Springboot验证异常：org.springFramework.Validation.BeanPropertyBindingResult异常

Question

下面是我的代码：

@RequestMapping(value = "/register", method = RequestMethod.POST)
    public String saveForm(@Valid Users users,Model model,Errors errors) {
        if(errors.hasErrors()) {
            return "registerPage";
        }
        else {
            model.addAttribute("message","Registered................");
        System.out.println("Save Users TEST------------------------------------>");
        userRepository.save(users);

        return "register-success";
        }


    }

这里有个例外：

对象“users”中字段“salary”上的字段错误：拒绝值[null]；代码[NotNull.Users.Salary,NotNull.Salary,NotNull.java.lang.Integer,NotNull]；参数[org.springframework.context.support.defaultmessageSourceResolvable：代码[users.salary,salary]；参数[]；default message[salary]]；默认消息[不能为空]字段“dept”上对象“users”中的字段错误：拒绝值[]；代码[size.users.dept,size.dept,size.java.lang.String,size]；参数[org.springframework.context.support.defaultmessageSourceResolvable：代码[users.dept,dept]；参数[]；默认消息[dept],10,2]；默认消息[长度应介于2到10之间]字段“name”上对象“users”中的字段错误：拒绝值[]；代码[size.users.name,size.name,size.java.lang.String,size]；参数[org.springframework.context.support.defaultmessageSourceResolvable：代码[users.name,name]；参数[]；default message[name],30,2]；默认消息[长度应介于2到30之间]]

public class Users implements Serializable{

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(name="id")
    private Integer id;
    @Column(name="name")
    @NotNull
    @Size(min=2,max=30,message="Length should be in between 2 to 30")
    private String name;

    @Column(name="salary")
    @NotNull
    private Integer salary;
    @Column(name="dept")
    @NotNull
    @Size(min=2,max=10,message="Length should be in between 2 to 10")
    private String dept;

    ....

    }

下面是我的html表单（使用thymeleaf）：

<h1 th:text="${message}" align="center"></h1>
<div class="container">
    <h2>Registration form</h2>
      <form class="form-horizontal" th:object="${registerCommand}" th:action="@{/rest/users/register}" method="post">
        <div class="form-group">
            <label for="name">Username:</label>
             <input type="text"
                class="form-control" id="name" placeholder="Enter Name"
                name="name" th:field="*{name}"> <br />
            <p th:if="${#fields.hasErrors('name')}" th:errors="*{name}" th:field="*{name}"
                class="alert alert-danger"></p>
        </div>
        <div class="form-group">
            <label for="dept">Department:</label>
             <input type="text"
                class="form-control" id="dept" placeholder="Enter Department"
                name="dept" th:field="*{dept}"> <br />
            <p th:if="${#fields.hasErrors('dept')}" th:errors="*{dept}" th:field="*{dept}"
                class="alert alert-danger"></p>
        </div>
        <div class="form-group">
            <label for="salary">Salary:</label> <input type="text"
                class="form-control" id="salary" placeholder="Enter salary"
                name="salary" th:field="*{salary}"> <br />
            <p th:if="${#fields.hasErrors('salary')}" th:errors="*{salary}" th:field="*{salary}"
                class="alert alert-danger"></p>
        </div>

        <button type="submit" class="btn btn-sucess">Submit</button>
    </form>
</div>

Answer 1

找到了我的原因，我没有在我的saveForm控制器中传递正确的参数-

@RequestMapping(value = "/register", method = RequestMethod.POST)
    public String saveForm(@ModelAttribute("registerCommand") @Valid Users users, BindingResult bindingResult, Model model){

        if(bindingResult.hasErrors()) {

            return "registerPage";
        }
        else {
        userRepository.save(users);
        return "register-success";
        }
    }

注意-如果您使用的是BindingResult，它应该正好在bean之后。

只有在顺序重要的情况下才是BindingResult。它必须跟随正在验证的bean，以便Spring知道将任何验证错误放在哪里。