[英]How to save generated PDF files to MySQL db using spring boot?
I have a function which is generating PDF file using iText libary.我有一个使用 iText 库生成 PDF 文件的功能。 My idea is that convert document to byte array but I always get a error: com.itextpdf.text.Document@2805d0d4. The file cannot be found
我的想法是将文档转换为字节数组,但我总是收到一个错误: com.itextpdf.text.Document@2805d0d4. The file cannot be found
com.itextpdf.text.Document@2805d0d4. The file cannot be found
. com.itextpdf.text.Document@2805d0d4. The file cannot be found
。
Here is my PDF generation function:这是我的 PDF 生成功能:
@Override
public Boolean createdPDF() throws Exception {
Document document = new Document();
PdfWriter.getInstance(document, new FileOutputStream("iTextHelloWorld.pdf"));
document.open();
Font font = FontFactory.getFont(FontFactory.COURIER, 16, BaseColor.BLACK);
Chunk chunk = new Chunk("Hello World", font);
document.add(chunk);
document.close();
getByteArrayFromFile(document);
return true;
}
Here is my convert byte array from file function:这是我从文件函数转换字节数组:
private byte[] getByteArrayFromFile(Document handledDocument) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream in = new FileInputStream(String.valueOf(handledDocument));
byte[] buffer = new byte[500];
int read = -1;
while ((read = in.read(buffer)) > 0) {
baos.write(buffer, 0, read);
}
in.close();
Ticket newTicket = new Ticket();
newTicket.setFileName("example");
newTicket.setData(baos.toByteArray());
ticketRepository.save(newTicket);
return baos.toByteArray();
}
Ticket entity:票务实体:
@Data
@Entity
public class Ticket {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String fileName;
@Lob
private byte[] data;
@NotNull
@JsonIgnore
@Column(updatable = false)
private LocalDateTime createAt;
@NotNull
@JsonIgnore
private LocalDateTime updatedAt;
}
Here is an example how you can get a byte[] from PdfDocument:以下是如何从 PdfDocument 获取 byte[] 的示例:
ByteArrayOutputStream baos = new ByteArrayOutputStream();
Documentdocument = new Document();
PdfWriter pdfWriter = PdfWriter.getInstance(document, baos);
document.open();
Font font = FontFactory.getFont(FontFactory.COURIER, 16, BaseColor.BLACK);
Chunk chunk = new Chunk("Hello World", font);
document.add(chunk);
document.close();
pdfWriter.flush();
byte[] pdfAsBytes = baos.toByteArray();
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