Question

我有下面的代码，它读取excel文件并在java中显示。我想在将excel文件中的数据读取到java后实现代码，它将以XML格式转换并保存在XML文件中。

任何代码示例或引用都会感激不尽;

public class POIExcelReader {

    public POIExcelReader (){
    }

    public void displayFromExcel (String xlsPath)
    {
        InputStream inputStream = null; 
        try
        {
            inputStream = new FileInputStream (xlsPath);
        }
        catch (FileNotFoundException e)
        {
            System.out.println ("File not found in the specified path.");
            e.printStackTrace ();
        }

        POIFSFileSystem fileSystem = null;

        try {
            fileSystem = new POIFSFileSystem (inputStream);
            HSSFWorkbook      workBook = new HSSFWorkbook (fileSystem);
            HSSFSheet         sheet    = workBook.getSheetAt (0);
            Iterator<?> rows     = sheet.rowIterator ();

            while (rows.hasNext ())
            {
                HSSFRow row = (HSSFRow) rows.next();

                // display row number
                System.out.println ("Row No.: " + row.getRowNum ());

                // get a row, iterate through cells.
                Iterator<?> cells = row.cellIterator ();

                while (cells.hasNext ())
                {
                    HSSFCell cell = (HSSFCell) cells.next ();
                    //System.out.println ("Cell : " + cell.getCellNum ());
                    switch (cell.getCellType ())
                    {
                    case HSSFCell.CELL_TYPE_NUMERIC :
                    {
                        // NUMERIC CELL TYPE
                        System.out.println ("Numeric: " + cell.getNumericCellValue ());
                        break;
                    }
                    case HSSFCell.CELL_TYPE_STRING :

                    {
                        // STRING CELL TYPE
                        HSSFRichTextString richTextString = cell.getRichStringCellValue ();

                        System.out.println ("String: " + richTextString.getString ());
                        break;
                    }
                    default:
                    {
                        // types other than String and Numeric.
                        System.out.println ("Type not supported.");
                        break;
                    }
                }
            }
        }
    }
        catch(IOException e)
        {
            e.printStackTrace ();
        }
    }


    public static void main (String[] args)
    {
        POIExcelReader poiExample = new POIExcelReader ();
        String xlsPath ="c://Users//Secured//Desktop//artikli.xls";
        poiExample.displayFromExcel (xlsPath);
    }
}

Answer 1

您可以使用包中的类：javax.xml.parsers。该包提供了允许处理XML文档的类。例如DocumentBuilder，DocumentBuilderFactory，仅举几例。

使用下面的java代码（扩展原始代码）和位于此位置的文件：http://base.google.com/base/products.xls

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class POIExcelReader {

public POIExcelReader (){
}

public void displayFromExcel (String xlsPath)
{
    InputStream inputStream = null; 
    try
    {
        inputStream = new FileInputStream (xlsPath);
    }
    catch (FileNotFoundException e)
    {
        System.out.println ("File not found in the specified path.");
        e.printStackTrace ();
    }

    POIFSFileSystem fileSystem = null;

    try {
        //Initializing the XML document
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = factory.newDocumentBuilder();
        Document document = builder.newDocument();
        Element rootElement = document.createElement("products");
        document.appendChild(rootElement);


        fileSystem = new POIFSFileSystem (inputStream);
        HSSFWorkbook      workBook = new HSSFWorkbook (fileSystem);
        HSSFSheet         sheet    = workBook.getSheetAt (0); 
        Iterator<?> rows     = sheet.rowIterator ();

        ArrayList<ArrayList<String>> data = new ArrayList<ArrayList<String>>();
        while (rows.hasNext ()) 
        {
            HSSFRow row = (HSSFRow) rows.next(); 

            int rowNumber = row.getRowNum ();
            // display row number
            System.out.println ("Row No.: " + rowNumber);

            // get a row, iterate through cells.
            Iterator<?> cells = row.cellIterator (); 

            ArrayList<String> rowData = new ArrayList<String>();
            while (cells.hasNext ())
            {
                HSSFCell cell = (HSSFCell) cells.next ();
                //System.out.println ("Cell : " + cell.getCellNum ());
                switch (cell.getCellType ())
                {
                case HSSFCell.CELL_TYPE_NUMERIC :
                {
                    // NUMERIC CELL TYPE
                    System.out.println ("Numeric: " + cell.getNumericCellValue ());
                    rowData.add(cell.getNumericCellValue () + "");
                    break;
                }
                case HSSFCell.CELL_TYPE_STRING :

                {
                    // STRING CELL TYPE
                    HSSFRichTextString richTextString = cell.getRichStringCellValue ();

                    System.out.println ("String: " + richTextString.getString ());
                    rowData.add(richTextString.getString ());
                    break;
                }
                default:
                {
                    // types other than String and Numeric.
                    System.out.println ("Type not supported.");
                    break;
                }
                } // end switch

            } // end while
            data.add(rowData);


        } //end while

        int numOfProduct = data.size();

        for (int i = 1; i < numOfProduct; i++){
            Element productElement = document.createElement("product");
            rootElement.appendChild(productElement);

            int index = 0;
            for(String s: data.get(i)) {
                String headerString = data.get(0).get(index);
                if( data.get(0).get(index).equals("image link") ){
                    headerString = "image_link";
                }

                if( data.get(0).get(index).equals("product type") ){
                    headerString = "product_type";
                }

                Element headerElement = document.createElement(headerString);
                productElement.appendChild(headerElement);
                headerElement.appendChild(document.createTextNode(s));
                index++;
            }
        }

        TransformerFactory tFactory = TransformerFactory.newInstance();

        Transformer transformer = tFactory.newTransformer();
        //Add indentation to output
        transformer.setOutputProperty
        (OutputKeys.INDENT, "yes");
        transformer.setOutputProperty(
                "{http://xml.apache.org/xslt}indent-amount", "2");

        DOMSource source = new DOMSource(document);
        StreamResult result = new StreamResult(new File("products.xml"));
        //StreamResult result = new StreamResult(System.out);
        transformer.transform(source, result);

    }
    catch(IOException e)
    {
        System.out.println("IOException " + e.getMessage());
    } catch (ParserConfigurationException e) {
        System.out.println("ParserConfigurationException " + e.getMessage());
    } catch (TransformerConfigurationException e) {
        System.out.println("TransformerConfigurationException "+ e.getMessage());
    } catch (TransformerException e) {
        System.out.println("TransformerException " + e.getMessage());
    }
}


public static void main (String[] args)
{
    POIExcelReader poiExample = new POIExcelReader ();
    String xlsPath ="products.xls";
    poiExample.displayFromExcel (xlsPath);
}
}

Answer 2

import java.io.*;
import java.util.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.w3c.dom.Document;
import org.w3c.dom.Element;


public class MyExp {
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;

public MyExp(){
    try {
        domFactory = DocumentBuilderFactory.newInstance();
        domBuilder = domFactory.newDocumentBuilder();
    } catch (FactoryConfigurationError exp) {
        System.err.println(exp.toString());
    } catch (ParserConfigurationException exp) {
        System.err.println(exp.toString());
    } catch (Exception exp) {
        System.err.println(exp.toString());
    }
}
public void convertFile(String xlsFileName, String xmlFileName){

    try {
        Document newDoc = domBuilder.newDocument();
        Element rootElement = newDoc.createElement("XMLCreators");
        newDoc.appendChild(rootElement);
        InputStream InputStream=new FileInputStream(new File(xlsFileName));
        HSSFWorkbook      workBook = new HSSFWorkbook (InputStream);
        HSSFSheet         sheet    = workBook.getSheetAt (0); 
        Iterator<?> rows     = sheet.rowIterator ();
        List<String> headers = new ArrayList<String>(5);
        while (rows.hasNext ()) 
        {
            HSSFRow row = (HSSFRow) rows.next(); 

            int rowNumber = row.getRowNum ();
            Iterator<?> cells = row.cellIterator (); 
            ArrayList<String> rowData = new ArrayList<String>();
            while (cells.hasNext ())
            {
                HSSFCell cell = (HSSFCell) cells.next ();
                switch (cell.getCellType ())
                {
                case HSSFCell.CELL_TYPE_NUMERIC :
                {
                    // NUMERIC CELL TYPE
                    rowData.add(cell.getNumericCellValue () + "");
                    break;
                }
                case HSSFCell.CELL_TYPE_STRING :

                {
                    // STRING CELL TYPE
          HSSFRichTextString richTextString = cell.getRichStringCellValue();
                    rowData.add(richTextString.getString ());
                    break;
                }
                default:
                {
                    break;
                }
              }



            } // end while
            if(rowNumber==1){
                headers.addAll(rowData);
            }
            else
            {
                    Element rowElement = newDoc.createElement("row");
                    rootElement.appendChild(rowElement);
                    for (int col = 0; col < headers.size(); col++) {

                        String header = headers.get(col);
                        String value = null;

                        if (col < rowData.size()) {

                            value = rowData.get(col);

                        } else {
                            value = "";
                        }

                        Element curElement = newDoc.createElement(header);
                       curElement.appendChild(newDoc.createTextNode(value));
                        rowElement.appendChild(curElement);

                    }

            }

        } //end while

        ByteArrayOutputStream baos = null;
        OutputStreamWriter osw = null;

        try {

            baos = new ByteArrayOutputStream();
            osw = new OutputStreamWriter(baos);

          TransformerFactory tranFactory = ransformerFactory.newInstance();
            Transformer aTransformer = tranFactory.newTransformer();
            aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
            aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
          aTransformer.setOutputProperty("http://xml.apache.org/xslt}indent-amount", "4");

            Source src = new DOMSource(newDoc);
            Result result = new StreamResult(new File(xmlFileName));
            aTransformer.transform(src, result);

            osw.flush();
            System.out.println(new String(baos.toByteArray()));

        } catch (Exception exp) {
            exp.printStackTrace();
        } finally {
            try {
                osw.close();
            } catch (Exception e) {
            }
            try {
                baos.close();
            } catch (Exception e) {
            }
        }

    }
    catch(IOException e)
    {
        System.out.println("IOException " + e.getMessage());
    }
}


public static void main (String[] args)
{
    MyExp poiExample = new MyExp ();
    poiExample.convertFile("srcfile.xls", "destfile.xml");
}

}

使用java将excel数据解析为xml

2 个答案: