[英]Java Spring receiving list of longs prints MismatchedInputException
我使用以下 PostMapping 来接收 3 个参数:
@PostMapping(value = "/createJobs",
consumes="application/json",
produces="application/json")
public @ResponseBody ResponseEntity<HttpStatus> createJobs(
@RequestBody ArrayList<Long> sizes,
@RequestBody Long accounts,
@RequestBody Long productId
) {
System.out.println(sizes + " " + accounts + " " + productId);
try {
jobService.createJobs(productId, sizes, accounts);
return ResponseEntity.status(HttpStatus.OK).build();
}
catch (final Exception e) {
LOGGER.error(e.getMessage());
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
}
}
我使用 Angular 来发送 post 请求。 我发送的数据如下所示:
{
"productId":715,
"sizes":[3,5],
"accounts":3
}
但发送后请求后,我收到以下错误:
.w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `java.util.ArrayList<java.lang.Long>` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList<java.lang.Long>` out of START_OBJECT token
at [Source: (PushbackInputStream); line: 1, column: 1]]
虽然使用@RequestBody
将每个请求密钥放在方法 arguments 上很方便,但建议为每个请求 Model 制作一个通用的 class。
例如我的 Controller:
ResponseEntity<TransactionLog> checkDiscount(HttpServletRequest request,
@RequestBody RequestCheckDiscount requestBody) {
// Your code here
}
我的请求 Model:
public class RequestCheckDiscount {
private String username;
private int amount;
private long time;
// Standard getters and setters.
}
POST 请求正文中的键应该是productId而不是product 。
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