最近遇到java获取DLL文件版本的问题，本来想通过JNI直接调用C++获取版本号，但是程序运行环境部是在windows下面，会导致迁移到LINUX下也无法运行，后来在网上找了很久也没发现问题解决方案，索性就自己研究了下DLL文件内部，代码如下：

import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.InputStreamReader;public class T {    public static void main(String[] args) throws Exception{        String filePath = "C:\\WINDOWS\\twain_32.dll";        File file = new File(filePath);        BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));        String s = "F i l e V e r s i o n";        byte[] b = s.getBytes();        for (int i = 0; i < b.length; i++) {            if(b[i] == 32){                b[i] = 0;            }        }        String str = new String(b);                  byte[] data = null;                  while(reader.ready()){            String line = reader.readLine();            int index = line.indexOf(str);            if(index > 0){                int len = index + str.length() + 5;                String sb = line.substring(len,len+16);                data = sb.getBytes();                break;            }        }                  int version1 = getVersion(data, 0, 1);        int version2 = getVersion(data, 3, 5);        int version3 = getVersion(data, 7, 9);        int version4 = getVersion(data, 11, 15);                            String version = version1 + "." + version2 + "." + version3 + "." + version4;                  System.out.println(version);        System.out.println(new String(data));    }          public static int getVersion(byte[] data,int start,int end){        int version = 0;        int len = end-start;        byte[] d = new byte[len];        for (int i = start,j=0; i < end; i++,j++) {            d[j] = data[i];        }        version = Integer.parseInt(new String(d).trim());        return version;    }}