// 取得提交form的request
WebRequest request = form.getRequest();
request.setParameter("myparam", "中华人民共和国");
request.selectFile("myfile", new File(srcdir, "smallfile.txt"));
File nonAsciiFile = 中文文件名;
if (nonAsciiFile.exists()) {
request.selectFile("myfile_中文", nonAsciiFile);