Question

我是grails的新手，想要学习，在这段代码中我创建了jsonDate并在create方法中使用。当我从SoapUi发送数据时，我收到的错误如Cannot cast object '13/01/2014' with class 'java.lang.String' to class 'java.util.Date'。

class RequestMainController {
    static scaffold = true
    static allowedMethods = [save: "POST", updat``e: "PUT", delete: "DELETE"]
    def index(Integer max) {
        params.max = Math.min(max ?: 10, 100)
        respond RequestMain.list(params), model:[requestMainInstanceCount: RequestMain.count()]
    }

    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
    //System.out.println(Current Date  + sdf.format(new Date());
    String mydate = "01-08-2011";
    Date parseDate = sdf.parse(mydate);

    def slurper = new JsonSlurper()
    def requestMain = slurper.parseText('{"milestoneSequenceNumber":"111","recordStartDate":"13/01/2014",
                                          "recordEndDate":"13/01/2014","application":"app","applicationType":"A""}');

    def create(){
        //def jsonObject = grails.converters.JSON.parse(requestMain) 
        def milestoneSequenceNumber = requestMain.milestoneSequenceNumber
        def recStartDate = requestMain.recordStartDate
        def recEndDate = requestMain.recordEndDate
        def application = requestMain.application
        def applicationType = requestMain.applicationType
        System.out.println(" MILESTONE_SEQ_NO = $milestoneSequenceNumber,REC_START_DATE = $recStartDate, REC_START_DATE=$recEndDate,APPLICATION=$application,APPL_TYPE=$applicationType)

        render(view:"create", action:"save")
    }

    def save() {
        RequestMain requestMain1 = new RequestMain()

        requestMain1.mimeNo = requestMain.milestoneSequenceNumber
        requestMain1.recStartDate = requestMain.recordStartDate
        requestMain1.recEndDate = requestMain.recordEndDate
        requestMain1.application = requestMain.application
        SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
        String mydate = "01-08-2011";
        Date parseDate = sdf.parse(mydate);
        requestMain1.save()
        render "Success!"
    }
}

Answer 1

实际上你在里面的错误是在线保存 -

 Date parseDate = sdf.parse(mydate);

是因为您无法将日期字符串直接更改为SimpleDateFormat。因此，您需要将其更改为Date类对象。

String mydate = "01-08-2011";
def parsedDate = Date.parse("yyyy-MM-dd", mydate);
Date parseDate = sdf.parse(parsedDate);

虽然这样做也是不合逻辑的，因为parsedDate已经是Date类的对象，所以你不需要再转换它。

如果您因任何特定原因未使用SimpleDateFormat，则可以始终使用以下方法 -

将日期更改为特定格式的字符串 -

def myStringDate = dateObj.format("yyyy-MM-dd");

将字符串更改为日期

def myDate = Date.parse("yyyy-MM-dd", myStringDate);

这些方法更具GROOVYish，让您的工作变得轻松。

这些传递的日期格式可以使用java documentation- http://docs.oracle.com/javase/1.5.0/docs/api/java/text/SimpleDateFormat.html

Answer 2

假设您在尝试从创建视图中保存后收到此错误，您似乎忘记在java.lang.Date方法中将字符串转换为save()。在分配到requestMain1属性之前，请将它们转换为java.lang.Date：

def save() {
    RequestMain requestMain1 = new RequestMain()

    requestMain1.mimeNo = requestMain.milestoneSequenceNumber
    SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
    requestMain1.recStartDate = dateFormat.parse(requestMain.recordStartDate)
    requestMain1.recEndDate = dateFormat.parse(requestMain.recordEndDate)
    (...etc...)
}

无法将类'java.lang.String'的对象'parseDate'强制转换为grails中的类'java.util.Date'

2 个答案: