网络数据请求方式（SOAP和JSON）

从网络上进行数据的请求主要有SOAP方式和JSON方式，下面是我在看天气预报的例子时比较的两种方式的不同，在这里Mark一下。

SOAP方式：

使用SOAP获得天气预报支持的省直辖市信息

//封装soap请求消息

NSString *soapMessage = [NSString
stringWithFormat:

@"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"

"<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"

"<soap:Body>\n"

"<getSupportProvince xmlns=\"http://WebXml.com.cn/\">\n"

"</getSupportProvince>\n"

"</soap:Body>\n"

"</soap:Envelope>\n",@"5"
];

//请求发送到的路径

NSURL *url = [NSURL
URLWithString:@"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx"];

NSMutableURLRequest *theRequest = [NSMutableURLRequest
requestWithURL:url];

NSString *msgLength = [NSString
stringWithFormat:@"%d", [soapMessage
length]];

//以下对请求信息添加属性前四句是必有的，第五句是soap信息。

[theRequest
addValue: @"text/xml; charset=utf-8"
forHTTPHeaderField:@"Content-Type"];

[theRequest
addValue: @"http://WebXml.com.cn/getSupportProvince"
forHTTPHeaderField:@"SOAPAction"];

[theRequest addValue: msgLength
forHTTPHeaderField:@"Content-Length"];

[theRequest setHTTPMethod:@"POST"];

[theRequest
setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];

//请求

NSURLConnection *theConnection = [[NSURLConnection
alloc] initWithRequest:theRequest
delegate:self];

//如果连接已经建好，则初始化data

if( theConnection )

{

webData = [[NSMutableData
data] retain];

}

JSON方式：

使用iOS自带解析类NSJSONSerialization方法解析（ios5以上版本支持）

//取得苏州的天气情况

NSError *error;

    //加载一个NSURL对象

    NSURLRequest *request = [NSURLRequest
requestWithURL:[NSURL
URLWithString:@"http://m.weather.com.cn/data/101190401.html"]];
a137

    //将请求的数据放置到NSData中

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

    //利用ios5自带的解析类NSJSONSerialization从response中解析出的数据放到字典中

    NSDictionary *weatherDic = [NSJSONSerialization
JSONObjectWithData:reponse options:NSJSONReadingMutableLeaves
error:&error];

    NSDictionary *weather = [weatherDic
objectForKey:@"weatherinfo"];

    weatherStr = [NSString
stringWithFormat:@"今天是%@,%@,%@\n天气状况是,%@,%@",[weather objectForKey:@"date_y"],[weather objectForKey:@"week"],[weather objectForKey:@"city"],[weather
objectForKey:@"weather1"],[weather objectForKey:@"temp1"]];

    NSLog(@"weather字典里的内容是:%@",weatherDic);