java 获取zip里附加注释
jdk里面提供了往zip包里添加注释的api方法ZipOutputStream里的setComment,但似乎找不到如何获取zip包里的附加注释的方法,在google里搜了一下,在一个英文网站里发现这个方法,测试可用.

public static String extractZipComment (String filename) {String retStr = null;try {File file = new File(filename);int fileLen = (int)file.length(); FileInputStream in = new FileInputStream(file); /* The whole ZIP comment (including the magic byte sequence)* MUST fit in the buffer* otherwise, the comment will not be recognized correctly** You can safely increase the buffer size if you like*/byte[] buffer = new byte[Math.min(fileLen, 8192)];int len; in.skip(fileLen - buffer.length); if ((len = in.read(buffer)) > 0) {retStr = getZipCommentFromBuffer (buffer, len);} in.close();} catch (Exception e) {e.printStackTrace();}return retStr;} private static String getZipCommentFromBuffer (byte[] buffer, int len) {byte[] magicDirEnd = {0x50, 0x4b, 0x05, 0x06};int buffLen = Math.min(buffer.length, len);//Check the buffer from the endfor (int i = buffLen-magicDirEnd.length-22; i >= 0; i--) {boolean isMagicStart = true;for (int k=0; k < magicDirEnd.length; k++) {if (buffer[i+k] != magicDirEnd[k]) {isMagicStart = false;break;}}if (isMagicStart) {//Magic Start found!int commentLen = buffer[i+20] + buffer[i+22]*256;int realLen = buffLen - i - 22;System.out.println ("ZIP comment found at buffer position " + (i+22) + " with len="+commentLen+", good!");if (commentLen != realLen) {System.out.println ("WARNING! ZIP comment size mismatch: directory says len is "+commentLen+", but file ends after " + realLen + " bytes!");}String comment = new String (buffer, i+22, Math.min(commentLen, realLen));return comment;}}System.out.println ("ERROR! ZIP comment NOT found!");return null;}