StringUtils

来源：互联网发布：淘宝助理怎么用啊编辑：程序博客网时间：2024/06/05 21:07
package com.zxwl.common.util;import java.net.InetAddress;import java.net.UnknownHostException;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import javax.servlet.http.HttpServletRequest;public class StringUtils{    public static boolean isEmpty(String str)    {        if (null == str || str.trim().length() == 0 || "".equals(str.trim()))        {            return true;        }                return false;    }        public static boolean isValue(String str)    {    return !isEmpty(str);    }        /**     * 日期加操作，返回计算后的日期     */    public static String addDate(String dateTime, int n)    {    SimpleDateFormat dd=new SimpleDateFormat("yyyy-MM-dd");     Date date = new Date();try {date = dd.parse(dateTime);} catch (ParseException e) {e.printStackTrace();}    Calendar calstart = Calendar.getInstance();    calstart.setTime(date);    calstart.add(Calendar.DAY_OF_MONTH, n);     return dd.format(calstart.getTime());    }        /**     * 处理拼接sql时注入单引号的问题     */    public static String inSql(String value) {if (null == value) {return "";} else {return value.replace("'", "''");}}        /**     * object转换string     * @param value     * @return     */    public static String object2String(Object value)    { if(null==value){ return null; }else{ return value.toString(); }  }        /**     * 获取客户端的真实IP地址     * @param request     * @return     */    public static String getIpAddr(HttpServletRequest request) {   String ipAddress = null;  ipAddress = request.getHeader("x-forwarded-for");    if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {    ipAddress = request.getHeader("Proxy-Client-IP");    }   if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {       ipAddress = request.getHeader("WL-Proxy-Client-IP");    }   if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {    ipAddress = request.getRemoteAddr();    if(ipAddress.equals("0:0:0:0:0:0:0:1"))    {    ipAddress = "127.0.0.1";    }    if(ipAddress.equals("127.0.0.1"))    {        //根据网卡取本机配置的IP        InetAddress inet=null;        try     {        inet = InetAddress.getLocalHost();       }catch (UnknownHostException e)     {        e.printStackTrace();       }       ipAddress= inet.getHostAddress();       //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割        if(ipAddress!=null && ipAddress.length()>15)    { //"***.***.***.***".length() = 15        if(ipAddress.indexOf(",")>0)    {        ipAddress = ipAddress.substring(0,ipAddress.indexOf(","));            }       }       }}return ipAddress; }        /**     * 日期加操作，返回计算后的日期     */    public static Date formatDate(String dateTime)    {    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");     Date startTime = new Date();    try{startTime = sdf.parse(dateTime);}catch (ParseException e){e.printStackTrace();}        return startTime;    }        /**     * xml特殊字符串处理     * @param str     * @return     */    public static String replaceSpecialChar(String str){    if(str==null || "".equals(str)){    return "";    }    StringBuilder sb = new StringBuilder();for (int i = 0; i < str.length(); i++){char c = str.toCharArray()[i]; // str转换为字节数组switch (c){case '<' :sb.append("<");break;case '>' :sb.append(">");break;case '&' :sb.append("&");break;case '"' :sb.append(""");break;case '\'' :sb.append("'");break;default :sb.append(c);break;}}return sb.toString();    }        /**     * 是否数字     */    public static boolean isNum(String value) {try{Integer.parseInt(value);return true;}catch(Exception e){return false;}}}
0 0