java.io.IOException: This archive has already been finished
at org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream.finish(ZipArchiveOutputStream.java:406)
at com.xunge.AESFileEncoder.unzip(AESFileEncoder.java:212)
at com.xunge.AESFileEncoder.unzip(AESFileEncoder.java:80)
at com.xunge.AESFileEncoder.main(AESFileEncoder.java:370)

出现这个问题是因为之前已经调用过.finish()方法了，后来又调用，就会产生这个异常。