android Traceroute功能代码完整实现

Traceroute（跟踪路由）是一种网络工具，它通过向目标主机发送一系列的数据包，来确定从本地主机到目标主机的网络路径。在Android平台上，我们可以通过执行特定的shell命令来实现Traceroute功能。

下面是一个完整的Traceroute实现代码，需要注意的是，该代码需要在具有Root权限的设备上运行：

public class Traceroute {
    private static final String TAG = Traceroute.class.getSimpleName();
    private static final int MAX_TTL = 30;
    private static final int MAX_TIMEOUT = 3000;
    private static final String COMMAND = "ping -c 1 -t %d -W %d %s";
    private static final String REGEX_TIME = "time=(\\d+\\.?\\d*)";
    private static final String REGEX_IP = "\\((\\d+\\.\\d+\\.\\d+\\.\\d+)\\)";
    private static final String REGEX_TTL = "ttl=(\\d+)";
    private static final String REGEX_TIMEOUT = "100% packet loss";

    public static List<String> traceRoute(String ipAddress) {
        List<String> result = new ArrayList<>();
        for (int ttl = 1; ttl <= MAX_TTL; ttl++) {
            String command = String.format(Locale.US, COMMAND, ttl, MAX_TIMEOUT, ipAddress);
            Process process = null;
            try {
                process = Runtime.getRuntime().exec(command);
            } catch (IOException e) {
                Log.e(TAG, "Error executing command", e);
                return result;
            }

            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
            String line;
            String ip = null;
            float time = -1;
            try {
                while ((line = reader.readLine()) != null) {
                    Log.d(TAG, "Line: " + line);
                    Matcher matcher = Pattern.compile(REGEX_IP).matcher(line);
                    if (matcher.find()) {
                        ip = matcher.group(1);
                    }

                    matcher = Pattern.compile(REGEX_TIME).matcher(line);
                    if (matcher.find()) {
                        time = Float.parseFloat(matcher.group(1));
                    }

                    matcher = Pattern.compile(REGEX_TTL).matcher(line);
                    if (matcher.find()) {
                        int hop = Integer.parseInt(matcher.group(1));
                        String hopString = String.format(Locale.US, "%d   %s (%s)  %.2fms", hop, ip, ipAddress, time);
                        Log.d(TAG, "Hop: " + hopString);
                        result.add(hopString);
                        break;
                    }

                    matcher = Pattern.compile(REGEX_TIMEOUT).matcher(line);
                    if (matcher.find()) {
                        String timeoutString = String.format(Locale.US, "%d   *", ttl);
                        Log.d(TAG, "Timeout: " + timeoutString);
                        result.add(timeoutString);
                        break;
                    }
                }
            } catch (IOException e) {
                Log.e(TAG, "Error reading output", e);
            } finally {
                try {
                    reader.close();
                } catch (IOException e) {
                    Log.e(TAG, "Error closing reader", e);
                }
            }
        }
        return result;
    }
}

该代码使用ping命令来向目标主机发送数据包，并解析ping命令的输出，从而获取每一跳的IP地址、延迟等信息，从而实现Traceroute功能。在执行ping命令时，我们可以设置TTL值和超时时间，以便控制ping命令的执行时间和跳数。在解析ping命令的输出时，我们使用正则表达式来匹配需要的信息，并返回结果。

需要注意的是，该代码需要在具有Root权限的设备上运行，因为ping命令需要访问底层网络协议栈。