iPhone开发之NSURL

通过一个URL，获取URL中包含的各种信息。例如：

 NSURL *url = [NSURL URLWithString:
                  @"http://some-site.com:999/dir1/dir2;param?field-1=value-1&field-2=value-2#anchor1"];
    
    NSLog(@"Scheme: %@", [url scheme]);  //方案
    NSLog(@"Host: %@", [url host]);    //主机
    NSLog(@"Port: %@", [url port]);    //端口  
    NSLog(@"Path: %@", [url path]);    //路径
    NSLog(@"Relative path: %@", [url relativePath]); //相关路径
    NSLog(@"Path components as array: %@", [url pathComponents]);  //路径的每个组成部分     
    NSLog(@"Parameter string: %@", [url parameterString]);   //参数
    NSLog(@"Query: %@", [url query]);                        //查询
    NSLog(@"Fragment: %@", [url fragment]);                  //分段

得到的结果：