java 如何验证 @RequestParams 不为空？
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How do I validate that the @RequestParams are not empty?
提问by Saakina
I have a calculator service that gets the operation type, num1 and num2 from the user. I need to validate that the user actually inputs these values and doesn't just leave it blank.
我有一个计算器服务，可以从用户那里获取操作类型 num1 和 num2。我需要验证用户是否实际输入了这些值，而不仅仅是将其留空。
@RequestMapping(value = "/calculate")
@ResponseBody
public CalculationResult calculate(@RequestParam(name = "op") String operation, @RequestParam(name = "num1") Double num1, @RequestParam(name = "num2") Double num2) {
System.out.print("Operation:" + operation);
Double calculate = calculatorService.calculate(operation, num1, num2);
return new CalculationResult(calculate);
}
I have an Integration test that I need to make pass as it is currently failing with error:
我有一个需要通过的集成测试，因为它目前因错误而失败：
{\"timestamp\":1488875777084,\"status\":400,\"error\":\"Bad Request\",\"exception\":\"org.springframework.web.method.annotation.MethodArgumentTypeMismatchException\",\"message\":\"Failed to convert value of type 'java.lang.String' to required type 'java.lang.Double';
{\"时间戳\":1488875777084,\"状态\":400,\"错误\":\"错误请求\",\"异常\":\"org.springframework.web.method.annotation.MethodArgumentTypeMismatchException\ ",\"message\":\"未能将'java.lang.String'类型的值转换为所需的'java.lang.Double'类型；
Below is my Test Case:
下面是我的测试用例：
@Test
public void validates_all_parameters_are_set() throws Exception {
ResponseEntity<String> response = template.getForEntity( "/calculate?op=&num1=&num2=",
String.class);
assertThat(response.getStatusCode(), equalTo(HttpStatus.BAD_REQUEST));
assertThat(response.getBody(), equalTo("{\"error\":\"At least one parameter is invalid or not supplied\"}"));
}
I don't know how to validate this.
我不知道如何验证这一点。
采纳答案by P.J.Meisch
You do not check the values up to now; you could change your code to:
到目前为止，您没有检查值；您可以将代码更改为：
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
@RequestMapping(value = "/calculate")
@ResponseBody
public ResponseEntity<CalculationResult> calculate(@RequestParam(name = "op") String operation,
@RequestParam(name = "num1") Double num1,
@RequestParam(name = "num2") Double num2) {
if(null == op || null == num1 || null == num2) {
throw new IllegalArgumentException("{\"error\":\"At least one parameter is invalid or not supplied\"}")
}
System.out.print("Operation:" + operation);
Double calculate = calculatorService.calculate(operation, num1, num2);
return new ResponseEntity<>(new CalculationResult(calculate), HttpStatus.OK);
}
@ExceptionHandler(IllegalArgumentException.class)
@ResponseStatus(HttpStatus.BAD_REQUEST)
public final String exceptionHandlerIllegalArgumentException(final IllegalArgumentException e) {
return '"' + e.getMessage() + '"';
}
回答by Arpit Aggarwal
I answered similar problem long before herewhich you can follow to write your test as well , as follows:
我很久以前在这里回答过类似的问题，你也可以按照它来编写你的测试，如下：
@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) {
System.out.print("Operation:" + operation);
Double calculate = calculatorService.calculate(operation, num1, num2);
return new CalculationResult(calculate);
}
}
Corresponding @Test should be modified to test for an array of "may not be null"message, as:
应修改相应的@Test 以测试“可能不为空”消息的数组，如：
@Test
public void validates_all_parameters_are_set() throws Exception {
ResponseEntity<String> response = template.getForEntity( "/calculate?op=&num1=&num2=",
String.class);
assertThat(response.getStatusCode(), equalTo(HttpStatus.BAD_REQUEST));
assertThat(response.getBody(), equalTo("{\"error\":[\"may not be null\",\"may not be null\"]}"));
}
