Java URI getHost()方法及示例

getHost() 函数是URL类的一部分。getHost()函数返回一个指定的URL的主机。URL的Host部分是该URL的主机名。主机的格式符合RFC 2732的规定。

函数签名

public String getHost()

语法

url.getHost()

参数 ：该函数不需要任何参数。

返回类型 ：该函数返回 字符串 类型

下面的程序说明了getHost()函数的使用。

例1 :

// Java program to show the use// of the function getHost()  import java.net.*;  class GFG {    public static void main(String args[])    {        // url  object        URL url = null;          try {              // create a URL            url                = new URL("https:// www.geeksforgeeks.org");              // get the Host            String Host = url.getHost();              // display the URL            System.out.println("URL = " + url);              // display the Host            System.out.println("Host = " + Host);        }          // if any error occurs        catch (Exception e) {              // display the error            System.out.println(e);        }    }}

输出:

URL = https:// www.geeksforgeeks.orgHost =  www.geeksforgeeks.org

例2 :

// Java program to show the// use of the function getHost()  import java.net.*;  class GFG {    public static void main(String args[])    {        // url  object        URL url = null;          try {            // create a URL            url                = new URL(                    "https:// www.geeksforgeeks.org:80/url-samefile-method-in-java-with-examples/");              // get the Authority            String authority                = url.getAuthority();              // get the Host            String host = url.getHost();              // display the URL            System.out.println("URL = " + url);              // display the Host            System.out.println("Authority = "                               + authority);              // display the Host            System.out.println("Host = " + host);        }        // if any error occurs        catch (Exception e) {              // display the error            System.out.println(e);        }    }}

输出:

URL = https:// www.geeksforgeeks.org:80/url-samefile-method-in-java-with-examples/Authority =  www.geeksforgeeks.org:80Host =  www.geeksforgeeks.org

例3： 如果我们创建一个没有主机名的URL，并使用getHost()函数询问主机，该函数返回空白的String。

// Java program to show the// use of the function getHost()  import java.net.*;  class GFG {    public static void main(String args[])    {        // url  object        URL url = null;          try {            // create a URL            url = new URL("https://");              // get the Host            String Host = url.getHost();              // display the URL            System.out.println("URL = " + url);              // display the Host            System.out.println("Host = " + Host);        }          // if any error occurs        catch (Exception e) {              // display the error            System.out.println(e);        }    }}

输出:

URL = https:Host =