1、java中InetAddress的应用
//获取本机的InetAddress实例
InetAddress address = InetAddress.getLocalHost();
System.out.println("计算机名:" + address.getHostName());
System.out.println("IP地址:" + address.getHostAddress());
//获取字节数组形式的IP
byte[] bytes = address.getAddress();
System.out.println("字节数组形式的IP地址:" + Arrays.toString(bytes));
//直接输出InetAddress对象
System.out.println(address);
计算机名:MSI
IP地址:192.168.232.1
字节数组形式的IP地址:[-64, -88, -24, 1]
MSI/192.168.232.1
//根据主机名获取InetAddress实例
InetAddress address2 = InetAddress.getByName("MSI");
System.out.println("计算机名:" + address2.getHostName());
System.out.println("IP地址:" + address2.getHostAddress());
计算机名:MSI
IP地址:192.168.232.1
//根据主机ip地址获取InetAddress实例
InetAddress address3 = InetAddress.getByName("192.168.232.1");
System.out.println("计算机名:" + address3.getHostName());
System.out.println("IP地址:" + address3.getHostAddress());
计算机名:MSI
IP地址:192.168.232.1
2.java中URL的应用
//创建一个URL实例
URL ip = new URL("http://www.cctv.com");
//?后面表示参数,#后面表示锚点
URL url = new URL(ip, "/index.html?uesrname=tom#test");
System.out.println("协议:" + url.getProtocol());
System.out.println("主机:" + url.getHost());
//如果未指定端口号,则使用默认的端口号,此时getPort()方法返回值为-1
System.out.println("端口:" + url.getPort());
System.out.println("文件路径:" + url.getPath());
System.out.println("文件名:" + url.getFile());
System.out.println("相对路径:" + url.getRef());
System.out.println("查询字符串:" + url.getQuery());
协议:http
主机:www.cctv.com
端口:-1
文件路径:/index.html
文件名:/index.html?uesrname=tom
相对路径:test
查询字符串:uesrname=tom
public class Ip2test03 {
public static void main(String[] args) {
/*
* 使用URL读取页面内容
*/
try {
//创建一个URL实例
URL url = new URL("http://www.baidu.com");
//通过URL的openStream()方法获取URL对象所表示的资源的字节输入流
InputStream is = url.openStream();
//将字节输入流转换为字符输入流
InputStreamReader isr = new InputStreamReader(is, "utf-8");
//为字符输入流添加缓冲
BufferedReader br = new BufferedReader(isr);
String data = br.readLine();//读取数据
//循环读取数据
while(data!=null) {
System.out.println(data);//输出数据
data = br.readLine();//读取下一行
}
br.close();
isr.close();
is.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}