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1. get请求
1> 确定URL
2> 创建请求
3> 发送连接请求(网络请求用异步函数)
- (void)get{// 1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login?username=520it&pwd=520it&type=JSON"];// 2.请求NSURLRequest *request = [NSURLRequest requestWithURL:url];// 3.连接[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];NSLog(@"%@", dict[@"success"]);}];}
2. post请求
1> 确定URL
2> 创建请求
设置请求方法
设置请求体(用户名和密码包装在请求体中)
3> 发送连接请求(网络请求用异步函数)
- (void)post{// 1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];// 2.请求NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];// 3.请求设置方法request.HTTPMethod = @"POST";// 设置请求体request.HTTPBody = [@"username=lisi&pwd=123456&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];// 4.连接[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];NSLog(@"%@",dict[@"error"]);}];}
3. 中文转码
NSString *str = [NSString stringWithFormat:@"username=文刂Rn&pwd=123456&type=JSON", self.userTextField.text, self.pwdTextField.text];// 中文转码str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
1. JSON文件解析用NSJSONSerialization对象解析
NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
2. JSON文件解析后转模型(MJExtention)
如果模型中的变量名和字典中的key有不一样的,需要先声明用什么替换
// 告诉id 用ID替换[LDVideo setupReplacedKeyFromPropertyName:^NSDictionary *{return @{@"ID" : @"id"};}];
字典数组转模型
self.videos = [LDVideo objectArrayWithKeyValuesArray:dictArray];
字典转模型
[self.videos addObject:[LDVideo objectWithKeyValues:attributeDict]];
1. NSXMLParser 使用SAX(从根元素开始解析,一个元素一个元素的向下解析)方式解析,可用于大小文件解析
1> 创建NSXMLParser并设置代理,解析在代理方法中实现
- (void)viewDidLoad {[super viewDidLoad];// 1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/video?type=XML"];// 2.请求NSURLRequest *request = [NSURLRequest requestWithURL:url];// 3.连接[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {// 4.解析NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];parser.delegate = self;// 开始解析,会阻塞直到数据解析完毕[parser parse];// 5.刷新[[NSOperationQueue mainQueue] addOperationWithBlock:^{[self.tableView reloadData];}];}];}
2> 代理方法实现
开始解析xml文件
// 开始解析xml文件- (void)parserDidStartDocument:(NSXMLParser *)parser{}
开始解析元素,解析出来元素(存放在字典中)后用MJExention转为模型
// 开始解析元素- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{if ([elementName isEqualToString:@"videos"]) return;// 设置id用ID转换[LDVideo setupReplacedKeyFromPropertyName:^NSDictionary *{return @{@"ID" : @"id"};}];// MJExtension 字典转模型[self.videos addObject:[LDVideo objectWithKeyValues:attributeDict]];}
某个元素解析完成
// 某个元素解析完成- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{}
整个xml文件解析完毕
// 整个xml文件解析完毕- (void)parserDidEndDocument:(NSXMLParser *)parser{}
2. GDataParser解析XML,使用DOM(一次性将整个XML文档加载到内存中解析)方式解析,可用于小文件解析
1> 创建GDataParser对象加载xml二进制数据
2> 解析xml内的元素存放到数组中
3> 遍历数组将对于的值赋值给模型中的属性
- (void)viewDidLoad {[super viewDidLoad];// 1.urlNSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/video?type=XML"];// 2.请求NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];// 3.连接[NSURLConnection sendAsynchronousRequest:request queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {// 解析xml文件GDataXMLDocument *doc = [[GDataXMLDocument alloc] initWithData:data options:kNilOptions error:nil];// 解析video元素NSArray *elementArray = [doc.rootElement elementsForName:@"video"];// 遍历数组for (GDataXMLElement *element in elementArray) {LDVideo *video = [[LDVideo alloc] init];// 将字典中的值赋值给模型对象的属性video.ID = [element attributeForName:@"id"].stringValue.integerValue;video.name = [element attributeForName:@"name"].stringValue;video.length = [element attributeForName:@"length"].stringValue.integerValue;video.image = [element attributeForName:@"image"].stringValue;video.url = [element attributeForName:@"url"].stringValue;[self.videos addObject:video];NSLog(@"%@", [element attributeForName:@"id"]);NSLog(@"=====%zd", self.videos.count);}// 刷新UI[[NSOperationQueue mainQueue] addOperationWithBlock:^{[self.tableView reloadData];}];}];}
四. 小文件下载
1. 直接加载文件的URL进行下载
-(void)dataDownload {//1.确定资源路径NSURL *url = [NSURLURLWithString:@"http://120.25.226.186:32812/resources/images/minion_01.png"];//2.根据URL加载对应的资源NSData *data = [NSData dataWithContentsOfURL:url];//3.转换并显示数据UIImage *image = [UIImage imageWithData:data];self.imageView.image = image;}
2. 发送异步函数请求下载
-(void)connectDownload {//1.确定请求路径 NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/images/minion_01.png"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.使用NSURLConnection发送一个异步请求[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {//4.拿到并处理数据UIImage *image = [UIImage imageWithData:data];self.imageView.image = image;}];}
3. 通过NSURLConnection设置代理发送异步请求的方式下载文件
-(void)connectionDelegateDownload {//1.确定请求路径 NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/resources/videos/minion_01.mp4"];//2.创建请求对象NSURLRequest *request = [NSURLRequest requestWithURL:url];//3.使用NSURLConnection设置代理并发送异步请求[NSURLConnection connectionWithRequest:request delegate:self];}
4. 代理方法
当接收到服务器响应的时候调用，该方法只会调用一次
//当接收到服务器响应的时候调用，该方法只会调用一次-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{//创建一个容器，用来接收服务器返回的数据 self.fileData = [NSMutableData data];//获得当前要下载文件的总大小（通过响应头得到）NSHTTPURLResponse *res = (NSHTTPURLResponse *)response;self.totalLength = res.expectedContentLength;NSLog(@"%zd",self.totalLength);//拿到服务器端推荐的文件名称self.fileName = res.suggestedFilename;}
//当接收到服务器返回的数据时会调用 //该方法可能会被调用多次-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{// NSLog(@"%s",func);//拼接每次下载的数据[self.fileData appendData:data];//计算当前下载进度并刷新UI显示self.currentLength = self.fileData.length;NSLog(@"%f",1.0* self.currentLength/self.totalLength);self.progressView.progress = 1.0* self.currentLength/self.totalLength;}
当网络请求结束之后调用
//当网络请求结束之后调用-(void)connectionDidFinishLoading:(NSURLConnection *)connection{//文件下载完毕把接受到的文件数据写入到沙盒中保存//1.确定要保存文件的全路径//caches文件夹路径NSString *caches = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject];NSString *fullPath = [caches stringByAppendingPathComponent:self.fileName];//2.写数据到文件中[self.fileData writeToFile:fullPath atomically:YES];NSLog(@"%@",fullPath);}
当请求失败的时候调用该方法
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{NSLog(@"%s",func);}
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原文地址：http://www.cnblogs.com/Xfsrn/p/5000325.html
