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Java 使用FlyingSaucer从HTML模板生成PDF证书时，背景周围出现白色边框

我需要在完成课程后生成PDF证书.这些pdf是由带有百里叶的HTML模板生成的.通过转换一切正常，但结果显示背景图像周围出现白色边框.背景图像分辨率为1920x1440. 下面是我在Spring Boot 3.1.0上的代码:

public String parseThymeleafTemplate(String verificationCode, Long certificateId) {
        ClassLoaderTemplateResolver templateResolver = new ClassLoaderTemplateResolver();
        templateResolver.setSuffix(".html");
        templateResolver.setTemplateMode(TemplateMode.HTML);

        TemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(templateResolver);

        User student = User.builder()
                .surname("Test_surname").name("Test_name").build();
        User mentor = User.builder()
                .surname("Test_mentor").name("Test_mentor").position("Java dev").build();
        Course course = Course.builder()
                .mentor(mentor)
                .name("Java Developer for 3 weeks").build();
        }

        Certificate certificate = Certificate.builder()
                .id(54L)
                .course(course)
                .student(student)
                .verificationCode(verificationCode)
                .issuedDate(LocalDate.now())
                .build();
        Context context = new Context();
        context.setVariable("company_name", "test_company");
        context.setVariable("student_name", certificate.getStudent().getSurname() + " " + certificate.getStudent().getName());
        context.setVariable("course_name", certificate.getCourse().getName());
        context.setVariable("mentor_name", certificate.getCourse().getMentor().getSurname() + " " + certificate.getCourse().getMentor().getName());
        context.setVariable("issued_date", certificate.getIssuedDate());
        context.setVariable("verification_code", certificate.getVerificationCode());
        String generatedFileName = this.generatePdfFromHtml(templateEngine.process("pdf_cert_temp", context),
                "Java", certificate);
        certificate.setFileName(generatedFileName);
        return generatedFileName;
    }

    public String generatePdfFromHtml(String html, String courseTag, Certificate certificate) {
        String fileName = courseTag + "_" +
                transliterateUtil.transliterateTextFromRussianToLatin(certificate.getStudent().getName()) + "_" +
                certificate.getIssuedDate().toString() + "_" + certificate.getId() +
                CertStrings.CERT_EXTENSION;
        String outputFolder = CertStrings.PATH_TO_PDF_CERTS + File.separator + fileName;
        try (OutputStream outputStream = new FileOutputStream(outputFolder)) {
            ITextRenderer renderer = new ITextRenderer();
            renderer.setDocumentFromString(html);
            renderer.layout();
            renderer.createPDF(outputStream);
        } catch (IOException e) {
            throw new RuntimeException(CertStrings.ERROR_WHILE_OUTPUT_STREAM + e);
        } catch (DocumentException e) {
            throw new RuntimeException(CertStrings.ERROR_CREATING_PDF + e);
        }
        return fileName;
    }

这是我的Thymeleaf模板，用于创建PDF

<html xmlns:th="http://www.thymeleaf.org">
<head>
    <style th:inline="text">
        @page {
            size: 1920px 1440px;
        }

        body {
            font-family: Arial, sans-serif;
            background-image: url(http://some_url/files/cert_templates/java_template_bg.jpg);
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            width: 100%;
            height: 100%;
            margin: 0px;
            padding: 0px;
            box-sizing: border-box;
        }

        .company-name {
            text-align: center;
            color: #D9AF58;
            font-style: italic;
            font-size: 70px;
            font-weight: 100;
            position: absolute;
            margin-top: 5%;
            left: 44%;
        }

        .student-name {
            text-align: center;
            color: #D9AF58;
            font-family: "Times New Roman", Times, serif;
            font-size: 70px;
            font-weight: 100;
            position: absolute;
            margin-top: 31%;
            left: 38.5%;
        }

        .course-completing {
            text-align: center;
            color: #D9AF58;
            font-family: "Times New Roman", Times, serif;
            font-weight: 100;
            font-size: 51px;
            position: absolute;
            margin-top: 36%;
            left: 30%;
        }

        .course-description {
            text-align: center;
            color: #D9AF58;
            font-family: "Times New Roman", Times, serif;
            font-size: 50px;
            font-weight: 100;
            position: absolute;
            margin-top: 40%;
            left: 35%;
        }

        .mentor-name {
            text-align: center;
            color: #D9AF58;
            font-family: "Times New Roman", Times, serif;
            font-size: 30px;
            font-weight: 100;
            position: absolute;
            margin-top: 44%;
            left: 39%;
        }

        .verification-code {
            text-align: center;
            color: #D9AF58;
            font-size: 25px;
            font-weight: 100;
            position: absolute;
            margin-top: 46%;
            left: 34.5%;
        }

        .issued-date {
            text-align: left;
            color: #D9AF58;
            font-size: 50px;
            font-weight: 100;
            position: absolute;
            margin-top: 55%;
            left: 21.1%;
        }

        .signature {
            text-align: left;
            color: #D9AF58;
            font-size: 50px;
            font-weight: 100;
            position: absolute;
            margin-top: 55%;
            right: 21.5%;
        }
    </style>

</head>
<body>
<div>
    <div class="company-name">
        <span th:text="${company_name}"></span>
    </div>
    <div class="student-name">
        <span th:text="${student_name}"></span>
    </div>
    <div class="course-completing">
        <span>has successfully completing course</span>
    </div>
    <div class="course-description">
        <u th:text="${course_name}"></u>
    </div>
    <div class="mentor-name">
        Taught by <span th:text="${mentor_name}"></span>
    </div>
    <div class="verification-code">
        Verification code: <span th:text="${verification_code}"></span>
    </div>
    <div>
        <div class="issued-date">
            <span th:text="${issued_date}"></span>
        </div>
        <div class="signature">
            <span th:text="'Test S.'"></span>
        </div>
    </div>
</div>
</body>
</html>

这是我的pom.xml:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>PdfGeneratorTest</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>PdfGeneratorTest</name>
    <description>PdfGeneratorTest</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.ibm.icu</groupId>
            <artifactId>icu4j</artifactId>
            <version>69.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.xhtmlrenderer</groupId>
            <artifactId>flying-saucer-pdf</artifactId>
            <version>9.1.22</version>
        </dependency>
        <dependency>
            <groupId>ognl</groupId>
            <artifactId>ognl</artifactId>
            <version>3.2.10</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.12.0</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

这是一个示例，如下所示: Example of generated PDF个

try 修改HTMLtempalte，但不起作用.调整图像或输出页面的大小也不起作用.

推荐答案

这是正常的打印行为，它只是添加正常的打印机"卡爪边距"(这样油墨就不会污染滚筒).您将需要添加css以将打印机介质边距减少到"无边框"

enter image description here

一种方法是将正文的@Media Print设置为Zer0

enter image description here

这可能不会精确地删除所有白色区域(没有微小的像素或两个变化)，因为zoom 比例通常会有一些单位舍入，这可能会因浏览器而异，并且通常取决于当前页面zoom .

下面是我用来减小打印机边框的粗略值

<head>
    <style th:inline="text">
        @media print {
        @page {
        size: 1920px 1440px;
        border: 0px;
        margin: 0px;
        padding: 0px;
        }
        }

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