org.springframework.web.bind.ServletRequestDataBinder Maven / Gradle / Ivy
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.bind;
import javax.servlet.ServletRequest;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.lang.Nullable;
import org.springframework.validation.BindException;
import org.springframework.web.multipart.MultipartRequest;
import org.springframework.web.util.WebUtils;
/**
* Special {@link org.springframework.validation.DataBinder} to perform data binding
* from servlet 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 be used for manual data binding in custom web controllers:
* for example, in a plain Controller implementation or in a MultiActionController
* handler method. Simply instantiate a ServletRequestDataBinder for each binding
* process, and invoke {@code bind} with the current ServletRequest as argument:
*
*
* MyBean myBean = new MyBean();
* // apply binder to custom target object
* ServletRequestDataBinder binder = new ServletRequestDataBinder(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();
* ...
*
* @author Rod Johnson
* @author Juergen Hoeller
* @see #bind(javax.servlet.ServletRequest)
* @see #registerCustomEditor
* @see #setAllowedFields
* @see #setRequiredFields
* @see #setFieldMarkerPrefix
*/
public class ServletRequestDataBinder extends WebDataBinder {
/**
* Create a new ServletRequestDataBinder instance, with default object name.
* @param target the target object to bind onto (or {@code null}
* if the binder is just used to convert a plain parameter value)
* @see #DEFAULT_OBJECT_NAME
*/
public ServletRequestDataBinder(@Nullable Object target) {
super(target);
}
/**
* Create a new ServletRequestDataBinder instance.
* @param target the target object to bind onto (or {@code null}
* if the binder is just used to convert a plain parameter value)
* @param objectName the name of the target object
*/
public ServletRequestDataBinder(@Nullable Object target, String objectName) {
super(target, objectName);
}
/**
* 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 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.
* @param request the request with parameters to bind (can be multipart)
* @see org.springframework.web.multipart.MultipartHttpServletRequest
* @see org.springframework.web.multipart.MultipartFile
* @see #bind(org.springframework.beans.PropertyValues)
*/
public void bind(ServletRequest request) {
MutablePropertyValues mpvs = new ServletRequestParameterPropertyValues(request);
MultipartRequest multipartRequest = WebUtils.getNativeRequest(request, MultipartRequest.class);
if (multipartRequest != null) {
bindMultipart(multipartRequest.getMultiFileMap(), mpvs);
}
addBindValues(mpvs, request);
doBind(mpvs);
}
/**
* Extension point that subclasses can use to add extra bind values for a
* request. Invoked before {@link #doBind(MutablePropertyValues)}.
* The default implementation is empty.
* @param mpvs the property values that will be used for data binding
* @param request the current request
*/
protected void addBindValues(MutablePropertyValues mpvs, ServletRequest request) {
}
/**
* 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 ServletRequestBindingException subclass of ServletException on any binding problem
*/
public void closeNoCatch() throws ServletRequestBindingException {
if (getBindingResult().hasErrors()) {
throw new ServletRequestBindingException(
"Errors binding onto object '" + getBindingResult().getObjectName() + "'",
new BindException(getBindingResult()));
}
}
}