这是我的控制器：

@CrossOrigin(origins = "http://localhost:3000")
@RestController
@RequestMapping("/api/v1/employees")
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping()
    public List<Employee> getEmployeesBySearch(@Valid @ModelAttribute SearchDto searchDto) {
        return employeeService.getEmployeesBySearch(searchDto);
    }
}

这是我的搜索目标：

public class SearchDto {

    private String firstName;

    public String getFirstName() {
        return this.firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
}

.

http://localhost:8080/api/v1/employees?firstName=%%%
http://localhost:8080/api/v1/employees?firstName=a%
http://localhost:8080/api/v1/employees?firstName=%a

每当get请求中有percent（%）符号时，它总是给出null值。