Package org.springframework.web.bind.support

Class WebRequestDataBinder

java.lang.Object
org.springframework.validation.DataBinder
org.springframework.web.bind.WebDataBinder
org.springframework.web.bind.support.WebRequestDataBinder
All Implemented Interfaces:
PropertyEditorRegistry, TypeConverter
public class WebRequestDataBinder extends WebDataBinder
Special DataBinder to perform data binding from web request parameters to JavaBeans, including support for multipart files.

See the DataBinder/WebDataBinder superclasses for customization options, which include specifying allowed/required fields, and registering custom property editors.

Can also used for manual data binding in custom web controllers or interceptors that build on Spring's WebRequest abstraction: e.g. in a WebRequestInterceptor implementation. Simply instantiate a WebRequestDataBinder for each binding process, and invoke bind with the current WebRequest as argument: 

 MyBean myBean = new MyBean();
 // apply binder to custom target object
 WebRequestDataBinder binder = new WebRequestDataBinder(myBean);
 // register custom editors, if desired
 binder.registerCustomEditor(...);
 // trigger actual binding of request parameters
 binder.bind(request);
 // optionally evaluate binding errors
 Errors errors = binder.getErrors();
 ...
Since:
2.5.2
Author:
Juergen Hoeller, Brian Clozel
See Also:

  • Constructor Details

    • WebRequestDataBinder

      public WebRequestDataBinder(@Nullable Object target)
      Create a new WebRequestDataBinder instance, with default object name.
      Parameters:
      target - the target object to bind onto (or null if the binder is just used to convert a plain parameter value)
      See Also:

    • WebRequestDataBinder

      public WebRequestDataBinder(@Nullable Object target, String objectName)
      Create a new WebRequestDataBinder instance.
      Parameters:
      target - the target object to bind onto (or null if the binder is just used to convert a plain parameter value)
      objectName - the name of the target object

  • Method Details

    • bind

      public void bind(WebRequest request)
      Bind the parameters of the given request to this binder's target, also binding multipart files in case of a multipart request.

      This call can create field errors, representing basic binding errors like a required field (code "required"), or type mismatch between value and bean property (code "typeMismatch").

      Multipart files are bound via their parameter name, just like normal HTTP parameters: i.e. "uploadedFile" to an "uploadedFile" bean property, invoking a "setUploadedFile" setter method.

      The type of the target property for a multipart file can be Part, MultipartFile, byte[], or String. The latter two receive the contents of the uploaded file; all metadata like original file name, content type, etc are lost in those cases.

      Parameters:
      request - the request with parameters to bind (can be multipart)
      See Also:

    • closeNoCatch

      public void closeNoCatch() throws BindException
      Treats errors as fatal.

      Use this method only if it's an error if the input isn't valid. This might be appropriate if all input is from dropdowns, for example.

      Throws:
      BindException - if binding errors have been encountered