Field error in object 'bisTaskVO' on field 'createTime': rejected value [2023-05-19]; codes [typeMismatch.bisTaskVO.createTime,typeMismatch.createTime,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [bisTaskVO.createTime,createTime]; arguments []; default message [createTime]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'createTime'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@io.swagger.annotations.ApiModelProperty java.util.Date] for value '2023-05-19'; nested exception is java.lang.IllegalArgumentException] at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:164) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)

这个错误是因为在接收前端传来的数据时，类型转换出现了问题。具体来说，前端传来的是一个字符串类型的时间，而后端需要将其转化成 Date 类型，但是转换失败了。这可能是因为前端传来的时间格式不符合后端的要求，或者是后端的转换方式不正确。

你可以先检查一下前端传来的时间格式是否正确，例如是否缺少了某些必要的信息，比如时区、毫秒数等。如果前端传来的时间格式没有问题，那么就需要检查后端的代码，看看是否使用了正确的转换方式。例如，可以通过在后端的实体类中添加 @JsonFormat 注解来指定时间的格式，或者使用 SimpleDateFormat 类来手动转换时间格式。

相关问题

Field error in object 'bisTaskVO' on field 'createTime': rejected value ["2023-05-19 00:00:00"]; codes [typeMismatch.bisTaskVO.createTime,typeMismatch.createTime,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [bisTaskVO.createTime,createTime]; arguments []; default message [createTime]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'createTime'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@io.swagger.annotations.ApiModelProperty java.util.Date] for value '"2023-05-19 00:00:00"'; nested exception is java.lang.IllegalArgumentException] at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:164) at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:126) at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167) at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:892) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)

这个错误是因为在处理请求参数时，Spring无法将字符串类型的时间参数转换为Date类型。请确保时间参数格式正确并且与实体类中的时间字段类型匹配。可以尝试在实体类的createTime字段上添加@DateTimeFormat注解，指定时间格式，例如：@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")。同时也可以使用@RequestParam注解，将时间参数转换为Date类型，例如：public String save(@RequestParam("createTime") @DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss") Date createTime)。

[ { "id": 1, "groupName": "test-wu", "description": "sadsaffdsa", "dingId": "401021613327413104", "userName": "武福根", "email": "eureka.wu@ibaiqiu.com", "createTime": "2023-05-31 03:34:51", "createName": "admin", "updateTime": "2023-05-31 03:34:51", "updateName": "admin" }, { "id": 2, "groupName": "test-wu", "description": "sadsaffdsa", "dingId": "322610312920535304", "userName": "俞永波", "email": "ron.yu@ibaiqiu.com", "createTime": "2023-05-31 03:34:51", "createName": "admin", "updateTime": "2023-05-31 03:34:51", "updateName": "admin" }, { "id": 3, "groupName": "ron-test", "description": "测试2", "dingId": "306208510726220319", "userName": "杨志亮", "email": "sean.yang@ibaiqiu.com", "createTime": "2023-05-31 03:44:12", "createName": "admin", "updateTime": "2023-05-31 03:44:12", "updateName": "admin" }, { "id": 4, "groupName": "ron-test", "description": "测试2", "dingId": "314447695938075811", "userName": "雍睿涵", "email": "ruihan.yong@ibaiqiu.com", "createTime": "2023-05-31 03:44:12", "createName": "admin", "updateTime": "2023-05-31 03:44:12", "updateName": "admin" }, { "id": 5, "groupName": "ron-test", "description": "测试2", "dingId": "066357011133738415", "userName": "蔡秋丹", "email": "qiudan.cai@ibaiqiu.com", "createTime": "2023-05-31 03:44:12", "createName": "admin", "updateTime": "2023-05-31 03:44:12", "updateName": "admin" }, { "id": 6, "groupName": "ron-test", "description": "测试2", "dingId": "322610312920535304", "userName": "俞永波", "email": "ron.yu@ibaiqiu.com", "createTime": "2023-05-31 03:34:51", "createName": "admin", "updateTime": "2023-05-31 03:34:51", "updateName": "admin" } ] stream分组，将

根据groupName分组，并将每个分组中的元素的id和userName字段提取出来，放入一个Map中。可以使用Java 8的Stream API中的groupingBy方法结合mapping方法来实现，示例代码如下：

List<User> userList = ... // 假设已经初始化了一个User列表
Map<String, List<Map<String, Object>>> groupedByGroupName = userList.stream()
    .collect(Collectors.groupingBy(User::getGroupName, 
             Collectors.mapping(user -> {
                 Map<String, Object> map = new HashMap<>();
                 map.put("id", user.getId());
                 map.put("userName", user.getUserName());
                 return map;
             }, Collectors.toList())));

上述代码中，groupedByGroupName就是一个Map对象，key为groupName，value为该groupName对应的所有用户的id和userName字段的Map对象列表。需要注意的是，上述代码中的User类需要有getGroupName、getId和getUserName三个方法来获取groupName、id和userName。