我们可以使用@Validated(类上)与@Valid(参数上)组合,再配合@NotBlank / @NotNull(可以自定义错误message),即可完美解决:
import .*
@Validated
public class CalculationController {
@RequestMapping(value ="/calculate")
@ResponseBody
public CalculationResult calculate(
@Valid @NotBlank @RequestParam(name ="op") String operation,
@Valid @NotNull @RequestParam(name ="num1") Double num1,
@Valid @NotNull @RequestParam(name ="num2") Double num2) {
("Operation:" + operation);
Double calculate = (operation, num1, num2);
return new CalculationResult(calculate);
}
}
应该修改相应的@Test以测试"可能不为空"消息的数组,如下所示:
@Test
public void validates_all_parameters_are_set() throws Exception {
ResponseEntity<String> response = ("/calculate?op=&num1=&num2=", );
assertThat((), equalTo(HttpStatus.BAD_REQUEST));
assertThat((), equalTo("{"error":["may not be null","may not be null"]}"));
}