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

        
            com.itextpdf
            itextpdf
            5.5.11
        
        
        
            com.itextpdf.tool
            xmlworker
            5.5.11
        
        
        
            org.xhtmlrenderer
            flying-saucer-pdf
            9.1.5
        

        
        
            org.xhtmlrenderer
            flying-saucer-pdf-itext5
            9.1.5
        


        
        
            com.itextpdf
            itext-asian
            5.2.0
        

        
        
            org.freemarker
            freemarker
            2.3.19
        

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;


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;


@Slf4j
public class PDFUtils {
    
    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;
    }

    
    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