springboot+mybitsplus如何存pdf文件到数据库,然后读取返回给客户端
时间: 2023-05-30 16:05:54 浏览: 158
可以通过以下步骤将PDF文件存储到数据库并从数据库读取并返回给客户端:
1. 创建一个包含PDF文件的实体类:
```java
@Entity
@Table(name = "pdf_table")
public class PdfEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "file_name")
private String fileName;
@Lob
@Column(name = "file_data")
private byte[] fileData;
// getters and setters
}
```
2. 创建一个包含保存和读取PDF文件的服务类:
```java
@Service
public class PdfService {
@Autowired
private PdfRepository pdfRepository;
public void savePdf(String fileName, byte[] fileData) {
PdfEntity pdfEntity = new PdfEntity();
pdfEntity.setFileName(fileName);
pdfEntity.setFileData(fileData);
pdfRepository.save(pdfEntity);
}
public ResponseEntity<ByteArrayResource> getPdf(Long id) throws IOException {
PdfEntity pdfEntity = pdfRepository.findById(id).orElseThrow(() -> new ResourceNotFoundException("PDF not found"));
ByteArrayResource resource = new ByteArrayResource(pdfEntity.getFileData());
HttpHeaders headers = new HttpHeaders();
headers.add(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=" + pdfEntity.getFileName());
headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_PDF_VALUE);
return ResponseEntity.ok()
.headers(headers)
.contentLength(resource.contentLength())
.body(resource);
}
}
```
3. 创建一个控制器来处理保存和读取PDF文件的请求:
```java
@RestController
@RequestMapping("/pdf")
public class PdfController {
@Autowired
private PdfService pdfService;
@PostMapping("/save")
public void savePdf(@RequestParam("file") MultipartFile file) throws IOException {
pdfService.savePdf(file.getOriginalFilename(), file.getBytes());
}
@GetMapping("/{id}")
public ResponseEntity<ByteArrayResource> getPdf(@PathVariable("id") Long id) throws IOException {
return pdfService.getPdf(id);
}
}
```
现在,当您将PDF文件上传到“/pdf/save”端点时,它将被存储在数据库中。您可以通过访问“/pdf/{id}”端点来读取并返回PDF文件。