IM-server-new/broker/src/main/java/win/liyufan/im/Utility.java

/*
 * This file is part of the Wildfire Chat package.
 * (c) Heavyrain2012 <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

package win.liyufan.im;

import org.slf4j.Logger;

import java.net.*;
import java.util.Enumeration;

public class Utility {
    public static InetAddress getLocalAddress(){
        try {
            Enumeration<NetworkInterface> b = NetworkInterface.getNetworkInterfaces();
            while( b.hasMoreElements()){
                for ( InterfaceAddress f : b.nextElement().getInterfaceAddresses())
                    if ( f.getAddress().isSiteLocalAddress())
                        return f.getAddress();
            }
        } catch (SocketException e) {
            e.printStackTrace();
        }
        return null;
    }

    public static void printExecption(Logger LOG, Exception e) {
        String message = "";

        for(StackTraceElement stackTraceElement : e.getStackTrace()) {
            message = message + System.lineSeparator() + stackTraceElement.toString();
        }
        LOG.error("Exception: {}", e.getMessage());
        LOG.error(message);
    }

    public static String getMacAddress() throws UnknownHostException,
        SocketException {
        InetAddress ipAddress = InetAddress.getLocalHost();
        NetworkInterface networkInterface = NetworkInterface
            .getByInetAddress(ipAddress);
        byte[] macAddressBytes = networkInterface.getHardwareAddress();
        StringBuilder macAddressBuilder = new StringBuilder();

        for (int macAddressByteIndex = 0; macAddressByteIndex < macAddressBytes.length; macAddressByteIndex++) {
            String macAddressHexByte = String.format("%02X",
                macAddressBytes[macAddressByteIndex]);
            macAddressBuilder.append(macAddressHexByte);

            if (macAddressByteIndex != macAddressBytes.length - 1)
            {
                macAddressBuilder.append(":");
            }
        }

        return macAddressBuilder.toString();
    }

    /**
     * 格式化
     *
     * @param jsonStr
     * @return
     * @author lizhgb
     * @Date 2015-10-14 下午1:17:35
     * @Modified 2017-04-28 下午8:55:35
     */
    public static String formatJson(String jsonStr) {
        if (null == jsonStr || "".equals(jsonStr))
            return "";
        StringBuilder sb = new StringBuilder();
        char last = '\0';
        char current = '\0';
        int indent = 0;
        boolean isInQuotationMarks = false;
        for (int i = 0; i < jsonStr.length(); i++) {
            last = current;
            current = jsonStr.charAt(i);
            switch (current) {
                case '"':
                    if (last != '\\'){
                        isInQuotationMarks = !isInQuotationMarks;
                    }
                    sb.append(current);
                    break;
                case '{':
                case '[':
                    sb.append(current);
                    if (!isInQuotationMarks) {
                        sb.append('\n');
                        indent++;
                        addIndentBlank(sb, indent);
                    }
                    break;
                case '}':
                case ']':
                    if (!isInQuotationMarks) {
                        sb.append('\n');
                        indent--;
                        addIndentBlank(sb, indent);
                    }
                    sb.append(current);
                    break;
                case ',':
                    sb.append(current);
                    if (last != '\\' && !isInQuotationMarks) {
                        sb.append('\n');
                        addIndentBlank(sb, indent);
                    }
                    break;
                default:
                    sb.append(current);
            }
        }

        return sb.toString();
    }

    /**
     * 添加space
     *
     * @param sb
     * @param indent
     * @author lizhgb
     * @Date 2015-10-14 上午10:38:04
     */
    private static void addIndentBlank(StringBuilder sb, int indent) {
        for (int i = 0; i < indent; i++) {
            sb.append('\t');
        }
    }
}