Java Learning Note (58)-inetaddress class and URL

InetAddress class

/ * * InetAddress class * /public class Test07 {public static void main (string[] args) throws Unknownhostexception {//Get native InetAddress instance System. out. println("******* Gets the inetaddress instance of this machine **********");InetAddress Address1 = inetaddress. Getlocalhost();System. out. println("host name:"+address1. GetHostName());System. out. println("IP address:"+address1. Gethostaddress());Byte[] Bytes=address1. GetAddress();System. out. println("IP address as a byte array:"+arrays. toString(bytes));//More than 127 is a negative number, plusSystem. out. println(ADDRESS1);Gets the InetAddress instance System for the specified host based on the host name. out. println("******* Gets the InetAddress instance of the specified host based on the hostname **********");InetAddress address2=inetaddress. Getbyname("He67b6djboid2da");InetAddress address2=inetaddress. Getbyname("5.8.6.45");System. out. println(Address2. GetHostName());System. out. println(ADDRESS2);Gets the InetAddress instance System based on an IP address in the form of a byte array. out. println("********** Gets an InetAddress instance based on an IP address in the form of a byte array ***********");Byte[] bytes2={(byte)192, (Byte)168,6,8};InetAddress address3=inetaddress. Getbyaddress(Bytes2);System. out. println(ADDRESS3. GetHostName());System. out. println(ADDRESS3);}}

URL Common methods

/ * * URL Common method */public class Test08 {public static void main (string[] args) throws malformedurlexception {URL baidu=new url ("Http://www.baidu.com");URL url=new url (Baidu,"/index.html?username=tom&password=123#test");System. out. println("agreement:"+url. Getprotocol());System. out. println("Host:"+url. GetHost());System. out. println("Port:"+url. Getport());System. out. println("File path:"+url. GetPath());System. out. println("file name:"+url. GetFile());System. out. println("relative path:"+url. GetRef());System. out. println("Query:"+url. Getquery());}}

Using URLs to read Web page content

Import Java.io.bufferedinputstream;import Java.io.bufferedreader;import Java.io.ioexception;import Java.io.inputstream;import Java.io.inputstreamreader;import Java.net.malformedurlexception;import Java.net.URL;/ * * Use URL to read Web content */ Public classTest01 { Public Static void Main(string[] args) throws IOException {test02 (); }//Read Web resources     Public Static void test01() throws ioexception{url url =NewURL ("http://localhost:8080/webTest/"); InputStream is= Url.openstream ();//Gets the input stream of the resource represented by the URL objectBufferedReader br =NewBufferedReader (NewInputStreamReader ( is));//Convert byte input stream to character input streamString str = br.readline (); while(str! =NULL) {System. out. println (str);        str = Br.readline (); } br.close (); is. Close (); }//Read file resources on FTP     Public Static void test02() throws ioexception{URL url=NewURL ("Ftp://wbs14061:[email protected]/information/exe2.txt"); System. out. println ("agreement:"+url.getprotocol ()); System. out. println ("Host:"+url.gethost ()); System. out. println ("Port:"+url.getport ()); System. out. println ("File path:"+url.getpath ()); System. out. println ("file name:"+url.getfile ()); System. out. println ("relative path:"+url.getref ()); System. out. println ("Query:"+url.getquery ()); InputStream is= Url.openstream ();//Gets the input stream of the resource represented by the URL objectBufferedReader br =NewBufferedReader (NewInputStreamReader ( is));//Convert byte input stream to character input streamString str = br.readline (); while(str! =NULL) {System. out. println (str);        str = Br.readline (); } br.close (); is. Close (); }}

Java Learning Note (58)-inetaddress class and URL