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如何在windows下和linux下獲取文件(如exe文件)的詳細信息和屬性
程序員都很懶，你懂的！
最近在項目開發中,由cs開發的exe的程序，需要自動升級，該exe程序放在linux下，自動升級時檢測不到該exe程序的版本號信息，但是我們客戶端的exe程序需要獲取服務器上新程序的版本號信息。最後由我用java實現linux上exe文件的版本號讀取功能。下麵是詳細代碼：
package com.herman.utils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
/**
* @see 獲取文件信息的工具類
* @author Herman.Xiong
* @date 2014年5月12日 15:01:26
* @version V1.0
* @since tomcat 6.0 , jdk 1.6
*/
public class FileUtil {
/**
* @see 獲取版本信息
* @param filePath
* @return
*/
public static String getVersion(String filePath) {
File file = new File(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 (".rsrc".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] });
boolean 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 resource
infoFound = 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 FILEINFO
infoOff = infoOff & 0x7fffffff;
infoOff = unpack(new byte[] { buffer[infoOff + 20],
buffer[infoOff + 21], buffer[infoOff + 22],
buffer[infoOff + 23] }); // offset to data
int dataOff = unpack(new byte[] { buffer[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;
}
}
運行效果圖(window上和linux的filePath自己改正正確即可)：
點擊下載詳細的演示項目：https://download.csdn.net/detail/xmt1139057136/7335155
最後更新：2017-04-03 12:56:38