자바의 정석 - 16.3 URL

16.3.1 URL(Uniform Resource Locator)

• 여러 서버들이 제공하는 자원에 접근할 수 있는 주소
• '프로토콜://호스트명:포트번호/경로명/파일명?쿼리스트링#참조'

프로토콜 : 통신규약(http)
호스트명 : 자원을 제공하는 서버이름
포트번호 : 통신에 사용되는 서버의 포트번호(80)
경로명 : 접근하려는 자원이 저장된 서버상의 위치
파일명 : 자원 이름
쿼리(query) : get, post, update, delete, ...
참조(anchor) : 참조

• method

URL(String spec)
URL(String protocol, String host, int port, String file)
URL(String protocol, String host, String file)
String getAuthority()
Object    getContent()
Object    getContent(Class[] classes)
int    getDefaultPort()
String    getFile()
String    getHost()
String    getPath()
int    getPort()
String    getProtocol()
String    getQuery()
String    getRef()
URLConnection    openConnection()
URLConnection    openConnection(Proxy proxy)
InputStream    openStream()
boolean    sameFile(URL other)
protected void    set(String protocol, String host, int port, String file, String ref)
protected void    set(String protocol, String host, int port, String authority, String userInfo, String path, String query, String ref)
String    toExternalForm()String    toExternalForm()
URI    toURI()

import java.net.*;

class NetworkEx2 {
    public static void main(String args[]) throws Exception {
        URL url = new URL("http://sleepyeyes.tistory.com/admin/entry/post/?type=post&returnURL=/manage/posts/");

        System.out.println("url.getAuthority() : "+ url.getAuthority());
        System.out.println("url.getDefaultPort() : "+ url.getDefaultPort());
        System.out.println("url.getPort() : "+ url.getPort());
        System.out.println("url.getFile() : "+ url.getFile());
        System.out.println("url.getHost() : "+ url.getHost());
        System.out.println("url.getPath() : "+ url.getPath());
        System.out.println("url.getProtocol() : "+ url.getProtocol());
        System.out.println("url.getQuery() : "+ url.getQuery());
        System.out.println("url.getRef() : "+ url.getRef());
        System.out.println("url.getUserInfo() : "+ url.getUserInfo());
        System.out.println("url.toURI() : "+ url.toURI());
    }
}

/*
url.getAuthority() : sleepyeyes.tistory.com
url.getDefaultPort() : 80
url.getPort() : -1
url.getFile() : /admin/entry/post/?type=post&returnURL=/manage/posts/
url.getHost() : sleepyeyes.tistory.com
url.getPath() : /admin/entry/post/
url.getProtocol() : http
url.getQuery() : type=post&returnURL=/manage/posts/
url.getRef() : null
url.getUserInfo() : null
url.toURI() : http://sleepyeyes.tistory.com/admin/entry/post/?type=post&returnURL=/manage/posts/
*/