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我一般是编程新手，必须为我的课程用 Java 创建一个 IP 扫描仪，而我目前遇到了障碍。在朋友的帮助下，我能够从 jFrame 中获取 IP 地址并将其转换为 IP 号码。从那里我将它传递到一个公共字符串中，该字符串扫描地址。它目前可以毫无问题地遍历地址，但是我不知道如何将结果从 try 块中取出以显示在文本块中，就像您期望 IP 扫描程序那样。这是我的代码：

private void jBtnPSScanActionPerformed(java.awt.event.ActionEvent evt) {                                           
        // TODO add your handling code here:


        //Get text from text boxes
        String pingSSIP1 = jTxtPSSIPOne.getText();
        String pingSSIP2 = jTxtPSSIPTwo.getText();
        String pingSSIP3 = jTxtPSSIPThree.getText();
        String pingSSIP4 = jTxtPSSIPFour.getText();
        String pingSEIP1 = jTxtPSEIPOne.getText();
        String pingSEIP2 = jTxtPSEIPTwo.getText();
        String pingSEIP3 = jTxtPSEIPThree.getText();
        String pingSEIP4 = jTxtPSEIPFour.getText();

        //Convert text into IP Numbers      
        long ipNumberS = 0;
        ipNumberS = ipNumberS + (Long.parseLong(pingSSIP1)*256*256*256) ;
        ipNumberS = ipNumberS + (Long.parseLong(pingSSIP2)*256*256) ;
        ipNumberS = ipNumberS + (Long.parseLong(pingSSIP3)*256) ;
        ipNumberS = ipNumberS + (Long.parseLong(pingSSIP4)) ;
        System.out.println (ipNumberS);
        long ipNumberE = 0;
        ipNumberE = ipNumberE + (Long.parseLong(pingSEIP1)*256*256*256) ;
        ipNumberE = ipNumberE + (Long.parseLong(pingSEIP2)*256*256) ;
        ipNumberE = ipNumberE + (Long.parseLong(pingSEIP3)*256) ;
        ipNumberE = ipNumberE + (Long.parseLong(pingSEIP4)) ;
        System.out.println (ipNumberE);


        String startAddress = Long.toString(ipNumberS);
        String endAddress = Long.toString(ipNumberE);

        String returnIP = pingSweep(startAddress, endAddress, ipNumberS, ipNumberE);

        System.out.println(returnIP);

        //Update jTxtBlock with returnIP and result

    }

和：

public String pingSweep (String startAddress, String endAddress, long ipNumberS, long ipNumberE) 
{
    String ip = "";


    for (long currIP = ipNumberS; currIP < ipNumberE; currIP++)
    {
        try {
            ip = Long.toString(currIP) ;
            System.out.println(currIP);
            InetAddress host = InetAddress.getByName(ip);
            System.out.println("Host Reachable? " + host.isReachable(4000));
            System.out.println(currIP);
            System.out.println(ip);
            ip = ip + " " + currIP + " " + host.isReachable(4000);
        }
        catch (UnknownHostException ex) {
            System.err.println(ex);
            break;
        }
        catch (IOException ex) {
            System.err.println(ex);
            break;
        }

    }
    return ip;
}

提前致谢！

马修

4

1 回答 1

1

所以这就是你所拥有的。要在 JFrame 上显示的字符串？是吗 ？

您可以在 JFrame 上添加标签并将字符串传递给该标签

详情请参阅如何标注

PS：使用标签只是显示只读文本的建议，如果你想使用 inputText、textArea 或任何你喜欢和要求的东西

更新

OP 确认他正在使用 TextArea

提示：当您的 ping 收到响应时，jTextArea.append(host.isRechable) 方法将新值附加到 jTextArea。

于 2012-11-22T11:49:12.750 回答