提问人：Altan Mehmet Türkmen 提问时间：1/3/2023 最后编辑：ChristopherAltan Mehmet Türkmen 更新时间：4/17/2023 访问量：155
无法在Spring Boot，Java中使用Apache速度和itextpdf将页面从html水平拆分为pdf转换
Can't split the page horizontally from html to pdf conversion with Apache velocity and itextpdf in Spring Boot,Java
问：
我有一个函数可以从数据库中获取数据并将它们填充到准备好的 HTML 模板中，然后将它们导出到 pdf 文件。为此，我正在使用 Apache Velocity vm 文件和 itextpdf。我需要在一页上执行此操作，因为用户将打印 pdf 文件。由于 itextpdf 版本，用于拆分页面的传统 CSS 代码不起作用。
以下是预期输出：
这是我的结果（它在一列流中创建页面）：
这是我的pom.xml：
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.7</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.0.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.itextpdf.tool/xmlworker -->
<dependency>
<groupId>com.itextpdf.tool</groupId>
<artifactId>xmlworker</artifactId>
<version>5.5.10</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>5.5.11</version>
</dependency>
这是我的控制器类，用于创建和下载 pdf 文件：
@GetMapping("/genpdf/{fileName}")
HttpEntity<byte[]> createPdf(
@PathVariable("fileName") String fileName) throws IOException {
/* first, get and initialize an engine */
VelocityEngine ve = new VelocityEngine();
/* next, get the Template */
ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
ve.setProperty("classpath.resource.loader.class",
ClasspathResourceLoader.class.getName());
ve.init();
Template t = ve.getTemplate("templates/helloworld.vm");
/* create a context and add data */
VelocityContext context = new VelocityContext();
context.put("name", "World");
context.put("genDateTime", LocalDateTime.now().toString());
/* now render the template into a StringWriter */
StringWriter writer = new StringWriter();
t.merge(context, writer);
/* show the World */
System.out.println(writer.toString());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
baos = generatePdf(writer.toString());
HttpHeaders header = new HttpHeaders();
header.setContentType(MediaType.APPLICATION_PDF);
header.set(HttpHeaders.CONTENT_DISPOSITION,
"attachment; filename=" + fileName.replace(" ", "_"));
header.setContentLength(baos.toByteArray().length);
return new HttpEntity<byte[]>(baos.toByteArray(), header);
}
public ByteArrayOutputStream generatePdf(String html) {
String pdfFilePath = "";
PdfWriter pdfWriter = null;
// create a new document
Document document = new Document();
try {
document = new Document();
// document header attributes
document.addCreationDate();
document.addTitle("HTML to PDF using itext");
document.setPageCount(1);
document.addLanguage("tr");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
pdfWriter = PdfWriter.getInstance(document, baos);
// open document
document.open();
pdfWriter.addPageDictEntry(PdfName.PDF, PdfPage.LANDSCAPE);
XMLWorkerHelper xmlWorkerHelper = XMLWorkerHelper.getInstance();
xmlWorkerHelper.parseXHtml(pdfWriter, document, new StringReader(
html));
// close the document
document.close();
System.out.println("PDF generated successfully");
return baos;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
这是我的test.vm文件，用于生成pdf文件：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//TR"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html lang="tr">
<head>
<style >
p {
font-size: 10px;
}
span {
font-size: 10px
}
.split {
height: 100%;
width: 50%;
position: fixed;
z-index: 1;
top: 0;
overflow-x: hidden;
padding-top: 20px;
}
/* Control the left side */
.left {
left: 0;
background-color: #111;
}
/* Control the right side */
.right {
right: 0;
background-color: darkblue;
}
</style>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<title>Sceda Techniqa</title>
</head>
<body>
<div class="split left">
<div style="display: flex;flex-direction: row">
<p>test</p>
<span><strong>test</strong></span>
</div>
<div style="display: flex;flex-direction: row">
<p>test</p>
</div>
</div>
</div>
<div class="split right">
<div style="display: flex;flex-direction: row">
<span><strong>test</strong></span>
</div>
<div style="display: flex;flex-direction: column">
<div style="display: flex;flex-direction: row">
<p>test</p>
<span><strong>2</strong></span>
</div>
<div style="display: flex;flex-direction: row">
<p>test</p>
<span><strong>4</strong></span>
</div>
</div>
</div>
</body>
</html>
我尝试为 Maven 使用不同的 HTML 到 pdf 库，但无法达到预期的结果。我需要的是一个完全可配置的 Java css 和 html 到 pdf 转换器。
非常感谢您的帮助。
答： 暂无答案
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