使用SpringMVC的表單驗證

上一篇搭建了基本項目，這一篇在此基礎上加入表單驗證功能。

第一步，添加command類

package?test.bean; ??
??
import?javax.validation.constraints.Size; ??
??
public?class?User?{ ??
??
????@Size(min=3,max=30) ??
????private?String?username; ??
????@Size(min=3,max=30) ??
????private?String?password; ??
????private?String?gender; ??
???? ??
????private?int?age; ??
????private?String?email; ??
????public?String?getUsername()?{ ??
????????return?username; ??
????} ??
????public?void?setUsername(String?username)?{ ??
????????this.username?=?username; ??
????} ??
????public?String?getPassword()?{ ??
????????return?password; ??
????} ??
????public?void?setPassword(String?password)?{ ??
????????this.password?=?password; ??
????} ??
????public?String?getGender()?{ ??
????????return?gender; ??
????} ??
????public?void?setGender(String?gender)?{ ??
????????this.gender?=?gender; ??
????} ??
????public?int?getAge()?{ ??
????????return?age; ??
????} ??
????public?void?setAge(int?age)?{ ??
????????this.age?=?age; ??
????} ??
????public?String?getEmail()?{ ??
????????return?email; ??
????} ??
????public?void?setEmail(String?email)?{ ??
????????this.email?=?email; ??
????}??? ??
}??

package test.bean;import javax.validation.constraints.Size;public class User {@Size(min=3,max=30)private String username;@Size(min=3,max=30)private String password;private String gender;private int age;private String email;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}	
}