com.rt.web.multipart.GFileUploadSupport Maven / Gradle / Ivy
package com.rt.web.multipart;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.util.WebUtils;
import java.io.UnsupportedEncodingException;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*
* make it work in GAE.
*
* Base class for multipart resolvers that use Jakarta Commons FileUpload 1.1 or higher.
*
*
* Provides common configuration properties and parsing functionality for multipart requests, using a Map of Spring
* GMultipartFile instances as representation of uploaded files and a String-based parameter Map as representation of
* uploaded form fields.
*
*
* Subclasses implement concrete resolution strategies for Servlet environments: see GMultipartResolver. This base class
* is not tied to those APIs, factoring out common functionality.
*
* @author kernel164
* @author Juergen Hoeller
* @see GMultipartFile
* @see GMultipartResolver
*/
public abstract class GFileUploadSupport {
protected final Log logger = LogFactory.getLog(getClass());
private final GFileItemFactory fileItemFactory;
private final FileUpload fileUpload;
/**
* Instantiate a new GFileUploadSupport with its corresponding FileItemFactory and FileUpload instances.
*
* @see #newFileItemFactory
* @see #newFileUpload
*/
public GFileUploadSupport() {
this.fileItemFactory = newFileItemFactory();
this.fileUpload = newFileUpload(getFileItemFactory());
}
/**
* Return the underlying GFileItemFactory instance. There is
* hardly any need to access this.
*
* @return the underlying GFileItemFactory instance
*/
public GFileItemFactory getFileItemFactory() {
return this.fileItemFactory;
}
/**
* Return the underlying org.apache.commons.fileupload.FileUpload instance. There is hardly any need to
* access this.
*
* @return the underlying FileUpload instance
*/
public FileUpload getFileUpload() {
return this.fileUpload;
}
/**
* Set the maximum allowed size (in bytes) before uploads are refused. -1 indicates no limit (the default).
* Sets the maximum in memory thresold limit to max upload size.
*
* @param maxUploadSize the maximum upload size allowed
*/
public void setMaxUploadSize(int maxUploadSize) {
this.fileUpload.setSizeMax(maxUploadSize);
this.fileItemFactory.setSizeThreshold(maxUploadSize);
}
/**
* Set the default character encoding to use for parsing requests, to be applied to headers of individual parts and
* to form fields. Default is ISO-8859-1, according to the Servlet spec.
*
* If the request specifies a character encoding itself, the request encoding will override this setting. This also
* allows for generically overriding the character encoding in a filter that invokes the
* ServletRequest.setCharacterEncoding method.
*
* @param defaultEncoding the character encoding to use
* @see javax.servlet.ServletRequest#getCharacterEncoding
* @see javax.servlet.ServletRequest#setCharacterEncoding
* @see WebUtils#DEFAULT_CHARACTER_ENCODING
* @see org.apache.commons.fileupload.FileUploadBase#setHeaderEncoding
*/
public void setDefaultEncoding(String defaultEncoding) {
this.fileUpload.setHeaderEncoding(defaultEncoding);
}
/**
* Returns the default encoding.
*
* @return the default encoding.
*/
protected String getDefaultEncoding() {
String encoding = getFileUpload().getHeaderEncoding();
if (encoding == null) {
encoding = WebUtils.DEFAULT_CHARACTER_ENCODING;
}
return encoding;
}
/**
* Factory method for a Commons GFileItemFactory instance.
*
*
Default implementation returns a standard GFileItemFactory. Can be overridden to use a custom subclass, e.g.
* for testing purposes.
*
* @return the new DiskFileItemFactory instance
*/
protected GFileItemFactory newFileItemFactory() {
return new GFileItemFactory();
}
/**
* Factory method for a Commons FileUpload instance.
*
* To be implemented by subclasses.
*
* @param fileItemFactory the Commons FileItemFactory to build upon
* @return the Commons FileUpload instance
*/
protected abstract FileUpload newFileUpload(FileItemFactory fileItemFactory);
/**
* Determine an appropriate FileUpload instance for the given encoding.
*
* Default implementation returns the shared FileUpload instance if the encoding matches, else creates a new
* FileUpload instance with the same configuration other than the desired encoding.
*
* @param encoding the character encoding to use
* @return an appropriate FileUpload instance.
*/
protected FileUpload prepareFileUpload(String encoding) {
FileUpload fileUpload = getFileUpload();
FileUpload actualFileUpload = fileUpload;
// Use new temporary FileUpload instance if the request specifies
// its own encoding that does not match the default encoding.
if (encoding != null && !encoding.equals(fileUpload.getHeaderEncoding())) {
actualFileUpload = newFileUpload(getFileItemFactory());
actualFileUpload.setSizeMax(fileUpload.getSizeMax());
actualFileUpload.setHeaderEncoding(encoding);
}
return actualFileUpload;
}
/**
* Parse the given List of Commons FileItems into a Spring MultipartParsingResult, containing Spring MultipartFile
* instances and a Map of multipart parameter.
*
* @param fileItems the Commons FileIterms to parse
* @param encoding the encoding to use for form fields
* @return the Spring MultipartParsingResult
*/
protected MultipartParsingResult parseFileItems(List fileItems, String encoding) {
MultiValueMap multipartFiles = new LinkedMultiValueMap();
Map multipartParameters = new HashMap();
Map multipartParameterContentTypes = new HashMap();
// Extract multipart files and multipart parameters.
for (FileItem fileItem : fileItems) {
if (fileItem.isFormField()) {
String value = null;
if (encoding != null) {
try {
value = fileItem.getString(encoding);
} catch (UnsupportedEncodingException ex) {
if (logger.isWarnEnabled()) {
logger.warn("Could not decode multipart item '" + fileItem.getFieldName() + "' with encoding '" + encoding + "': using platform default");
}
value = fileItem.getString();
}
} else {
value = fileItem.getString();
}
String[] curParam = multipartParameters.get(fileItem.getFieldName());
if (curParam == null) {
// simple form field
multipartParameters.put(fileItem.getFieldName(), new String[] { value });
} else {
// array of simple form fields
String[] newParam = StringUtils.addStringToArray(curParam, value);
multipartParameters.put(fileItem.getFieldName(), newParam);
}
multipartParameterContentTypes.put(fileItem.getFieldName(), fileItem.getContentType());
} else {
// multipart file field
GMultipartFile file = new GMultipartFile(fileItem);
multipartFiles.add(file.getName(), file);
if (logger.isDebugEnabled()) {
logger.debug("Found multipart file [" + file.getName() + "] of size " + file.getSize() +
" bytes with original filename [" + file.getOriginalFilename() + "], stored " +
file.getStorageDescription());
}
}
}
return new MultipartParsingResult(multipartFiles, multipartParameters, multipartParameterContentTypes);
}
/**
* Cleanup the Spring MultipartFiles created during multipart parsing.
*
* Deletes the underlying Commons FileItem instances.
*
* @param multipartFiles Collection of MultipartFile instances
* @see org.apache.commons.fileupload.FileItem#delete()
*/
protected void cleanupFileItems(Collection multipartFiles) {
for (MultipartFile file : multipartFiles) {
if (file instanceof GMultipartFile) {
GMultipartFile cmf = (GMultipartFile) file;
cmf.getFileItem().delete();
if (logger.isDebugEnabled()) {
logger.debug("Cleaning up multipart file [" + cmf.getName() + "] with original filename [" + cmf.getOriginalFilename() + "], stored " + cmf.getStorageDescription());
}
}
}
}
/**
* Holder for a Map of Spring MultipartFiles and a Map of multipart parameters.
*/
protected static class MultipartParsingResult {
private final MultiValueMap multipartFiles;
private final Map multipartParameters;
private final Map multipartParameterContentTypes;
/**
* Create a new MultipartParsingResult.
*
* @param mpFiles Map of field name to MultipartFile instance
* @param mpParams Map of field name to form field String value
* @param mpParamContentTypes mpParamContentTypes
*/
public MultipartParsingResult(MultiValueMap mpFiles, Map mpParams,
Map mpParamContentTypes) {
this.multipartFiles = mpFiles;
this.multipartParameters = mpParams;
this.multipartParameterContentTypes = mpParamContentTypes;
}
/**
* Return the multipart files as Map of field name to MultipartFile instance.
*
* @return MultiValueMap
*/
public MultiValueMap getMultipartFiles() {
return this.multipartFiles;
}
/**
* Return the multipart parameters as Map of field name to form field String value.
*
* @return Map
*/
public Map getMultipartParameters() {
return this.multipartParameters;
}
/**
* Return the multipart parametersContentTypes as Map of field name to form field String value.
*
* @return Map
*/
public Map getMultipartParameterContentTypes() {
return this.multipartParameterContentTypes;
}
}
}