/** *  保存TOKEN * *  @param token <#token description#> */+(void)savaToken:(BZToken *) token{    //2.沙河路径    NSLog(@"沙盒Path：%@",NSHomeDirectory());        //3.写入信息    //3.1 获取应用程序沙盒的Documents目录    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);    NSString *path=[paths objectAtIndex:0];        //3.2 得到完整的文件名    NSString *filename=[path stringByAppendingPathComponent:TOKEN_PLIST];        //3.3 需要保存的数据 value token.access_token  key access_token    NSDictionary* dic = [NSDictionary dictionaryWithObjectsAndKeys:token.access_token,@"access_token",nil];        //3.4 写入数据    [dic writeToFile:filename atomically:YES];        }/** *  读取Token */+(NSString *)readToken{    //1 获取应用程序沙盒的Documents目录    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);    NSString *path=[paths objectAtIndex:0];        //2 完成路径    NSString *filename=[path stringByAppendingPathComponent:TOKEN_PLIST];   //获取路径    NSDictionary* dic = [NSDictionary dictionaryWithContentsOfFile:filename];        //3 返回数据    return [dic objectForKey:@"access_token"];}