Java导出根据模板PDF（Springboot+Adobe Acrobat）

1、使用Adobe Acrobat创建PDF模板（设置文本域），文本域命名对应Java实体类

2、引入依赖

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.5.13.3</version>
</dependency>

3、编写实现类和控制类

@Service
@Slf4j
public class PdfServiceImpl implements PdfService {
    @Override
    public void generator(Invoice invoice, HttpServletResponse response) throws UnsupportedEncodingException, FileNotFoundException {
        // 模板名称
        String templateName = "Invoice_elle_April2022模板.pdf";
        String path = "";
        // 获取操作系统名称，根据系统名称确定模板存放的路径
        String systemName = System.getProperty("os.name");
        if (systemName.toUpperCase().startsWith("WIN")) {
            path = "C:/Users/Administrator/Desktop/";
        }
        // 生成导出PDF的文件名称
        String fileName = "Invoice.pdf";
        fileName = URLEncoder.encode(fileName, "UTF-8");
        // 设置响应头
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment;fileName=" + fileName);
        OutputStream out = null;
        PdfReader reader = null;
        ByteArrayOutputStream bos;
        PdfStamper stamper;
        try {
            // 保存到本地
            // out = new FileOutputStream(fileName);
            // 输出到浏览器端
            out = response.getOutputStream();
            // 读取PDF模板表单
            reader = new PdfReader(path + templateName);
            // 字节数组流，用来缓存文件流
            bos = new ByteArrayOutputStream();
            // 根据模板表单生成一个新的PDF
            stamper = new PdfStamper(reader, bos);
            // 获取新生成的PDF表单
            AcroFields form = stamper.getAcroFields();
            // 给表单生成中文字体，这里采用系统字体，不设置的话，中文显示会有问题
            BaseFont font = BaseFont.createFont("C:/WINDOWS/Fonts/SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
            form.addSubstitutionFont(font);
            // 装配数据
            Map<String, Object> data = new HashMap<>(15);
            data.put("billedTo", invoice.getBilledTo());
            data.put("dateOfIssue", invoice.getDateOfIssue());
            data.put("invoiceNumber", invoice.getInvoiceNumber());
            data.put("amountDue", invoice.getAmountDue());
            data.put("description", invoice.getDescription());
            data.put("rate", invoice.getRate());
            data.put("qty", invoice.getQty());
            data.put("lineTotal", invoice.getLineTotal());
            data.put("total", invoice.getTotal());
            // 遍历data，给pdf表单赋值
            for (String key : data.keySet()) {
                form.setField(key, data.get(key).toString());
            }
            // 表明该PDF不可修改
            stamper.setFormFlattening(true);
            // 关闭资源
            stamper.close();
            // 将ByteArray字节数组中的流输出到out中（即输出到浏览器）
            Document doc = new Document();
            PdfCopy copy = new PdfCopy(doc, out);
            doc.open();
            PdfImportedPage importPage = copy.getImportedPage(new PdfReader(bos.toByteArray()), 1);
            copy.addPage(importPage);
            doc.close();
            log.info("*****************************PDF导出成功*********************************");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (out != null) {
                    out.flush();
                    out.close();
                }
                if (reader != null) {
                    reader.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

public interface PdfService {
    void generator(Invoice invoice, HttpServletResponse response) throws UnsupportedEncodingException, FileNotFoundException;
}

@RestController
@RequestMapping("/pdf")
public class PdfController {

    @Autowired
    private PdfService pdfService;

    @PostMapping("/export")
    public void generatorAdmissionCard(@RequestBody Invoice invoice, HttpServletResponse response) {
        try {
            pdfService.generator(invoice, response);
        } catch (UnsupportedEncodingException | FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

4、导出效果（字体和换行可在Adobe Acrobat中设置）

5、字体找不到问题（windows本地可以，线上环境报错）

问题代码

BaseFont font = BaseFont.createFont("C:/WINDOWS/Fonts/SIMSUN.TTC,1", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);

解决办法

1.引入依赖

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itext-asian</artifactId>
    <version>5.2.0</version>
</dependency>

2.上面代码改成

BaseFont font = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);

参考文章：
Java如何实现Pdf的导出？