Database 改变弹簧映射行为

我在控制器中的保存方法有问题

我有一张带旅行的表格，还有一张可选的回程表 我尝试做的是，如果travel2所有字段都已填充，则保存travel1+travel2 除此之外，只有旅行1

但是日志说我不能，因为它在注释之前的某个地方失败了

编辑：如果未填写日期，则会崩溃

#2result:org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'FormModel' on field 'travel2.traveldate': rejected value []; codes [typeMismatch.FormModel.travel2.traveldate,typeMismatch.travel2.traveldate,typeMismatch.traveldate,typeMismatch.java.util.Date,typeMismatch]; arguments [org.springframework.context.support.DefaultMessageSourceResolvable: codes [FormModel.travel2.traveldate,travel2.traveldate]; arguments []; default message [travel2.traveldate]]; default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'travel2.traveldate'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.util.Date] for value ''; nested exception is java.lang.IllegalArgumentException]

那么，如何在不在DB中设置允许为null的情况下更改行为呢

@RequestMapping(value = "/users", method = RequestMethod.POST)
public String saveOrUpdateUser(@ModelAttribute("FormModel") @Validated FormModel formmodel, 
        BindingResult result, Model model, final RedirectAttributes redirectAttributes) {....
        if (result.hasErrors()) {
System.out.println("#2result:"+result);
//IF ...(formmodel.getTravel2().allFilled())
        //travelService.save(formmodel.getTravel(),formmodel.getTravel2());

formmodel包装器类：

public class FormModel {
    private User user;
    private Costcenter costcenter;
    private Travel travel;
    private Travel travel2;...

表格：

<form:hidden path="travel2.t_id" />   
            <spring:bind path="travel2.traveldate">
                <div class="form-group has-feedback${status.error ? 'has-error' : ''}">
                    <label class="col-md-2 control-label">Travel Date</label>
                    <div class="col-md-10">
                        <form:input path="travel2.traveldate" class="form-control"
                            id="datepicker2" type="text" placeholder="Traveldate" />
                        <span class="glyphicon glyphicon-calendar form-control-feedback"></span>
                        <form:errors path="travel2.traveldate" class="control-label" />
                    </div>
                </div>
            </spring:bind>

---

在错误日志中，清楚地提到了类型与您的旅行类中的属性travelDate不匹配。您可能在域类中使用日期类型，但当您在UI页面中为同一字段填充值时，它将以字符串格式发布值。尝试使用以下参考更改travelDate的getter和setter方法的代码

private Date createdOn;

public String getCreatedOn() {
    String dateInString=null;
    if(createdOn!=null){
        DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
        dateInString = df.format(createdOn);
    }
    return dateInString;
}
public void setCreatedOn(String createdOn) {
    try {

        SimpleDateFormat sdf=new SimpleDateFormat("dd/MM/yyyy");
        sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
        this.createdOn = sdf.parse(createdOn);
    } catch(ParseException e) {
        this.createdOn=null;  
    }        
}

---

如果这似乎不起作用，请发布UI页面的代码

发布您的

Travel

classthx，但日期类型问题在周五得到解决。现在的问题是，如果我没有travel2->获得错误日期的值。如果我选择一个日期，它会起作用。但我会检查的

public class Travel {
Integer t_id;

Date traveldate;    
Time starttime;
String start;
String destination;

public Integer gett_id() {
    return t_id;
}

public void sett_id(Integer t_id) {
    this.t_id = t_id;
}...
public boolean allFilled(){
    if (traveldate!=null && starttime!= null 
        && start !=null && start !=""
        && destination != null && destination != ""){
    return true;
    } else {
        return false;
    }

}....

private Date createdOn;

public String getCreatedOn() {
    String dateInString=null;
    if(createdOn!=null){
        DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
        dateInString = df.format(createdOn);
    }
    return dateInString;
}
public void setCreatedOn(String createdOn) {
    try {

        SimpleDateFormat sdf=new SimpleDateFormat("dd/MM/yyyy");
        sdf.setTimeZone(TimeZone.getTimeZone("GMT"));
        this.createdOn = sdf.parse(createdOn);
    } catch(ParseException e) {
        this.createdOn=null;  
    }        
}