commons-FileUpload上传�q�程

jack zhai — Wed, 23 Mar 2011 05:01:00 GMT

1�?/p>

ServletFileUpload.isMultipartContent(request)

��request中是否包含有multipart内容

2、如果有�Q�生成DiskFileItemFactory工厂��进行相关的讄��

         DiskFileItemFactory factory = new DiskFileItemFactory();
        // maximum size that will be stored in memory
        factory.setSizeThreshold(maxMemSize);
        // Location to save data that is larger than maxMemSize.
        factory.setRepository(new File("d:/"));

3、生成上传ServletFileUpload�c�，�q�将DiskFileFactory工厂传给它，�q�对ServletFileUpload�q�行配置

       // Create a new file upload handler
        ServletFileUpload upload = new ServletFileUpload(factory);
        // maximum file size to be uploaded.
        upload.setSizeMax(maxFileSize);

4、从request得到上传的文件列�?/p>

            // Parse the request to get file items.
            List fileItems = upload.parseRequest(request);
            // Process the uploaded file items
            Iterator i = fileItems.iterator();

5、处理文�Ӟ��写入或者其他操�?/p>

while (i.hasNext()) {
                FileItem fi = (FileItem) i.next();
                if (!fi.isFormField()) {
                    // Get the uploaded file parameters
                    String fieldName = fi.getFieldName();
                    String fileName = fi.getName();
                    String contentType = fi.getContentType();
                    boolean isInMemory = fi.isInMemory();
                    long sizeInBytes = fi.getSize();
                    // Write the file
                    if (fileName.lastIndexOf("\\") >= 0) {
                        file = new File(
                                filePath
                                        + fileName.substring(fileName
                                                .lastIndexOf("\\")));
                    } else {
                        file = new File(
                                filePath
                                        + fileName.substring(fileName
                                                .lastIndexOf("\\") + 1));
                    }
                    fi.write(file);
                    out.println("Uploaded Filename: " + fileName + "
");
                }
            }

}

说明�Q?/font>

FileItem接口是对用户上传文�g的封�?/font>

DiskFileItemFactory实现了FileItemFactory接口�Q�主要方法有public FileItem createItem(String fieldName, String contentType, boolean isFormField, String fileName)

ServletFileUpload从FileUpload�l�承�Q�而FileUpload又从FileUploadBase�l�承�Q�功能：分析传入的request对象、得到文件列表FileItemIterator…�?/font>

jack zhai 2011-03-23 13:01 发表评论

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commons-FileUpload上传�q�程