Java Apache POI Excel 保存为 PDF

Question

如何将

excel

文件转换/保存为

pdf

？我正在使用

java play framework

生成一些

excel

文件，现在要求更改为

pdf

。我不想重新编码一切。

有没有办法转换成

pdf

？

我生成的

excel

文件来自模板；我读取 Excel 模板文件，写入更改，然后另存为新的 Excel 文件。这样，模板就不会改变。它包含边框、图像和其他格式。

Answer 1

您需要以下 Java 库和关联的 JAR 文件才能使程序运行。 POI v3.8 iText v5.3.4

尝试此示例将 XLS 转换为 PDF

下面提供了接受 Excel 电子表格数据作为输入并将其转换为 PDF 表格数据的完整 Java 代码：

 import java.io.FileInputStream;
    import java.io.*;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.hssf.usermodel.HSSFSheet;
    import org.apache.poi.ss.usermodel.*;
    import java.util.Iterator;
   import com.itextpdf.text.*;
    import com.itextpdf.text.pdf.*;

    public class excel2pdf {  
            public static void main(String[] args) throws Exception{

                    FileInputStream input_document = new FileInputStream(new File("C:\\excel_to_pdf.xls"));
                    // Read workbook into HSSFWorkbook
                    HSSFWorkbook my_xls_workbook = new HSSFWorkbook(input_document); 
                    // Read worksheet into HSSFSheet
                    HSSFSheet my_worksheet = my_xls_workbook.getSheetAt(0); 
                    // To iterate over the rows
                    Iterator<Row> rowIterator = my_worksheet.iterator();
                    //We will create output PDF document objects at this point
                    Document iText_xls_2_pdf = new Document();
                    PdfWriter.getInstance(iText_xls_2_pdf, new FileOutputStream("Excel2PDF_Output.pdf"));
                    iText_xls_2_pdf.open();
                    //we have two columns in the Excel sheet, so we create a PDF table with two columns
                    //Note: There are ways to make this dynamic in nature, if you want to.
                    PdfPTable my_table = new PdfPTable(2);
                    //We will use the object below to dynamically add new data to the table
                    PdfPCell table_cell;
                    //Loop through rows.
                    while(rowIterator.hasNext()) {
                            Row row = rowIterator.next(); 
                            Iterator<Cell> cellIterator = row.cellIterator();
                                    while(cellIterator.hasNext()) {
                                            Cell cell = cellIterator.next(); //Fetch CELL
                                            switch(cell.getCellType()) { //Identify CELL type
                                                    //you need to add more code here based on
                                                    //your requirement / transformations
                                            case Cell.CELL_TYPE_STRING:
                                                    //Push the data from Excel to PDF Cell
                                                     table_cell=new PdfPCell(new Phrase(cell.getStringCellValue()));
                                                     //feel free to move the code below to suit to your needs
                                                     my_table.addCell(table_cell);
                                                    break;
                                            }
                                            //next line
                                    }

                    }
                    //Finally add the table to PDF document
                    iText_xls_2_pdf.add(my_table);                       
                    iText_xls_2_pdf.close();                
                    //we created our pdf file..
                    input_document.close(); //close xls
            }
    }

希望这对你有帮助

Answer 2

添加到 assylias 的答案

上面来自 assylias 的代码对我解决这个问题非常有帮助。如果您不关心生成的 PDF 看起来与 Excel pdf 导出的外观完全相同，那么 santhosh 的答案可能会很好。但是，如果您使用 Apache POI 填写 Excel 模板，然后尝试导出该模板，同时保留其外观，而不是在 iText 中编写大量代码只是为了尝试接近该外观，那么 VBS 选项是相当不错。

我将分享上面的 kotlin assylias 的 Java 版本，以防对任何人有帮助。所有解决方案的一般形式都归功于 assylias。

在爪哇中：

try {
    //create a temporary file and grab the path for it
    Path tempScript = Files.createTempFile("script", ".vbs");

    //read all the lines of the .vbs script into memory as a list
    //here we pull from the resources of a Gradle build, where the vbs script is stored
    System.out.println("Path for vbs script is: '" + Main.class.getResource("xl2pdf.vbs").toString().substring(6) + "'");
    List<String> script = Files.readAllLines(Paths.get(Main.class.getResource("xl2pdf.vbs").toString().substring(6)));

    // append test.xlsm for file name. savePath was passed to this function
    String templateFile = savePath + "\\test.xlsm";
    templateFile = templateFile.replace("\\", "\\\\");
    String pdfFile = savePath + "\\test.pdf";
    pdfFile = pdfFile.replace("\\", "\\\\");
    System.out.println("templateFile is: " + templateFile);
    System.out.println("pdfFile is: " + pdfFile);

    //replace the placeholders in the vbs script with the chosen file paths
    for (int i = 0; i < script.size(); i++) {
        script.set(i, script.get(i).replaceAll("XL_FILE", templateFile));
        script.set(i, script.get(i).replaceAll("PDF_FILE", pdfFile));
        System.out.println("Line " + i + " is: " + script.get(i));
    }

    //write the modified code to the temporary script
    Files.write(tempScript, script);

    //create a processBuilder for starting an operating system process
    ProcessBuilder pb = new ProcessBuilder("wscript", tempScript.toString());

    //start the process on the operating system
    Process process = pb.start();

    //tell the process how long to wait for timeout
    Boolean success = process.waitFor(timeout, minutes);
    if(!success) {
        System.out.println("Error: Could not print PDF within " + timeout + minutes);
    } else {
        System.out.println("Process to run visual basic script for pdf conversion succeeded.");
    }
    
} catch (Exception e) {
    e.printStackTrace();
    Alert saveAsPdfAlert = new Alert(AlertType.ERROR);
    saveAsPdfAlert.setTitle("ERROR: Error converting to pdf.");
    saveAsPdfAlert.setHeaderText("Exception message is:");
    saveAsPdfAlert.setContentText(e.getMessage());
    saveAsPdfAlert.showAndWait();  
}

VBS：

Option Explicit
Dim objExcel, strExcelPath, objSheet

strExcelPath = "XL_FILE"


Set objExcel = CreateObject("Excel.Application")
objExcel.WorkBooks.Open strExcelPath
Set objSheet = objExcel.ActiveWorkbook.Worksheets(1)

objSheet.ExportAsFixedFormat 0, "PDF_FILE",0, 1, 0, , , 0

objExcel.ActiveWorkbook.Close
objExcel.Application.Quit

Answer 3

另一种方法是使用 VB 脚本并从 Java 调用它。

示例：

xl2pdf.vbs

Option Explicit
Dim objExcel, strExcelPath, objSheet

strExcelPath = "$XL_FILE"

Set objExcel = CreateObject("Excel.Application")
objExcel.WorkBooks.Open strExcelPath
Set objSheet = objExcel.ActiveWorkbook.Worksheets(1)

objSheet.ExportAsFixedFormat 0, "$PDF_FILE",0, 1, 0, , , 0

objExcel.ActiveWorkbook.Close
objExcel.Application.Quit

Java 中（实际上是 kotlin，但很容易翻译）

fun xl2pdf(xlFile: Path, pdfFile: Path, timeout: Long = 1, timeUnit: TimeUnit = TimeUnit.MINUTES) {
  val tempScript = Files.createTempFile("script", ".vbs")
  val script = Files.readAllLines(Paths.get("xl2pdf.vbs"))
          .map { it.replace("\$XL_FILE", "$xlFile") }
          .map { it.replace("\$PDF_FILE", "$pdfFile") }
  Files.write(tempScript, script)
  try {
    val pb = ProcessBuilder("wscript", tempScript.toString())
    val process = pb.start()
    val success = process.waitFor(timeout, timeUnit)
    if (!success) LOG.error("Could not print PDF within $timeout $timeUnit")
  } catch (e: IOException) {
    LOG.error("Error while printing Excel file to PDF", e)
  }
}

Answer 4

存储库

<repository>
    <id>com.e-iceblue</id>
    <name>e-iceblue</name>
    <url>http://repo.e-iceblue.com/nexus/content/groups/public/</url>
</repository>

依赖性

<dependency>
    <groupId>e-iceblue</groupId>
    <artifactId>spire.xls.free</artifactId>
    <version>5.1.0</version>
</dependency>

代码

import com.spire.xls.FileFormat;
import com.spire.xls.Workbook;

import java.io.File;

public class EIceblueConverter {
    public static void main(String[] args) {
        for (Sources xls : Sources.values()) {
            if (isFileExists(xls)) convert(xls);
        }
    }

    private static boolean isFileExists(Sources xls) {
        File file = new File(xls.getPath());
        return file.exists() && file.isFile();
    }

    private static void convert(Sources xls) {
        Workbook workbook = new Workbook();
        workbook.loadFromFile(xls.getPath());
        workbook.getConverterSetting().setSheetFitToPage(true);
        workbook.saveToFile(Util.getOutputPath(xls.getPath()), FileFormat.PDF);
    }
}

在转换之前，您应该编辑文件.xls 中的视图区域*

...以及更多转换器，包括有趣的解决方案：使用 libre office 作为 .xls* 到 .pdf 的转换器。 （在 src/main/java/jodconverter/AppStarter.java 中测试它）

https://github.com/fedor83/xlsToPdfConverter.git

Answer 5

这是完整的工作示例

依赖关系：

compile 'com.itextpdf:itextpdf:5.5.13.2'
compile 'org.apache.poi:poi-ooxml:5.0.0'

Java代码：

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

import java.util.Iterator;
import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

public class Excel2PDF {
    public static void main(String[] args) throws Exception {

        Workbook my_xls_workbook = WorkbookFactory.create(new File("/Users/harshad/Desktop/excel.xlsx"));

        Sheet my_worksheet = my_xls_workbook.getSheetAt(0);

        short availableColumns = my_worksheet.getRow(0).getLastCellNum();
        System.out.println("Available columns : " + availableColumns);

        Iterator<Row> rowIterator = my_worksheet.iterator();

        Document iText_xls_2_pdf = new Document();
        PdfWriter.getInstance(iText_xls_2_pdf, new FileOutputStream("/Users/harshad/Desktop/excel.pdf"));
        iText_xls_2_pdf.open();

        PdfPTable my_table = new PdfPTable(availableColumns);

        PdfPCell table_cell = null;

        while (rowIterator.hasNext()) {
            Row row = rowIterator.next();
            Iterator<Cell> cellIterator = row.cellIterator();

            while (cellIterator.hasNext()) {
                Cell cell = cellIterator.next();

                switch (cell.getCellType()) {
                    default:
                        try {
                            table_cell = new PdfPCell(new Phrase(cell.getStringCellValue()));
                        } catch (IllegalStateException illegalStateException) {
                            //TODO: Need to handle exceptions for different type too
                            if (illegalStateException.getMessage().equals("Cannot get a STRING value from a NUMERIC cell")) {
                                table_cell = new PdfPCell(new Phrase(String.valueOf(cell.getNumericCellValue())));
                            }
                        }

                        my_table.addCell(table_cell);
                        break;
                }
            }
        }
        iText_xls_2_pdf.add(my_table);
        iText_xls_2_pdf.close();
        my_xls_workbook.close();
    }
}