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！