如何获得运行在跨平台的信息和属性的情况下，文件

很多情况下，我们需要得到该系统的版本号可以运行该文件数。为了做一些额外的动作！实际上可使用jna获得，是这将依赖人家，所以还是Java自己来吧！好啦。直接上代码吧

/**
 * @Description: 
 *
 * @Title: FileInfoUtil.java
 * @Package com.joyce.util
 * @Copyright: Copyright (c) 2014
 *
 * @author Comsys-LZP
 * @date 2014-5-12 下午03:46:32
 * @version V2.0
 */
package com.joyce.util;

import java.io.File;
import java.io.RandomAccessFile;

/**
 * @Description:文件操作工具类
 * 
 * @ClassName: FileInfoUtil
 * @Copyright: Copyright (c) 2014
 * 
 * @author Comsys-LZP
 * @date 2014-5-12 下午03:46:32
 * @version V2.0
 */
public class FileInfoUtil {
	
	/**
	 * @Description: 获取文件版本号信息 
	 *
	 * @param file
	 * @return
	 *
	 * @Title: FileInfoUtil.java
	 * @Copyright: Copyright (c) 2014
	 *
	 * @author Comsys-LZP
	 * @date 2014-5-12 下午04:36:17
	 * @version V2.0
	 */
	public static String getVersion(File file) {
		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 nameEntries = unpack(new byte[] { buffer[12], buffer[13] });
			int idEntries = unpack(new byte[] { buffer[14], buffer[15] });
			boolean infoFound = false;
			int subOff = 0;
			for (int i = 0; i < (nameEntries + idEntries); 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] });
			return version2 + "." + version1 + "." + version4 + "." + version3;
		} catch (Exception e) {
			return null;
		} finally {
			if (raf != null) {
				try {
					raf.close();
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	}

	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;
	}

	public static void main(String[] args) {
		try {
//			String filePath = "D:\Program Files (x86)\Wiz\Wiz.exe";
			String filePath = "D:\Program Files (x86)\360\360Chrome\Chrome\Application\360chrome.exe";
			File file = new File(filePath);
			System.out.println("软件版本号号：" + getVersion(file));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

真的非常赞。效果美极了！

附上完整文件资源下载地址：http://download.csdn.net/download/luo201227/7336013

版权声明：本文博客原创文章。博客，未经同意，不得转载。