FileUpload依赖于commons-io.jar
The simplest case
/
/ Check that we have a file upload request
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
// Create a factory for disk-based file items
FileItemFactory factory = new DiskFileItemFactory();
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("utf-8");
//转码为你需要的格式，后面就不要转码了。后面得到对应的字符串后再转码还是有可能遇到乱码，所以就在这儿转码一半我是转成utf-8，
//好像跟我的页面编码也没关系，因为我的页面是gbk的，是不是和操作系统有关系呢。
// Parse the request
List< FileItem> items = upload.parseRequest(request);
//fileItem的一些操作
fileItem.getInputStream()==========>InputStream
fileItem.get() ==========>byte[]
fileItem.getName()
fileItem.getFieldName()
for(FileItem item:items){
byte[] b=item.get();
FileOutputStream out=new FileOutputStream("d:/"+item.getName());
out.write(b);
out.close();
}
HTML端的书写
<form action="run" enctype="multipart/form-data" method="post">
<input type="file" name="a"/>
<input type="file" name="b"/>
<input type="submit" value="提交"/>
</form>
注意
要上传的file必须要有name=“a”即使你不需要，也得有，要不然解析不出来的。
