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public class ChangeIp extends HttpServlet {
	protected void service(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
		Process proc = Runtime.getRuntime().exec("/bin/bash", null, new File("/bin"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(proc.getOutputStream())), true);
		BufferedReader in = new BufferedReader(new InputStreamReader(proc.getInputStream()));
		out.println("route del default gw 192.168.5.1");
		out.println("ifconfig wlan0 192.168.5.106 netmask 255.255.255.0");
		out.println("route add default gw 192.168.5.1 dev wlan0");
		out.println("/home/sfeer/tomcat/bin/catalina.sh stop");
		try {
			Thread.sleep(2000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		out.println("/home/sfeer/tomcat/bin/catalina.sh start");
		String line;
		while ((line = in.readLine()) != null)
			System.out.println(line);
		try {
			proc.waitFor();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		proc.destroy();
	}
}

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需要注意的几个地方：

wlan0为测试的无线网卡，一般环境为eth0或是eth1有线网卡

修改后建议重启TOMCAT，IP调整后建议执行应用的初始化和销毁程序片

重启TOMCAT可能需要一定时间，调整睡眠时间

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