1. get是从服务器上获取数据，post是向服务器传送数据。
2. get是把参数数据队列加到提交表单的ACTION属性所指的URL中，值和表单内各个字段一一对应，
在URL中可以看到。post是通过HTTP post机制，将表单内各个字段与其内容放置在HTML HEADER内一起
传送到ACTION属性所指的URL地址。用户看不到这个过程。
3. 对于get方式，服务器端用Request.QueryString获取变量的值，对于post方式，服务器端用Request.
Form获取提交的数据。
4.get是明文传输，post是转为NSData
同步：提交请求->等待服务器处理->处理完毕返回 这个期间客户端浏览器不能干任何事
异步: 请求通过事件触发->服务器处理（这是浏览器仍然可以作其他事情）->处理完毕
//get的同步请求
-(void)getAndSynchronize
{
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
//创建请求
NSURLRequest *req = [NSURLRequest requestWithURL:url];
//创建同步链接
NSData *data = [NSURLConnection sendSynchronousRequest:req returningResponse:nil error:nil];
//json解析
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSLog(@"11%@",dic);
}
//get的异步请求，使用block方法
-(void)getAndAsynchronize
{
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx?date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
//创建请求
NSURLRequest *req = [NSURLRequest requestWithURL:url];
__block NSDictionary *dic = [NSDictionary dictionary];
//创建异步
[NSURLConnection sendAsynchronousRequest:req queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
NSLog(@"%@",dic);
}];
NSLog(@"异步链接下面");
}
//post同步请求
-(void)postAndSynchronize
{
//post请求，一般只包含 协议://host/路径
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
//请求方式为post，所有要创建为NSMutableURLRequest
NSMutableURLRequest *mReq = [[NSMutableURLRequest alloc]initWithURL:url];
//设置情感方式，不设置时，默认为GET请求
[mReq setHTTPMethod:@"POST"];
//创建参数
NSString *pStr = @"date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *pData = [pStr dataUsingEncoding:NSUTF8StringEncoding];
//设置参数
[mReq setHTTPBody:pData];
//建立同步链接
NSData *resultData = [NSURLConnection sendSynchronousRequest:mReq returningResponse:nil error:nil];
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:resultData options:NSJSONReadingAllowFragments error:nil];
NSLog(@"%@",dic);
}
//POST异步请求
-(void)postAndAsynchronize
{
NSString *str = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
NSURL *url = [NSURL URLWithString:str];
NSMutableURLRequest *mReq = [NSMutableURLRequest requestWithURL:url];
//cahce策略，超时time
NSMutableURLRequest *mReq1 = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:30];
[mReq setHTTPMethod:@"POST"];
//设置参数
NSString *pStr = @"date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *pData = [pStr dataUsingEncoding:NSUTF8StringEncoding];
[mReq setHTTPBody:pData];
//1.block
__block NSDictionary *dic = [NSDictionary dictionary];
//建立异步链接
[NSURLConnection sendAsynchronousRequest:mReq queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
// NSLog(@"%@",dic);
}];
//2.使用协议代理方法
NSURLConnection *conn = [NSURLConnection connectionWithRequest:mReq delegate:self];
}
#pragma mark -- connect的异步代理方法
//开始
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
NSLog(@"开始相应，可以在此代理方法中初始化容器");
_mData = [[NSMutableData alloc]init];
}
//接收数据，data只是数据片段，不是完整数据，需要拼接
-(void)connection:(NSURLConnection *)connection didReceiveData:(nonnull NSData *)data
{
NSLog(@"开始返回数据片段");
[_mData appendData:data];
}
//本次链接完成
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSLog(@"链接完成");
//可以在此解析数据
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:self.mData options:NSJSONReadingAllowFragments error:nil];
NSLog(@"%@",dic);
}
//链接出错
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(@"error - %@",error);
}
//session get block
-(void)sessionGet
{
//第一种方式创建session，单例，获取全局session对象
NSURLSession *session = [NSURLSession sharedSession];
//第二种方式创建session，可以给session设置工作模式
// NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
// NSURLSession *session = [NSURLSession sessionWithConfiguration:config];
//创建url对象
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/
publish/Handler/APINewsList.ashx?date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
// //建立请求任务.block方式，通过url建立task，不需要建立request
// NSURLSessionDataTask *task = [session dataTaskWithURL:url
completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error)
{
//
// //解析数据
//
// }];
//如果需要设置缓存策略、请求超时等,需要创建请求对象request
NSURLRequest *req = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:30];
//通过request方式建立任务
NSURLSessionTask *task = [session dataTaskWithRequest:req
completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error)
{
NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",str);
}];
//启动任务
[task resume];
}//session post delegate
-(void)sessionDelegate
{
//创建url对象
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
//创建参数
NSString *pStr = @"date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *pData = [pStr dataUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *mReq = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30];
//设置请求超时
[mReq setTimeoutInterval:30];
[mReq setCachePolicy:NSURLRequestReloadIgnoringCacheData];
[mReq setHTTPMethod:@"POST"];
[mReq setHTTPBody:pData];
//代理的方法,主线程
NSURLSession *session_1 = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
//创建任务（因为要使用代理方法，就不需要block方法初始化）
NSURLSessionDataTask *task_1 = [session_1 dataTaskWithRequest:mReq];
//启动
[task_1 resume];
}
#pragma mark -- session delegate
//服务器开始响应，准备返回数据
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveResponse:(NSURLResponse *)response completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
//运行出来服务器的响应
completionHandler(NSURLSessionResponseAllow);
//当网络请求是基于http协议的时候，response的本质为NSHTTPURLResponse
// NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse*)response;
//初始化容器
_mData = [NSMutableData data];
}
//客户端接收数据
-(void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask didReceiveData:(NSData *)data
{
[_mData appendData:data];
}
//数据请求完成网络请求成功，当error不为空，说明响应出错
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
if (error) {
NSLog(@"error -- %@",error);
}
else
{
NSString *str = [[NSString alloc]initWithData:_mData encoding:NSUTF8StringEncoding];
NSLog(@"delegate -- %@",str);
}
}
-(void)sessionPost
{
//创建url对象
NSString *urlStr = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/publish/Handler/APINewsList.ashx";
//得到网址
NSURL *url = [NSURL URLWithString:urlStr];
//创建参数
NSString *pStr = @"date=20151031&startRecord=1&len=5&udid=1234567890&terminalType=Iphone&cid=213";
NSData *pData = [pStr dataUsingEncoding:NSUTF8StringEncoding];
//创建request
NSMutableURLRequest *mReq = [[NSMutableURLRequest alloc]initWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30];
//设置
[mReq setHTTPMethod:@"POST"];
[mReq setHTTPBody:pData];
//建session
NSURLSession *session = [NSURLSession sharedSession];
//加载任务的数据对象
NSURLSessionTask *task = [session dataTaskWithRequest:mReqcompletionHandler:^
(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error)
{
NSString *str = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"%@",str); }];
//开启任务
[task resume];
}
-(void)startDownLoadVideo
{
NSURLSessionConfiguration *configure = [NSURLSessionConfiguration defaultSessionConfiguration];//默认设置
//初始化session
self.currentSession = [NSURLSession sessionWithConfiguration:configure delegate:self delegateQueue:nil];
//描述
self.currentSession.sessionDescription = self.downLoadVideoModel.flv;
//下载地址
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://sc.111ttt.com/up/mp3/39165/2EC8D31900361E607A92BC17EDAFF6BC.mp3"]];
self.task = [self.currentSession downloadTaskWithRequest:request];
[self.task resume];//任务开始
_isDownLoading = YES;
while (_isDownLoading) {
//当前线程一直跑？
[[NSRunLoop currentRunLoop]runUntilDate:[NSDate distantFuture]];
}
}
#pragma mark -- session代理方法
//下载完成
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location
{
NSFileManager *fileManager = [NSFileManager defaultManager];
NSArray *URLs = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask];
NSURL *documentsDirectory = [URLs objectAtIndex:0];
//下载任务的url
NSURL *originalURL = [[downloadTask originalRequest] URL];
//存储位置的url
NSURL *destinationURL = [documentsDirectory URLByAppendingPathComponent:[originalURL lastPathComponent]];
NSError *errorCopy;
// For the purposes of testing, remove any esisting file at the destination.
//移除目标url上的内容
[fileManager removeItemAtURL:destinationURL error:NULL];
//移动
BOOL success = [fileManager copyItemAtURL:location toURL:destinationURL error:&errorCopy];
if (success) {
dispatch_async(dispatch_get_main_queue(), ^{
self.destinationURL = destinationURL;
});
} else {
NSLog(@"复制文件发生错误: %@", [errorCopy localizedDescription]);
}
}
//收到数据的代理
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite
{
NSLog(@"上此执行代理到此次传送的字节数 %lld , 已经下载的总量%lld , 总共要下载的%lld",bytesWritten,totalBytesWritten,totalBytesExpectedToWrite);
//进度
double progress = (double)totalBytesWritten / totalBytesExpectedToWrite;
dispatch_async(dispatch_get_main_queue(), ^{
self.progressView.progress = progress;
self.progressLabel.text = [NSString stringWithFormat:@"%% %.0f",progress*100];
});
}
//下载完成后执行
-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didCompleteWithError:(NSError *)error
{
if (error == nil) {
NSLog(@"任务: %@ 成功完成", task);
} else {
NSLog(@"任务: %@ 发生错误: %@", task, [error localizedDescription]);
}
}
//恢复下载后执行的方法
-(void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes
{
NSLog(@"%.0f",fileOffset/(float)expectedTotalBytes);
}