iOS用原生NSURLSession进行网络请求
1.概况
2.使用步骤
1.创建会话NSURLSession（三种方式）
2.创建task（可创建三种类型的task）
3.开始任务
具体的步骤如下
2.1.创建NSURLSession ()
三种创建方式：
1）直接创建
NSURLSession *session=[NSURLSession sharedSession];
（2）配置后创建
[NSURLSession sessionWithConfiguration:defaultSessionConfiguration];
（3）设置加代理获得
//使用代理方法需要设置代理,但是session的delegate属性是只读的,要想设置代理只能通过这种方式创建session
NSURLSession *session=[NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]
delegate:self
delegateQueue:[[NSOperationQueuealloc]init]];
2.2创建Task
NSURLSessionDataTask 普通任务
NSURLSessionDownloadTask 下载任务
NSURLSessionUploadTask上传任务
1.get请求
创建方式主要有两种
GET1 : 使用request创建task
- (void)jsonTest {
NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession * session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];
NSString * url = [NSString stringWithFormat:@"http://api.androidhive.info/volley/person_object.json"];
NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
NSURLSessionDataTask * task = [session dataTaskWithRequest:request];
self.task = task;
}
GET2: 使用URL创建Task
//图片请求 get
- (void)imgTest {
NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession * session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//这是个gif图、懒得弄了。方便暂停用的
NSString * url = [NSString stringWithFormat:@"https://upfile.asqql.com/2009pasdfasdfic2009s305985-ts/2018-4/2018423202071807.gif"];
NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
NSURLSessionDataTask * task = [session dataTaskWithRequest:request];
self.task = task;
}
2.post请求
在上传任务里
//图片上传 post
- (void)upDataTest {
NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession * session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//这是个gif图、懒得弄了。方便暂停用的
NSString * url = [NSString stringWithFormat:@"http://www.chuantu.biz/upload.php"];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
request.HTTPMethod = @"POST";
NSString *path = [[NSBundle mainBundle]pathForResource:@"tu" ofType:@"gif"];
NSURLSessionUploadTask * task = [session uploadTaskWithRequest:request fromFile:[NSURL URLWithString:path]];
self.task = task;
}
下载任务创建task
//下载任务
- (void)downLoadTest {
NSURLSessionConfiguration * configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession * session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//这是个gif图、懒得弄了。方便暂停用的
NSString * url = [NSString stringWithFormat:@"https://upfile.asqql.com/2009pasdfasdfic2009s305985-ts/2018-4/2018423202071807.gif"];
NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
NSURLSessionDownloadTask * task;
if (self.resumeData) {
//需要服务器支持断点续传
task = [session downloadTaskWithResumeData:self.resumeData];
}else {
task = [session downloadTaskWithRequest:request];
}
self.task = task;
}
2.3开始任务
[self.task resume];开始
[self.task cancel];取消
[self.task suspend];暂停
用原生的网络封装一个get post请求
get请求
+ (void)getWithUrlString:(NSString *)url parameters:(id)parameters success:(SuccessBlock)successBlock failure:(FailureBlock)failureBlock
{
NSMutableString *mutableUrl = [[NSMutableString alloc] initWithString:url];
if ([parameters allKeys]) {
[mutableUrl appendString:@"?"];
for (id key in parameters) {
NSString *value = [[parameters objectForKey:key] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
[mutableUrl appendString:[NSString stringWithFormat:@"%@=%@&", key, value]];
}
}
NSString *urlEnCode = [[mutableUrl substringToIndex:mutableUrl.length - 1] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:urlEnCode]];
NSURLSession *urlSession = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [urlSession dataTaskWithRequest:urlRequest completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (error) {
failureBlock(error);
} else {
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
successBlock(dic);
}
}];
[dataTask resume];
}
post请求
+ (void)postWithUrlString:(NSString *)url parameters:(id)parameters success:(SuccessBlock)successBlock failure:(FailureBlock)failureBlock
{
NSURL *nsurl = [NSURL URLWithString:url];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:nsurl];
//如果想要设置网络超时的时间的话，可以使用下面的方法：
//NSMutableURLRequest *mutableRequest=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
//设置请求类型
request.HTTPMethod = @"POST";
NSString *postStr = [NetworkManager parseParams:parameters];
//把参数放到请求体内
request.HTTPBody = [postStr dataUsingEncoding:NSUTF8StringEncoding];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
if (error) { //请求失败
failureBlock(error);
} else { //请求成功
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
successBlock(dic);
}
}];
[dataTask resume]; //开始请求
}
//把NSDictionary解析成post格式的NSString字符串
+ (NSString *)parseParams:(NSDictionary *)params
{
NSString *keyValueFormat;
NSMutableString *result = [NSMutableString new];
NSMutableArray *array = [NSMutableArray new];
//实例化一个key枚举器用来存放dictionary的key
NSEnumerator *keyEnum = [params keyEnumerator];
id key;
while (key = [keyEnum nextObject]) {
keyValueFormat = [NSString stringWithFormat:@"%@=%@&", key, [params valueForKey:key]];
[result appendString:keyValueFormat];
[array addObject:keyValueFormat];
}
return result;
}
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