Question

我是Spring的新手，我试图创建简单的表单示例，我有一个问题

当我点击提交并接收输入值并使其有效时，在控制器中：

@Valid Student student

我总是空值...我尝试更改映射，阅读帖子Spring MVC form input value is always null但没有任何帮助：（

我的控制器：

@Controller
@RequestMapping({"/rejestracja"})
public class RejestracjaController {

@Autowired
private StudentService studentService;

@RequestMapping(method=RequestMethod.GET)
public String rejestracjaSetup (Model model) {
    model.addAttribute("student",new Student());
    return "rejestracjaPage";
}


@RequestMapping(method=RequestMethod.POST)
public String dodajStuenta (@Valid Student student, BindingResult bindingResult) {
    System.out.println("------");
    System.out.print(student.getFirstname());
    System.out.print("=====");
    System.out.print(student.getLastname());
    System.out.print("=====");
    System.out.print(student.getYearLevel());
    System.out.print("=====");
    if (bindingResult.hasErrors()) {
        return "rejestracjaPage";
    }
    return "redirect:/list";
}
}

我的.jsp：

<form:form method="POST" commandName="student">
<table>
    <tr>
        <td>First name</td>
        <td>
            <form:input path="firstname"/>
            <form:errors path="firstname"/>
        </td>
    </tr>

    <tr>
        <td>Last name</td>
        <td>
            <form:input path="lastname"/>
            <form:errors path="lastname"/>
        </td>
    </tr>

    <tr>
        <td>yearLevel</td>
        <td>
            <form:input path="yearLevel"/>
            <form:errors path="yearLevel"/>
        </td>
    </tr>

    <tr>
        <td>&nbsp;</td>
        <td><input type="submit" value="Register"></td>
    </tr>
</table>
</form:form>

模特：

@Entity
public class Student {

@Id
@Column
@GeneratedValue(strategy = GenerationType.AUTO)
private int studentId;

@Column
@NotNull
    @Size(min = 6)
private String firstname;

@Column
@Length(min=3, max=50, message="Example message1")
private String lastname;

@Column
@Min(value = 1, message = "Example message2")
private int yearLevel;

public Student() {
}

   ....
    getters and setters
   .... 
}

我做错了什么？

Answer 1

验证不是（还）您的问题。你的问题是空Student bean。尝试将其与@ModelAttribute绑定：

@RequestMapping(method=RequestMethod.POST)
public String dodajStuenta (
        @Valid @ModelAttribute("student") Student student,
        BindingResult bindingResult) {

}

Spring 3 MVC和JSR303 @Valid返回空值

1 个答案: