- 1.同步請求发钝，一旦發(fā)送請求菇篡，程序禁止用戶交互漩符，直到服務(wù)器返回數(shù)據(jù)完成，才能進行下一步操作
- 2.異步請求不會阻塞主線程驱还，而回建立一個新的線程來操作嗜暴，用戶發(fā)出請求以后，可以繼續(xù)對UI操作议蟆，程序可以繼續(xù)運行
- 3.GET請求闷沥，將參數(shù)直接寫在訪問路徑上。操作簡單咐容，但是容易被外界看到舆逃，安全性不高。
- 4.POST請求戳粒，將參數(shù)放到body里面路狮，POST操作相對復(fù)雜，需要將參數(shù)和地址分開蔚约，相對更加安全.
GET請求
NSString *urlString = KgetUrl;
NSURL *url = [NSURL URLWithString:urlString];
//創(chuàng)建請求體
NSURLRequest *request = [NSURLRequest requestWithURL:url];
//創(chuàng)建一個session對象
NSURLSession *session = [NSURLSession sharedSession];
//創(chuàng)建請求任務(wù)
NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSString *result = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"GTE:%@",result);
}];
//注意不能忘了這一步
[task resume];
POST請求
NSString *urlString = KpostUrl;
NSURL *url = [NSURL URLWithString:urlString];
//創(chuàng)建請求體奄妨，注意是 NSMutableURLRequest
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
//設(shè)置為POST請求
[request setHTTPMethod:@"POST"];
NSString *postString = KparameterUrl;
NSData *data = [postString dataUsingEncoding:NSUTF8StringEncoding];
//添加參數(shù)
[request setHTTPBody:data];
//創(chuàng)建session對象
NSURLSession *session = [NSURLSession sharedSession];
//創(chuàng)建一個請求任務(wù)
NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSString *result = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"POST%@",result);
}];
[task resume];
代理
- (IBAction)delegateAction:(UIButton *)sender {
//遵循代理 <NSURLSessionDataDelegate>
//
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//新建任務(wù)
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:KgetUrl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
//創(chuàng)建請求
NSURLSessionDataTask *task = [session dataTaskWithRequest:request];
[task resume];
}
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler{
//當網(wǎng)絡(luò)基于HTTP協(xié)議時,response是NSHTTPURLResponse類型的
// NSHTTPURLResponse *URLResponse = (NSHTTPURLResponse *)response;
// long long length = URLResponse.expectedContentLength;
// NSLog(@"%ld",URLResponse.statusCode);
// NSLog(@"%lld",length);
//允許服務(wù)器回傳數(shù)據(jù)
completionHandler(NSURLSessionResponseAllow);
}
//接受服務(wù)器傳回來的數(shù)據(jù)，可能執(zhí)行多次
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data{
NSString *string=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
if (string) {
[self.astring appendString:string];
}
NSLog(@"%@",self.astring);
}
//接受或者失敗時調(diào)用
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error{
NSLog(@"%@******",error);
}
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