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國(guó)家氣象局提供的天氣預(yù)報(bào)接口
接口地址有三個(gè):
http://www.weather.com.cn/data/sk/101010100.html
http://www.weather.com.cn/data/cityinfo/101010100.html
http://m.weather.com.cn/data/101010100.html
第三接口信息較為詳細(xì),提供的是6天的天氣,關(guān)于API所返回的信息請(qǐng)見開源免費(fèi)天氣預(yù)報(bào)接口API以及全國(guó)所有地區(qū)代碼?。。▏?guó)家氣象局提供),全國(guó)各城市對(duì)應(yīng)這一個(gè)id號(hào),根據(jù)改變id好我們就可以解析出來(lái)各個(gè)城市對(duì)應(yīng)天氣;
Json以其輕巧簡(jiǎn)單成為較為流行文件格式,在手機(jī)上傳輸比XML快,iOS5以前蘋果公司并沒有對(duì)Json解析提供庫(kù)文件支持,但是好在有一些大牛們專門為Objective-c只做了能夠解析Json文件的庫(kù),iOS蘋果公司提供了對(duì)json的原生支持類NSJSONSerialization;本文將介紹TouchJson SBJson 和iOS5所支持的原生的json方法,解析國(guó)家氣象局API,TouchJson和SBJson需要下載他們的庫(kù)
TouchJson http://download.csdn.net/detail/duxinfeng2010/4484144
SBJson http://download.csdn.net/detail/duxinfeng2010/4484842
1.創(chuàng)建一個(gè)新工程叫JsonThreeDemo; File->New->Project ->single View Application -> next,注意不使用ARC,不要勾選Use Automatic Refrence Counting,否則運(yùn)行時(shí)候庫(kù)文件中會(huì)報(bào)錯(cuò)
2.使用TouchJson庫(kù)需要添加頭文件 #import "CJSONDeserializer.h",使用SBJson需要添加頭文件 #import "SBJson.h"然后打開XIB添加三個(gè)button,讓添加三個(gè)方法
- (IBAction)buttonPressedone:(id)sender;
- (IBAction)buttonPressedtwo:(id)sender;
- (IBAction)buttonPressedthree:(id)sender;
3.三個(gè)解析方法都類似
TouchJson庫(kù)解析北京天氣
- (IBAction)buttonPressedone:(id)sender { // 獲取API接口 NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101010100.html"]; // 定義一個(gè)NSError對(duì)象,用于捕獲錯(cuò)誤信息 NSError *error; // NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error]; // NSLog(@"jsonstring--->%@",jsonString); // 將解析得到的內(nèi)容存放字典中,編碼格式UTF8,防止取值時(shí)候發(fā)生亂碼 NSDictionary *rootDic = [[CJSONDeserializer deserializer] deserialize:[jsonString dataUsingEncoding:NSUTF8StringEncoding] error:&error]; // 因?yàn)榉祷氐腏son文件有兩層,去第二層類容放到字典中去0 NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"]; // 取值打印 NSLog(@"今天是 %@ %@ %@ 的天氣狀況是:%@ %@",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"],[weatherInfo objectForKey:@"temp1"]); }
- (IBAction)buttonPressedtwo:(id)sender { NSURL *url = [NSURL URLWithString:@"http://m.weather.com.cn/data/101180701.html"]; NSError *error=nil; NSString *jsonString = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:&error]; SBJsonParser *parser = [[SBJsonParser alloc]init]; NSDictionary *rootDic = [parser objectWithString:jsonString error:&error]; NSDictionary *weatherInfo = [rootDic objectForKey:@"weatherinfo"]; NSLog(@"今天是 %@ %@ %@ 的天氣狀況是:%@ %@",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"],[weatherInfo objectForKey:@"temp1"]); }
- (IBAction)buttonPressedthree:(id)sender { NSError *error; // 加載一個(gè)NSURL對(duì)象 NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://m.weather.com.cn/data/101180601.html"]]; // 將請(qǐng)求的url數(shù)據(jù)放到NSData對(duì)象中 NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil]; // iOS5自帶解析類NSJSONSerialization從response中解析出數(shù)據(jù)放到字典中 NSDictionary *weatherDic = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error]; // weatherDic字典中存放的數(shù)據(jù)也是字典型,從它里面通過鍵值取值 NSDictionary *weatherInfo = [weatherDic objectForKey:@"weatherinfo"]; NSLog(@"今天是 %@ %@ %@ 的天氣狀況是:%@ %@",[weatherInfo objectForKey:@"date_y"],[weatherInfo objectForKey:@"week"],[weatherInfo objectForKey:@"city"],[weatherInfo objectForKey:@"weather1"],[weatherInfo objectForKey:@"temp1"]); // 打印出weatherInfo字典所存儲(chǔ)數(shù)據(jù) NSLog(@"weatherInfo字典里面的內(nèi)容是--->%@",[weatherInfo description]); }
我們用到了這樣一個(gè)類方法
+ (NSData *)sendSynchronousRequest:(NSURLRequest *)request returningResponse:(NSURLResponse **)response error:(NSError **)error
4.運(yùn)行結(jié)果(如果想知道每次字符串和字典間取值情況,只需NSLog打印輸出就行):
5.再解析取值的時(shí)候花費(fèi)了一些時(shí)間,取值時(shí)發(fā)生應(yīng)用程序崩潰,獲取值不正確
有時(shí)我們從字典中獲取了這樣的數(shù)據(jù),感覺比較郁悶,并未顯示中文,這種情況是我們把數(shù)據(jù)放到字典中,編碼方式是UTF8,取值打印出來(lái)的時(shí)候就成中文了
在解析出來(lái)數(shù)據(jù)后我想這樣取值,
NSDictionary *weatherInfo = [rootDicobjectForKey:@"weatherinfo"];
NSArray *weatherArray = [rootDicobjectForKey:@"weatherinfo"];
for (NSDictionary *dicin weatherArray) {
NSLog(@"----->%@",dic);
}
打印出來(lái)的dic數(shù)據(jù)是這樣的
NSLog(@"----->%@",[dicobjectForKey:@"city"]);來(lái)取出city的值,但是應(yīng)用程序崩潰
源代碼:http://download.csdn.net/detail/duxinfeng2010/4484818
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