[英]Json can not deserialize instance Error in Spring
我正在嘗試發送json長列表並從db獲取記錄。
我的控制器是:
@Api(tags = Endpoint.RESOURCE_customer, description = "customer Resource")
@RestController
@RequestMapping(produces = MediaType.APPLICATION_JSON_VALUE,consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseStatus(HttpStatus.OK)
public class CustomerResourceController {
private final customerService customerService;
public CustomerResourceController(customerService customerService) {
this.customerService = customerService;
}
@ApiOperation(
value = "Return customer",
response = customerDto.class, responseContainer="List"
)
@PostMapping(value = Endpoint.RRESOURCE_customer_ID)
public List<customerDto> getCustomersByIds(@RequestBody List<Long> ids) {
return customerService.findcustomerIds(ids);
}
}
客戶類是:
@Headers("Content-Type: " + MediaType.APPLICATION_JSON_VALUE)
public interface CustomerClient {
@RequestLine("POST /customer/customers/search")
List<LocGrpDto> getCustomersByIds(@RequestBody @Validated List<Long> ids);
}
我用JSON在郵遞員中測試此服務:
{“ ids :: [1,7,8]}
但是我得到這個錯誤:
{
"timestamp": "2018-10-05T13:29:57.645+0000",
"status": 400,
"error": "Bad Request",
"message": "Could not read document: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token\n at [Source: java.io.PushbackInputStream@3cb8b584; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token\n at [Source: java.io.PushbackInputStream@3cb8b584; line: 1, column: 1]",
"path": "/api/v1/customer/customers/search",
"errors": []
}
問題是什么? 您是否在這里看到任何問題,或者可能是由於我的服務類或dto類引起的?
嘗試使用有效負載[1,7,8]
而不是{"ids": [1,7,8]}
。
您的JSON將轉換為具有以下格式的請求正文。
class Body {
private List<Long> ids;
// constructor, getters and setters
}
對於REST客戶端,您可以看一下RestTemplate
。
RestTemplate template;
List<Long> ids;
List<CustomerDto> = template.exchange(
"/customer/customers/search",
HttpMethod.POST,
new HttpEntity<>(ids),
new ParameterizedTypeReference<List<CustomerDto>>() {}).getBody()
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