java net 学习（二）－－URL

new URL(“http”,”www.google.com.hk”,”/map.html”);

URL解析方法：

getProtocol

Returns theprotocol identifier component of the URL.

getAuthority

Returns theauthority component of the URL.

getHost

Returns the hostname component of the URL.

getPort

Returns the portnumber component of the URL. The getPort method returns an integer that is theport number. If the port is not set, getPort returns -1.

getPath

Returns the pathcomponent of this URL.

getQuery

Returns the querycomponent of this URL.

getFile

Returns thefilename component of the URL. The getFile method returns the same as getPath,plus the concatenation of the value of getQuery, if any.

getRef

Returns thereference component of the URL.

public class Reverse {

??? public staticvoid main(String[] args) throws Exception {

?

??????? if(args.length != 2) {

??????? ??? System.err.println("Usage:? java Reverse " +

??????????????????????????????"http://<location of your servlet/script>" +

???????????????? ??????????????" string_to_reverse");

??????? ??? System.exit(1);

??????? }

?

??????? StringstringToReverse = URLEncoder.encode(args[1], "UTF-8");

?

??????? URL url =new URL(args[0]);

??????? URLConnectionconnection = url.openConnection();

??????? connection.setDoOutput(true);

?

??????? OutputStreamWriterout = new OutputStreamWriter(

?????????????????????????????connection.getOutputStream());

??????? out.write("string="+ stringToReverse);

??????? out.close();

?

??????? BufferedReaderin = new BufferedReader(

?????????????????????????????? newInputStreamReader(

?????????????????????????????? connection.getInputStream()));

??????????????????????????????

??????? StringdecodedString;

?

??????? while((decodedString = in.readLine()) != null) {

??????? ??? System.out.println(decodedString);

??????? }

??????? in.close();

??? }

}