1.發(fā)送同步請求(返回NSData數(shù)據(jù))
[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:nil];在當(dāng)前線程執(zhí)行，返回NSData數(shù)據(jù)
2.發(fā)送異步請求(利用block)
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSLog(@"返回數(shù)據(jù):%@",data); }];在異步線程執(zhí)行,請求成功后,在block回調(diào)函數(shù)里拿到返回的數(shù)據(jù)體
3.發(fā)送異步請求(利用代理)
NSURLConnection *connection = [NSURLConnection alloc] init];connection.delegate = self;在異步線程執(zhí)行,請求成功后,調(diào)用代理的相關(guān)方法拿到相應(yīng)的數(shù)據(jù),這種方法適合大文件分段下載。
/**1.接收到服務(wù)器的響應(yīng) */- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{}/**2.接收到服務(wù)器的數(shù)據(jù)*/- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{}/**3.服務(wù)器的數(shù)據(jù)接收完畢*/- (void)connectionDidFinishLoading:(NSURLConnection *)connection{}/**4.請求錯誤*/- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{}一、GET請求
1.如果有參數(shù),直接拼接在URL后面,用？隔開,且每個參數(shù)用&分開.
利用NSURLConnection不需要包含請求行和請求頭,底層以及包裝好，且默認(rèn)就是get請求.我們只需加載指定URL資源,創(chuàng)建請求，發(fā)送請求即可。
示例程序:訪問服務(wù)器登錄界面
//1.資源字符串 NSString *urlStr = @"http://127.0.0.1/login.php?name=張三&passWord=1234"; //如果字符串里面含有中文要進(jìn)行轉(zhuǎn)碼 urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //2.創(chuàng)建資源路徑 NSURL *url = [NSURL URLWithString:urlStr]; //3.創(chuàng)建請求 NSURLRequest *request = [NSURLRequest requestWithURL:url]; //4.發(fā)送請求 [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSLog(@"%@",data); }];二、post請求
利用NSURLConnection,由于默認(rèn)是GET請求,所以要申明請求方法為POST,且需要封裝
//1.資源字符串 NSString *urlStr = @"http://127.0.0.1/login.php"; //如果字符串里面含有中文要進(jìn)行轉(zhuǎn)碼 //urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //2.設(shè)置請求路徑 NSURL *url = [NSURL URLWithString:urlStr]; //3.創(chuàng)建請求 NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; // 默認(rèn)就是GET請求 request.timeoutInterval = 5; // 設(shè)置請求超時 request.HTTPMethod = @"POST"; // 設(shè)置為POST請求 //4.設(shè)置請求體 NSString *param = [NSString stringWithFormat:@"name=%@&password=%@",name, password];//name和password一般從輸入框取得 request.HTTPBody = [param dataUsingEncoding:NSUTF8StringEncoding]; //5.發(fā)送請求 NSOperationQueue *queue = [NSOperationQueue mainQueue]; [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { // 當(dāng)請求結(jié)束的時候調(diào)用 NSLog(@"返回數(shù)據(jù)-%@",data); }];三、head請求
其實(shí)head請求和get請求差不多，只不過是服務(wù)器只返回響應(yīng)頭，不返回具體數(shù)據(jù)，這可以幫助我們后面講解下載文件時如何獲得文件大小
NSURL *url = [NSURL URLWithString:@"http://127.0.0.1/images/xhr.png"]; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; request.HTTPMethod = @"HEAD"; NSURLResponse *response = nil; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSLog(@"文件長度-%lld",response.expectedContentLength; }];相比較而言,post請求比get請求安全，get請求所有數(shù)據(jù)暴露在URL中,post數(shù)據(jù)封裝在請求體中, 不過通過Firefox也能查看到post的請求體,對于網(wǎng)頁服務(wù)器開發(fā),firefox是個利器,強(qiáng)烈推薦。
對于數(shù)據(jù)安全這塊不用擔(dān)心，后面會講解如何對數(shù)據(jù)進(jìn)行加密處理.
原文：http://www.cnblogs.com/wc85328/p/4250918.html
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