Java write file file name 0 0 truncation BUG that caused file upload vulnerability and fix-vulnerability warning-the black bar safety net

Java in the above two environments to write the files, because 0 0 is truncated and not correct for the new generated file name. For example, the user needs to username abc. jsp . jpg, but after 0 0 after truncation, the resulting file name becomes the abc. jsp , therefore we are in relation to t...