1

我很简单，我放一个字符串，我使用注释来验证值，但它不起作用

这是我的课：

public class Destination
{
    @NotNull
    String address;

    public Destination(){}

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

这是我的控制器方法

@RequestMapping(value = "/search", method = RequestMethod.POST)
public String findDestination(@ModelAttribute("destination") @Valid Destination destination, BindingResult result, RedirectAttributes redirectAttrs) {
    if(result.hasErrors()) {
        return "redirect:/";
    }
    Location location = LocationManager.getLocation(destination.getAddress());
    Weather weather = WeatherManager.getWeather(location);
    redirectAttrs.addFlashAttribute("weather", weather);
    redirectAttrs.addFlashAttribute("location", location);
    return "redirect:/";
}

这是我在jsp文件中的表格：

    <form:form method="post" action="search" commandName="destination" class="form-horizontal">
    <div class="control-group">
        <div class="controls">
            <form:input path="address" placeholder="Enter destination address"/>
            <form:errors path="address" cssclass="error"></form:errors>
            <input type="submit" value="Search" class="btn"/>
            </form:form>
        </div>
    </div>

所以问题是当我把它留空时它不验证我的输入它仍然尝试从空目标对象获取位置对象的地址并且我得到了异常 HTTP Status 500 - Request processing failed; nested exception is java.util.NoSuchElementException

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.util.NoSuchElementException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause

java.util.NoSuchElementException
    java.util.ArrayList$Itr.next(ArrayList.java:794)
    com.springapp.mvc.domain.LocationManager.getLocation(LocationManager.java:52)
    com.springapp.mvc.controller.HomeController.findDestination(HomeController.java:51)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
4

1 回答 1

0

提交时的空 html 输入是空字符串，这可能是您的验证不起作用的原因。您可以尝试添加@Size 注释，即@Size(min=1)

于 2013-09-06T14:10:24.137 回答