1.编写一个程序，查找指定域名www.taobao.com的所有可能的IP地址。
package kehouzuoye;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class AddressTest {
public static void main(String[] args) {
try {
System.out.println("-----淘宝的主服务器地址------");
InetAddress ia = InetAddress.getByName("www.taobao.com");
System.out.println(ia);
System.out.println("-----淘宝的所有服务器地址------");
InetAddress [] ia1 = InetAddress.getAllByName("www.taobao.com");
for (int i = 0; i < ia1.length; i++) {
System.out.println(ia1[i]);
}
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
2.模拟用户登陆，预设用户数据，提示登陆成功或不成功的原因。
package kehouzuoye2;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
/**
* 服务器类
* @author 段海锋
*
*/
public class ServerTest {
public static void main(String[] args) {
ServerSocket ss=null;
Socket sk=null;
InputStream is=null;
OutputStream os=null;
try {
ss = new ServerSocket(9000);
sk=ss.accept();
is=sk.getInputStream();
byte b []= new byte[1024];
int len=is.read(b);
if(new String(b,0,len).equals("用户1")) {
System.out.println("我是服务器,客户登陆的信息为:"+new String(b,0,len));
}else {
System.out.println("我是服务器,客户登陆的信息为:"+new String(b,0,len));
System.out.println("对不起，没有该用户，已通知客户端登陆失败！");
}
os=sk.getOutputStream();
String noni="登陆成功!";
os.write(noni.getBytes());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
os.close();
is.close();
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
package kehouzuoye2;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
/**
* 客户端类
* @author 段海锋
*
*/
public class OutlookTest {
public static void main(String[] args) {
OutputStream os=null;
Socket sk=null;
InputStream is=null;
try {
sk =new Socket("localhost", 9000);
os=sk.getOutputStream();
String use="用户1";
os.write(use.getBytes());
is=sk.getInputStream();
byte b [] = new byte[1024];
int len=is.read(b);
System.out.println("我是客户端，服务器的回应是:"+new String(b,0,len));
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
try {
is.close();
os.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}