这个问题在这里已经有答案了：

使用spring处理rest应用程序中Map的不明确处理程序方法（2个答案）
三个月前关门了。
我是新来的Sping Boot 。我对以下支持按名称获取原始数据的方法有问题：

@RestController
@RequiredArgsConstructor
@RequestMapping("/api")
public class AccountsResource {

    private final AccountsService service;

    @GetMapping("/accounts/{name}")
    public ResponseEntity<?> getByName(@PathVariable String name){
        return ResponseEntity.ok(service.getByUsername(name));
    }

}

这是我的accountsservice类：

public Accounts getByUsername(String username) {
    Optional<Accounts> byUsername = repository.findByUsername(username);
    return byUsername.orElseThrow(() -> new RuntimeException("User not found"));
}

这是我的Accounts存储库类：

@Repository
public interface AccountsRepository extends JpaRepository<Accounts, Long> {

    @Query(value = "SELECT * FROM accounts where name = ?", nativeQuery = true)
    Optional<Accounts> findByUsername(String username);

}

这是我的实体类：

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
@Entity
@Table(name = "accounts")
public class Accounts extends BaseEntity {

    private String name;
    private String website;
    private String pContact;

    @ManyToOne
    @JoinColumn(name="sales_rep_id", referencedColumnName = "id")
    private SalesRep sales;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "accounts")
    private List<Orders> orders;

    @OneToMany(mappedBy = "account", cascade = CascadeType.ALL)
    private List<WebEvents> webEvents;

}

当我尝试发送get请求时http://localhost：8081/api/accounts/1，我得到：

{
    "timestamp": "2021-02-09T12:36:02.943+00:00",
    "status": 500,
    "error": "Internal Server Error",
    "message": "",
    "path": "/api/accounts/1"
}

除了以下例外情况：

java.lang.IllegalStateException: Ambiguous handler methods mapped for '/api/accounts/1': {public org.springframework.http.ResponseEntity com.example.demo.web.rest.AccountsResource.getById(java.lang.Long), public org.springframework.http.ResponseEntity com.example.demo.web.rest.AccountsResource.getByName(java.lang.String)}

我希望在这方面得到任何建议。由于我是新手，我很感谢任何有效的建议和链接。