如何ping一个IP地址 [英] How to ping an IP address

问题描述

我正在使用这部分代码在 java 中 ping 一个 ip 地址，但只有 ping localhost 是成功的，对于其他主机，程序说该主机无法访问.我禁用了我的防火墙，但仍然有这个问题

I am using this part of code to ping an ip address in java but only pinging localhost is successful and for the other hosts the program says the host is unreachable. I disabled my firewall but still having this problem

public static void main(String[] args) throws UnknownHostException, IOException {
    String ipAddress = "127.0.0.1";
    InetAddress inet = InetAddress.getByName(ipAddress);

    System.out.println("Sending Ping Request to " + ipAddress);
    System.out.println(inet.isReachable(5000) ? "Host is reachable" : "Host is NOT reachable");

    ipAddress = "173.194.32.38";
    inet = InetAddress.getByName(ipAddress);

    System.out.println("Sending Ping Request to " + ipAddress);
    System.out.println(inet.isReachable(5000) ? "Host is reachable" : "Host is NOT reachable");
}

输出为:

向 127.0.0.1 发送 Ping 请求
主机可达
发送 Ping 请求到 173.194.32.38
主机无法访问

Sending Ping Request to 127.0.0.1
Host is reachable
Sending Ping Request to 173.194.32.38
Host is NOT reachable

推荐答案

你不能简单地在 Java 中 ping，因为它依赖于 ICMP，遗憾的是 Java 不支持

You can not simply ping in Java as it relies on ICMP, which is sadly not supported in Java

http://mindprod.com/jgloss/ping.html

改用套接字

希望能帮到你

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