java Upload file a case in point. Use the apache third-party open-source components.

FileUploadDemo
..............\.classpath
..............\.mymetadata
..............\.project
..............\src
..............\...\org
..............\...\...\apache
..............\...\...\......\commons
..............\...\...\......\.......\fileupload
..............\...\...\......\.......\..........\DefaultFileItem.java
..............\...\...\......\.......\..........\DefaultFileItemFactory.java
..............\...\...\......\.......\..........\disk
..............\...\...\......\.......\..........\....\DiskFileItem.java
..............\...\...\......\.......\..........\....\DiskFileItemFactory.java
..............\...\...\......\.......\..........\....\package.html
..............\...\...\......\.......\..........\DiskFileUpload.java
..............\...\...\......\.......\..........\FileItem.java
..............\...\...\......\.......\..........\FileItemFactory.java
..............\...\...\......\.......\..........\FileUpload.java
..............\...\...\......\.......\..........\FileUploadBase.java
..............\...\...\......\.......\..........\FileUploadException.java
..............\...\...\......\.......\..........\MultipartStream.java
..............\...\...\......\.......\..........\package.html
..............\...\...\......\.......\..........\ParameterParser.java
..............\...\...\......\.......\..........\RequestContext.java
..............\...\...\......\.......\..........\servlet
..............\...\...\......\.......\..........\.......\package.html
..............\...\...\......\.......\..........\.......\ServletFileUpload.java
..............\...\...\......\.......\..........\.......\ServletRequestContext.java
..............\...\...\......\.......\io
..............\...\...\......\.......\..\CopyUtils.java
..............\...\...\......\.......\..\EndianUtils.java
..............\...\...\......\.......\..\FileCleaner.java
..............\...\...\......\.......\..\filefilter
..............\...\...\......\.......\..\..........\AbstractFileFilter.java
..............\...\...\......\.......\..\..........\AgeFileFilter.java
..............\...\...\......\.......\..\..........\AndFileFilter.java
..............\...\...\......\.......\..\..........\ConditionalFileFilter.java
..............\...\...\......\.......\..\..........\DelegateFileFilter.java
..............\...\...\......\.......\..\..........\DirectoryFileFilter.java
..............\...\...\......\.......\..\..........\FalseFileFilter.java
..............\...\...\......\.......\..\..........\FileFilterUtils.java
..............\...\...\......\.......\..\..........\IOFileFilter.java
..............\...\...\......\.......\..\..........\NameFileFilter.java
..............\...\...\......\.......\..\..........\NotFileFilter.java
..............\...\...\......\.......\..\..........\OrFileFilter.java
..............\...\...\......\.......\..\..........\package.html
..............\...\...\......\.......\..\..........\PrefixFileFilter.java
..............\...\...\......\.......\..\..........\SizeFileFilter.java
..............\...\...\......\.......\..\..........\SuffixFileFilter.java
..............\...\...\......\.......\..\..........\TrueFileFilter.java
..............\...\...\......\.......\..\..........\WildcardFilter.java
..............\...\...\......\.......\..\FilenameUtils.java
..............\...\...\......\.......\..\FileSystemUtils.java
..............\...\...\......\.......\..\FileUtils.java
..............\...\...\......\.......\..\HexDump.java
..............\...\...\......\.......\..\input
..............\...\...\......\.......\..\.....\ClassLoaderObjectInputStream.java
..............\...\...\......\.......\..\.....\CountingInputStream.java
..............\...\...\......\.......\..\.....\DemuxInputStream.java
..............\...\...\......\.......\..\.....\package.html
..............\...\...\......\.......\..\.....\ProxyInputStream.java
..............\...\...\......\.......\..\.....\ProxyReader.java
..............\...\...\......\.......\..\.....\SwappedDataInputStream.java
..............\...\...\......\.......\..\IOUtils.java
..............\...\...\......\.......\..\LineIterator.java

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