表單數據未使用Spring控制器註釋獲得新的對象綁定提交

Question

我不是在春天控制器獲取表單數據提交以下表單後，後是我的代碼

@RequestMapping(value = "category/addCategory.htm" , method = RequestMethod.GET) 
public String add(Model model) { 
    if (log.isDebugEnabled()){ 
     log.debug("Invoking listCategory"); 
    } 
    model.addAttribute("categoryView", new CategoryView()); 
    return "editCategory"; 
} 

@RequestMapping(value = "category/saveCategory.htm", method = RequestMethod.POST) 
public String saveCategory(CategoryView categoryView, Model model, BindingResult result) { 

    Category category = prepareCategoryFromView(categoryView); 

    categoryService.save(category); 
    categoryView.setCategoryId(category.getCategoryId()); 
    model.addAttribute("categoryView",categoryView); 
    return "editCategory"; 
} 

prepareCategoryFromView是被設定的實際值的方法在類別它的休眠實體，以下類別查看

public class CategoryView { 
private long categoryId; 
private String image = ""; 
private int parentId; 
private boolean top; 
private int column = 1; 
private int sortOrder = 1; 
private boolean status; 
private String description; 
private String name; 
. 
. 
other variable and setter and getters 
} 

和形式是

<sf:form method="post" enctype="multipart/form-data" id="form-category" cssClass="form-horizontal" modelAttribute="categoryView"> 
<sf:label path="name" cssClass="col-sm-2 control-label">Category Name</sf:label> 
<sf:input path="name" id="name" name="name" cssClass="form-control" placeholder="Category Name" /> 
<sf:hidden path="categoryId" id="categoryId" name="categoryId" /> 
<sf:hidden path="languageId" id="languageId" name="languageId" /> 
<sf:label path="description" cssClass="col-sm-2 control-label">Category Name</sf:label> 
<sf:textarea path="description" cssClass="form-control" placeholder="Description" id="description"/> 
. 
. 
. 
</sf:form> 

在上述表單中的每個我得到的名稱和說明時間爲空（我認爲這是創建一個新的視圖對象，而不在形式給出的值）

請讓我知道，在這裏我錯了

Answer 1

從form標籤取下enctype="multipart/form-data"，然後再試一次（以正確的順序方法參數）。 @ModelAttribute不是嚴格要求的，因爲您的屬性名稱與類名匹配。

Answer 2

我覺得@ModelAttribute在CategoryView上缺少註釋。因爲按照您的表單代碼，它是將數據綁定到控制器中的bean的模型屬性。

用下面的方法參數附加它，然後你可以檢查數據是否綁定到它。

@RequestMapping(value = "category/saveCategory.htm", method = RequestMethod.POST) 
public String saveCategory(@ModelAttribute("categoryView") CategoryView categoryView, Model model, BindingResult result) { 

    Category category = prepareCategoryFromView(categoryView); 

    categoryService.save(category); 
    categoryView.setCategoryId(category.getCategoryId()); 
    model.addAttribute("categoryView",categoryView); 
    return "editCategory"; 
}