Question

我在Spring中有一个选择倍数：

<form:select  path="categoryProducts" id="destinationData" itemLabel="product.name" items="${categoryProducts}" itemValue="product.id" multiple="true" ondblclick="moveLeft(document.getElementById('destinationData'), document.getElementById('sourceData'))"  size="10" />

在我的控制器中：

@InitBinder
  public void initBinder(WebDataBinder binder){
    binder.registerCustomEditor(Set.class, "categoryProducts", new CustomCollectionEditor(Set.class)
    {
      @Override
      protected Object convertElement(Object element)
      {
          Product  p = new Product() ;
         try {

             Short id = new Short(String.valueOf(element));
              p = (Product) dataManager.find(Product.class, id);
             System.out.println(p.getId() + "\\" +p.getName());
             CategoryProduct c = new CategoryProduct ();
             c.setProduct(p);
             return c;

        } catch (Exception e) {
            e.printStackTrace();
        }
        return p;
      }


    });

当我提交时，收到此日志：

136 Product Name
105 Product Name
104 Product Name
211 Product Name
204 Product Name
409 Product Name
30/03/2011 07:32:20 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() para servlet cms lanzó excepción
org.springframework.validation.BindException: org.springframework.validation.BeanPropertyBindingResult: 1 errors
Field error in object 'category' on field 'categoryProducts': rejected value [136,105,104,211,204,409][type

initiBinder初始化，但最后抛出异常:(被拒绝的值[136,105,104,211,204,409]）。为什么呢？

Answer 1

您的命令类（模型属性）的字段“categoryProducts”很可能是

Set<String>

...或除CategoryProduct以外的任何类的集合。尝试将其更改为：

Set<CategoryProduct>

我的Spring CustomCollectionEditor实现，没有正确绑定

1 个答案: