Java使用PDFBox绘制中文表格

该博客演示了如何使用Apache PDFBox库在PDF文件中绘制表格。代码示例展示了如何设置字体、行列、单元格间距,并填充文本内容。

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import java.io.File;
import java.io.IOException;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDType0Font;

import org.apache.pdfbox.pdmodel.font.PDType1Font;

public class pdfbox_tables {

    /**
     * @param page
     * @param contentStream
     * @param y the y-coordinate of the first row
     * @param margin the padding on left and right of table
     * @param content a 2d array containing the table data
     * @throws IOException
     */
    public static void drawTable(PDDocument doc, PDPage page, PDPageContentStream contentStream,
            float y, float margin,
            String[][] content) throws IOException {
        final int rows = content.length;
        final int cols = content[0].length;
        final float rowHeight = 20f;
        final float tableWidth = page.getMediaBox().getWidth() - (2 * margin);
        final float tableHeight = rowHeight * rows;
        final float colWidth = tableWidth / (float) cols;
        final float cellMargin = 5f;

        //draw the rows
        float nexty = y;
        for (int i = 0; i <= rows; i++) {
            contentStream.drawLine(margin, nexty, margin + tableWidth, nexty);
            nexty -= rowHeight;
        }

        //draw the columns
        float nextx = margin;
        for (int i = 0; i <= cols; i++) {
            contentStream.drawLine(nextx, y, nextx, y - tableHeight);
            nextx += colWidth;
        }

        //now add the text
        //contentStream.setFont(PDType1Font.HELVETICA_BOLD, 12);
        contentStream.setFont(PDType0Font.load(doc, new File("C:\\Windows\\Fonts\\simfang.TTF")), 12);
        float textx = margin + cellMargin;
        float texty = y - 15;
        for (int i = 0; i < content.length; i++) {
            for (int j = 0; j < content[i].length; j++) {
                String text = content[i][j];
                contentStream.beginText();
                contentStream.moveTextPositionByAmount(textx, texty);
                contentStream.drawString(text);
                contentStream.endText();
                textx += colWidth;
            }
            texty -= rowHeight;
            textx = margin + cellMargin;
        }
    }

    public static void main(String[] args) throws IOException {
        PDDocument doc = new PDDocument();
        PDPage page = new PDPage();
        doc.addPage(page);

        PDPageContentStream contentStream
                = new PDPageContentStream(doc, page);

        String[][] content = {{"a", "b", "1"},
        {"c中", "d", "2"},
        {"e", "f文", "3"},
        {"g", "h", "4的"},
        {"i", "j", "5测试"}};

        drawTable(doc, page, contentStream, 700, 100, content);
        contentStream.close();
        doc.save("F:/test_table.pdf");
    }
}

 

### 使用 JavaPDFBox 库创建 PDF 文件 以下是使用 Apache PDFBox 创建一个简单 PDF 文件的示例代码。该代码展示了如何向 PDF 添加文本内容。 ```java import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.PDPageContentStream; import org.apache.pdfbox.pdmodel.font.PDFont; import org.apache.pdfbox.pdmodel.font.PDType1Font; import java.io.IOException; public class CreatePDFExample { public static void main(String[] args) { try (PDDocument document = new PDDocument()) { PDPage page = new PDPage(); document.addPage(page); try (PDPageContentStream contentStream = new PDPageContentStream(document, page)) { PDFont font = PDType1Font.HELVETICA_BOLD; contentStream.beginText(); contentStream.setFont(font, 12); contentStream.newLineAtOffset(100, 700); // 设置起始位置 contentStream.showText("这是一个由Apache PDFBox生成的PDF文件。"); contentStream.endText(); } String outputFilePath = "example.pdf"; document.save(outputFilePath); } catch (IOException e) { e.printStackTrace(); } } } ``` 上述代码片段用于创建一个新的 PDF 文件,并在其中写入一段中文文字[^1]。 --- 如果需要进一步扩展功能,比如添加表格或图片,则可以参考更复杂的实现方式: #### 添加表格的示例代码 以下是如何利用 `PDPageContentStream` 绘制矩形框来模拟表格结构的方法。 ```java import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.PDPageContentStream; import org.apache.pdfbox.pdmodel.font.PDFont; import org.apache.pdfbox.pdmodel.font.PDType1Font; import java.io.IOException; public class CreateTableInPDF { private static final float MARGIN = 50f; private static final int ROWS = 3; private static final int COLS = 2; public static void main(String[] args) throws IOException { try (PDDocument document = new PDDocument()) { PDPage page = new PDPage(); document.addPage(page); try (PDPageContentStream contentStream = new PDPageContentStream(document, page)) { PDFont font = PDType1Font.TIMES_ROMAN; contentStream.setFont(font, 12); float yPosition = page.getMediaBox().getHeight() - MARGIN; // 起始Y坐标 float tableWidth = page.getMediaBox().getWidth() - 2 * MARGIN; // 表格宽度 float rowHeight = 20f; // 单元格高度 float colWidth = tableWidth / COLS; // 列宽 for (int i = 0; i <= ROWS; i++) { // 绘制水平线 contentStream.drawLine(MARGIN, yPosition, MARGIN + tableWidth, yPosition); yPosition -= rowHeight; } for (int j = 0; j <= COLS; j++) { // 绘制垂直线 contentStream.drawLine(MARGIN + j * colWidth, page.getMediaBox().getHeight() - MARGIN, MARGIN + j * colWidth, MARGIN); } // 填充单元格数据 String[][] data = {{"姓名", "年龄"}, {"张三", "28"}, {"李四", "34"}}; yPosition = page.getMediaBox().getHeight() - MARGIN - rowHeight; for (String[] rowData : data) { float xPosition = MARGIN; for (String cellData : rowData) { contentStream.beginText(); contentStream.newLineAtOffset(xPosition + 5, yPosition - 5); // 微调偏移量 contentStream.showText(cellData); contentStream.endText(); xPosition += colWidth; } yPosition -= rowHeight; } } document.save("table_example.pdf"); } } } ``` 这段代码通过绘制线条和填充文本的方式构建了一个简单的表格。 --- 对于加密需求,可以通过如下方法实现 PDF 加密: ```java import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.encryption.AccessPermission; import org.apache.pdfbox.pdmodel.encryption.StandardProtectionPolicy; import java.io.File; import java.io.IOException; public class EncryptPDFExample { public static void main(String[] args) { try (PDDocument document = PDDocument.load(new File("input.pdf"))) { AccessPermission ap = new AccessPermission(); // 定义权限 StandardProtectionPolicy spp = new StandardProtectionPolicy( "ownerPassword", "userPassword", ap); // 设置密码 spp.setEncryptionKeyLength(128); // AES-128位加密 document.protect(spp); document.save("encrypted_output.pdf"); } catch (IOException | IllegalArgumentException e) { e.printStackTrace(); } } } ``` 此代码实现了对现有 PDF 文件的加密处理[^2]。 --- 最后,若要将生成的 PDF 输出至浏览器,可结合 Servlet 实现动态响应流输出[^5]。 ```java import org.apache.pdfbox.pdmodel.PDDocument; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.OutputStream; @WebServlet("/exportPdf") public class ExportPdfServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("application/pdf"); response.setHeader("Content-Disposition", "inline; filename=generated_pdf.pdf"); try (OutputStream out = response.getOutputStream(); PDDocument document = new PDDocument()) { PDPage page = new PDPage(); document.addPage(page); try (PDPageContentStream contentStream = new PDPageContentStream(document, page)) { contentStream.beginText(); contentStream.setFont(PDType1Font.HELVETICA_BOLD, 12); contentStream.newLineAtOffset(100, 700); contentStream.showText("这是从服务器端生成的PDF!"); contentStream.endText(); } document.writeTo(out); } } } ``` ---
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