Question

我有一个jsp页面，如下所示：

<form:form action="userRegistration" name="userRegistrationForm" commandName="userRegistration">

<form:input path="userName"/>
<form:input path="houseNo"/>

</form:form>

以及所有必填字段。

在控制器中我使用如下：

@RequestMapping(method=RequestMethod.GET)
public String registration(ModelMap model,HttpSession session) {
    UserRegistration userRegistration = service.createUserRegistration();
    model.addAttribute("userRegistration",userRegistration);
    return "registrationview";
}


@RequestMapping(method=RequestMethod.POST)
public String getRegistration(UserRegistration userRegistration, HttpSession session, ModelMap model) {
    boolean result = validateAndSaveData(userRegistration);
    if (result){

    }
}

当用户提交表单时，它会到达帖子然后验证输入并保存。如何向视图发送成功消息和错误消息。现有实施中是否需要进行任何更改？

Answer 1

@RequestMapping(method=RequestMethod.POST)
public String getRegistration(UserRegistration userRegistration, HttpSession session, ModelMap model) {
    boolean result = validateAndSaveData(userRegistration);
    if (result){
        model.addAttribute("successMsg", "Form successfully submitted");
        return "successPage";
    }
    else {
        model.addAttribute("errorMsg", "Your form submission contains errors.");
        return "formPage";  
    }
}

我同意Shagaan的看法，你应该考虑使用Spring对JSR-303验证的内置支持来验证表单。这里有一些关于如何做到这一点的信息。首先，使用JSR-303（javax.validation）注释注释您的表单：

public class UserRegistration {

    @NotNull
    @Size(max=7)
    private String name;
    @Min(0)
    private int houseNo;
    ...
}

然后使用“@Valid”在控制器方法中注释您的模型：

@RequestMapping(method=RequestMethod.POST)
public String getRegistration(@Valid UserRegistration userRegistration, BindingResult result, HttpSession session, ModelMap model) {
    if (result.hasErrors()){
        model.addAttribute("errorMsg", "Your form submission contains errors.");
        return "formPage"; 
    }

    model.addAttribute("successMsg", "Form successfully submitted");
    return "successPage";
}

Spring的BindingResult会自动将错误绑定到您的表单对象，因此在您的jsp中，您可以这样做：

<form:form action="userRegistration" name="userRegistrationForm" commandName="userRegistration">

    <form:input path="userName"/> <form:errors path="userName" cssClass="error"/>
    <form:input path="houseNo"/>  <form:errors path="houseNo" cssClass="error"/>

</form:form>

要使用Spring验证，您需要在类路径中使用Validation-api（JSR-303规范）和实现（Hibernate-Validator）。见Spring validation docs

的第6.7节

Answer 2

您可以在请求中保存：model.addAttribute（＆＃34; message＆＃34;，＆＃34; sussess＆＃34;）;

使用spring 3注释发送成功或错误消息进行查看

2 个答案: