java - 如何使用 Java 从 Excel (XLSX) 构建 XML

Question

我正在使用 netbeans 7.0 中的 Java 读取 Excel (XSLX) 文件。 我也能够读取 Excel 工作表内容并将其打印输出。

现在我必须将 Excel 数据转换为 XML 文件。标签将是列标题，每一行都会进入相应的标签。

这是 xslx 文件中的输入工作表。 ID、变量、描述和注释是列标题。

ID          Variable     Desc     Notes
B0001                    VSI_C  
B0001           1        VSI_C_R    
B0001           2        VSI_C_P    
B0002                    VSI_C_L    
B0003                    VSI_C_H    
B0004                    VSI_C_O    

现在，我正在将此数据转换为 XML 文件。 我期望的输出是，

<?xml version="1.0" encoding="UTF-8"?>
<Bin_code>
<DCT>
    <ID>B0001</ID>
    <Variable/>
    <Desc>VSI_C</Desc>
    <Notes/>
</DCT>
<DCT>
    <ID>B0001</ID>
    <Variable/>
    <Desc>VSI_C_R</Desc>
    <Notes/>
</DCT>
     ............
     ...............
</Bin_code>

我已经尝试过了。我知道我必须使用“sheet”对象。但我不确定如何使用它。

import java.io.File;

import java.io.FileInputStream;
import java.io.InputStream;
import java.io.*;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel. Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class XSLXReader {   
public static void main(String[] args) 
{   
    DataInputStream in = null;
    BufferedReader br = null;
    FileWriter fostream;
    FileWriter fostreamBatch;
    BufferedWriter out = null;
    BufferedWriter outBatch = null;
    String strOutputPath = "D:\\Proj\\Current_\\";
    String strFilePrefix = "Master 5.2-B";
    String strLine;

    try {           
    InputStream inputStream = new FileInputStream(new File("D:\\Proj\\Current_\\Master A-B.xlsx"));
    Workbook wb = WorkbookFactory.create(inputStream);            
    Sheet sheet = wb.getSheet("Bin-code");

    in = new DataInputStream(inputStream);
    br = new BufferedReader(new InputStreamReader(in));

    fostream = new FileWriter(strOutputPath+"\\"+strFilePrefix+".xml");
    out = new BufferedWriter(fostream);

    out.write("<Bin-code>");

    while ((strLine = br.readLine()) != null)
    {
        out.write("<DCT>");
        out.write("<ID>" + strLine.substring(1, strLine.length()) + "</ID>");

        out.write("</DCT>");

    }
    out.write("</Bin-code>");
} catch (Exception e) {         
    e.printStackTrace();        
}   
}

}

请帮助我将 xslx 中的输入数据构造为 xml 中的输出数据，如上所示。

谢谢 拉姆

Answer 1

您不应该使用InputStream直接读取文件。打开工作簿并访问工作表后，您只需迭代工作表中的所有行，然后迭代该行中的单元格。示例位于 Apache POI 站点 http://poi.apache.org/spreadsheet/quick-guide.html#Iterator 。然后，您可以像现在一样手动打印 XML，或者使用众多 XML 库之一和 DTD 来为您完成此操作。

这是完整的源代码:

import java.io.*;
import org.apache.poi.ss.usermodel.*;
import java.text.*;

public class XSLXReader {
    static DecimalFormat df = new DecimalFormat("#####0");

    public static void main(String[] args) {
        FileWriter fostream;
        PrintWriter out = null;
        String strOutputPath = "D:\\Proj\\Current_\\";
        String strFilePrefix = "Master 5.2-B";

        try {
            InputStream inputStream = new FileInputStream(new File("D:\\Proj\\Current_\\Master A-B.xlsx"));
            Workbook wb = WorkbookFactory.create(inputStream);
            Sheet sheet = wb.getSheet("Bin-code");

            fostream = new FileWriter(strOutputPath + "\\" + strFilePrefix+ ".xml");
            out = new PrintWriter(new BufferedWriter(fostream));

            out.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
            out.println("<Bin-code>");

            boolean firstRow = true;
            for (Row row : sheet) {
                if (firstRow == true) {
                    firstRow = false;
                    continue;
                }
                out.println("\t<DCT>");
                out.println(formatElement("\t\t", "ID", formatCell(row.getCell(0))));
                out.println(formatElement("\t\t", "Variable", formatCell(row.getCell(1))));
                out.println(formatElement("\t\t", "Desc", formatCell(row.getCell(2))));
                out.println(formatElement("\t\t", "Notes", formatCell(row.getCell(3))));
                out.println("\t</DCT>");
            }
            out.write("</Bin-code>");
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String formatCell(Cell cell)
    {
        if (cell == null) {
            return "";
        }
        switch(cell.getCellType()) {
            case Cell.CELL_TYPE_BLANK:
                return "";
            case Cell.CELL_TYPE_BOOLEAN:
                return Boolean.toString(cell.getBooleanCellValue());
            case Cell.CELL_TYPE_ERROR:
                return "*error*";
            case Cell.CELL_TYPE_NUMERIC:
                return XSLXReader.df.format(cell.getNumericCellValue());
            case Cell.CELL_TYPE_STRING:
                return cell.getStringCellValue();
            default:
                return "<unknown value>";
        }
    }

    private static String formatElement(String prefix, String tag, String value) {
        StringBuilder sb = new StringBuilder(prefix);
        sb.append("<");
        sb.append(tag);
        if (value != null && value.length() > 0) {
            sb.append(">");
            sb.append(value);
            sb.append("</");
            sb.append(tag);
            sb.append(">");
        } else {
            sb.append("/>");
        }
        return sb.toString();
    }
}

这会产生输出:

<?xml version="1.0" encoding="UTF-8"?>
<Bin-code>
    <DCT>
        <ID>B0001</ID>
        <Variable/>
        <Desc>VSI_C</Desc>
        <Notes/>
    </DCT>
    <DCT>
        <ID>B0001</ID>
        <Variable>1</Variable>
        <Desc>VSI_C_R</Desc>
        <Notes/>
    </DCT>
    <DCT>
        <ID>B0001</ID>
        <Variable>2</Variable>
        <Desc>VSI_C_P</Desc>
        <Notes/>
    </DCT>
    <DCT>
        <ID>B0002</ID>
        <Variable/>
        <Desc>VSI_C_L</Desc>
        <Notes/>
    </DCT>
    <DCT>
        <ID>B0003</ID>
        <Variable/>
        <Desc>VSI_C_H</Desc>
        <Notes/>
    </DCT>
    <DCT>
        <ID>B0004</ID>
        <Variable/>
        <Desc>VSI_C_O</Desc>
        <Notes/>
    </DCT>
</Bin-code>