Java Spring MVC中对象列表的嵌套表单数据绑定

我有一个这样的目标：

public class FormFields extends BaseObject implements Serializable {

private FieldType fieldType; //checkbox, text, radio
private List<FieldValue> value; //FieldValue contains simple string/int information, id, value, label

//other properties and getter/setters


}

我在谷歌上搜索了这个，搜索了堆栈溢出，找到了registerCustomEditor和类似函数的引用，但我不确定如何正确解决这个问题

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自定义属性编辑器就是这样做的吗？如果是这样的话，它是如何工作的？

我想你的问题是对的。当您执行path=“formFields[${formFieldRow.index}].value”时，您将从表单的每个单选按钮返回一个字符串值，Spring应该知道如何将该字符串值转换为每个FieldValue对象以填充列表值

因此，您需要创建customEditor，并在initbinder中将此编辑器与List类关联：

@InitBinder
public void initBinder(final WebDataBinder binder) {
    binder.registerCustomEditor(FieldValue.class, CustomEditor() ));
}

您的CustomEditor类应该扩展PropertyEditorSupport，如下所示：

public class CustomEditor extends PropertyEditorSupport{  
    public void setAsText(String text) {
        FieldValue field;
        //you have to create a FieldValue object from the string text 
        //which is the one which comes from the form
        //and then setting the value with setValue() method
        setValue(field);
    }
} 

 Failed to convert property value of type [java.lang.String] to required type [java.util.List] for property formFields[11].value; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.lang.String] to required type [com.example.model.FieldValue] for property value[0]: no matching editors or conversion strategy found

@InitBinder
public void initBinder(final WebDataBinder binder) {
    binder.registerCustomEditor(FieldValue.class, CustomEditor() ));
}

public class CustomEditor extends PropertyEditorSupport{  
    public void setAsText(String text) {
        FieldValue field;
        //you have to create a FieldValue object from the string text 
        //which is the one which comes from the form
        //and then setting the value with setValue() method
        setValue(field);
    }
}