写一个函数，算出两个文件的相对路径的

public static void main(String[] args) throws Exception {

String pathA = "/a/b/c/d/g/m/1.txt";
String pathB = "/c/b/c/d/g/h/2.txt";
System.out.println(pathARelativePathBRecursion(pathA,pathB,""));
}

/**
* pathA相对于pathB的相对路径 递归算法:
*
* @param pathA
* @param pathB
* @param i
* @return
*/
public static String pathARelativePathBRecursion(String pathA,String pathB, String tempPath) {
if (pathA.startsWith(pathB))
return pathA.replaceFirst(pathB+"/",tempPath.substring(0,tempPath.length()-3));
else
return pathARelativePathBRecursion(pathA, pathB.substring(0, pathB.lastIndexOf("/")), "../" + tempPath);
}