文件上传intercepter中，如果是修改，对为修改的文件不做校验

src/main/java/com/nis/interceptor/MultipartFileIntercepter.java

@@ -5,11 +5,16 @@ import static java.lang.String.format;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.UnsupportedEncodingException;
+import java.nio.charset.Charset;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 import java.util.Properties;
 
 import javax.servlet.http.HttpServletRequest;
 
+import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.FileUpload;
 import org.apache.commons.fileupload.FileUploadBase;
 import org.apache.commons.fileupload.FileUploadException;
@@ -19,10 +24,14 @@ import org.apache.commons.fileupload.servlet.ServletFileUpload;
 import org.apache.commons.fileupload.servlet.ServletRequestContext;
 import org.apache.log4j.Logger;
 import org.springframework.context.i18n.LocaleContextHolder;
+import org.springframework.http.MediaType;
+import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
+import org.springframework.util.StringUtils;
 import org.springframework.web.multipart.MultipartException;
 import org.springframework.web.multipart.MultipartFile;
 import org.springframework.web.multipart.commons.CommonsFileUploadSupport;
+import org.springframework.web.multipart.commons.CommonsMultipartFile;
 import org.springframework.web.multipart.commons.CommonsMultipartResolver;
 
 import com.nis.exceptions.MultiPartNewException;
@@ -48,7 +57,6 @@ public class MultipartFileIntercepter extends CommonsMultipartResolver{
 	    		if(isSampleFileUpload || isDigestFileUpload){
 	    			/*****************预先获取上传文件的总的大小************/
 			    	FileUpload fileUploadTotal = fileUpload;
-			    	
 			    	ServletRequestContext ctx = new ServletRequestContext(request);
 			    	InputStream input=ctx.getInputStream();
 			        @SuppressWarnings("deprecation") // still has to be backward compatible
@@ -166,5 +174,66 @@ public class MultipartFileIntercepter extends CommonsMultipartResolver{
 		}
 		return msgProp;
 	}
+	protected CommonsFileUploadSupport.MultipartParsingResult parseFileItems(List<FileItem> fileItems, String encoding) {
+		MultiValueMap<String, MultipartFile> multipartFiles = new LinkedMultiValueMap<String, MultipartFile>();
+		Map<String, String[]> multipartParameters = new HashMap<String, String[]>();
+		Map<String, String> multipartParameterContentTypes = new HashMap<String, String>();
+
+		// Extract multipart files and multipart parameters.
+		for (FileItem fileItem : fileItems) {
+			if (fileItem.isFormField()) {
+				String value;
+				String partEncoding = determineEncoding(fileItem.getContentType(), encoding);
+				if (partEncoding != null) {
+					try {
+						value = fileItem.getString(partEncoding);
+					}
+					catch (UnsupportedEncodingException ex) {
+						if (logger.isDebugEnabled()) {
+							logger.warn("Could not decode multipart item '" + fileItem.getFieldName() +
+									"' with encoding '" + partEncoding + "': 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
+				CommonsMultipartFile file = new CommonsMultipartFile(fileItem);
+				if(!StringUtils.isEmpty(file.getOriginalFilename())){
+					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);
+	}
+	
+	private String determineEncoding(String contentTypeHeader, String defaultEncoding) {
+		if (!StringUtils.hasText(contentTypeHeader)) {
+			return defaultEncoding;
+		}
+		MediaType contentType = MediaType.parseMediaType(contentTypeHeader);
+		Charset charset = contentType.getCharSet();
+		return (charset != null ? charset.name() : defaultEncoding);
+	}
 	
 }