Objective-C语法之NSURL

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有时我们需要获取请求地址的相关信息，这时我们就可以用 NSURL 的一些方法操作来获取它。

需要注意的一点是：请求地址里可能存在特殊字符或中文，为了正确获取信息，建议使用 stringByAddingPercentEscapesUsingEncoding: 对字符串进行编码，然后对应的使用 stringByReplacingPercentEscapesUsingEncoding: 对字符串进行解码。

main.m

 1 #import <Foundation/Foundation.h>
 2 
 3 void testURL(NSString *strUrl) {
 4     strUrl = [strUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //对字符串进行编码
 5     
 6     NSURL *url = [NSURL URLWithString:strUrl];
 7     NSMutableString *mStrInfo = [[NSMutableString alloc] initWithString:@"URL相关信息如下：\n"];
 8     [mStrInfo appendFormat:@"absoluteString: %@\n", [url absoluteString]];
 9     [mStrInfo appendFormat:@"relativeString: %@\n", [url relativeString]];
10     [mStrInfo appendFormat:@"baseURL: %@\n", [url baseURL]];
11     [mStrInfo appendFormat:@"absoluteURL: %@\n", [url absoluteURL]];
12     [mStrInfo appendFormat:@"scheme: %@\n", [url scheme]];
13     [mStrInfo appendFormat:@"resourceSpecifier: %@\n", [url resourceSpecifier]];
14     [mStrInfo appendFormat:@"host: %@\n", [url host]];
15     [mStrInfo appendFormat:@"port: %@\n", [url port]];
16     [mStrInfo appendFormat:@"user: %@\n", [url user]];
17     [mStrInfo appendFormat:@"password: %@\n", [url password]];
18     [mStrInfo appendFormat:@"path: %@\n", [url path]];
19     [mStrInfo appendFormat:@"fragment: %@\n", [url fragment]]; //编码后的字符串，获取到的值为null，而不是正常情况的a=1；最终a=1被作为query的值内容了
20     [mStrInfo appendFormat:@"parameterString: %@\n", [url parameterString]];
21     [mStrInfo appendFormat:@"query: %@\n", [url query]];
22     [mStrInfo appendFormat:@"relativePath: %@\n", [url relativePath]]; //如果baseURL是nil，relativePath就跟path一样
23     [mStrInfo appendFormat:@"pathComponents: %@\n", [url pathComponents]];
24     
25     NSLog(@"%@", [mStrInfo stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]); //对字符串进行解码
26 }
27 
28 int main(int argc, const char * argv[]) {
29     @autoreleasepool {
30         NSString *strUrl = @"http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1";
31         testURL(strUrl);
32     }
33     return 0;
34 }

结果：

 1 2015-06-19 23:17:29.496 OCNSURL[768:34254] URL相关信息如下：
 2 absoluteString: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 3 relativeString: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 4 baseURL: (null)
 5 absoluteURL: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 6 scheme: http
 7 resourceSpecifier: //www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 8 host: www.cnblogs.com
 9 port: 80
10 user: (null)
11 password: (null)
12 path: /huangjianwu/archive/2015/06.html
13 fragment: (null)
14 parameterString: (null)
15 query: author=KenmuHuang黄&page=1#a=1
16 relativePath: /huangjianwu/archive/2015/06.html
17 pathComponents: (
18     "/",
19     huangjianwu,
20     archive,
21     2015,
22     "06.html"
23 )