我正在尝试从模拟器上的ios应用程序向我在本地服务器上运行的REST服务发送http请求。我在这里关注了一些关于如何设置简单请求的帖子，但它似乎并没有像REST服务器那样。我是新手，所以我并不是我出错的地方。
更新：原来这实际上是在联系服务器。问题似乎与请求的MIME类型有关。
更新2：我将NSURLRequest更改为NSMutableURLRequest，以便我可以包含此行[request setValue:@"text/html" forHTTPHeaderField: @"Content-Type"];
将内容类型更改为html。现在，当我尝试发送请求时，我收到错误。
我在输出日志中收到了这个
:2014-03-26 23:48:07.510 REST[1516:70b] -[NSURLRequest setValue:forHTTPHeaderField:]: unrecognized selector sent to instance 0x8a1abe0
2014-03-26 23:48:07.713 REST[1516:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSURLRequest setValue:forHTTPHeaderField:]: unrecognized selector sent to instance 0x8a1abe0'
*** First throw call stack:
(
0 CoreFoundation 0x0173a5e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x014bd8b6 objc_exception_throw + 44
2 CoreFoundation 0x017d7903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x0172a90b ___forwarding___ + 1019
4 CoreFoundation 0x0172a4ee _CF_forwarding_prep_0 + 14
5 REST 0x00001ead -[ViewController fetchTweet] + 237
6 REST 0x0000223e -[ViewController go:] + 78
7 libobjc.A.dylib 0x014cf874 -[NSObject performSelector:withObject:withObject:] + 77
8 UIKit 0x0022d0c2 -[UIApplication sendAction:to:from:forEvent:] + 108
9 UIKit 0x0022d04e -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
10 UIKit 0x003250c1 -[UIControl sendAction:to:forEvent:] + 66
11 UIKit 0x00325484 -[UIControl _sendActionsForEvents:withEvent:] + 577
12 UIKit 0x00324733 -[UIControl touchesEnded:withEvent:] + 641
13 UIKit 0x0026a51d -[UIWindow _sendTouchesForEvent:] + 852
14 UIKit 0x0026b184 -[UIWindow sendEvent:] + 1232
15 UIKit 0x0023ee86 -[UIApplication sendEvent:] + 242
16 UIKit 0x0022918f _UIApplicationHandleEventQueue + 11421
17 CoreFoundation 0x016c383f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
18 CoreFoundation 0x016c31cb __CFRunLoopDoSources0 + 235
19 CoreFoundation 0x016e029e __CFRunLoopRun + 910
20 CoreFoundation 0x016dfac3 CFRunLoopRunSpecific + 467
21 CoreFoundation 0x016df8db CFRunLoopRunInMode + 123
22 GraphicsServices 0x036df9e2 GSEventRunModal + 192
23 GraphicsServices 0x036df809 GSEventRun + 104
24 UIKit 0x0022bd3b UIApplicationMain + 1225
25 REST 0x00002a2d main + 141
26 libdyld.dylib 0x01d78701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
这是ViewController.h文件：
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface ViewController : UIViewController<NSURLConnectionDelegate>
@property (nonatomic, readwrite, weak) IBOutlet UIButton *button;
@property (nonatomic, readwrite, weak) IBOutlet UILabel *label;
@property (nonatomic, strong) IBOutlet UILabel *tweetId;
@property (nonatomic, strong) IBOutlet UILabel *tweetContent;
@property (nonatomic) NSURLConnection *connection;
- (IBAction)go:(id)sender;
- (IBAction)fetchTweet;
@end
这是ViewController.m文件：
#import "ViewController.h"
@implementation ViewController
@synthesize button=_button;
@synthesize label=_label;
@synthesize tweetId=_tweetId;
@synthesize tweetContent=_tweetContent;
@synthesize connection=_connection;
- (IBAction)fetchTweet
{
NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:8080/Jersey/rest/hello"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"Did Receive Response %@", response);
}
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
//NSLog(@"Did Receive Data %@", data);
}
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
NSLog(@"Did Fail");
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Did Finish");
// Do something with responseData
}
- (IBAction)go:(id)sender
{
[self fetchTweet];
self.label.text = @"Working";
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
答案 0 :(得分：0)
问题在于您只是忽略了进来的数据，从我看到您的服务器到达的评论中，如果您将实现更新为类似的内容，它应该可以正常工作
#import "ViewController.h"
@implementation ViewController
{
NSMutableData *_currentData;
}
@synthesize button=_button;
@synthesize label=_label;
@synthesize tweetId=_tweetId;
@synthesize tweetContent=_tweetContent;
@synthesize connection=_connection;
- (IBAction)fetchTweet
{
NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:8080/Jersey/rest/hello"];
self->_currentData = [[NSMutableData alloc] init];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLConnection alloc] initWithRequest:request delegate:self];
}
- (void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"Did Receive Response %@", response);
}
- (void)connection:(NSURLConnection*)connection didReceiveData:(NSData*)data
{
//NSLog(@"Did Receive Data %@", data);
[self->_currentData appendData:data];
}
- (void)connection:(NSURLConnection*)connection didFailWithError:(NSError*)error
{
NSLog(@"Did Fail");
self->_currentdata = Nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"Did Finish");
// Do something with responseData
NSString *dataString = [[NSString alloc] initWithdata:self->_currentData encoding:NSASCIIStringEncoding]
NSLog(@"Received data: %@", dataString);
}
- (IBAction)go:(id)sender
{
[self fetchTweet];
self.label.text = @"Working";
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end