springboot整合validate校驗框架
1、實體類添加註解

@NotBlank(message = "name不可為空")
    @Size(min=2, max=10)
    private String name;
    @NotBlank(message = "password不可為空")
    @Size(min=2, max=20)
    private String password;

2、Controller
@valid 與BindingResult聯合使用
注：在addUser（）入參新增User是因為校驗失敗後再次跳轉到userForm頁面時避免頁面報錯。

@RequestMapping("/addUser")
public String addUser(User user){
    return "/user/userForm";
}

@RequestMapping("/userForm")
public String userForm(**@Valid** User user , BindingResult result){
    if(result.hasErrors()){
        System.out.println(result.toString());
        return "/user/userForm";
    }
    userService.addUser(user);
    return "/user/userList";
}
 

3、前端

<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<form:form modelAttribute="user" action="/userForm" method="post">
   <p>
        <form:input path="name" size="30"/>
        <form:errors path="name" cssClass="error" cssStyle="color:red"></form:errors>
    </p>
    <p>
        <form:input path="password" size="30"/>
        <form:errors path="password" cssClass="error" cssStyle="color:red"></form:errors>
    </p>
    <p>
        <input type="submit" value="validate"/>
    </p>
</form:form>