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我在我的项目中使用 Spring MVC 和 Spring 表单验证。对象模型中有一个类命名Group，我创建了用于编辑它的表单。

形式

<spring:url var="saveGroup" value="/teacher/groups/save"/>
<form:form action="${saveGroup}" method="post" modelAttribute="group">

    <form:hidden path="id"/>

    <div id="nameDiv" class="control-group">
        <form:label path="title">Title:</form:label>
        <form:input path="title"/>
        <form:errors path="title"/>
    </div>

    <div id="specDiv" class="control-group">
        <form:label path="title">Specialty:</form:label>
        <form:select path="specialty">
            <form:options items="${specialties}" itemValue="id" itemLabel="title"/>
        </form:select>
    </div>

    <div class="center">
        <spring:url var="groups" value="/teacher/groups"/>
        <input class="btn btn-primary" type="submit" value="Save"/>
        <a class="btn" href="${groups}"> Cancel </a>
    </div>
</form:form>

控制器

@Controller
@RequestMapping("/teacher/groups")
public class GroupsController {

    @Autowired
    private GroupService groupService;
    @Autowired
    private SpecialtyService specialtyService;

    @ModelAttribute("group")
    public Group setGroup(Long id) {
        if (id != null) {
            return groupService.read(id);
        } else {
            return new Group();
        }
    }

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(Specialty.class, "specialty", 
            new SpecialtyEditor(specialtyService));
        binder.setValidator(new GroupValidator());
    }

    @RequestMapping("")
    public ModelAndView groups() {
        return new ModelAndView("teacher/groups/list", "groups", 
            groupService.list());
    }

    @RequestMapping("/edit")
    public ModelAndView editGroup() {
        return new ModelAndView("teacher/groups/edit", "specialties",
            specialtyService.list());
    }

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String saveGroup(@Valid Group group, BindingResult result) {
        if (result.hasErrors()) {
            return "forward:/teacher/groups/edit";
        }
        groupService.update(group);
        return "redirect:/teacher/groups";
    }
}

我想在验证失败的情况下设置表单的适当行为。即它应该保存它的状态，但只显示验证错误消息（如使用 javascript 验证时）。我认为“转发：/teacher/groups/edit”将再次将请求转发到editGroup()保存的对象group和result. 但是当我验证表单失败时，只是重新加载并显示已编辑的开始状态group：没有错误，也没有保存的更改。我怎样才能正确地做到这一点？

谢谢！

4

1 回答 1

0

我通过不将请求转发到其他方法而是立即向用户发送答案来解决问题。现在它可以工作了，看起来像：

@RequestMapping(value = "/save", method = RequestMethod.POST)
public ModelAndView saveGroup(@Valid Group group, BindingResult result) {
    if (result.hasErrors()) {
        return new ModelAndView("/teacher/groups/edit", "specialties", specialtyService.list());
    }
    groupService.update(group);
    return new ModelAndView("redirect:/teacher/groups");
}
于 2013-04-24T18:42:07.750 回答