iOS—请求Web Service

1、iOS SDK 同步GET请求

　　NSString *strURL = [[NSString alloc] initWithFormat:@"http://www.51work6.com/service/mynotes/[email protected]&type=JSON&action=query"];
   strURL = [strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

　　NSURL *url = [NSURL URLWithString:strURL];

　　NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    NSData *data  = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    NSLog(@"请求完成...");
    NSDictionary *resDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
    NSLog(@"resDict:%@",resDict);

2、iOS SDK 异步GET请求

/*
 * 开始请求Web Service
 */
-(void)startRequest
{

    NSString *strURL = [[NSString alloc] initWithFormat:@"http://www.weather.com.cn/adat/sk/101010100.html"];
    strURL = [strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

	NSURL *url = [NSURL URLWithString:strURL];

	NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];

    NSURLConnection *connection = [[NSURLConnection alloc]
                                   initWithRequest:request
                                   delegate:self];
    if (connection) {
        self.datas = [NSMutableData new];
    }
}

#pragma mark- NSURLConnection 回调方法
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.datas appendData:data];
}

-(void) connection:(NSURLConnection *)connection didFailWithError: (NSError *)error {

    NSLog(@"%@",[error localizedDescription]);
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection {
    NSLog(@"请求完成...");
    NSDictionary* dict = [NSJSONSerialization JSONObjectWithData:self.datas options:NSJSONReadingAllowFragments error:nil];
    NSLog(@"dict:%@",dict);
}

iOS SDK POST请求

/*
 * 开始请求Web Service
 */
-(void)startRequest
{

    NSString *strURL = @"http://www.51work6.com/service/mynotes/WebService.php";
    strURL = [strURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSURL *url = [NSURL URLWithString:strURL];

    NSString *post = [NSString stringWithFormat:@"email=%@&type=%@&action=%@", @"[email protected]",@"JSON",@"query"];
    NSData *postData = [post dataUsingEncoding:NSUTF8StringEncoding];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request setHTTPBody:postData];

    NSURLConnection *connection = [[NSURLConnection alloc]
                                   initWithRequest:request
                                   delegate:self];
    if (connection) {
        self.datas = [NSMutableData new];
    }
}

#pragma mark- NSURLConnection 回调方法
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.datas appendData:data];
}

-(void) connection:(NSURLConnection *)connection didFailWithError: (NSError *)error {

    NSLog(@"%@",[error localizedDescription]);
}

- (void) connectionDidFinishLoading: (NSURLConnection*) connection {
    NSLog(@"请求完成...");
    NSDictionary* dict = [NSJSONSerialization JSONObjectWithData:self.datas options:NSJSONReadingAllowFragments error:nil];
}

GET方法是向指定资源发出请求，只用在读取数据。POST方法是向指定资源提交数据，请求服务器进行处理

同步请求是指：发送方发出数据后，等接收方发回响应以后才发下一个数据包的通讯方式。  
异步请求是指：发送方发出数据后，不等接收方发回响应，接着发送下个数据包的通讯方式。

MKNetworkKit框架 GET请求

/*
 * 开始请求Web Service
 */
-(void)startRequest
{
    NSDictionary *[email protected]{@"format": @"2",@"cityname": @"南京",@"key": @"1174d1a31d33b1dacb69d15c7756f898"};

    MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"v.juhe.cn" customHeaderFields:nil];   //HostName不能加HTTP：//
    MKNetworkOperation *op = [engine operationWithPath:@"/weather/index" params:parameter httpMethod:@"GET" ssl:NO];

    [op addCompletionHandler:^(MKNetworkOperation *operation) {

        NSLog(@"responseData : %@", [operation responseString]);  //显示中文，但输出无格式
        NSData *data  = [operation responseData];
        NSDictionary *resDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];

        NSLog(@"数据：%@",resDict);    //不显示中文，但输出有格式

    } errorHandler:^(MKNetworkOperation *errorOp, NSError* err) {
        NSLog(@"MKNetwork请求错误 : %@", [err localizedDescription]);
    }];
    [engine enqueueOperation:op];

}

MKNetworkKit框架  POST请求    待修改

/*
 * 开始请求Web Service
 */
-(void)startRequest
{
    NSString *path = [[NSString alloc] initWithFormat:@"/weather/index"];

    NSMutableDictionary *param = [[NSMutableDictionary alloc] init];
    [param setValue:@"2" forKey:@"format"];
    [param setValue:@"苏州" forKey:@"cityname"];
    [param setValue:@"1174d1a31d33b1dacb69d15c7756f898" forKey:@"key"];

    MKNetworkEngine *engine = [[MKNetworkEngine alloc] initWithHostName:@"v.juhe.cn" customHeaderFields:nil];
    MKNetworkOperation *op = [engine operationWithPath:path params:param httpMethod:@"POST"];

    [op addCompletionHandler:^(MKNetworkOperation *operation) {

        NSLog(@"responseData : %@", [operation responseString]);
        NSData *data  = [operation responseData];
        NSDictionary *resDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];

        [self reloadView:resDict];

    } errorHandler:^(MKNetworkOperation *errorOp, NSError* err) {
        NSLog(@"MKNetwork请求错误 : %@", [err localizedDescription]);
    }];
    [engine enqueueOperation:op];

}