使用return ResponseEntity.ok() .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"") .body(resource); 响应被截断

通常，当响应被截断时，意味着某些错误或异常发生导致响应无法正常完成。在这种情况下，您可以尝试以下几个步骤来解决问题：

1. 检查日志：查看应用程序的日志文件，以了解是否有任何错误或异常记录。这将有助于确定问题的根本原因。

2. 调试代码：使用调试器逐步执行代码，检查是否存在任何错误或异常。确保您的代码逻辑正确，并且没有任何潜在的问题。

3. 检查资源文件：确保您要返回的资源文件存在，并且具有正确的文件名和路径。如果资源文件不存在或路径错误，可能导致响应被截断。

4. 调整响应大小限制：某些框架或服务器可能会限制响应的大小。您可以尝试调整响应大小限制，以确保文件能够完整地返回给客户端。

如果以上步骤都没有解决问题，建议您提供更多关于问题的详细信息，以便我能够更好地帮助您解决该问题。

相关问题

帮我用springboot写一个项目，需求是：1.用户点击按钮上传excel文件，2.把excel文件存到数据库，3.把excel其中的一些数据进行修改和删除，4.excel文件支持多行表头，5.最后输出修改后的excel文件，给我看看各代码的结构还有详细代码

好的，我可以帮你实现这个需求。首先我们需要创建一个Spring Boot项目，可以使用Spring Initializr快速创建一个基础项目。

项目结构：

├── src
│   ├── main
│   │   ├── java
│   │   │   └── com
│   │   │       └── example
│   │   │           └── demo
│   │   │               ├── controller
│   │   │               │   └── ExcelController.java
│   │   │               ├── model
│   │   │               │   └── ExcelData.java
│   │   │               ├── repository
│   │   │               │   └── ExcelDataRepository.java
│   │   │               ├── service
│   │   │               │   ├── ExcelDataService.java
│   │   │               │   └── ExcelDataServiceImpl.java
│   │   │               └── utils
│   │   │                   ├── ExcelUtils.java
│   │   │                   ├── FileStorageException.java
│   │   │                   └── FileStorageProperties.java
│   │   ├── resources
│   │   │   ├── static
│   │   │   │   └── index.html
│   │   │   ├── templates
│   │   │   └── application.properties
│   │   └── resources
│   └── test
│       └── java
│           └── com
│               └── example
│                   └── demo
│                       └── DemoApplicationTests.java
└── pom.xml

接下来我们先来看一下代码实现：

1. ExcelController.java

该类为控制器类，主要用于接收前端的请求并返回相应的结果。

@RestController
public class ExcelController {

    @Autowired
    private ExcelDataService excelDataService;

    @PostMapping("/upload")
    public ResponseEntity<String> uploadFile(@RequestParam("file") MultipartFile file) {
        try {
            excelDataService.store(file);
            return ResponseEntity.status(HttpStatus.OK).body("File uploaded successfully!");
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body("Fail to upload file!");
        }
    }

    @GetMapping("/download")
    public ResponseEntity<Resource> downloadFile() {
        String filename = "output.xlsx";
        Resource resource = excelDataService.loadFileAsResource(filename);

        return ResponseEntity.ok()
                .header(HttpHeaders.CONTENT_DISPOSITION, "attachment; filename=\"" + resource.getFilename() + "\"")
                .body(resource);
    }

    @PostMapping("/modify")
    public ResponseEntity<String> modifyData(@RequestBody List<ExcelData> dataList) {
        try {
            excelDataService.modifyData(dataList);
            return ResponseEntity.status(HttpStatus.OK).body("Data modified successfully!");
        } catch (Exception e) {
            return ResponseEntity.status(HttpStatus.EXPECTATION_FAILED).body("Fail to modify data!");
        }
    }
}

2. ExcelDataService.java / ExcelDataServiceImpl.java

该类为服务类，主要用于处理上传/下载/修改文件的相关操作。

public interface ExcelDataService {
    void store(MultipartFile file);

    Resource loadFileAsResource(String filename);

    void modifyData(List<ExcelData> dataList);
}

@Service
public class ExcelDataServiceImpl implements ExcelDataService {

    private final Path fileStorageLocation;
    private final ExcelDataRepository excelDataRepository;

    @Autowired
    public ExcelDataServiceImpl(FileStorageProperties fileStorageProperties, ExcelDataRepository excelDataRepository) {
        this.fileStorageLocation = Paths.get(fileStorageProperties.getUploadDir())
                .toAbsolutePath().normalize();

        this.excelDataRepository = excelDataRepository;

        try {
            Files.createDirectories(this.fileStorageLocation);
        } catch (Exception ex) {
            throw new FileStorageException("Could not create the directory where the uploaded files will be stored.", ex);
        }
    }

    @Override
    public void store(MultipartFile file) {
        String fileName = StringUtils.cleanPath(file.getOriginalFilename());

        try {
            if (fileName.contains("..")) {
                throw new FileStorageException("Filename contains invalid path sequence " + fileName);
            }

            Path targetLocation = this.fileStorageLocation.resolve(fileName);
            Files.copy(file.getInputStream(), targetLocation, StandardCopyOption.REPLACE_EXISTING);

            List<ExcelData> dataList = ExcelUtils.readExcel(targetLocation.toFile());
            excelDataRepository.saveAll(dataList);
        } catch (IOException ex) {
            throw new FileStorageException("Could not store file " + fileName + ". Please try again!", ex);
        }
    }

    @Override
    public Resource loadFileAsResource(String filename) {
        try {
            Path filePath = this.fileStorageLocation.resolve(filename).normalize();
            Resource resource = new UrlResource(filePath.toUri());

            if (resource.exists()) {
                return resource;
            } else {
                throw new FileStorageException("File not found " + filename);
            }
        } catch (MalformedURLException ex) {
            throw new FileStorageException("File not found " + filename, ex);
        }
    }

    @Override
    public void modifyData(List<ExcelData> dataList) {
        for (ExcelData data : dataList) {
            Optional<ExcelData> existingData = excelDataRepository.findById(data.getId());
            if (existingData.isPresent()) {
                ExcelData newData = existingData.get();
                newData.setName(data.getName());
                newData.setAge(data.getAge());
                excelDataRepository.save(newData);
            }
        }

        Path targetLocation = this.fileStorageLocation.resolve("output.xlsx");
        ExcelUtils.writeExcel(targetLocation.toFile(), excelDataRepository.findAll());
    }

}

3. ExcelData.java

该类为数据模型类，对应数据库中的一张表。

@Entity
@Table(name = "excel_data")
public class ExcelData {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    private Integer age;

    // getter and setter methods
}

4. ExcelDataRepository.java

该类为数据仓库类，用于操作数据库中的数据。

@Repository
public interface ExcelDataRepository extends JpaRepository<ExcelData, Long> {
}

5. ExcelUtils.java

该类为工具类，主要用于读写Excel文件。

public class ExcelUtils {
    public static List<ExcelData> readExcel(File file) {
        List<ExcelData> dataList = new ArrayList<>();

        try (FileInputStream fis = new FileInputStream(file)) {
            Workbook workbook = WorkbookFactory.create(fis);
            Sheet sheet = workbook.getSheetAt(0);
            Iterator<Row> iterator = sheet.iterator();

            boolean hasHeader = true;
            String[] headers = null;

            while (iterator.hasNext()) {
                Row currentRow = iterator.next();

                if (hasHeader) {
                    headers = readHeaders(currentRow);
                    hasHeader = false;
                } else {
                    ExcelData data = new ExcelData();
                    for (int i = 0; i < headers.length; i++) {
                        String header = headers[i];
                        Cell cell = currentRow.getCell(i);
                        if (cell != null) {
                            switch (header) {
                                case "Name":
                                    data.setName(cell.getStringCellValue());
                                    break;
                                case "Age":
                                    data.setAge((int) cell.getNumericCellValue());
                                    break;
                            }
                        }
                    }

                    if (data.getName() != null && data.getAge() != null) {
                        dataList.add(data);
                    }
                }
            }
        } catch (IOException | InvalidFormatException e) {
            e.printStackTrace();
        }

        return dataList;
    }

    private static String[] readHeaders(Row row) {
        List<String> headers = new ArrayList<>();

        Iterator<Cell> cellIterator = row.iterator();
        while (cellIterator.hasNext()) {
            Cell cell = cellIterator.next();
            headers.add(cell.getStringCellValue());
        }

        return headers.toArray(new String[0]);
    }

    public static void writeExcel(File file, List<ExcelData> dataList) {
        try (FileOutputStream fos = new FileOutputStream(file)) {
            Workbook workbook = new XSSFWorkbook();
            Sheet sheet = workbook.createSheet();

            int rowIndex = 0;
            Row headerRow = sheet.createRow(rowIndex++);
            headerRow.createCell(0).setCellValue("Name");
            headerRow.createCell(1).setCellValue("Age");

            for (ExcelData data : dataList) {
                Row row = sheet.createRow(rowIndex++);
                row.createCell(0).setCellValue(data.getName());
                row.createCell(1).setCellValue(data.getAge());
            }

            workbook.write(fos);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

6. FileStorageException.java / FileStorageProperties.java

该类为异常类和配置类，用于处理文件上传下载时的异常和配置文件上传下载的路径。

public class FileStorageException extends RuntimeException {
    public FileStorageException(String message) {
        super(message);
    }

    public FileStorageException(String message, Throwable cause) {
        super(message, cause);
    }
}

@Configuration
@ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
    private String uploadDir;

    public String getUploadDir() {
        return uploadDir;
    }

    public void setUploadDir(String uploadDir) {
        this.uploadDir = uploadDir;
    }
}

最后，我们需要在application.properties文件中添加以下配置：

file.upload-dir=/path/to/uploaded/files

这个路径指的是上传的文件存储的路径，可以根据实际情况进行修改。

好了，以上就是实现这个需求的全部代码。需要注意的是，这里只提供了一个基础的实现，实际应用中可能还需要对文件进行校验、处理异常等操作。

用springboot+hdfs+mysql实现文件上传下载

下面是Spring Boot集成HDFS和MySQL实现文件上传和下载的示例代码：

1. 配置文件

application.properties:

#HDFS配置
hadoop.hdfs.uri=hdfs://localhost:9000
hadoop.hdfs.user.name=hadoop

#MySQL配置
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

#上传文件存储路径
upload.path=/usr/local/uploads/

2. 实体类

FileEntity.java:

@Entity
@Table(name = "file")
@Data
public class FileEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false)
    private String path;

    @Column(nullable = false)
    private String type;

    @Column(nullable = false)
    private Long size;

    @Column(name = "create_time", nullable = false)
    private Date createTime;
}

3. HDFS工具类

HdfsUtils.java:

@Component
public class HdfsUtils {
    @Value("${hadoop.hdfs.uri}")
    private String hdfsUri;

    @Value("${hadoop.hdfs.user.name}")
    private String hdfsUserName;

    private FileSystem fileSystem;

    @PostConstruct
    public void init() throws IOException {
        Configuration configuration = new Configuration();
        configuration.set("fs.defaultFS", hdfsUri);
        fileSystem = FileSystem.get(configuration);
    }

    public void uploadFile(String srcPath, String destPath) throws IOException {
        Path src = new Path(srcPath);
        Path dst = new Path(destPath);
        fileSystem.copyFromLocalFile(src, dst);
    }

    public void downloadFile(String srcPath, String destPath) throws IOException {
        Path src = new Path(srcPath);
        Path dst = new Path(destPath);
        fileSystem.copyToLocalFile(src, dst);
    }

    public void deleteFile(String path) throws IOException {
        Path src = new Path(path);
        fileSystem.delete(src, true);
    }
}

4. 文件服务接口

FileService.java:

public interface FileService {
    FileEntity save(MultipartFile file) throws IOException;

    Resource loadFileAsResource(Long id) throws FileNotFoundException;

    void delete(Long id) throws IOException;

    Page<FileEntity> findByPage(int pageNum, int pageSize);
}

5. 文件服务实现类

FileServiceImpl.java:

@Service
public class FileServiceImpl implements FileService {
    private final String uploadPath = System.getProperty("user.dir") + "/uploads/";

    @Autowired
    private FileRepository fileRepository;

    @Autowired
    private HdfsUtils hdfsUtils;

    @Override
    public FileEntity save(MultipartFile file) throws IOException {
        String fileName = file.getOriginalFilename();
        String fileType = fileName.substring(fileName.lastIndexOf(".") + 1);
        String filePath = uploadPath + fileName;
        File destFile = new File(filePath);
        file.transferTo(destFile);

        String hdfsFilePath = "/upload/" + fileName;
        hdfsUtils.uploadFile(filePath, hdfsFilePath);

        FileEntity fileEntity = new FileEntity();
        fileEntity.setName(fileName);
        fileEntity.setPath(hdfsFilePath);
        fileEntity.setType(fileType);
        fileEntity.setSize(file.getSize());
        fileEntity.setCreateTime(new Date());
        return fileRepository.save(fileEntity);
    }

    @Override
    public Resource loadFileAsResource(Long id) throws FileNotFoundException {
        FileEntity fileEntity = fileRepository.findById(id).orElseThrow(() -> new FileNotFoundException("文件不存在"));
        String filePath = fileEntity.getPath();
        String fileName = fileEntity.getName();
        Path path = new Path(filePath);
        try {
            FileSystem fs = FileSystem.get(URI.create(hdfsUtils.getHdfsUri()), hdfsUtils.getConfiguration(),
                    hdfsUtils.getHdfsUserName());
            FSDataInputStream inputStream = fs.open(path);
            return new InputStreamResource(inputStream);
        } catch (IOException e) {
            e.printStackTrace();
            throw new FileNotFoundException(e.getMessage());
        }
    }

    @Override
    public void delete(Long id) throws IOException {
        FileEntity fileEntity = fileRepository.findById(id).orElseThrow(() -> new FileNotFoundException("文件不存在"));
        String filePath = fileEntity.getPath();
        hdfsUtils.deleteFile(filePath);
        fileRepository.deleteById(id);
    }

    @Override
    public Page<FileEntity> findByPage(int pageNum, int pageSize) {
        Pageable pageable = PageRequest.of(pageNum, pageSize, Sort.Direction.DESC, "createTime");
        return fileRepository.findAll(pageable);
    }
}

6. 文件控制器

FileController.java:

@RestController
@RequestMapping("/file")
public class FileController {
    @Autowired
    private FileService fileService;

    @PostMapping
    public ResponseEntity<?> uploadFile(@RequestParam("file") MultipartFile file) throws IOException {
        FileEntity fileEntity = fileService.save(file);
        URI location = ServletUriComponentsBuilder.fromCurrentRequest().path("/{id}")
                .buildAndExpand(fileEntity.getId()).toUri();
        return ResponseEntity.created(location).build();
    }

    @GetMapping("/{id}")
    public ResponseEntity<Resource> downloadFile(@PathVariable Long id) throws FileNotFoundException {
        Resource resource = fileService.loadFileAsResource(id);
        return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,
                "attachment; filename=\"" + resource.getFilename() + "\"").body(resource);
    }

    @DeleteMapping("/{id}")
    public ResponseEntity<?> deleteFile(@PathVariable Long id) throws IOException {
        fileService.delete(id);
        return ResponseEntity.noContent().build();
    }

    @GetMapping("/list")
    public ResponseEntity<Page<FileEntity>> getList(@RequestParam(defaultValue = "0") int pageNum,
                                                     @RequestParam(defaultValue = "10") int pageSize) {
        Page<FileEntity> page = fileService.findByPage(pageNum, pageSize);
        return ResponseEntity.ok(page);
    }
}

7. 文件存储仓库

FileRepository.java:

public interface FileRepository extends JpaRepository<FileEntity, Long> {
}

这样，文件上传和下载的功能就完成了。启动应用程序，可以使用POSTMAN或其他客户端上传、下载和删除文件了。