Objective-C 语法之 NSURL

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

 #import <Foundation/Foundation.h>

 void testURL(NSString *strUrl) {
     strUrl = [strUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //对字符串进行编码

     NSURL *url = [NSURL URLWithString:strUrl];
     NSMutableString *mStrInfo = [[NSMutableString alloc] initWithString:@"URL相关信息如下：\n"];
     [mStrInfo appendFormat:@"absoluteString: %@\n", [url absoluteString]];
     [mStrInfo appendFormat:@"relativeString: %@\n", [url relativeString]];
     [mStrInfo appendFormat:@"baseURL: %@\n", [url baseURL]];
     [mStrInfo appendFormat:@"absoluteURL: %@\n", [url absoluteURL]];
     [mStrInfo appendFormat:@"scheme: %@\n", [url scheme]];
     [mStrInfo appendFormat:@"resourceSpecifier: %@\n", [url resourceSpecifier]];
     [mStrInfo appendFormat:@"host: %@\n", [url host]];
     [mStrInfo appendFormat:@"port: %@\n", [url port]];
     [mStrInfo appendFormat:@"user: %@\n", [url user]];
     [mStrInfo appendFormat:@"password: %@\n", [url password]];
     [mStrInfo appendFormat:@"path: %@\n", [url path]];
     [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
     [mStrInfo appendFormat:@"parameterString: %@\n", [url parameterString]];
     [mStrInfo appendFormat:@"query: %@\n", [url query]];
     [mStrInfo appendFormat:@"relativePath: %@\n", [url relativePath]]; //如果baseURL是nil，relativePath就跟path一样
     [mStrInfo appendFormat:@"pathComponents: %@\n", [url pathComponents]];

     NSLog(@"%@", [mStrInfo stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]); //对字符串进行解码
 }

 int main(int argc, const char * argv[]) {
     @autoreleasepool {
         NSString *strUrl = @"http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1";
         testURL(strUrl);
     }
     return ;
 }

结果：

 -- ::29.496 OCNSURL[:] URL相关信息如下：
 absoluteString: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 relativeString: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 baseURL: (null)
 absoluteURL: http://www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 scheme: http
 resourceSpecifier: //www.cnblogs.com:80/huangjianwu/archive/2015/06.html?author=KenmuHuang黄&page=1#a=1
 host: www.cnblogs.com
 port:
 user: (null)
 password: (null)
 path: /huangjianwu/archive//.html
 fragment: (null)
 parameterString: (null)
 query: author=KenmuHuang黄&page=#a=
 relativePath: /huangjianwu/archive//.html
 pathComponents: (
     "/",
     huangjianwu,
     archive,
     ,
     "06.html"
 )