Java html转pdf 且解决中文不显示问题

记录一下利用freemarker 将html转换pdf的教程

pom.xml引入包

<!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itextpdf</artifactId>
            <version>5.5.11</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.itextpdf.tool/xmlworker -->
        <dependency>
            <groupId>com.itextpdf.tool</groupId>
            <artifactId>xmlworker</artifactId>
            <version>5.5.11</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.xhtmlrenderer/flying-saucer-pdf -->
        <dependency>
            <groupId>org.xhtmlrenderer</groupId>
            <artifactId>flying-saucer-pdf</artifactId>
            <version>9.1.5</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.xhtmlrenderer/flying-saucer-pdf-itext5 -->
        <dependency>
            <groupId>org.xhtmlrenderer</groupId>
            <artifactId>flying-saucer-pdf-itext5</artifactId>
            <version>9.1.5</version>
        </dependency>


        <!-- 解决中文字体问题 -->
        <dependency>
            <groupId>com.itextpdf</groupId>
            <artifactId>itext-asian</artifactId>
            <version>5.2.0</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.freemarker/freemarker -->
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.19</version>
        </dependency>

解决中文不显示问题

package com.express.excms.enroll.config;

import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.tool.xml.XMLWorkerFontProvider;

/**
 * Created by IntelliJ IDEA.
 * User: 贝先 [ Cason mo ]
 * Date: 2021/11/12
 * Time: 14:46
 */
public class AsianFontProvider extends XMLWorkerFontProvider {
    @Override
    public Font getFont(String fontname, String encoding, float size, final int style) {
        try {
            BaseFont bfChinese =BaseFont.createFont( "STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
            return new Font(bfChinese, size, style);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return super.getFont(fontname, encoding, size, style);
    }
}

html转pdf

package com.express.excms.enroll.utils;

import com.express.excms.enroll.config.AsianFontProvider;
import com.itextpdf.text.Document;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.tool.xml.XMLWorkerHelper;
import lombok.extern.slf4j.Slf4j;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;

/**
 * Created by IntelliJ IDEA.
 * User: 贝先 [ Cason mo ]
 * Date: 2021/10/18
 * Time: 10:54
 */
@Slf4j
public class PDFUtils {
    /**
     * ByteArrayOutputStream pdf文件流
     * @param htmlContent 通过freemarker生成的html
     * @return
     * @throws Exception
     */
    public static ByteArrayOutputStream htmlToPdf(String htmlContent) throws Exception {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        Document document = new Document();
        PdfWriter pdfWriter = PdfWriter.getInstance(document, output);
        document.open();
        XMLWorkerHelper.getInstance().parseXHtml(pdfWriter,document,new ByteArrayInputStream(htmlContent.getBytes(StandardCharsets.UTF_8)),null, StandardCharsets.UTF_8,new AsianFontProvider());
        document.close();
        return output;
    }

    /**
     * 写入到文件
     * @param htmlContent 通过freemarker生成的html
     * @param filePath 要写入的pdf文件地址
     * @throws Exception
     */
    public static void htmlToPdf(String htmlContent,String filePath) throws Exception {
        Document document = new Document();
        PdfWriter pdfWriter = PdfWriter.getInstance(document, new FileOutputStream(filePath));
        document.open();
        XMLWorkerHelper.getInstance().parseXHtml(pdfWriter,document,new ByteArrayInputStream(htmlContent.getBytes(StandardCharsets.UTF_8)),null, StandardCharsets.UTF_8,new AsianFontProvider());
        document.close();
    }
}

freemarker 解析并获取生成的html

        @Autowired
        private Configuration configuration;


......省略



        Configuration cfg = (Configuration) configuration.clone();
        cfg.clearTemplateCache();
        Template t = new Template(templateInDB.getName(), new StringReader(未渲染的html), configuration);
        String html = FreeMarkerTemplateUtils.processTemplateIntoString(t, 要渲染的数据);
        try {
            ByteArrayOutputStream byteArrayOutputStream = PDFUtils.htmlToPdf(html);
            //获取pdf的base64
            byte[] bytes = byteArrayOutputStream.toByteArray();
       
        } catch (Exception e) {
            e.printStackTrace();
            return ResponseResult.defaultFailed(e.getMessage());
        }
    

效果图

编辑