[英]java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'CityInfos' available as request attribute
[英]Simple Java Web validation Neither BindingResult nor plain target object for bean name 'number' available as request attribute
我在验证简单的“ NumberValidate”对象时遇到问题
在这里,您可以看到JSP文件:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Vul een nummer in:</h1>
<form:form action="form" modelAttribute="number" method="POST">
<form:input path="number"/>
<form:errors path="number"/>
<input type="submit" value="submit"/>
</form:form>
</body>
</html>
控制器:
package controller;
import domain.NumberValidate;
import javax.validation.Valid;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
public class ValidationController {
@RequestMapping(value = {"form"}, method = RequestMethod.GET)
public String showHomePage(Model model){
model.addAttribute("number", new NumberValidate());
return "validation";
}
@RequestMapping(value = {"form"}, method = RequestMethod.POST)
public String showHomePage(@Valid @ModelAttribute NumberValidate number, BindingResult result){
if(result.hasErrors())
return "validation";
return "success";
}
}
“ NumberValidate”类:
包域;
import javax.validation.constraints.Min;
public class NumberValidate {
@Min(50)
private int number;
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
}
}
当我运行该应用程序时,它会以文本框等正常启动。当我键入一个小于40的数字时,会出现错误:java.lang.IllegalStateException:BeanResult'number'的BindingResult或普通目标对象都不能用作请求属性
有人可以帮我解决这个问题吗?
如果验证有错误,则返回验证视图时需要在模型中添加数字属性。 代码段如下:
@RequestMapping(value = {"form"}, method = RequestMethod.POST) public String showHomePage(@Valid @ModelAttribute NumberValidate number, BindingResult result){ if(result.hasErrors()){ model.addAttribute("number", number); return "validation"; } return "success"; }
在showHomePage
方法中,更改为@ModelAttribute("number")
并执行以下操作:
if(result.hasErrors()) {
return "validation";
}
return "success";
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