Java.net.URL Study Summary

Tag:java   url    Learning summary    

string host =  "www.java2s.com"; string file =  "/index.html"; string[] schemes = {"http",  "https",  "ftp",  "mailto",  "telnet",  "file" ,  "LDAP",  "gopher",         "jdbc",  "rmi",  "Jndi",   "Jar",  "Doc",  "NetDoc",  "NFS",  "verbatim",  "finger",  "daytime",          "Systemresource"};for  (int i = 0; i  < schemes.length; i++)  {    try {         url u = new url (Schemes[i], host, file);         system.out.println (schemes[i] +  " is supported/r/n");     } catch  (Exception ex)  {         System.out.println (schemes[i] +  "  is not supported/r/n ");     }} 

Result is

HTTP is Supported/r/nhttps are Supported/r/nftp is Supported/r/nmailto are supported/r/ntelnet is isn't supported/r/nfile is s Upported/r/nldap is not supported/r/ngopher are not supported/r/njdbc are not supported/r/nrmi are not Supported/r/njndi are N  OT Supported/r/njar is Supported/r/ndoc are not Supported/r/nnetdoc are Supported/r/nnfs are not supported/r/nverbatim are not Supported/r/nfinger are not supported/r/ndaytime are not supported/r/nsystemresource are not supported/r/n

Url.getcontent () Returns an object that can be used with. GetClass (). GetName () to get the actual name of this object, as in the following code: (here, when creating a URL object, the value passed to the constructor method must be This protocol begins with an exception to be thrown: Java.net.MalformedURLException:no protocol:www.baidu.com)

URL url = new URL ("http://www.baidu.com"); Object content = Url.getcontent (); System.out.println (Content.getclass (). GetName ());

The above code prints:

Sun.net.www.protocol.http.httpurlconnection$httpinputstream

You can use the OpenConnection method of the URL to return a URLConnection object that can be used to get the input stream.

URL url = new URL ("http://www.baidu.com"); URLConnection urlconnection = Url.openconnection (); InputStream InputStream = Urlconnection.getinputstream (); int C; while ((c = Inputstream.read ())! =-1) {System.out.println ((char) c);} Inputstream.close ();

Or get the input stream using the OpenStream method of the URL itself.

URL url = new URL ("http://www.baidu.com");//Opens a connection to this URL and returns a inputstream that is used to read from the connection. InputStream in = Url.openstream (); int C;while ((c = In.read ())! =-1) System.out.print (c); In.close ();

Java.net.URL Study Summary