Commons FileUpload文件上传组件

Java实现的文件上传组件有好几种,其中最为“官方”的要数Apache Commons库中的FileUpload了吧。

页面

<form method="POST" enctype="multipart/form-data" action="fup.cgi">
File to upload: <input type="file" name="upfile"><br/>
Notes about the file: <input type="text" name="note"><br/>
<br/>
<input type="submit" value="Press"> to upload the file!
</form>

后台java,可在servlet或者struts的action中处理

// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Configure a repository (to ensure a secure temp location is used)
ServletContext servletContext = this.getServlet().getServletContext();
File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
factory.setRepository(repository);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// Parse the request
try {
List<FileItem> items = upload.parseRequest(request); // Process the uploaded items
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem item = iter.next();
if (item.isFormField()) {
//processFormField(item);
} else {
//processUploadedFile(item);
String fieldName = item.getFieldName();
String fileName = item.getName();
String contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
File uploadedFile = new File("temp.xls");
item.write(uploadedFile);
}}
以上代码作用是将一个文件(这里是一个excel)从客户端的浏览器通过form表单上传到服务器,服务器端的FileUpload将它保存到temp.xls中。
参考: http://commons.apache.org/proper/commons-fileupload/

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