用于pdf的spring batch itemWriter-Java 学习之路

是否有任何方法使用spring批处理ItemWriter将数据写入PDF文件 . 我看到了很多关于.txt，.xml等的例子 . 对于pdf writer我没有 . 使用批量 spring 启动 . 提前致谢 .

2 回答

1

生成PDF文档没有开箱即用的 ItemWriter . 但是，实现自己的应该可以直接使用各种开源库 .

回复于 2024-04-20T07:12:13+08:00

您不需要ItemWriter将数据写入PDF . 你可以做的是在作者和读者之间使用处理器 . 现有的API库可以将DB，XML或JSON转换为PDF . 这是Tutorials Point的一个例子，我在程序中成功地读取了XML到DB，同时创建了一个PDF文件 .

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.PDType1Font;
import org.springframework.batch.item.ItemProcessor;

public class CustomItemProcessor implements ItemProcessor<Tutorial, Tutorial> {

public static void drawTable(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 = 50;
    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);

    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;
    }
}

@Override
public Tutorial process(Tutorial item) throws Exception {
    System.out.println("Processing..." + item);

    // Creating PDF document object
    File f = new File("/Users/zhenxu/Desktop/test.pdf");
    PDDocument doc = PDDocument.load(f);

    // Creating a blank page
    PDPage page = new PDPage();
    doc.addPage(page);
    PDPageContentStream contentStream = new PDPageContentStream(doc, page);

    String[][] content = { { "Id", "" + item.getTutorial_id() }, { "Title", item.getTutorial_title() },
            { "Authour", item.getTutorial_author() }, { "Submission Date", item.getSubmission_date() } };
    drawTable(page, contentStream, 700, 100, content);

    contentStream.close();
    doc.save("/Users/zhenxu/Desktop/test.pdf");
    System.out.println("Hello");
    return item;
}

这里输入 item 是输入XML . 作业配置如下：

<!-- Defining a job--> 
<batch:job id = "helloWorldJob">  
    <!-- Defining a Step --> 
    <batch:step id = "step1"> 
        <batch:tasklet>
            <!-- try use PDF converter -->
            <batch:chunk reader="xmlItemReader" writer="mySqlItemWriter" processor="itemProcessor" commit-interval="10"></batch:chunk>                
        </batch:tasklet>    
    </batch:step>  
</batch:job>

您可以自定义您的读者和作者以及其他类型的工作 .

回复于 2024-04-20T07:12:13+08:00

用于pdf的spring batch itemWriter

2 回答

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