使用 hibernate validator 进行表单验证

1 引入依赖，如果是 Maven 项目，仅需要添加如下依赖。官网请查看http://hibernate.org/validator/documentation/getting-started/

<dependency>
   <groupId>org.hibernate</groupId>
   <artifactId>hibernate-validator</artifactId>
   <version>5.4.1.Final</version>
</dependency>

例如要对person 中域进行校验

public class Person {

    Integer id;

    @NotNull(message = "用户名不能为空")
    @Size(min = 5, max = 20, message = "长度在5-20之间")
    String name;

    @NotNull(message = "年龄不能为空")
    Integer age;
    String gender;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                '}';
    }
}

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