溫馨提示×
您好，登錄后才能下訂單哦！
點擊 登錄注冊 即表示同意《億速云用戶服務條款》
您好，登錄后才能下訂單哦！
Spring MVC Validator @InitBinder and WebDataBinder;Validator是一個用來我們自定義驗證的sping接口,WebDataBinder 綁定你的自定義參數,你直接在你的控制器類中通過@InitBinder 注解的方式配置 Web 數據綁定.registerCustomEditor()是一個屬性編輯器,比如自定義的日期編輯它綁定web請求參數到JavaBean的屬性;
下面一個例子,我們創建一個JavaBean(username, password, email and date of birth of a user),我們創建兩個自定義的驗證類.第一個,我們驗證用戶名和密碼.第二個,驗證郵箱,
在Eclipse中Demo的結構
Validator 是一個有兩個方法的接口;
boolean supports(Class<?> clazz) : 檢驗參數是否驗證成功的實例類;
void validate(Object target, Errors errors) : 如果 supports() 方法返回真, target object 合法. Errors.rejectValue() 方法用一個字段名注冊錯誤信息;
UserValidator.java
package com.concretepage.validators;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
import com.concretepage.User;
@Component
public class UserValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return User.class.isAssignableFrom(clazz);
}
@Override
public void validate(Object target, Errors errors) {
User user = (User)target;
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "","Username is empty");
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "password", "", "Password is empty");
if (user.getName().length()<5) {
errors.rejectValue("name","", "Username length is less than 5");
}
}
}
EmailValidator.java
package com.concretepage.validators;
import org.springframework.stereotype.Component;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;
import com.concretepage.User;
@Component
public class EmailValidator implements Validator {
@Override
public boolean supports(Class<?> clazz) {
return User.class.isAssignableFrom(clazz);
}
@Override
public void validate(Object target, Errors errors) {
User user = (User)target;
ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email", "","Email is empty");
if (!user.getEmail().contains("@")) {
errors.rejectValue("email","", "Email is not valid.");
}
}
}
User.java
package com.concretepage;
import java.util.Date;
public class User {
private String name;
private String password;
private String email;
private Date dob;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Date getDob() {
return dob;
}
public void setDob(Date dob) {
this.dob = dob;
}
}
MyWorldController
package com.concretepage;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import com.concretepage.validators.EmailValidator;
import com.concretepage.validators.UserValidator;
@Controller
@RequestMapping("/myworld")
public class MyWorldController {
@Autowired
private UserValidator userValidator;
@Autowired
private EmailValidator emailValidator;
@RequestMapping(value="signup", method = RequestMethod.GET)
public ModelAndView user(){
return new ModelAndView("user","user",new User());
}
@InitBinder
public void dataBinding(WebDataBinder binder) {
binder.addValidators(userValidator, emailValidator);
SimpleDateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
dateFormat.setLenient(false);
binder.registerCustomEditor(Date.class, "dob", new CustomDateEditor(dateFormat, true));
}
@RequestMapping(value="save", method = RequestMethod.POST)
public String createUser(@ModelAttribute("user") @Valid User user,BindingResult result, ModelMap model) {
if(result.hasErrors()) {
return "user";
}
System.out.println("Name:"+ user.getName());
System.out.println("Email:"+ user.getEmail());
System.out.println("Date of Birth:"+ user.getDob());
model.addAttribute("msg", "Welcome to My World!");
return "success";
}
}
Form頁面表單
<form:form action="save" method="post" commandName="user">
<tr> <td>User Name:</td> <td><form:input path="name"/> </td>
<td> <form:errors path="name" cssStyle="color: red;"/></td> </tr>
<tr> <td> Password :</td> <td><form:input path="password"/> </td>
<td> <form:errors path="password" cssStyle="color: red;"/> </td> </tr>
<tr> <td> Email :</td> <td><form:input path="email"/> </td>
<td> <form:errors path="email" cssStyle="color: red;"/> </td> </tr>
<tr> <td> Date of Birth :</td> <td><form:input path="dob"/> </td>
<td> <form:errors path="dob" cssStyle="color: red;"/> </td> </tr>
<tr> <td colspan=3> <input type="submit"> </td>
</form:form>
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
免責聲明：本站發布的內容（圖片、視頻和文字）以原創、轉載和分享為主，文章觀點不代表本網站立場，如果涉及侵權請聯系站長郵箱：is@yisu.com進行舉報，并提供相關證據，一經查實，將立刻刪除涉嫌侵權內容。
