Spring Boot默认使用StandardServletMultipartResolver处理Multipart。
对应的使用StandardMultipartFile来接收文件数据。
private static class StandardMultipartFile implements MultipartFile, Serializable { private final Part part; private final String filename; public StandardMultipartFile(Part part, String filename) { this.part = part; this.filename = filename; } @Override public String getName() { return this.part.getName(); } @Override public String getOriginalFilename() { return this.filename; } @Override public String getContentType() { return this.part.getContentType(); } @Override public boolean isEmpty() { return (this.part.getSize() == 0); } @Override public long getSize() { return this.part.getSize(); } @Override public byte[] getBytes() throws IOException { return FileCopyUtils.copyToByteArray(this.part.getInputStream()); } @Override public InputStream getInputStream() throws IOException { return this.part.getInputStream(); } @Override public void transferTo(File dest) throws IOException, IllegalStateException { this.part.write(dest.getPath()); if (dest.isAbsolute() && !dest.exists()) { // Servlet 3.0 Part.write is not guaranteed to support absolute file paths: // may translate the given path to a relative location within a temp dir // (e.g. on Jetty whereas Tomcat and Undertow detect absolute paths). // At least we offloaded the file from memory storage; it'll get deleted // from the temp dir eventually in any case. And for our user's purposes, // we can manually copy it to the requested location as a fallback. FileCopyUtils.copy(this.part.getInputStream(), new FileOutputStream(dest)); } } }
MultipartFile
CommonsMultipartFile
StandardMultipartFile
MultipartResolver
StandardServletMultipartResolver
CommonsMultipartResolver
如果希望用CommonsMultipartFile来接收文件数据
在没有配置multipartResolver为CommonsMultipartResolver,使用CommonsMultipartResolver来处理Multipart,这种情况下,报如下错误:
Failed to convert request element: org.springframework.web.method.annotation.MethodArgumentConversionNotSupportedException: Failed to convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'org.springframework.web.multipart.support.StandardMultipartHttpServletRequest$StandardMultipartFile' to required type 'org.springframework.web.multipart.commons.CommonsMultipartFile': no matching editors or conversion strategy found
如果multipartResolver配置如下:
@Bean(name = "multipartResolver") public CommonsMultipartResolver getCommonsMultipartResolver() { CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(); multipartResolver.setMaxUploadSize(20971520); multipartResolver.setMaxInMemorySize(1048576); return multipartResolver; }
使用CommonsMultipartResolver来处理Multipart,通过CommonsMultipartFile无法接收到文件。
需要关闭Spring Boot的Multipart自动配置
@EnableAutoConfiguration(exclude = {MultipartAutoConfiguration.class})
如果希望用StandardMultipartFile来接收文件数据
org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.StandardMultipartFile#filename
这里获取的文件名如果是中文的话,总是乱码。
/* * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/methods/multipart/FilePart.java,v 1.19 2004/04/18 23:51:37 jsdever Exp $ * $Revision: 480424 $ * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $ * * ==================================================================== * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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 * * http://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. * ==================================================================== * * This software consists of voluntary contributions made by many * individuals on behalf of the Apache Software Foundation. For more * information on the Apache Software Foundation, please see * <http://www.apache.org/>. * */ package org.apache.commons.httpclient.methods.multipart; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import org.apache.commons.httpclient.util.EncodingUtil; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * This class implements a part of a Multipart post object that * consists of a file. * * @author <a href="mailto:[email protected]">Matthew Albright</a> * @author <a href="mailto:[email protected]">Jeff Dever</a> * @author <a href="mailto:[email protected]">Adrian Sutton</a> * @author <a href="mailto:[email protected]">Michael Becke</a> * @author <a href="mailto:[email protected]">Mark Diggory</a> * @author <a href="mailto:[email protected]">Mike Bowler</a> * @author <a href="mailto:[email protected]">Oleg Kalnichevski</a> * * @since 2.0 * */ public class MultipartFilePart extends PartBase { /** Default content encoding of file attachments. */ public static final String DEFAULT_CONTENT_TYPE = "application/octet-stream"; /** Default charset of file attachments. */ public static final String DEFAULT_CHARSET = "ISO-8859-1"; /** Default transfer encoding of file attachments. */ public static final String DEFAULT_TRANSFER_ENCODING = "binary"; /** Log object for this class. */ private static final Log LOG = LogFactory.getLog(MultipartFilePart.class); /** Attachment's file name */ protected static final String FILE_NAME = "; filename="; /** Attachment's file name as a byte array */ private static final byte[] FILE_NAME_BYTES = EncodingUtil.getAsciiBytes(FILE_NAME); /** Source of the file part. */ private PartSource source; /** * FilePart Constructor. * * @param name the name for this part * @param partSource the source for this part * @param contentType the content type for this part, if <code>null</code> the * {@link #DEFAULT_CONTENT_TYPE default} is used * @param charset the charset encoding for this part, if <code>null</code> the * {@link #DEFAULT_CHARSET default} is used */ public MultipartFilePart(String name, PartSource partSource, String contentType, String charset) { super( name, contentType == null ? DEFAULT_CONTENT_TYPE : contentType, charset == null ? "ISO-8859-1" : charset, DEFAULT_TRANSFER_ENCODING ); if (partSource == null) { throw new IllegalArgumentException("Source may not be null"); } this.source = partSource; } /** * FilePart Constructor. * * @param name the name for this part * @param partSource the source for this part */ public MultipartFilePart(String name, PartSource partSource) { this(name, partSource, null, null); } /** * FilePart Constructor. * * @param name the name of the file part * @param file the file to post * * @throws FileNotFoundException if the <i>file</i> is not a normal * file or if it is not readable. */ public MultipartFilePart(String name, File file) throws FileNotFoundException { this(name, new FilePartSource(file), null, null); } /** * FilePart Constructor. * * @param name the name of the file part * @param file the file to post * @param contentType the content type for this part, if <code>null</code> the * {@link #DEFAULT_CONTENT_TYPE default} is used * @param charset the charset encoding for this part, if <code>null</code> the * {@link #DEFAULT_CHARSET default} is used * * @throws FileNotFoundException if the <i>file</i> is not a normal * file or if it is not readable. */ public MultipartFilePart(String name, File file, String contentType, String charset) throws FileNotFoundException { this(name, new FilePartSource(file), contentType, charset); } /** * FilePart Constructor. * * @param name the name of the file part * @param fileName the file name * @param file the file to post * * @throws FileNotFoundException if the <i>file</i> is not a normal * file or if it is not readable. */ public MultipartFilePart(String name, String fileName, File file) throws FileNotFoundException { this(name, new FilePartSource(fileName, file), null, null); } /** * FilePart Constructor. * * @param name the name of the file part * @param fileName the file name * @param file the file to post * @param contentType the content type for this part, if <code>null</code> the * {@link #DEFAULT_CONTENT_TYPE default} is used * @param charset the charset encoding for this part, if <code>null</code> the * {@link #DEFAULT_CHARSET default} is used * * @throws FileNotFoundException if the <i>file</i> is not a normal * file or if it is not readable. */ public MultipartFilePart(String name, String fileName, File file, String contentType, String charset) throws FileNotFoundException { this(name, new FilePartSource(fileName, file), contentType, charset); } /** * Write the disposition header to the output stream * @param out The output stream * @throws IOException If an IO problem occurs * @see Part#sendDispositionHeader(OutputStream) */ protected void sendDispositionHeader(OutputStream out) throws IOException { LOG.trace("enter sendDispositionHeader(OutputStream out)"); super.sendDispositionHeader(out); String filename = this.source.getFileName(); if (filename != null) { out.write(FILE_NAME_BYTES); out.write(QUOTE_BYTES); out.write(EncodingUtil.getBytes(filename, getCharSet())); out.write(QUOTE_BYTES); } } /** * Write the data in "source" to the specified stream. * @param out The output stream. * @throws IOException if an IO problem occurs. * @see org.apache.commons.httpclient.methods.multipart.Part#sendData(OutputStream) */ protected void sendData(OutputStream out) throws IOException { LOG.trace("enter sendData(OutputStream out)"); if (lengthOfData() == 0) { // this file contains no data, so there is nothing to send. // we don't want to create a zero length buffer as this will // cause an infinite loop when reading. LOG.debug("No data to send."); return; } byte[] tmp = new byte[4096]; InputStream instream = source.createInputStream(); try { int len; while ((len = instream.read(tmp)) >= 0) { out.write(tmp, 0, len); } } finally { // we're done with the stream, close it instream.close(); } } /** * Returns the source of the file part. * * @return The source. */ protected PartSource getSource() { LOG.trace("enter getSource()"); return this.source; } /** * Return the length of the data. * @return The length. * @throws IOException if an IO problem occurs * @see org.apache.commons.httpclient.methods.multipart.Part#lengthOfData() */ protected long lengthOfData() throws IOException { LOG.trace("enter lengthOfData()"); return source.getLength(); } }
客户端上传代码:
@Test public void test() { String localFile = "E:\\docs\\装饰模式.bmp"; File file = new File(localFile); // String url = "http://localhost:8081/upload"; String url = "http://localhost:8081/upload?version=1.1"; PostMethod filePost = new PostMethod(url){//这个用来中文乱码 public String getRequestCharSet() { return "UTF-8";// } }; // filePost.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8"); HttpClient client = new HttpClient(); // filePost.setRequestHeader(); try { String secret = UUID.randomUUID().toString(); System.out.println("secret:" + secret); filePost.setParameter("secret", secret); filePost.setParameter("secret", secret); Part[] parts = { new StringPart("newSecret", secret), new StringPart("fileName", "ABC" + file.getName(), "UTF-8"), // "application/octet-stream; charset=ISO-8859-1", "ISO-8859-1" new FilePart("file", file, null, "utf-8") { protected void sendDispositionHeader(OutputStream out) throws IOException { super.sendDispositionHeader(out); String filename = getSource().getFileName(); if (filename != null) { out.write(EncodingUtil.getAsciiBytes(FILE_NAME)); out.write(QUOTE_BYTES); // out.write(EncodingUtil.getBytes(filename, "utf-8")); out.write(EncodingUtil.getBytes(filename, getCharSet())); out.write(QUOTE_BYTES); } } }, // new FilePart(new String(file.getName().getBytes("ISO-8859-1"), "UTF-8"), file) }; filePost.setRequestEntity(new MultipartRequestEntity(parts, filePost.getParams())); client.getHttpConnectionManager().getParams().setConnectionTimeout(5000); int status = client.executeMethod(filePost); if (status == HttpStatus.SC_OK) { System.out.println("SUCCESS"); } else { System.out.println("FAIL: status: " + status); } } catch (Exception ex) { ex.printStackTrace(); } finally { filePost.releaseConnection(); } }