下面一个例子,我们创建一个javabean(username, password, email and date of birth of a user),我们创建两个自定义的验证类.第一个,我们验证用户名和密码.第二个,验证邮箱,
在eclipse中demo的结构
validator 是一个有两个方法的接口;
boolean supports(class<?> clazz) : 检验参数是否验证成功的实例类;
void validate(object target, errors errors) : 如果 supports() 方法返回真, target object 合法. errors.rejectvalue() 方法用一个字段名注册错误信息;
uservalidator.java
1 package com.concretepage.validators; 2 import org.springframework.stereotype.component; 3 import org.springframework.validation.errors; 4 import org.springframework.validation.validationutils; 5 import org.springframework.validation.validator; 6 import com.concretepage.user; 7 @component 8 public class uservalidator implements validator { 9 @override10 public boolean supports(class<?> clazz) {11 return user.class.isassignablefrom(clazz);12 }13 @override14 public void validate(object target, errors errors) {15 user user = (user)target;16 validationutils.rejectifemptyorwhitespace(errors, name, ,username is empty);17 validationutils.rejectifemptyorwhitespace(errors, password, , password is empty);18 if (user.getname().length()<5) {19 errors.rejectvalue(name,, username length is less than 5);20 }21 }22 }
uservalidator.java
emailvalidator.java
1 package com.concretepage.validators; 2 import org.springframework.stereotype.component; 3 import org.springframework.validation.errors; 4 import org.springframework.validation.validationutils; 5 import org.springframework.validation.validator; 6 import com.concretepage.user; 7 @component 8 public class emailvalidator implements validator { 9 @override10 public boolean supports(class<?> clazz) {11 return user.class.isassignablefrom(clazz);12 }13 @override14 public void validate(object target, errors errors) {15 user user = (user)target;16 validationutils.rejectifemptyorwhitespace(errors, email, ,email is empty);17 if (!user.getemail().contains(@)) {18 errors.rejectvalue(email,, email is not valid.);19 }20 }21 }
emailvalidator.java
user.java
1 package com.concretepage; 2 import java.util.date; 3 public class user { 4 private string name; 5 private string password; 6 private string email; 7 private date dob; 8 public string getname() { 9 return name; 10 } 11 public void setname(string name) { 12 this.name = name; 13 } 14 public string getpassword() { 15 return password; 16 } 17 public void setpassword(string password) { 18 this.password = password; 19 } 20 public string getemail() { 21 return email; 22 } 23 public void setemail(string email) { 24 this.email = email; 25 } 26 public date getdob() { 27 return dob; 28 } 29 public void setdob(date dob) { 30 this.dob = dob; 31 } 32 }
user.java
myworldcontroller
1 package com.concretepage; 2 import java.text.simpledateformat; 3 import java.util.date; 4 5 import javax.validation.valid; 6 7 import org.springframework.beans.factory.annotation.autowired; 8 import org.springframework.beans.propertyeditors.customdateeditor; 9 import org.springframework.stereotype.controller;10 import org.springframework.ui.modelmap;11 import org.springframework.validation.bindingresult;12 import org.springframework.web.bind.webdatabinder;13 import org.springframework.web.bind.annotation.initbinder;14 import org.springframework.web.bind.annotation.modelattribute;15 import org.springframework.web.bind.annotation.requestmapping;16 import org.springframework.web.bind.annotation.requestmethod;17 import org.springframework.web.servlet.modelandview;18 19 import com.concretepage.validators.emailvalidator;20 import com.concretepage.validators.uservalidator;21 @controller22 @requestmapping(/myworld)23 public class myworldcontroller {24 @autowired25 private uservalidator uservalidator;26 @autowired27 private emailvalidator emailvalidator;28 29 @requestmapping(value=signup, method = requestmethod.get)30 public modelandview user(){31 return new modelandview(user,user,new user());32 }33 @initbinder34 public void databinding(webdatabinder binder) {35 binder.addvalidators(uservalidator, emailvalidator);36 simpledateformat dateformat = new simpledateformat(dd/mm/yyyy);37 dateformat.setlenient(false);38 binder.registercustomeditor(date.class, dob, new customdateeditor(dateformat, true));39 }40 41 @requestmapping(value=save, method = requestmethod.post)42 public string createuser(@modelattribute(user) @valid user user,bindingresult result, modelmap model) {43 if(result.haserrors()) {44 return user;45 }46 system.out.println(name:+ user.getname());47 system.out.println(email:+ user.getemail());48 system.out.println(date of birth:+ user.getdob());49 model.addattribute(msg, welcome to my world!);50 return success;51 } 52 }
myworldcontroller
页面表单
<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spring中的webdatabinder如何使用？的详细内容。