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  • Spring MVC 表单验证

    1. 基于 JSR-303(一个数据验证的规范):

     
    import javax.validation.constraints.Min;
    import javax.validation.constraints.NotNull;
    import org.hibernate.validator.constraints.NotBlank;
     
    public class User {
     
        private String username;
       
        private String password;
       
        private int age;
     
        @NotBlank(message="用户名不能为空")
        public String getUsername() {
           return username;
        }
     
        public void setUsername(String username) {
           this.username = username;
        }
     
        @NotNull(message="密码不能为null")
        public String getPassword() {
           return password;
        }
     
        public void setPassword(String password) {
           this.password = password;
        }
     
        @Min(value=10, message="年龄的最小值为10")
        public int getAge() {
           return age;
        }
     
        public void setAge(int age) {
           this.age = age;
        }
       
    }
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context-3.0.xsd
         http://www.springframework.org/schema/mvc
         http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
        
        <mvc:annotation-driven/>
    </beans>
    import javax.validation.Valid;
    import org.springframework.stereotype.Controller;
    import org.springframework.validation.BindingResult;
    import org.springframework.web.bind.annotation.RequestMapping;
     
    @Controller
    public class UserController {
     
        @RequestMapping("login")
        public String login(@Valid User user, BindingResult result) {
           if (result.hasErrors())
               return "user/login";
           return "redirect:/";
        }
       
    }

    使用@NotBlank等注解,然后在要验证的地方使用@Valid 标签。最后验证的结果是在BindingResult 获取,注意据说result 要紧挨着前面的@Valid,而且是一个验证一个BindingResult参数。

    2. 还有就是继承Validator 接口。

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  • 原文地址:https://www.cnblogs.com/ranger2016/p/3795728.html
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