Java中StringHelp

import java.util.Collection;
import java.util.Map;
import java.util.UUID;

public class StringHelper {

    public static final String     EMPTY="";

    public StringHelper(){}

    /**
     * 判断字符串是否为NULL或空值
     * @param str
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Boolean IsEmptyOrNull(Object obj)
    {
        if (obj == null)
            return true;
        if ("".equals(obj))
            return true;
        if (obj instanceof String) {
            if (((String) obj).length() == 0) {
                return true;
            }
        } else if (obj instanceof Collection) {
            if (((Collection) obj).size() == 0) {
                return true;
            }
        } else if (obj instanceof Map) {
            if (((Map) obj).size() == 0) {
                return true;
            }
        }
        return false;
    }

    /**
     * NULL转String
     * @param obj
     * @return
     */
    public static String TranString(Object obj)
    {
        if (obj == null)
            return "";

        return obj.toString();
    }

    /**
     * NULL转String
     * @param obj
     * @param defaultval 默认值
     * @return
     */
    public static String TranString(Object obj, String defaultval)
    {
        if (obj == null)
            return defaultval;

        return obj.toString();
    }

    /**
     * 模糊查询%_通配符转换
     * @param str
     * @return
     */
    public static String TranSeachString(Object obj)
    {
        if (obj == null)
            return "";
        String result = obj.toString();

        return result.replace("\\", "\\\\").replace("_", "\\_").replace("%", "\\%");

        /*if (result.startsWith("%") || result.startsWith("_")) {
            result = "\\" + result;
        }

        if (!"\\%".equals(result) && !"\\_".equals(result) && result.length() >= 2 && (result.endsWith("%") || result.endsWith("_"))) {
            String tmp1 = result.substring(result.length() - 1, result.length());
            String tmp2 = result.substring(0, result.length() - 1);
            result = tmp2 + "\\" + tmp1;
        }
        return result;*/
    }

    /**
     * 获取GUID
     * @return
     */
    public static String GetGUID()
    {
        return UUID.randomUUID().toString().replace("-", "");
    }

}