytes());

    parser.parse(bis, handler); //Apparently error happens here**

使用默认字符集将文件作为字符串读取，然后使用默认字符集再次将其转换回字节，然后将生成的字节数组输入流传递给 SAX 解析器。 XML 文件指定了 UTF-16 字符集，我猜测您的默认字符集不是 UTF-16，因此读取 UTF-16 文件就像使用其他字符集一样是错误的。

您可以尝试在对 IOUtils.toString() 和 fileContent.getBytes() 的调用中指定 UTF-16 字符集，但说实话，它是通过将 FileInputStream 直接传递给解析器，可以更简单地完全避免任何字符集问题:

    parser.parse(new FileInputStream(file), handler); 

我将让您自行修改代码，以确保 FileInputStream 在完成后立即关闭。