RequestDataValueProcessor (Spring Framework 4.3.30.RELEASE API)

```
public interface RequestDataValueProcessor
```
A contract for inspecting and potentially modifying request data values such as URL query parameters or form field values before they are rendered by a view or before a redirect.
Implementations may use this contract for example as part of a solution to provide data integrity, confidentiality, protection against cross-site request forgery (CSRF), and others or for other tasks such as automatically adding a hidden field to all forms and URLs.
View technologies that support this contract can obtain an instance to delegate to via RequestContext.getRequestDataValueProcessor().
从以下版本开始:
3.1
作者:
Rossen Stoyanchev

方法概要

所有方法实例方法抽象方法
修饰符和类型	方法	说明
`Map<String,String>`	`getExtraHiddenFields(HttpServletRequest request)`	Invoked after all form fields have been rendered.
`String`	`processAction(HttpServletRequest request, String action, String httpMethod)`	Invoked when a new form action is rendered.
`String`	`processFormFieldValue(HttpServletRequest request, String name, String value, String type)`	Invoked when a form field value is rendered.
`String`	`processUrl(HttpServletRequest request, String url)`	Invoked when a URL is about to be rendered or redirected to.

- 方法详细资料
  - processAction
```
String processAction(HttpServletRequest request,
                     String action,
                     String httpMethod)
```
    Invoked when a new form action is rendered.
    参数:
    request - the current request
    action - the form action
    httpMethod - the form HTTP method
    返回:
    the action to use, possibly modified
  - processFormFieldValue
```
String processFormFieldValue(HttpServletRequest request,
                             String name,
                             String value,
                             String type)
```
    Invoked when a form field value is rendered.
    参数:
    request - the current request
    name - the form field name
    value - the form field value
    type - the form field type ("text", "hidden", etc.)
    返回:
    the form field value to use, possibly modified
  - getExtraHiddenFields
```
Map<String,String> getExtraHiddenFields(HttpServletRequest request)
```
    Invoked after all form fields have been rendered.
    参数:
    request - the current request
    返回:
    additional hidden form fields to be added, or null
  - processUrl
```
String processUrl(HttpServletRequest request,
                  String url)
```
    Invoked when a URL is about to be rendered or redirected to.
    参数:
    request - the current request
    url - the URL value
    返回:
    the URL to use, possibly modified