src/org/nutz/lang/Files.java
public static boolean copy(File src, File target) {
        try {
            if (src.isDirectory())
                return copyDir(src, target);
            return copyFile(src, target);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    }
public static boolean copy(File src, File target) {
        try {
            if (src.isDirectory())
                return copyDir(src, target);
            return copyFile(src, target);
        }
        catch (IOException e) {
            throw Lang.wrapThrow(e);
        }
    }
自动决定是 copy 文件还是目录

@param src
源
@param target
目标
@return 是否 copy 成功