JAVA學習筆記(五十八)- InetAddress類與URL

標籤：inetaddres   url   執行個體   

InetAddress類

/* * InetAddress類  */public class Test07 {    public static void main(String[] args) throws UnknownHostException {        //擷取原生InetAddress執行個體         System.out.println("*******擷取原生InetAddress執行個體**********");        InetAddress address1 = InetAddress.getLocalHost();        System.out.println("主機名稱："+address1.getHostName());        System.out.println("IP地址："+address1.getHostAddress());        byte[] bytes=address1.getAddress();        System.out.println("位元組數組形式的IP地址："+Arrays.toString(bytes));//超過127則為負數，加256        System.out.println(address1);        //根據主機名稱擷取指定主機的InetAddress執行個體        System.out.println("*******根據主機名稱擷取指定主機的InetAddress執行個體**********");        //InetAddress address2=InetAddress.getByName("HE67B6DJBOID2DA");        InetAddress address2=InetAddress.getByName("5.8.6.45");        System.out.println(address2.getHostName());        System.out.println(address2);        //根據位元組數組形式的IP地址來擷取InetAddress執行個體        System.out.println("**********根據位元組數組形式的IP地址來擷取InetAddress執行個體***********");        byte[] bytes2={(byte)192,(byte)168,6,8};        InetAddress address3=InetAddress.getByAddress(bytes2);        System.out.println(address3.getHostName());        System.out.println(address3);    }}

URL常用方法

/* * URL常用方法 */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("協議："+url.getProtocol());        System.out.println("主機："+url.getHost());        System.out.println("連接埠："+url.getPort());        System.out.println("檔案路徑："+url.getPath());        System.out.println("檔案名稱："+url.getFile());        System.out.println("相對路徑："+url.getRef());        System.out.println("查詢："+url.getQuery());    }}

使用URL讀取網頁內容

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;/* * 使用URL讀取網頁內容 */public class Test01 {    public static void main(String[] args) throws IOException {        test02();    }    //讀取網頁資源    public static void test01() throws IOException{        URL url = new URL("http://localhost:8080/webTest/");        InputStream is = url.openStream();// 擷取URL對象所表示的資源的輸入資料流        BufferedReader br = new BufferedReader(new InputStreamReader(is));// 將位元組輸入資料流轉換為字元輸入資料流        String str = br.readLine();        while (str != null) {            System.out.println(str);            str = br.readLine();        }        br.close();        is.close();    }    //讀取FTP上的檔案資源    public static void test02() throws IOException{        URL url=new URL("ftp://wbs14061:[email protected]/資料/exe2.txt");        System.out.println("協議："+url.getProtocol());        System.out.println("主機："+url.getHost());        System.out.println("連接埠："+url.getPort());        System.out.println("檔案路徑："+url.getPath());        System.out.println("檔案名稱："+url.getFile());        System.out.println("相對路徑："+url.getRef());        System.out.println("查詢："+url.getQuery());        InputStream is = url.openStream();// 擷取URL對象所表示的資源的輸入資料流        BufferedReader br = new BufferedReader(new InputStreamReader(is));// 將位元組輸入資料流轉換為字元輸入資料流        String str = br.readLine();        while (str != null) {            System.out.println(str);            str = br.readLine();        }        br.close();        is.close();    }}

JAVA學習筆記(五十八)- InetAddress類與URL