Before the article

Use Thymeleaf to render HTML dynamically

1. Add dependencies

<! --> <dependency> <groupId>com.itextpdf</ artifactId> <version>5.4.2</version> </dependency> <dependency> <groupId>org.xhtmlrenderer</groupId> <artifactId>core-renderer</artifactId> <version>R8</version> </dependency>Copy the code

2. Coding tool classes

import com.itextpdf.text.pdf.BaseFont; import com.lowagie.text.DocumentException; import org.springframework.stereotype.Component; import org.xhtmlrenderer.pdf.ITextFontResolver; import org.xhtmlrenderer.pdf.ITextRenderer; import java.io.IOException; import java.io.OutputStream; /** * Export PDF file conversion tool */ public class PDFUtil{/** * generate PDF file * @param out output stream * @param HTML HTML string * @throws IOException Ioexception * @throws DocumentException DocumentException */ public static void createPDF(OutputStream out, String html) throws IOException, DocumentException { ITextRenderer renderer = new ITextRenderer(); renderer.setDocumentFromString(html); FontResolver = renderer.getfontresolver (); fontResolver.addFont("pdf/font/fangsong.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); fontResolver.addFont("pdf/font/PingFangSC.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); renderer.layout(); renderer.createPDF(out); }}Copy the code

The font file is downloaded and added to the resouces path, which is modified accordingly

3. Effect demonstration

Problems encountered and solutions

Maven packages the source code, causing the content of the HTML file to be tampered with

  • Cause: Placeholder ${} used by Maven plugin conflicts with Thymeleaf
  • Workaround: Configure resource files in pom.xml without processing placeholders for HTML files when packaging
<build>
    ...
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>true</filtering>
            <excludes>
                <exclude>**/*.html</exclude>
            </excludes>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <filtering>false</filtering>
            <includes>
                <include>**/*.html</include>
            </includes>
        </resource>
    </resources>
</build>Copy the code

2, use Docker image, download the file error, lack of font processing class

  • Use the image source Java :8 instead of OpenJDK :8-jre-alpine

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