请指点一下有关 IP解析的代码

[zh89220]

JFrame newf = new JFrame();
newf.setSize(200,100);
newf.setVisible(true);
JTextArea text1 = new JTextArea(1,10);
JTextArea text2 = new JTextArea(1,10);
JButton newb = new JButton("确定");
newf.add(text1,BorderLayout.NORTH);
newf.add(newb,BorderLayout.CENTER);
newf.add(text2,BorderLayout.SOUTH);

InetAddress address1 = null;
InetAddress address2 = null;
try
{
address1 = InetAddress.getByName(text1.getText().toString());
System.out.println(address1.getHostName());//输出主机名
address2 = InetAddress.getByName(text2.getText().toString());
System.out.println(address2);//输出指定机器的IP地址

}
catch (UnknownHostException b)
{
System.err.println(b);//显示错误信息
}



谁能帮我看下这段代码。功能是：获取输入的主机名或IP地址， 输出对应IP地址或主机名。

[茫茫大海]

看什么，你发帖的目的是什么呢？

[诚朴勇毅]

我觉得应该把newf.setVisible(true);放在JTextArea 后面。
查JDK文档吧。

[茫茫大海]

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.InetAddress;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Main extends JFrame implements ActionListener {

	private JTextArea name;
	private JTextArea ip;
	private JButton button;
	private JTextArea result;

	public Main() {
		name = new JTextArea(1, 10);
		ip = new JTextArea(1, 10);
		button = new JButton("确定");
		button.addActionListener(this);
		JPanel panel = new JPanel();
		panel.setLayout(new FlowLayout());
		panel.add(new JLabel("主机名:"));
		panel.add(name);
		panel.add(new JLabel("IP地址:"));
		panel.add(ip);
		panel.add(button);
		this.add(panel, BorderLayout.NORTH);

		result = new JTextArea(15, 20);
		result.setEditable(false);
		JScrollPane jsp = new JScrollPane(result);//给显示结果的JTextArea加上滚动条
		this.add(jsp);

		this.setTitle("地址解析");
		this.setSize(600, 400);
		this.setVisible(true);
		this.setResizable(false);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	/**
	 * 处理确定按钮单击的事件
	 */
	public void actionPerformed(ActionEvent e) {
		if (e.getActionCommand().equals("确定")) {
			if (name.getText().trim().equals("")) {
				JOptionPane.showMessageDialog(this, "主机名不能为空！");
				return;
			}
			if (ip.getText().trim().equals("")) {
				JOptionPane.showMessageDialog(this, "IP地址不能为空！");
				return;
			} else if(!ip.getText().trim().matches("((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]\\d|[1-9])")) {//验证IP地址格式是否正确
				JOptionPane.showMessageDialog(this, "IP地址格式错误，请检查后重新输入！");
				return;
			}

			InetAddress address1 = null;
			InetAddress address2 = null;
			try {
				address1 = InetAddress.getByName(name.getText().trim());
				String message = "主机名:" + name.getText() + " 对应的IP地址为:" + address1.getHostAddress();
				if(!result.getText().equals("")) 
					message = result.getText() + "\n" + message;
				result.setText(message);
				address2 = InetAddress.getByName(ip.getText().trim());
				message = "IP地址:" + ip.getText() + " 对应的主机名为:" + address2.getHostName();
				result.setText(result.getText() + "\n" + message);
			} catch (UnknownHostException b) {
				JOptionPane.showMessageDialog(this, "操作过程中出现了错误，请检查输入是否正确！");
				return;
			}

		}
	}

	public static void main(String[] args) {
		new Main();
	}
}

没看明白楼主的代码，根据楼主的大概意思写了上面的程序，楼主可以看看！