NSURL进行数据请求（POST与GET）

使用Swift进行iOS开发时，不可避免的要进行远程的数据获取和提交。

其数据请求的方式既可能是POST也可能是GET。同不管是POST还是GET又可以分为同步请求和异步请求。

下面通过四个例子来进行演示。

1，使用POST方式提交数据（用户id和分数）

（1）同步请求

 1 //保存分数
 2 func saveScore(score:Int, userid:String)
 3 {
 4     let urlString:String = "http://hangge.com/"
 5     var url:NSURL!
 6     url = NSURL(string:urlString)
 7     var request = NSMutableURLRequest(URL:url)
 8     var body = "score=\(score)&user=\(userid)"
 9     //编码POST数据
10     var postData = body.dataUsingEncoding(NSUTF8StringEncoding)
11     //保用 POST 提交
12     request.HTTPMethod = "POST"
13     request.HTTPBody = postData
14
15     //响应对象
16     var response:NSURLResponse?
17     //错误对象
18     var error:NSError?
19
20     //发出请求
21     var received:NSData? = NSURLConnection.sendSynchronousRequest(request,
22         returningResponse: &response, error: &error)
23
24     if(error != nil){
25         println(error?.code)
26         println(error?.description)
27     }else{
28         var datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)
29         println(datastring)
30     }
31 }

（2）异步请求

 1 import UIKit
 2
 3 class ScoreController:NSObject, NSURLConnectionDataDelegate
 4 {
 5     //保存分数
 6     func saveScore(score:Int, userid:String)
 7     {
 8         let urlString:String = "http://hangge.com/savescore.php"
 9         var url:NSURL!
10         url = NSURL(string:urlString)
11         var request = NSMutableURLRequest(URL:url)
12         var body = "score=\(score)&user=\(userid)"
13         //编码POST数据
14         var postData = body.dataUsingEncoding(NSASCIIStringEncoding)
15         //保用 POST 提交
16         request.HTTPMethod = "POST"
17         request.HTTPBody = postData
18         var conn:NSURLConnection!
19         conn = NSURLConnection(request: request,delegate: self)
20         conn.start()
21         println(conn)
22     }
23
24     func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!)
25     {
26         println("请求成功！");
27         println(response)
28     }
29
30     func connection(connection: NSURLConnection!, didReceiveData data: NSData!)
31     {
32         println("请求成功1！");
33         var datastring = NSString(data:data, encoding: NSUTF8StringEncoding)
34         println(datastring)
35     }
36
37     func connectionDidFinishLoading(connection: NSURLConnection!)
38     {
39         println("请求成功2！");
40     }
41 }

2，使用GET方式获取数据（用户id对应的分数）

（1）同步请求

 1 //获取分数
 2 func getScore(user:String){
 3
 4     let urlString:String="http://hangge.com/getscore.php?user=\(user)"
 5     var url:NSURL!
 6     url = NSURL(string:urlString)
 7     var request = NSMutableURLRequest(URL:url)
 8     request.HTTPMethod = "GET"
 9
10     //响应对象
11     var response:NSURLResponse?
12     //错误对象
13     var error:NSError?
14
15     //发出请求
16     var received:NSData? = NSURLConnection.sendSynchronousRequest(request,
17         returningResponse: &response, error: &error)
18
19     if(error != nil){
20         println(error?.code)
21         println(error?.description)
22     }else{
23         var datastring = NSString(data:received!, encoding: NSUTF8StringEncoding)
24         println(datastring)
25     }
26 }

（2）异步请求

 1 import UIKit
 2
 3 class ScoreController:NSObject, NSURLConnectionDataDelegate
 4 {
 5     //获取分数
 6     func getScore(user:String)
 7     {
 8         let urlString:String="http://hangge.com/getscore.php?user=\(user)"
 9         var url:NSURL!
10         url = NSURL(string:urlString)
11         var request = NSMutableURLRequest(URL:url)
12
13         var body = "user=\(user)"
14         request.HTTPMethod = "GET"
15         var conn:NSURLConnection!
16         conn = NSURLConnection(request: request,delegate: self)
17         conn.start()
18         println(conn)
19     }
20
21     func connection(connection: NSURLConnection!, didReceiveResponse response: NSURLResponse!)
22     {
23         println("请求成功！");
24         println(response)
25     }
26
27     func connection(connection: NSURLConnection!, didReceiveData data: NSData!)
28     {
29         println("请求成功1！");
30         var datastring = NSString(data:data, encoding: NSUTF8StringEncoding)
31         println(datastring)
32         //解析 JSON 数据
33         var json : AnyObject! = NSJSONSerialization.JSONObjectWithData(data,
34             options:NSJSONReadingOptions.AllowFragments,error:nil)
35
36         var score = json.objectForKey("score") as Int
37         println(score)
38     }
39
40     func connectionDidFinishLoading(connection: NSURLConnection!)
41     {
42         println("请求成功2！");
43     }
44 }