iOS : 互联网连接可用但网络服务调用出现超时错误，相同的网络服务正在 android

Question

这是我的网络服务调用。如果我连续调用网络服务，一段时间后开始出现超时错误，但互联网可用。

相同的 Web 服务在 android

中正常工作

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
request.timeoutInterval = 30;
request.URL = [NSURL URLWithString:finalURL];
request.HTTPMethod = @"POST";
[request setValue:@"123456" forHTTPHeaderField:@"header"];

if (parameters != nil) {
    NSMutableData * body = [[NSMutableData alloc] init];
    NSString *boundary = @"---------------------------V2ymHFg03ehbqgZCaKO6jy";
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField:@"Content-Type"];

    for (id key  in parameters) {
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@", [parameters objectForKey:key]] dataUsingEncoding:NSUTF8StringEncoding]];
    }
    [request addValue:[NSString stringWithFormat:@"%lu", (unsigned long)[body length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:body];

}

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error){


    // This will get the NSURLResponse into NSHTTPURLResponse format
    NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
    if (httpResponse.statusCode == 200) {

        NSMutableDictionary *JSON = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
        dispatch_async(dispatch_get_main_queue(), ^{
            NSLog( @"Response = %@",JSON);

        });

    } else {
        NSLog( @"Error = %@",error);

    }


}];

Answer 1

试试这个：

NSString *strServicePath = @"YourURLString";
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:strServicePath]];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalCacheData];
[request setHTTPShouldHandleCookies:NO];
[request setTimeoutInterval:60];
[request setHTTPMethod:@"POST"];

NSString *boundary = [NSString stringWithFormat:@"Boundary-%@", [[NSUUID UUID] UUIDString]];

// set Content-Type in HTTP header
NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
[request setValue:contentType forHTTPHeaderField: @"Content-Type"];

NSDictionary *_params = [NSDictionary dictionaryWithObjectsAndKeys:yourValue,@"yourKey",nil];

// post body
NSMutableData *body = [NSMutableData data];
[body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

for (NSString *param in _params) {
    NSMutableString *strPart = [NSMutableString stringWithFormat:@"%@",[self createPartWithKey:param value:[_params objectForKey:param] boundary:boundary encoding:@"8bit" contentType:@"text/plain" contentFilename:@""]];
    [body appendData:[strPart dataUsingEncoding:NSUTF8StringEncoding]];
}

//You can give your own strProfileImageName                
NSString *strProfileImageName = [NSString stringWithFormat:@"%@_%@_.jpg",@"some_pic",_userID];

if (imageData) {
   [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
   [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@; filename=%@\r\n", @"some_pic",strProfileImageName] dataUsingEncoding:NSUTF8StringEncoding]];
   [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
   [body appendData:imageData];
   [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
}
[body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
// setting the body of the post to the reqeust
[request setHTTPBody:body];

// set the content-length
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[body length]];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];

[NSURLConnection sendAsynchronousRequest:request queue:      [NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
     //Your Code Here

}];

尝试在这实现。希望这有帮助。

Answer 2

您似乎访问了错误的数组。

for (id key  in parameters) {
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@", [parameters objectForKey:key]] dataUsingEncoding:NSUTF8StringEncoding]];
    }

上面代码中的参数似乎是一个字符串数组而不是字典。

您可以改用下面的代码。

[parameters enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj,BOOL *_Nonnull stop) {
        [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@", obj] dataUsingEncoding:NSUTF8StringEncoding]];
    }];

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