如何在Spring中使用LocalDateTime RequestParam？我得到 "Failed to convert String to LocalDateTime"

Question

我使用 Spring 启动并在 Maven 中包含 jackson-datatype-jsr310：

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.7.3</version>
</dependency>

当我尝试使用 Java 8 Date/Time 类型的 RequestParam 时，

@GetMapping("/test")
public Page<User> get(
    @RequestParam(value = "start", required = false)
    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime start) {
//...
}

并用这个 URL:

进行测试

/test?start=2016-10-8T00:00

我收到以下错误：

{
  "timestamp": 1477528408379,
  "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.time.LocalDateTime]; 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.LocalDateTime] for value '2016-10-8T00:00'; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2016-10-8T00:00]",
  "path": "/test"
}

Answer 1

TL;DR - 您可以仅使用 @RequestParam 将其捕获为字符串，或者您可以让 Spring 将字符串另外解析为 java 日期/时间 class 也通过参数 @DateTimeFormat。

@RequestParam 足以获取您在 = 符号后提供的日期，但是，它作为 String 进入方法。这就是它抛出强制转换异常的原因。

有几种方法可以实现：

自己解析日期，获取字符串形式的值。

@GetMapping("/test")
public Page<User> get(@RequestParam(value="start", required = false) String start){

    //Create a DateTimeFormatter with your required format:
    DateTimeFormatter dateTimeFormat = 
            new DateTimeFormatter(DateTimeFormatter.BASIC_ISO_DATE);

    //Next parse the date from the @RequestParam, specifying the TO type as 
a TemporalQuery:
   LocalDateTime date = dateTimeFormat.parse(start, LocalDateTime::from);

    //Do the rest of your code...
}

利用 Spring 自动解析和预期日期格式的能力：

@GetMapping("/test")
public void processDateTime(@RequestParam("start") 
                            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) 
                            LocalDateTime date) {
        // The rest of your code (Spring already parsed the date).
}

Answer 2

我运行遇到了同样的问题并找到了我的解决方案 here（不使用注释）

...you must at least properly register a string to [LocalDateTime] Converter in your context, so that Spring can use it to automatically do this for you every time you give a String as input and expect a [LocalDateTime]. (A big number of converters are already implemented by Spring and contained in the core.convert.support package, but none involves a [LocalDateTime] conversion)

所以在你的情况下你会这样做：

public class StringToLocalDateTimeConverter implements Converter<String, LocalDateTime> {
    public LocalDateTime convert(String source) {
        DateTimeFormatter formatter = DateTimeFormatter.BASIC_ISO_DATE;
        return LocalDateTime.parse(source, formatter);
    }
}

然后只需注册您的 bean：

<bean class="com.mycompany.mypackage.StringToLocalDateTimeConverter"/>

有注释

将其添加到您的 ConversionService：

@Component
public class SomeAmazingConversionService extends GenericConversionService {

    public SomeAmazingConversionService() {
        addConverter(new StringToLocalDateTimeConverter());
    }

}

最后，您将在 ConversionService 中使用@Autowire：

@Autowired
private SomeAmazingConversionService someAmazingConversionService;

您可以在此 site 上阅读有关使用 spring（和格式）进行转换的更多信息。请注意，它有大量广告，但我确实发现它是一个有用的网站，并且是该主题的一个很好的介绍。

Answer 3

你做的一切都是正确的:)。 Here is an example that shows exactly what you are doing. Just Annotate your RequestParam with @DateTimeFormat. There is no need for special GenericConversionService or manual conversion in the controller. This 博客 post 写了它。

@RestController
@RequestMapping("/api/datetime/")
final class DateTimeController {

    @RequestMapping(value = "datetime", method = RequestMethod.POST)
    public void processDateTime(@RequestParam("datetime") 
                                @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime dateAndTime) {
        //Do stuff
    }
}

我猜你的格式有问题。在我的设置中一切正常。

Answer 4

就像我在评论中所说的那样，您也可以在签名方法中使用此解决方案：@RequestParam @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime start

Answer 5

我找到了解决方法 here。

Spring/Spring Boot only supports the date/date-time format in BODY parameters.

以下配置class在QUERY STRING（请求参数）中添加对date/date-time的支持：

// Since Spring Framwork 5.0 & Java 8+
@Configuration
public class DateTimeFormatConfiguration implements WebMvcConfigurer {

    @Override
    public void addFormatters(FormatterRegistry registry) {
        DateTimeFormatterRegistrar registrar = new DateTimeFormatterRegistrar();
        registrar.setUseIsoFormat(true);
        registrar.registerFormatters(registry);
    }
}

分别是：

// Until Spring Framwork 4.+
@Configuration
public class DateTimeFormatConfiguration extends WebMvcConfigurerAdapter {

    @Override
    public void addFormatters(FormatterRegistry registry) {
        DateTimeFormatterRegistrar registrar = new DateTimeFormatterRegistrar();
        registrar.setUseIsoFormat(true);
        registrar.registerFormatters(registry);
    }
}

即使您将多个请求参数绑定到某些 class 也能正常工作（@DateTimeFormat 注释在这种情况下无能为力）：

public class ReportRequest {
    private LocalDate from;
    private LocalDate to;

    public LocalDate getFrom() {
        return from;
    }

    public void setFrom(LocalDate from) {
        this.from = from;
    }

    public LocalDate getTo() {
        return to;
    }

    public void setTo(LocalDate to) {
        this.to = to;
    }
}

// ...

@GetMapping("/api/report")
public void getReport(ReportRequest request) {
// ...

Answer 6

以下适用于 Spring Boot 2.1.6：

控制器

@Slf4j
@RestController
public class RequestController {

    @GetMapping
    public String test(RequestParameter param) {
        log.info("Called services with parameter: " + param);
        LocalDateTime dateTime = param.getCreated().plus(10, ChronoUnit.YEARS);
        LocalDate date = param.getCreatedDate().plus(10, ChronoUnit.YEARS);

        String result = "DATE_TIME: " + dateTime + "<br /> DATE: " + date;
        return result;
    }

    @PostMapping
    public LocalDate post(@RequestBody PostBody body) {
        log.info("Posted body: " + body);
        return body.getDate().plus(10, ChronoUnit.YEARS);
    }
}

Dto classes:

@Value
public class RequestParameter {
    @DateTimeFormat(iso = DATE_TIME)
    LocalDateTime created;

    @DateTimeFormat(iso = DATE)
    LocalDate createdDate;
}

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class PostBody {
    LocalDate date;
}

测试class:

@RunWith(SpringRunner.class)
@WebMvcTest(RequestController.class)
public class RequestControllerTest {

    @Autowired MockMvc mvc;
    @Autowired ObjectMapper mapper;

    @Test
    public void testWsCall() throws Exception {
        String pDate        = "2019-05-01";
        String pDateTime    = pDate + "T23:10:01";
        String eDateTime = "2029-05-01T23:10:01"; 

        MvcResult result = mvc.perform(MockMvcRequestBuilders.get("")
            .param("created", pDateTime)
            .param("createdDate", pDate))
          .andExpect(status().isOk())
          .andReturn();

        String payload = result.getResponse().getContentAsString();
        assertThat(payload).contains(eDateTime);
    }

    @Test
    public void testMapper() throws Exception {
        String pDate        = "2019-05-01";
        String eDate        = "2029-05-01";
        String pDateTime    = pDate + "T23:10:01";
        String eDateTime    = eDate + "T23:10:01"; 

        MvcResult result = mvc.perform(MockMvcRequestBuilders.get("")
            .param("created", pDateTime)
            .param("createdDate", pDate)
        )
        .andExpect(status().isOk())
        .andReturn();

        String payload = result.getResponse().getContentAsString();
        assertThat(payload).contains(eDate).contains(eDateTime);
    }


    @Test
    public void testPost() throws Exception {
        LocalDate testDate = LocalDate.of(2015, Month.JANUARY, 1);

        PostBody body = PostBody.builder().date(testDate).build();
        String request = mapper.writeValueAsString(body);

        MvcResult result = mvc.perform(MockMvcRequestBuilders.post("")
            .content(request).contentType(APPLICATION_JSON_VALUE)
        )
        .andExpect(status().isOk())
        .andReturn();

        ObjectReader reader = mapper.reader().forType(LocalDate.class);
        LocalDate payload = reader.readValue(result.getResponse().getContentAsString());
        assertThat(payload).isEqualTo(testDate.plus(10, ChronoUnit.YEARS));
    }

}

Answer 7

上面的答案对我不起作用，但我犯了一个错误，在这里找到了一个答案：https://blog.codecentric.de/en/2017/08/parsing-of-localdate-query-parameters-in-spring-boot/ 获胜的片段是 ControllerAdvice 注释，它的优点是可以在所有控制器上应用此修复:

@ControllerAdvice
public class LocalDateTimeControllerAdvice
{

    @InitBinder
    public void initBinder( WebDataBinder binder )
    {
        binder.registerCustomEditor( LocalDateTime.class, new PropertyEditorSupport()
        {
            @Override
            public void setAsText( String text ) throws IllegalArgumentException
            {
                LocalDateTime.parse( text, DateTimeFormatter.ISO_DATE_TIME );
            }
        } );
    }
}

Answer 8

您可以添加到配置中，此解决方案适用于可选参数和非可选参数。

@Bean
    public Formatter<LocalDate> localDateFormatter() {
        return new Formatter<>() {
            @Override
            public LocalDate parse(String text, Locale locale) {
                return LocalDate.parse(text, DateTimeFormatter.ISO_DATE);
            }

            @Override
            public String print(LocalDate object, Locale locale) {
                return DateTimeFormatter.ISO_DATE.format(object);
            }
        };
    }


    @Bean
    public Formatter<LocalDateTime> localDateTimeFormatter() {
        return new Formatter<>() {
            @Override
            public LocalDateTime parse(String text, Locale locale) {
                return LocalDateTime.parse(text, DateTimeFormatter.ISO_DATE_TIME);
            }

            @Override
            public String print(LocalDateTime object, Locale locale) {
                return DateTimeFormatter.ISO_DATE_TIME.format(object);
            }
        };
    }

Answer 9

对于全局配置：

public class LocalDateTimePropertyEditor extends PropertyEditorSupport {

    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        setValue(LocalDateTime.parse(text, DateTimeFormatter.ISO_LOCAL_DATE_TIME));
    }

}

然后

@ControllerAdvice
public class InitBinderHandler {

    @InitBinder
    public void initBinder(WebDataBinder binder) { 
        binder.registerCustomEditor(OffsetDateTime.class, new OffsetDateTimePropertyEditor());
    }

}

Answer 10

Spring引导 2.X.X 和更新

如果使用依赖项spring-boot-starter-web version 2.0.0.RELEASE or higher, there is no longer needed to explicitely include jackson-datatype-jsr310 dependency, which is already provided with spring-boot-starter-web through spring-boot-starter-json。

这已解决为 Spring 启动问题 #9297 and the 仍然有效且相关：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>2.0.0.RELEASE</version>
</dependency>

@RequestMapping(value = "datetime", method = RequestMethod.POST)
public void foo(
        @RequestParam("dateTime") 
        @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime ldt) {

    // IMPLEMENTATION
}

Answer 11

这是另一个带参数转换器的通用解决方案：

import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;
import ru.diasoft.micro.msamiddleoffice.ftcaa.customerprofile.config.JacksonConfig;

import java.time.DateTimeException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

@Component
public class LocalDateTimeConverter implements Converter<String, LocalDateTime>{

    private static final List<String> SUPPORTED_FORMATS = Arrays.asList("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", "[another date time format ...]");
    private static final List<DateTimeFormatter> DATE_TIME_FORMATTERS = SUPPORTED_FORMATS
            .stream()
            .map(DateTimeFormatter::ofPattern)
            .collect(Collectors.toList());

    @Override
    public LocalDateTime convert(String s) {

        for (DateTimeFormatter dateTimeFormatter : DATE_TIME_FORMATTERS) {
            try {
                return LocalDateTime.parse(s, dateTimeFormatter);
            } catch (DateTimeParseException ex) {
                // deliberate empty block so that all parsers run
            }
        }

        throw new DateTimeException(String.format("unable to parse (%s) supported formats are %s",
                s, String.join(", ", SUPPORTED_FORMATS)));
    }
}

Answer 12

您可以在 application properties 中全局配置日期时间格式。喜欢：

spring.mvc.format.date=yyyy-MM-dd

spring.mvc.format.date-time=yyyy-MM-dd HH:mm:ss

spring.mvc.format.time=HH:mm:ss

检查mavern：org.springframework.boot:spring-boot-autoconfigure:2.5.3

Answer 13

我在相关上下文中遇到了类似的问题

我正在使用 WebRequestDataBinder 将请求参数动态映射到模型。

Object domainObject = ModelManager.getEntity(entityName).newInstance();
WebRequestDataBinder binder = new WebRequestDataBinder(domainObject);
binder.bind(request);

这段代码适用于基元，但不适用于 LocalDateTime 类型属性

为了解决这个问题，在调用 binder.bind 之前，我在调用 bind()

之前注册了一个自定义编辑器

binder.registerCustomEditor(LocalDateTime.class, new PropertyEditorSupport()
                {
                    @Override
                    public void setAsText(String text) throws IllegalArgumentException
                    {
                        setValue(LocalDateTime.parse(text, DateTimeFormatter.ISO_DATE_TIME));
                    }

                    @Override
                    public String getAsText() {
                        return DateTimeFormatter.ISO_DATE_TIME.format((LocalDateTime) getValue());
                    }

                }
            );

这解决了问题。

如何在Spring中使用LocalDateTime RequestParam？我得到 "Failed to convert String to LocalDateTime"

How to use LocalDateTime RequestParam in Spring? I get "Failed to convert String to LocalDateTime"

spring

spring-boot

spring-mvc

java-time

jsr310

Spring引导 2.X.X 和更新