维护从XML到Excel文件的层次结构 – Java

我有一个包含嵌套记录的 XML文件.我必须从文件中获取记录并写入Excel文件.现在,我生成的文件是一个平面文件. (我使用Apache POI写入Excel文件).我需要它来维护分层信息,以便嵌套记录缩进.

我的XML文件看起来像：

<node>
    <id>123</id>
    <label>ABC</label>
    <node>
        <id>456</id>
        <label>DEF</label>
     ....... so on

我目前的Excel看起来像：

我需要类似的东西(表示XML文件中的层次结构)：

有没有人有这样的经历？我真的很感激帮助.

解决方法

如果您愿意测试Sax Parser,我可能会尝试一个解决方案.下面是我使用的类,它包含SAXParser的默认处理程序以及在将xml文件输入xlsx文件之前用于格式化xml文件的代码.它看起来有点沉重,所以我试图尽可能地添加评论,以使其易于理解.

public class SO2 {
        private SO2(File xml){
            wb = new XSSFWorkbook(); //Workbook to create
            sheet = wb.createSheet(); //Sheet to write to

                try {
                    SO2.retrieveSaxParser().parse(xml,SO2.retrieveHandler()); //Begin parse
                     Path file = Paths.get(System.getProperty("user.home"),"Desktop","XMLTest.xlsx"); //Where to write file
                     wb.write(new FileOutputStream(file.toString()));
                } catch (SAXException | IOException | ParserConfigurationException e) {
                    JOptionPane.showMessageDialog(null,e.getMessage());
                }
                 System.exit(0);
            }

            protected static void instertUpdate(String data,int columnNum,int rowNum) {//Method to add to spreadsheet
                /*The below writes to the file,the row if statements are there to stop the method
                 * overwriting any rows already created
                 */

                if(row != null){
                    if(row.getRowNum() != rowNum){
                        row = sheet.createRow(rowNum);
                    } 
                } else {
                    row = sheet.createRow(rowNum);
                }

                cell = row.createCell(columnNum);//Make our cell
                cell.setCellValue(data);//Write to it
            }

            private static SAXParser retrieveSaxParser() throws ParserConfigurationException,SAXException{
                return SAXParserFactory.newInstance().newSAXParser();//Get parser
            }

            private static DefaultHandler retrieveHandler() {
                DefaultHandler handler = new DefaultHandler(){//Handler with methods required for parsing xml

                    @Override
                    public void startElement(String uri,String localName,String qName,Attributes attributes) throws SAXException {
                        if(startwasprevIoUs == true){//Start indenting after the first element tag processed
                            indent++;
                        }

                        rowNumber++;//Move row down for each tag
                        columnNumber = indent; //Cell number set to current indent level

                        SO2.instertUpdate("<" + qName + ">",columnNumber,rowNumber);//Insert

                        startwasprevIoUs = true; //For formatting
                        prevIoUs = startTag;//For formatting
                    }

                    @Override
                    public void endElement(String uri,String qName) throws SAXException {
                        if(startwasprevIoUs == false){//For removal of indentation
                            indent--;
                        }

                        if(!prevIoUs.equals("text")){//If text wasn't last part parsed then set column to indent
                            columnNumber = indent;
                        } else{//If text was processed last move cell across
                            columnNumber++;
                        }

                        if(prevIoUs.equals("end")){//Move to a newline if last parsed element was an ending tag
                            rowNumber++;
                        }

                        if(startwasprevIoUs == false){ //If there was no text prevIoUsly
                            SO2.instertUpdate("</" + qName + ">",rowNumber); 
                        } else { //If there was text then this will be enclosing end tag
                            SO2.instertUpdate("</" + qName + ">",rowNumber);
                        }
                        startwasprevIoUs = false; //For formatting
                        prevIoUs = endTag;
                    }

                    @Override
                    public void characters(char ch[],int start,int length) throws SAXException {
                        String s = new String(ch,start,length).trim();//Get text
                        if(s.length() > 0){
                            columnNumber++; //Move column number along
                            SO2.instertUpdate(s,rowNumber);
                            prevIoUs = text; 
                        }
                    }
                };
                return handler;
            }


            //Main
            public static void main(String[] args) {
                JFrame file = new JFrame("File choice. . .");
                file.setDefaultCloSEOperation(JFrame.disPOSE_ON_CLOSE);

                FileDialog dialog = new FileDialog(file,"Choose a file",FileDialog.LOAD);//Get XML File
                dialog.setDirectory(Paths.get(System.getProperty("user.home")).resolve("Desktop").toString());
                dialog.setFile("*.xml");
                dialog.setVisible(true);

                if(dialog.getFile() == null){
                    System.exit(0);
                } else {
                    xmlFile = new File(dialog.getDirectory() + dialog.getFile());
                    javax.swing.SwingUtilities.invokelater(new Runnable() {
                        @Override
                        public void run() {
                            new SO2(xmlFile);
                        }
                    });
                }
            }


            private static File xmlFile;
            private static XSSFWorkbook wb;
            private static Sheet sheet;
            private static Row row;
            private static Cell cell;
            private static boolean startwasprevIoUs = false; //For formatting purposes
            private static int rowNumber = -1; //Hold row number
            private static int columnNumber = 0;//Hold number of cell to wtite to
            private static int indent;//For indenting
            private static String prevIoUs = "";//To kNow what was last processed
            private static final String endTag = "end";//Values for prevIoUs to hold
            private static final String text = "text";//Values for prevIoUs to hold
            private static final String startTag = "start";//Values for prevIoUs to hold
      }

这是我使用的xml文件：

<?xml version="1.0"?>
<empire>
        <darkness>
                        <sith>
                                <title>Darth</title>
                                <name>Vader</name>
                                <power>grip</power>
                        </sith>
                        <sith>
                                <title>Darth</title>
                                <name>Sidious</name>
                                <power>Lightning</power>
                    </sith>
        </darkness>

希望能帮助到你,祝好运