How to obtain detailed information and attributes of files (such as exe files) in windows and linux

Programmers are very lazy, you know!

Recently, during project development, the exe program developed by cs needs to be automatically upgraded. The exe program is placed in linux and cannot be detected during automatic upgrade, however, the exe program on our client needs to obtain the version number of the new program on the server. Finally, I use java to implement the linux exe file version number reading function. The detailed code is as follows:

Package com. herman. utils; import java. io. file; import java. io. fileNotFoundException; import java. io. IOException; import java. io. randomAccessFile;/*** @ see tool class for obtaining file information * @ author Herman. xiong * @ date May 12, 2014 15:01:26 * @ version V1.0 * @ since tomcat 6.0, jdk 1.6 */public class FileUtil {/*** @ see get version information * @ param filePath * @ return */public static String getVersion (String filePath) {File file File = new Fi Le (filePath); RandomAccessFile raf = null; byte [] buffer; String str; try {raf = new RandomAccessFile (file, "r"); buffer = new byte [64]; raf. read (buffer); str = "" + (char) buffer [0] + (char) buffer [1]; if (! "MZ ". equals (str) {return null;} int peOffset = unpack (new byte [] {buffer [60], buffer [61], buffer [62], buffer [63]}); if (peOffset <64) {return null;} raf. seek (peOffset); buffer = new byte [24]; raf. read (buffer); str = "" + (char) buffer [0] + (char) buffer [1]; if (! "PE". equals (str) {return null;} int machine = unpack (new byte [] {buffer [4], buffer [5]}); if (machine! = 332) {return null;} int noSections = unpack (new byte [] {buffer [6], buffer [7]}); int optHdrSize = unpack (new byte [] {buffer [20], buffer [21]}); raf. seek (raf. getFilePointer () + optHdrSize); boolean resFound = false; for (int I = 0; I <noSections; I ++) {buffer = new byte [40]; raf. read (buffer); str = "" + (char) buffer [0] + (char) buffer [1] + (char) buffer [2] + (char) buffer [3] + (char) buffer [4]; if (". rs Rc ". equals (str) {resFound = true; break ;}} if (! ResFound) {return null;} int infoVirt = unpack (new byte [] {buffer [12], buffer [13], buffer [14], buffer [15]}); int infoSize = unpack (new byte [] {buffer [16], buffer [17], buffer [18], buffer [19]}); int infoOff = unpack (new byte [] {buffer [20], buffer [21], buffer [22], buffer [23]}); raf. seek (infoOff); buffer = new byte [infoSize]; raf. read (buffer); int numDirs = unpack (new byte [] {buffer [14], buffer [15]}); boo Lean infoFound = false; int subOff = 0; for (int I = 0; I <numDirs; I ++) {int type = unpack (new byte [] {buffer [I * 8 + 16], buffer [I * 8 + 17], buffer [I * 8 + 18], buffer [I * 8 + 19]}); if (type = 16) {// FILEINFO resourceinfoFound = true; subOff = unpack (new byte [] {buffer [I * 8 + 20], buffer [I * 8 + 21], buffer [I * 8 + 22], buffer [I * 8 + 23]}); break ;}} if (! InfoFound) {return null;} subOff = subOff & 0x7fffffff; infoOff = unpack (new byte [] {buffer [subOff + 20], buffer [subOff + 21], buffer [subOff + 22], buffer [subOff + 23]}); // offset of first FILEINFOinfoOff = infoOff & 0x7fffffff; infoOff = unpack (new byte [] {buffer [infoOff + 20], buffer [infoOff + 21], buffer [infoOff + 22], buffer [infoOff + 23]}); // offset to dataint dataOff = unpack (new byte [] {buff Er [infoOff], buffer [infoOff + 1], buffer [infoOff + 2], buffer [infoOff + 3]}); dataOff = dataOff-infoVirt; int version1 = unpack (new byte [] {buffer [dataOff + 48], buffer [dataOff + 48 + 1]}); int version2 = unpack (new byte [] {buffer [dataOff + 48 + 2], buffer [dataOff + 48 + 3]}); int version3 = unpack (new byte [] {buffer [dataOff + 48 + 4], buffer [dataOff + 48 + 5]}); int version4 = unpack (new byte [] {Buffer [dataOff + 48 + 6], buffer [dataOff + 48 + 7]}); System. out. println (version2 + ". "+ version1 + ". "+ version4 + ". "+ version3); return version2 + ". "+ version1 + ". "+ version4 + ". "+ version3;} catch (FileNotFoundException e) {return null;} catch (IOException e) {return null;} finally {if (raf! = Null) {try {raf. close () ;}catch (IOException e) {}}} public static int unpack (byte [] B) {int num = 0; for (int I = 0; I <B. length; I ++) {num = 256 * num + (B [B. length-1-I] & 0xff);} return num ;}}

Run (correct filePath on Windows and linux ):

Click to download a detailed Demo project:Http://download.csdn.net/detail/xmt1139057136/7335155