@Valid（jsr 303）沒有在Spring mvc 3.0中工作

Question

我試圖通過使用一個簡單的登錄用例在Spring 3.0中實現JSR 303 bean驗證。 問題是如果我提交沒有任何值的表單，驗證沒有發生（即BindingResult方法hasErrors（）總是返回'false'並且打印我很酷！ 。以下是代碼片段：

@Controller
public class AnnotatedController {
    @RequestMapping(value = "login")
    public String validateLogin(@Valid LoginForm loginForm, BindingResult result, HttpServletRequest request) {
        if(result.hasErrors())
            System.out.println("Got Errors !");
        else
            System.out.println("I'm cool !");
        return "login";
    }
}

bean看起來像這樣：

    public class LoginForm {
    @NotEmpty
    private String userName;
    @Size(min=2, max=3)
    private String password;

    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

最后看法：

<table>
    <form:form action="login.htm" modelAttribute="loginForm">
        <tr>
            <td>User :</td>
            <td><form:input path="userName" /></td>
        </tr>
        <tr>
            <td>Password :</td>
            <td><form:input path="password" /></td>
        </tr>
        <tr><td><input type="submit" value="Ok"> </tr>
    </form:form>
</table>

我錯過了什么？

Answer 1

在servlet上下文XML中添加<mvc:annotation-driven/>為我解決了這個問題。

Answer 2

你缺少表單錯誤標簽。如

<table>
<form:form action="login.htm" commandName="logindetails">
    <tr>
        <td>User :</td>
        <td><form:input path="userName" /></td>
        <td><form:errors path="userName" /></td>
    </tr>
    <tr>
        <td>Password :</td>
        <td><form:input path="password" /></td>
        <td><form:errors path="password"  /></td>
    </tr>
    <tr><td><input type="submit" value="Ok"> </tr>
</form:form>

並且您還必須使用錯誤消息維護屬性文件。

NotEmpty.logindetails.userName = userName is required!
Range.logindetails.password= password value must be between 2 and 3

示例：單擊此處