NSOperationQueue *queue = [[NSOperationQueue alloc] init];// 异步方法[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {        NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];        NSLog(@"%@", str);}];

// 使用AFNetworking 2.0框架的网络请求
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];manager.requestSerializer.timeoutInterval = 30;manager.responseSerializer = [AFJSONResponseSerializer serializer];manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"]; // 很多后台格式问题用此行解决，不一定必须// httpBody//    NSDictionary *httpBodyParameters = @{@"http": @"body"};

// kJsonSourceURLAddress请求地址[manager GET:kJsonSourceURLAddress_1 parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {//        NSDictionary *jsonDict = (NSDictionary *)responseObject;//        [self displayWithParsedDic:jsonDict];        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误" message:[NSString stringWithFormat:@"%@", error] delegate:nil cancelButtonTitle:@"关闭" otherButtonTitles:nil, nil];        [alert show];}];

NSURL *url = [NSURL URLWithString:kJsonSourceURLAddress_1];NSURLRequest *urlRequest = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:30];//    NSMutableURLRequest *test = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:kJsonSourceURLAddress_1 parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {//        // TODO 文件上传////        [formData appendPartWithFileData:<#(NSData *)#> name:<#(NSString *)#> fileName:<#(NSString *)#> mimeType:<#(NSString *)#>]//    }];//    // 网络GET请求//    NSMutableURLRequest *requestGet = [NSMutableURLRequest requestWithURL:url];//    requestGet.HTTPMethod = @"GET";//    requestGet.timeoutInterval = 30;////    // 网络POST请求//    NSMutableURLRequest *requestPost = [NSMutableURLRequest requestWithURL:url];//    requestPost.HTTPMethod = @"POST";//    requestPost.timeoutInterval = 30;//    NSData *httpBody = [kJsonSourceURLAddress_1 dataUsingEncoding:NSUTF8StringEncoding];//    NSLog(@"%@", httpBody);//    requestPost.HTTPBody = httpBody;AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]                                         initWithRequest:urlRequest];operation.responseSerializer = [AFJSONResponseSerializer serializer];// 很多后台格式问题用此行解决，不一定必须operation.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"];[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {//        NSLog(@"%@", responseObject);        NSDictionary *jsonDict = (NSDictionary *)responseObject;        [self displayWithParsedDic:jsonDict];        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"错误" message:[NSString stringWithFormat:@"%@", error] delegate:nil cancelButtonTitle:@"关闭" otherButtonTitles:nil, nil];        [alert show];}];// 上传进度//    [operation setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {////    }];[[NSOperationQueue mainQueue] addOperation:operation];

// json数据解析成NSDictionaryNSDictionary *parseData = [NSJSONSerialization JSONObjectWithData:_jsonData options:NSJSONReadingMutableLeaves error:&error];// NSDictionary转换成json()NSData *jsonData = http://www.mamicode.com/[NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];