1
2 - (void)viewDidLoad
3 {
4 [super viewDidLoad];
5 // Do any additional setup after loading the view.
6
7 /*2013/8/19
8 同步/异步下载数据
9 */
10
11
12 }
13 //从服务器取得数据-同步下载方式
14 - (void)loadDataFromServer:(NSInteger)page andCount:(NSInteger)number
15 {
16 //创建服务器地址
17 NSString * strSever = [NSString stringWithFormat:@"http://192.168.88.8/sns/my/user_list.php?page=%d&number=%d",page, number];
18 //根据服务器地址创建一个url对象,通过此对象进行服务器的数据交互
19 NSURL * url = [NSURL URLWithString:strSever];
20 //访问服务器数据,get方式获取数据,同步下载方式,对主线程造成阻塞
21 NSString * strContent = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
22 //将字符串转化为数据流
23 NSData * data = [strContent dataUsingEncoding:NSUTF8StringEncoding];
24 //json数据解析结果返回
25 NSDictionary * dic = [data JSONValue];
26 }
27 //NSURLConnectionDataDelegate 服务器连接数据协议
28 - (void)loadDataFromServer1:(NSInteger)page andCount:(NSInteger)number
29 {
30 //创建服务器地址
31 NSString * strSever = [NSString stringWithFormat:@"http://192.168.88.8/sns/my/user_list.php?page=%d&number=%d",page,number];
32 //创建URL
33 NSURL * url = [NSURL URLWithString:strSever];
34 //创建一个url连接请求
35 NSURLRequest * request = [NSURLRequest requestWithURL:url];
36 //创建连接对服务器,并启动连接,自动创建连接过程
37 mConnection = [NSURLConnection connectionWithRequest:request delegate:self];
38 //初始化数据流
39 mData = [[NSMutableData alloc]initWithCapacity:0];
40 }
41 //服务器应答后调用,返回respose,服务器状态
42 - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
43 {
44 //将应带转行为http应答格式
45 NSHTTPURLResponse * httpRes = (NSHTTPURLResponse *)response;
46
47 switch ([httpRes statusCode])
48 {
49 case 200:
50 NSLog(@"连接成功");
51 break;
52 case 440:
53 NSLog(@"资源不存在");
54 break;
55 case 500:
56 NSLog(@"服务器宕机");
57 break;
58 default:
59 break;
60 }
61
62 //数据清空
63 [mData setLength:0];
64 }
65 //接收数据调用
66 - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
67 {
68 //将接收的数据添加到mData尾部
69 [mData appendData:data];
70 }
71 //当数据下载结束之后调用
72 - (void)connectionDidFinishLoading:(NSURLConnection *)connection
73 {
74 NSDictionary * dic = [mData JSONValue];
75 }
