Spring Boot Freemark HTML 生成 PDF

    org.xhtmlrenderer
    flying-saucer-pdf
    9.1.16



    com.itextpdf
    itextpdf
    5.5.13




    org.freemarker
    freemarker
    2.3.31

 templates.ftl 放入resource文件中

simsun.ttc 为字体文件

1. HttpHeaders 写法

@GetMapping("/pdf")
    public ResponseEntity export(HttpServletResponse response) {
        try {
            HttpHeaders headers = new HttpHeaders();
            Map dataMap = new HashMap<>(16);
            dataMap.put("userName", "张三");
            String htmlStr = PDFUtil.freemarkerRender(dataMap, "templates.ftl");
            byte[] pdfBytes = PDFUtil.createPDF(htmlStr, "simsun.ttc");
            if (pdfBytes != null && pdfBytes.length > 0) {
                String fileName = System.currentTimeMillis() + (int) (Math.random() * 90000 + 10000) + ".pdf";
                headers.setContentDispositionFormData("attachment", fileName);
                headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
                return new ResponseEntity(pdfBytes, headers, HttpStatus.OK);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON_UTF8);
        return new ResponseEntity<>("{ "code" : "404", "message" : "not found" }", headers, HttpStatus.NOT_FOUND);
    }

 2. Response 写法

@GetMapping("/pdf")
    public void export(HttpServletResponse response) {
        ServletOutputStream outputStream = null;
        InputStream inputStream = null;
        try {
            // 设置参数
            Map dataMap = new HashMap<>(16);
            dataMap.put("text", "
姓名：张三
日期：2022/08/10
");
            String htmlStr = PDFUtil.freemarkerRender(dataMap, "templates.ftl");
            byte[] pdfBytes = PDFUtil.createPDF(htmlStr, "simsun.ttc");
            // 获取输出流
            outputStream = response.getOutputStream();
            if (pdfBytes != null && pdfBytes.length > 0) {
                // 设置文件名
                String fileName = System.currentTimeMillis() + (int) (Math.random() * 90000 + 10000) + ".pdf";
                response.setHeader("content-Type", "application/octet-stream");
                response.setCharacterEncoding("utf-8");
                response.setHeader("Content-disposition", "attachment;filename=" + fileName);
                // 写入输出流
                outputStream.write(pdfBytes);
                // 获取输入流
                inputStream = new ByteArrayInputStream(pdfBytes);
                // 输入流保存阿里云
                final String upload = OssBootUtil.upload(inputStream, "upload/agree/" + fileName);
            }
        } catch (Exception e) {
            e.printStackTrace();
            try {
                if (outputStream != null) {
                    outputStream.close();
                }
                if (inputStream != null) {
                    inputStream.close();
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }

import com.dpxdata.backend.report.util.ResourceFileUtil;
import com.lowagie.text.DocumentException;
import com.lowagie.text.pdf.BaseFont;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateExceptionHandler;
import org.xhtmlrenderer.pdf.ITextFontResolver;
import org.xhtmlrenderer.pdf.ITextRenderer;

import java.io.*;
import java.util.Map;


public class PDFUtil {
    private PDFUtil(){}

    private volatile static Configuration configuration;

    static {
        if (configuration == null) {
            synchronized (PDFUtil.class) {
                if (configuration == null) {
                    configuration = new Configuration(Configuration.VERSION_2_3_28);
                }
            }
        }
    }

    
    public static String freemarkerRender(Map dataMap, String ftlFilePath) {
        Writer out = new StringWriter();
        configuration.setDefaultEncoding("UTF-8");
        configuration.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
        try {
            configuration.setDirectoryForTemplateLoading(new File(ResourceFileUtil.getParent(ftlFilePath)));
            configuration.setLogTemplateExceptions(false);
            configuration.setWrapUncheckedExceptions(true);
            Template template = configuration.getTemplate(ResourceFileUtil.getFileName(ftlFilePath));
            template.process(dataMap, out);
            out.flush();
            return out.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (TemplateException e) {
            e.printStackTrace();
        } finally {
            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }

    
    public static byte[] createPDF(String htmlTmpStr, String fontFile) {
        ByteArrayOutputStream outputStream = null;
        byte[] result = null;
        try {
            outputStream = new ByteArrayOutputStream();
            ITextRenderer renderer = new ITextRenderer();
            renderer.setDocumentFromString(htmlTmpStr);
            ITextFontResolver fontResolver = renderer.getFontResolver();
            // 解决中文支持问题,需要所需字体(ttc)文件
            fontResolver.addFont(ResourceFileUtil.getAbsolutePath(fontFile),BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED);
            renderer.layout();
            renderer.createPDF(outputStream);
            result=outputStream.toByteArray();
            if(outputStream != null) {
                outputStream.flush();
                outputStream.close();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

}

    
    
    





    

        
            
            
            
            
            
        

        

            

                
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${userName!''}
                
${text!''}