Question

在主题中，我想获取日期作为参数传递。我有这种依赖性：

<dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

我的URL如下：

http://localhost:8080/userProducts/2?date=2019-3-29

我的控制器类如下：

package trainingapp.userproduct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.web.bind.annotation.*;
import trainingapp.calculations.NutrientsCalculationFacade;
import trainingapp.historysystemofmeals.HistorySystemService;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.List;

@RestController
public class UserProductController {

    private final NutrientsCalculationFacade userProductCalculationFacade;
    private final UserProductFindOperationService userProductFindOperationService;
    private final HistorySystemService historySystemService;

    @Autowired
    public UserProductController(NutrientsCalculationFacade userProductCalculationFacade, UserProductFindOperationService userProductFindOperationService, HistorySystemService historySystemService) {
        this.userProductCalculationFacade = userProductCalculationFacade;
        this.userProductFindOperationService = userProductFindOperationService;
        this.historySystemService = historySystemService;
    }

    //yyyy-MM-dd
    @GetMapping("/userProducts/{userID}")
    public String getAllEatenSummedNutrientsByGivenIDInParticularDay(@PathVariable int userID,
                                                                     @RequestParam("date")
                                                                     @DateTimeFormat(iso = DateTimeFormat.ISO.DATE) LocalDate date) {
        return historySystemService.getAllEatenSummedNutrientsByGivenIDInParticularDay(userID, date);
    }
}

我遇到错误：

{
    "timestamp": "2019-03-29T15:22:44.640+0000",
    "status": 400,
    "error": "Bad Request",
    "message": "Failed to convert value of type 'java.lang.String' to required type 'java.time.LocalDate'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.RequestParam @org.springframework.format.annotation.DateTimeFormat java.time.LocalDate] for value '2019-3-29'; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2019-3-29]",
    "path": "/userProducts/2"
}

我应该更改或添加什么？我正在尝试通过以下方法解决此问题： How to use LocalDateTime RequestParam in Spring? I get "Failed to convert String to LocalDateTime"，但是没有用。

Answer 1

2019-3-29是错误输入，并且400状态码是准确的。请参阅DateTimeFormat.ISO#DATE文档：

最常见的ISO日期格式yyyy-MM-dd，例如“ 2000-10-31”。

因此，要匹配上述格式，您的输入应改为2019-03-29。

无法将类型“ java.lang.String”的值转换为所需的类型“ java.time.LocalDate”；

1 个答案: