使用SpringMVC的表单验证

上一篇搭建了基本项目，这一篇在此基础上加入表单验证功能。

第一步，添加command类

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;}	
}