IOS学习之路十八（通过 NSURLConnection 发送 HTTP 各种请求）

你想通过 Http 协议向服务器发送一个 Get 的包装请求,并在这个请求中添加了一些请

求参数.

向远程服务器发送一个 GET 请求,然后解析返回的数据。通常一个 GET 请求是添加了

一些参数的,这些参数一般是添加在 URL 请求中。
我准备了一个 GET 形式的 webservice 接口,你可以通过 http://pixolity.com/get.php 来进

行请求。

/* URL = http://pixolity.com/get.php?param1=First¶m2=Second */ NSString *urlAsString = @"http://pixolity.com/get.php";
urlAsString = [urlAsString stringByAppendingString:@"?param1=First"]; urlAsString = [urlAsString stringByAppendingString:@"¶m2=Second"];
NSURL *url = [NSURL URLWithString:urlAsString];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url]; [urlRequest setTimeoutInterval:30.0f];
[urlRequest setHTTPMethod:@"GET"];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response,

NSData *data, NSError *error) {
if ([data length] >0 && error == nil){
NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"HTML = %@", html); }
else if ([data length] == 0 && error == nil){
NSLog(@"Nothing was downloaded."); }
else if (error != nil){
NSLog(@"Error happened = %@", error);
} }];

post请求：

NSString *urlAsString = @"http://pixolity.com/post.php";
urlAsString = [urlAsString stringByAppendingString:@"?param1=First"];
urlAsString = [urlAsString stringByAppendingString:@"¶m2=Second"];
NSURL *url = [NSURL URLWithString:urlAsString];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url]; [urlRequest setTimeoutInterval:30.0f];
[urlRequest setHTTPMethod:@"POST"];
NSString *body = @"bodyParam1=BodyValue1&bodyParam2=BodyValue2"; [urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]]; NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response,
NSData *data, NSError *error) {
if ([data length] >0 && error == nil){
NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"HTML = %@", html); }
else if ([data length] == 0 && error == nil){
NSLog(@"Nothing was downloaded."); }
else if (error != nil){
NSLog(@"Error happened = %@", error);
} }];

delete请求：

NSString *urlAsString = @"http://pixolity.com/delete.php";
urlAsString = [urlAsString stringByAppendingString:@"?param1=First"];
urlAsString = [urlAsString stringByAppendingString:@"¶m2=Second"];
NSURL *url = [NSURL URLWithString:urlAsString];
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];
[urlRequest setTimeoutInterval:30.0f];
[urlRequest setHTTPMethod:@"DELETE"];
NSString *body = @"bodyParam1=BodyValue1&bodyParam2=BodyValue2";
[urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:
 ^(NSURLResponse *response, NSData *data, NSError *error) {
     if ([data length] >0 && error == nil){
         NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
         NSLog(@"HTML = %@", html); }
     else if ([data length] == 0 && error == nil){
         NSLog(@"Nothing was downloaded."); }
     else if (error != nil){
         NSLog(@"Error happened = %@", error);
     } }];

put请求：

NSString *urlAsString=@"http://pixolity.com/put.php";
   urlAsString=[urlAsString stringByAppendingString:@"?param1=First"];
   urlAsString=[urlAsString stringByAppendingString:@"¶m2=Second"];
   NSURL *url=[NSURL URLWithString:urlAsString];
   NSMutableURLRequest *urlRequest=[NSMutableURLRequest requestWithURL:url];
   [urlRequest setTimeoutInterval:30.0f];
   [urlRequest setHTTPMethod:@"PUT"];
   NSString *body=@"bodyParaml=BodyValuel&bodyParam2=BodyValue2";
   [urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];
   NSOperationQueue *queue=[[NSOperationQueue alloc] init];
   [NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
       if ([data length]>0&&error==nil) {
           NSString *html=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
           NSLog(@"HTML=%@",html);
       }else if([data length]==0&&error==nil){
           NSLog(@"Nothing was downLoaded.");
       }else if(error!=nil){
           NSLog(@"Error Happened=%@",error);
       }
   }];

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