java 如何使用 thymeleaf 作为模板引擎生成 pdf 报告？
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How to generate pdf report using thymeleaf as template engine?
提问by Anindya Chatterjee
I want to create pdf report in a spring mvc application. I want to use themeleaf for designing the html report page and then convert into pdf file. I don't want to use xlst for styling the pdf. Is it possible to do that way?
我想在 spring mvc 应用程序中创建 pdf 报告。我想使用themeleaf来设计html报告页面，然后转换成pdf文件。我不想使用 xlst 来设置 pdf 的样式。有可能这样做吗？
Note: It is a client requirement.
注意：这是客户的要求。
采纳答案by Vijay
You can use SpringTemplateEngineprovided by thymeleaf. Below is the dependency for it:
您可以使用SpringTemplateEnginethymeleaf 提供的。下面是它的依赖：
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring4</artifactId>
</dependency>
Below is the implementation I have done to generate the PDF:
以下是我为生成 PDF 所做的实现：
@Autowired
SpringTemplateEngine templateEngine;
public File exportToPdfBox(Map<String, Object> variables, String templatePath, String out) {
try (OutputStream os = new FileOutputStream(out);) {
// There are more options on the builder than shown below.
PdfRendererBuilder builder = new PdfRendererBuilder();
builder.withHtmlContent(getHtmlString(variables, templatePath), "file:");
builder.toStream(os);
builder.run();
} catch (Exception e) {
logger.error("Exception while generating pdf : {}", e);
}
return new File(out);
}
private String getHtmlString(Map<String, Object> variables, String templatePath) {
try {
final Context ctx = new Context();
ctx.setVariables(variables);
return templateEngine.process(templatePath, ctx);
} catch (Exception e) {
logger.error("Exception while getting html string from template engine : {}", e);
return null;
}
}
You can store the file in Java temp directory shown below and send the file wherever you want:
您可以将文件存储在如下所示的 Java 临时目录中，并将文件发送到您想要的任何位置：
System.getProperty("java.io.tmpdir");
Note: Just make sure you delete the file once used from the temp directory if your frequency of generating the pdf is high.
注意：如果您生成 pdf 的频率很高，请确保从临时目录中删除曾经使用过的文件。
回答by SilentICE
You'll need to use something like flying-saucer-pdf, create a component a bit like:
您需要使用类似 fly-saucer-pdf 的东西，创建一个类似以下的组件：
@Component
public class PdfGenaratorUtil {
@Autowired
private TemplateEngine templateEngine;
public void createPdf(String templateName, Map<String, Object> map) throws Exception {
Context ctx = new Context();
Iterator itMap = map.entrySet().iterator();
while (itMap.hasNext()) {
Map.Entry pair = (Map.Entry) itMap.next();
ctx.setVariable(pair.getKey().toString(), pair.getValue());
}
String processedHtml = templateEngine.process(templateName, ctx);
FileOutputStream os = null;
String fileName = UUID.randomUUID().toString();
try {
final File outputFile = File.createTempFile(fileName, ".pdf");
os = new FileOutputStream(outputFile);
ITextRenderer renderer = new ITextRenderer();
renderer.setDocumentFromString(processedHtml);
renderer.layout();
renderer.createPDF(os, false);
renderer.finishPDF();
}
finally {
if (os != null) {
try {
os.close();
} catch (IOException e) { /*ignore*/ }
}
}
}
}
Then simply @Autowirethis component in to your controller/service component and do something like:
然后@Autowire将此组件简单地添加到您的控制器/服务组件中并执行以下操作：
Map<String,String> data = new HashMap<String,String>();
data.put("name","James");
pdfGenaratorUtil.createPdf("greeting",data);
where "greeting"is the name of your template
"greeting"你的模板名称在哪里
See http://www.oodlestechnologies.com/blogs/How-To-Create-PDF-through-HTML-Template-In-Spring-Bootfor details
有关详细信息，请参阅http://www.oodlestechnologies.com/blogs/How-To-Create-PDF-through-HTML-Template-In-Spring-Boot
