Java HTML转PDF（Freemarker）Copy就能用。

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引入pom.xml依赖。

    org.springframework.boot
    spring-boot-starter-freemarker



    com.itextpdf
    itextpdf
    5.5.11


    com.itextpdf.tool
    xmlworker
    5.5.11


    com.itextpdf
    itext-asian
    5.2.0

在【resources】目录下，创建一个文件夹【templates】并在该目录下创建一个ftl文件。

demo.ftl文件内容：

    
    



abcdefg

    

        
药品名称
        
类型
    
    

        
${name}
        
${type}
    

写一个PDF转换工具类。

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;
import com.itextpdf.tool.xml.XMLWorkerHelper;
import freemarker.template.Configuration;
import freemarker.template.TemplateException;
import org.springframework.ui.freemarker.FreeMarkerTemplateUtils;
import org.xhtmlrenderer.pdf.ITextFontResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.nio.charset.Charset;


public class HtmlConvertPdfHelper {
    Configuration configuration;

    
    public HtmlConvertPdfHelper() {
        if (configuration == null) {
            configuration = BeanHelper.getBean(Configuration.class);
        }
    }

    
    public byte[] htmlConvertPDF(String fileName, Object map) throws IOException, TemplateException, DocumentException {
        String htmlText = FreeMarkerTemplateUtils.processTemplateIntoString(configuration.getTemplate(fileName), map);
        return htmlConvertPDF(htmlText);
    }

    
    public byte[] htmlConvertPDF(String htmText) throws DocumentException, IOException {
        //最终返回的byte流
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        //第一步，创建一个 iTextSharp.text.Document对象的实例：
        Document document = new Document();
        //第二步，为该Document创建一个Writer实例：
        PdfWriter writer = PdfWriter.getInstance(document, byteArrayOutputStream);
        //第三步，打开当前Document
        document.open();
        XMLWorkerHelper.getInstance().parseXHtml(writer, document, new ByteArrayInputStream(htmText.getBytes()), null, Charset.defaultCharset(), new AsianFontProvider());
        document.close();
        return byteArrayOutputStream.toByteArray();
    }
}


class AsianFontProvider extends XMLWorkerFontProvider {
    @Override
    public Font getFont(final String fontname, String encoding, float size, int style) {
        try {
            BaseFont bfChinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
            return new Font(bfChinese, size, style);
        } catch (Exception e) {
        }
        return super.getFont(fontname, encoding, size, style);
    }
}

写测试类测试功能是否可用。

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
@RunWith(SpringRunner.class)
@Slf4j
public class Test {
    @org.junit.Test
    public void aaa() throws IOException, TemplateException, com.itextpdf.text.DocumentException {
        Map map = new HashMap<>();
        map.put("name", "鹤顶红");
        map.put("type", "毒药");
    
        byte[] bytes = new HtmlConvertPdfHelper().htmlConvertPDF("demo.ftl", map);
        System.out.println(bytes);
    
        OutputStream os = new FileOutputStream("G:/text.pdf");
        os.write(bytes, 0, bytes.length);
        os.flush();
        os.close();
    }
}

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