java - 如何让 Spring MVC 读取日期格式为 "2019-3-29"的路径参数？

Question

我想获取一个作为查询参数传递给 Spring MVC Controller 的日期。

我有这样的依赖:

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

我的网址如下所示:

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

我的 Controller 类如下所示:

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);
    }
}

我收到以下错误:

{
    "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？我试图用 How to use LocalDateTime RequestParam in Spring? I get "Failed to convert String to LocalDateTime" 解决这个问题，但没有成功。

Answer 1

2019-3-29 是一个错误的输入，400 状态代码是准确的。请参阅DateTimeFormat.ISO#DATE文档:

The most common ISO Date Format yyyy-MM-dd, e.g. "2000-10-31".

因此，为了匹配上述格式，您的输入应改为 2019-03-29。