in java/src/main/java/com/aliyun/fileform/FileFormInputStream.java [26:35]
public FileFormInputStream(Map<String, Object> form, String boundary) {
this.boundary = boundary;
this.form = form;
keys = form.keySet().toArray(new String[]{});
try {
this.endInputStream = new ByteArrayInputStream(("--" + boundary + "--\r\n").getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}