我有一个LanguageController类，其中有这个方法：

@GetMapping("/languages")
public ResponseEntity<List<Language>> getAllLanguages(@RequestParam(required = false) String name) {
    try {
        List<Language> languages = new ArrayList<Language>();

        if (name == null) {
            languageRepository.findAll().forEach(languages::add);
        } else {
            languageRepository.findByNameContaining(name).forEach(languages::add);
        }

        if (languages.isEmpty()) {
            return new ResponseEntity<>(HttpStatus.NO_CONTENT);
        }

        return new ResponseEntity<>(languages, HttpStatus.OK);
    } catch (Exception e) {
        return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

Language类是（省略了getter和setter，这样更简洁）：

@Entity
@Table(name = "languages")
public class Language {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Column(name = "name")
    private String name;

    @Column(name = "audio")
    @Lob
    private Blob audio;

    @Column(name = "script")
    @Lob
    private Blob script;

    public Language() {

    }

    public Language(String name, Blob audio, Blob script) {
        this.name = name;
        this.audio = audio;
        this.script = script;
    }
}

在这里，当我使用API端点时，我得到了这个JSON：

[
  {
    "id": 1,
    "name": "Test Language",
    "audio": {
      "binaryStream": {},
      "wrappedBlob": {
        "binaryStream": {},
        "traceId": 26,
        "traceObjectName": "blob26"
      }
    },
    "script": {
      "binaryStream": {},
      "wrappedBlob": {
        "binaryStream": {},
        "traceId": 27,
        "traceObjectName": "blob27"
      }
    }
  }
]

在这里，我返回BLOB流，它不是非常有用。
我想返回用Base64编码的BLOB，但我真的不知道在哪里对文件进行编码。
谢谢你的帮忙!