徽标不会显示在thymleaf html模板中，尤其是在下载pdf文件时

Question

我正在使用胸腺叶html模板在Spring启动中使用java生成pdf。徽标和图像未加载。它会抛出错误。请参阅下面附加的代码和错误。

注意：但是图像正在加载用于预览和打印界面。仅用于下载，我面临一个问题。文件位置：user：/src/main/Resources/静态/图像$lslogo.pnguser-image-2.jpg

//代码

<div class="logo">
   <img th:src="@{/images/logo.png}" />
</div> 
   <img class="profilepic" th:src="@{/images/user-image-2.jpg}">

//生成pdf的代码

 public File generatePdf(String id) throws Exception {
        Context context = initProfileContext(id);
        String html = loadAndFillTemplate(context);
        return renderPdf(id, html);
    }

    private File renderPdf(String id, String html) throws Exception {
        File file = File.createTempFile("profile_" + id, ".pdf");
        OutputStream outputStream = new FileOutputStream(file);
        ITextRenderer renderer = new ITextRenderer(20f * 4f / 3f, 20);
        renderer.setDocumentFromString(html);
        renderer.layout();
        renderer.createPDF(outputStream);
        outputStream.close();
        file.deleteOnExit();
        return file;
    }

    private Context initProfileContext(String id) {
        Context context = new Context();
        context.setVariable("profile", profileService.findById(id));
        return context;
    }

    private String loadAndFillTemplate(Context context) {
        return templateEngine.process("profile", context);
    }

//错误

2020-10-29 16:53:13.799 ERROR 26176 --- [nio-5555-exec-2] org.thymeleaf.TemplateEngine             : [THYMELEAF][http-nio-5555-exec-2] Exception processing template "profile": Link base "/images/logo.png" cannot be context relative (/...) unless the context used for executing the engine implements the org.thymeleaf.context.IWebContext interface (template: "profile" - line 66, col 6)

org.thymeleaf.exceptions.TemplateProcessingException: Link base "/images/logo.png" cannot be context relative (/...) unless the context used for executing the engine implements the org.thymeleaf.context.IWebContext interface (template: "profile" - line 66, col 6)
        at org.thymeleaf.linkbuilder.StandardLinkBuilder.computeContextPath(StandardLinkBuilder.java:493) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.linkbuilder.StandardLinkBuilder.buildLink(StandardLinkBuilder.java:126) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.context.AbstractEngineContext.buildLink(AbstractEngineContext.java:167) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.standard.expression.LinkExpression.executeLinkExpression(LinkExpression.java:290) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.standard.expression.SimpleExpression.executeSimple(SimpleExpression.java:85) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.standard.expression.Expression.execute(Expression.java:109) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.standard.expression.Expression.execute(Expression.java:138) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.standard.processor.AbstractStandardExpressionAttributeTagProcessor.doProcess(AbstractStandardExpressionAttributeTagProcessor.java:144) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.processor.element.AbstractAttributeTagProcessor.doProcess(AbstractAttributeTagProcessor.java:74) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.processor.element.AbstractElementTagProcessor.process(AbstractElementTagProcessor.java:95) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.util.ProcessorConfigurationUtils$ElementTagProcessorWrapper.process(ProcessorConfigurationUtils.java:633) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.engine.ProcessorTemplateHandler.handleStandaloneElement(ProcessorTemplateHandler.java:918) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.engine.StandaloneElementTag.beHandled(StandaloneElementTag.java:228) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.engine.TemplateModel.process(TemplateModel.java:136) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:592) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1059) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1048) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
        at com.palmtree.matrimony.service.ProfilePdfService.loadAndFillTemplate(ProfilePdfService.java:50) ~[main/:na]
        at com.palmtree.matrimony.service.ProfilePdfService.generatePdf(ProfilePdfService.java:27) ~[main/:na]
org.thymeleaf.exceptions.TemplateProcessingException: Link base "/images/logo.png" cannot be context relative (/...) unless the context used for executing the engine implements the org.thymeleaf.context.IWebContext interface (template: "profile" - line 66, col 6)
        at org.thymeleaf.linkbuilder.StandardLinkBuilder.computeContextPath(StandardLinkBuilder.java:493)
        at com.palmtree.matrimony.controller.ProfileController.download(ProfileController.java:93) ~[main/:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
        at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE]
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138) ~[spring-web-5.2.9

Answer 1

使用Springbootclasspath前缀。

例子：

<img class="profilepic" th:src="@{classpath:images/user-image-2.jpg}">

裁判：https://stackoverflow.com/a/47907375/3427462