IOS学习笔记（16）网络请求，json解析(3)_H5之家 - 中国HTML5教程资源分享第一站

通常我们的URL请求可能是一组，并不是一个，而且我们的URL请求也是会不停的根据流程在变化的，所以我们要仍然使用NSURLRequest这个对象是不能随时的进行一个URL的变化的，因此我们的NSmutableURLRequest这个对象，可以用来解决我们这个问题。

在分配和初始化了请求之后修改请求url的timeout：

NSString *urlAsString = @"";

NSURL *url = [NSURL URLWithString:urlAsString];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[urlRequest setTimeoutInterval:30.0f];

在分配和初始化了请求之后设置请求的URL和timeout：

NSString *urlAsString = @"";

NSURL *url = [NSURL URLWithString:urlAsString];

NSMutableURLRequest *request = [NSMutableURLRequest new];

[urlRequest setTimeoutInterval:30.0f];

[urlRequest setURL:url];

通过NSURLConnection发送一个HTTP GET 请求

你想通过Http协议向服务器发送一个Get的包装请求，并在这个请求中添加了一些请求参数

NSString *urlAsString = @"";

urlAsString = [urlAsString stringByAppendingString:@"?param1 = First"];

urlAsString = [urlAsString stringByAppendingString:@"&param2 = Second"];

NSURL *url = [NSURL URLWithString:urlAsString];

NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

[urlRequest setTimeoutInterval:30.0f];

[urlRequest setHTTPMethod:@"GET"];

NSOperationQueue *queue = [[NSOperationQueue alloc]init];

[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandle:^(NSURLResponse *response,NSData *data,NSError *error){

if([data length]>0 && error == nil){

NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8String];

NSLog(@"HTML = %@",html);

}else if([data length] ==0 && error == nil ){

NSLog(@"Nothing was downloaded.");

}else if(error != nil){

NSLog(@"Error happened = %@",error);

}

}];

编译效果：

html =

<html>

<head>

<title>IOS 5 Programming Cookbook GET Example</title>

</head>

<body>

HTTP Method=GET Query String =Array([param1] =>First [param2]=>Second)

</body>

</html>

通过NSURLConnection发送一个POST表单请求

NSString *urlAsString = @"";

urlAsString = [urlAsString stringByAppendingString:@"?param1 = First"];

urlAsString = [urlAsString stringByAppendingString:@"&param2 = Second"];

NSURL *url = [NSURL URLWithString:urlAsString];

NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:url];

[urlRequest setTimeoutInterval:30.0f];

[urlRequest setHTTPMethod:@"POST"];

NSString *body = @"bodyParam1 = BodyValue1&bodyParam2 = BodyValue2";

[urlRequest setHTTPBody:[body dataUsingEncoding:NSUTF8StringEncoding]];

NSOperationQueue *queue = [[NSOperationQueue alloc]init];

[NSURLConnection sendAsynchronousRequest:urlRequest queue:queue completionHandle:^(NSURLResponse *response,NSData *data,NSError *error){

if([data length]>0 && error == nil){

NSString *html = [[NSString alloc]initWithData:data encoding:NSUTF8String];

NSLog(@"HTML = %@",html);

}else if([data length] ==0 && error == nil ){

NSLog(@"Nothing was downloaded.");

}else if(error != nil){

NSLog(@"Error happened = %@",error);

}

}];

编译效果：

html =

<html>

<head>

<title>IOS 5 Programming Cookbook POST Example</title>

</head>

<body>

HTTP Method=POST Query String =Array([param1] =>First [param2]=>Second)

Body parameters = Array([bodyParam1]=>BodyValue1 [bodyParam2]=>BodyValue2)

</body>

</html>

通过NSURLConnection发生HTTP DELETE 请求

通过HTTP协议向服务器发送一个删除资源的一个URL链接，同时你也可以给这个请求添加参数

将[urlRequest setHTTPMethod:@"POST"];

改为[urlRequest setHTTPMethod:@"DELETE"];

通过NSURLConnection发送HTTP PUT请求

就像发送POST，GET，DELETE请求一样。将相应位置设置成PUT；

把Array和Dictionaries序列化成JSON对象

通过NSJSONSerialization这个类的dataWithJSONObject:options:error:方法来实现

NSMutableDictionary *dictionary = [[NSMutableDictionary alloc]init];

[dictionary setValue:@"Anthony" forKey:@"First Name"];

[dictionary setValue:@"Robbins" forKey:@"Last Name"];

[dictionary setValue:[NSNumber numberWithUnsignedInteger:51] forKey:@"Age"];