java获取ip地址

/**
	 * 获取公网ip
	 * return String
	 * */
	private static String getMyIP() throws IOException {
		InputStream ins = null;
		try {
			URL url = new URL("http://www.ip138.com/ip2city.asp");
			URLConnection con = url.openConnection();
			ins = con.getInputStream();
			InputStreamReader isReader = new InputStreamReader(ins, "GB2312");
			BufferedReader bReader = new BufferedReader(isReader);
			StringBuffer webContent = new StringBuffer();
			String str = null;
			while ((str = bReader.readLine()) != null) {
				webContent.append(str);
			}
			int start = webContent.indexOf("[") + 1;
			int end = webContent.indexOf("]");
			return webContent.substring(start, end);
		} finally {
			if (ins != null) {
				ins.close();
			}
		}
	}

private static String getMyIPLocal() throws IOException {
		InetAddress ia = InetAddress.getLocalHost();
		return ia.getHostAddress();
	}

public static void main(String[] args) {
		try {
			long beginTime = System.currentTimeMillis();
			System.out.println("公网ip："+getMyIP());
			System.out.println("局域网ip："+getMyIPLocal());
			long endTime = System.currentTimeMillis();
			System.out.println(endTime-beginTime);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}