我在使用日期选择器的Spring MVC中遇到了我的.jsp代码。当我访问日期时间选择器时，代码工作正常。但是如果我试图将该字段留空，即不使用日期选择器，则默认为null（它应该），然后给出错误：
无法将类型为java.lang.String的属性值转换为属性ticComDropoofDate所需的类型java.util.Date;嵌套异常是org.springframework.core.convert.ConversionFailedException：无法将值类型“”从类型java.lang.String转换为类型java.util.Date;嵌套异常是java.lang.IllegalArgumentException
我正在附上我的代码，我们将不胜感激。
我的控制器：
public class TicketController extends MasterController{
@InitBinder
protected void initBinder(WebDataBinder binder){
if(binder.getTarget() instanceof TicketDetailsBean)
binder.setValidator(new TicketDetailsValidator());
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, false));
}
@RequestMapping(value="/TicketRegistration", method=RequestMethod.POST)
public ModelAndView createTicketRegistration(@Valid TicketDetailsBean ticket, BindingResult result, Model model) throws SQLException{
TicketManager dm = new TicketManager();
TechManager dm1 = new TechManager();
SimpleMailManager sm = new SimpleMailManager();
ModelAndView modelAndView = new ModelAndView();
if(!result.hasErrors()){
try{
String message = dm.saveTicketRegistration(ticket);
/*if(check)
{
TicketDetailsBean ticket1 = new TicketDetailsBean();
OwnerDetailsBean owner1 = new OwnerDetailsBean();
ticket1 = sm.fetchData(ticket);
owner1 = sm.fetchOwner(ticket1);
}*/
sm.sendMail();/*(owner1,ticket1);*/
List<TicketDetailsBean> ticket2 = dm.findRegisteredTicket();
if(message != null){
message = "Duplicate entry not allowed. Data with same name already in the database...";
modelAndView.addObject("Message", message);
}
modelAndView.setViewName("TicketDatabase");
modelAndView.addObject("ticketDetailsBean", new TicketDetailsBean());
modelAndView.addObject("ticketList", ticket2);
modelAndView.addObject("techDetailsBean", new TechDetailsBean());
modelAndView.addObject("tech", globalBean);
return modelAndView;
}catch (Exception e) {
e.printStackTrace();
}
}
else{
List<TechDetailsBean> tech = dm1.findRegisteredTech();
modelAndView.addObject(result.getAllErrors());
modelAndView.setViewName("TicketRegistration");
modelAndView.addObject("ticketDetailsBean", new TicketDetailsBean());
modelAndView.addObject("techDetailsBean", new TechDetailsBean());
modelAndView.addObject("tech", globalBean);
modelAndView.addObject("techList",tech);
return modelAndView;
}
/*List<TicketDetailsBean> ticket2 = dm.findRegisteredTicket();
modelAndView.addObject("ticketDetailsBean", new TicketDetailsBean());
modelAndView.addObject("ticketList", ticket2);*/
return modelAndView;
}
我的jsp：
<script>
$(function() {
$( "#datepicker" ).datepicker({
dateFormat: 'yy-mm-dd',
showOn: "button",
buttonImage: "<%=request.getContextPath() %>/resources/images/calendar.gif",
buttonImageOnly: true
});
}).val('');
$(function() {
$( "#datepicker1" ).datepicker({ dateFormat: 'yy-mm-dd',
showOn: "button",
buttonImage: "<%=request.getContextPath() %>/resources/images/calendar.gif",
buttonImageOnly: true
});
}).val('');
</script>
<form:form modelAttribute="ticketDetailsBean" action="TicketRegistration" method="post">
<table>
<tr>
<td>
<h1>Ticket Registration Form</h1>
<h3>Please enter the information below</h3>
<h3>click "<b>Save</b>" when complete. </h3>
<h3> Fields marked with an asterisk '<b>*</b>' are required.</h3>
<h3> Click "<b>Reset</b>" to clear the fields</h3>
</td>
</tr>
<tr>
<td>
<fieldset title="info">
<legend><b>Ticket Information</b></legend>
<table>
<tr>
<td align="left"><form:label for="ticDate" path="ticDate" cssErrorClass="error">* Ticket Date :</form:label></td>
<td align="left"><form:input path="ticDate" id="datepicker1" size="35" maxlength="35"/> <form:errors path="ticDate" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticServicetag" path="ticServicetag" cssErrorClass="error">* Service Tag Number :</form:label></td>
<td align="left"><form:input name="ticServicetag" path="ticServicetag" id="ticSrvctag" size="35" maxlength="35" value = "${computerList.comServicetag}" /> <form:errors path="ticServicetag" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticOwnerSuUsername" path="ticOwnerSuUsername" cssErrorClass="error">* Owner Su_username :</form:label></td>
<td align="left"><form:input path="ticOwnerSuUsername" id="owsusenm" size="35" maxlength="35" value ="${computerList.comOwnerSUUsername }" /> <form:errors path="ticOwnerSuUsername" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticTechname" path="ticTechname" cssErrorClass="error">* Tech Name :</form:label></td>
<td align="left">
<select name="ticTechname" id = "ticTechname" id="slectboxid1">
<option value = ""> ---Select--- </option>
<c:forEach var="item" items="${techList}">
<option value = "${item.techName}"><c:out value= "${item.techName}"/></option>
</c:forEach>
</select>
<form:errors path="ticTechname" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticComProblem" path="ticComProblem" cssErrorClass="error">* Problem :</form:label></td>
<td align="left"><form:textarea path="ticComProblem" rows ="3" cols ="27"/> <form:errors path="ticComProblem" cssErrorClass="error" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticComments" path="ticComments" cssErrorClass="error"> Comments :</form:label></td>
<td align="left"><form:textarea path="ticComments" rows = "3" cols = "27"/> <form:errors path="ticComments" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticItemtoOrder" path="ticItemtoOrder" cssErrorClass="error"> Item To Order :</form:label></td>
<td align="left"><form:input path="ticItemtoOrder" size="35" maxlength="35" /> <form:errors path="ticItemtoOrder" /></td>
</tr>
<tr>
<td align="left"><form:label for="ticComDropoofDate" path="ticComDropoofDate" cssErrorClass="error"> Computer Drop Off Date:</form:label></td>
<td align="left"><form:input path="ticComDropoofDate" id="datepicker" size="35" maxlength="35" /> <form:errors path="ticComDropoofDate"/></td>
</tr>
<tr>
<td align="left"><form:label for="ticAssignedTech" path="ticAssignedTech" cssErrorClass="error">* Tech Assigned :</form:label></td>
<td align="left">
<select name="ticAssignedTech" id = "ticAssignedTech" id="slectboxid2">
<option value = ""> ---Select--- </option>
<c:forEach var="item" items="${techList}">
<option value = "${item.techName}"><c:out value= "${item.techName}"/></option>
</c:forEach>
</select>
<form:errors path="ticAssignedTech" />
</td>
</tr>
<tr>
<td align="left"><form:label for="ticStatus" path="ticStatus" cssErrorClass="error">* Ticket Status :</form:label></td>
<td align="left">
<select name="ticStatus" id = "ticStatus" id="slectboxid3">
<option value="">---Select--- </option>
<option value="Open"> Open </option>
<option value="InProgress">In Progress</option>
<option value="Closed">Closed</option>
</select>
<form:errors path="ticStatus" />
</td>
</tr>
<tr>
<td align="left"><form:label for="ticAddEquipments" path="ticAddEquipments" cssErrorClass="error"> Additional Equipments dropped with Computer :</form:label></td>
<td align="left"><form:textarea rows= "3" path="ticAddEquipments" cols ="27"/> <form:errors path="ticAddEquipments" /></td>
</tr>
</table>
</fieldset>
<fieldset>
<div align="center">
<form action="TicketDatabase" method="get">
<input type="submit" name="submit" value="Save"/>
<input type="reset" name="reset"/>
</form>
</div>
</fieldset>
</td>
</tr>
</table>
答案 0 :(得分：0)
异常消息：
Unable to convert value "" from type java.lang.String to type java.util.Date
spring throws因为你没有通知spring将空字符串转换为null。
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, false));
如果你想在空字符串中使用null，则传递true：
binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true));
<小时/> Spring
CustomDateEditor构造函数java docs具有：
public CustomDateEditor(DateFormat dateFormat, boolean allowEmpty)创建一个新的
CustomDateEditor实例，使用给定的DateFormat进行解析和 渲染。allowEmpty参数指出空字符串是否应该 允许解析，即被解释为空值。除此以外， 在这种情况下会抛出IllegalArgumentException。<强>参数：
dateFormat- 用于解析和渲染的DateFormat
allowEmpty- 如果允许空字符串