我试图简化验证，但问题是没有应用约束。这是我的模型级客户。
package mvc;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;
public class Customer {
private String firstName;
@NotNull(message="is required")
@Size(min=1, message="is required")
private String lastName;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}这是我的控制器。问题是bindingResult.haserrors（）总是返回false
package mvc;
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 jakarta.validation.Valid;
@Controller
@RequestMapping("/customer")
public class CustomerController {
@RequestMapping("/showForm")
public String showForm(Model theModel) {
theModel.addAttribute("customer", new Customer());
return "customer-form";
}
@RequestMapping("/processForm")
public String processForm(
@Valid @ModelAttribute("customer") Customer theCustomer,
BindingResult theBindingResult) {
System.out.println("Last name: |" + theCustomer.getLastName() + "|");
if (theBindingResult.hasErrors()) {
return "customer-form";
}
else {
return "customer-confirmation";
}
}
}这是我的customer-form.jsp
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
<title>Customer Registiration form</title>
<style type="text/css">
.error{color: red}
</style>
</head>
<body>
<form:form action="processForm" modelAttribute="customer">
FirstName: <form:input path="firstName"/>
<br><br>
LastName (*): <form:input path="lastName"/>
<form:errors path="lastName" cssClass="error"/>
<input type="submit" value="Submit" />
</form:form>
</body>
</html>这是我的customer-confirmation.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<title>Customer confirmation</title>
</head>
<body>
The customer is confirmed: ${customer.firstName} ${customer.lastName}
</body>
</html>注意：我添加了HibernateValidator7JAR。
暂无答案！
目前还没有任何答案，快来回答吧！