实用工具类（持续更新）

Java脱敏工具

private static final int SIZE = 6;
    private static final String SYMBOL = "*";
    /**
     * 通用脱敏方法
     * @param value
     * @return
     */
    public static String commonDisplay(String value) {
        if (null == value || "".equals(value)) {
            return value;
        }
        int len = value.length();
        int pamaone = len / 2;
        int pamatwo = pamaone - 1;
        int pamathree = len % 2;
        StringBuilder stringBuilder = new StringBuilder();
        if (len <= 2) {
            if (pamathree == 1) {
                return SYMBOL;
            }
            stringBuilder.append(SYMBOL);
            stringBuilder.append(value.charAt(len - 1));
        } else {
            if (pamatwo <= 0) {
                stringBuilder.append(value.substring(0, 1));
                stringBuilder.append(SYMBOL);
                stringBuilder.append(value.substring(len - 1, len));

            } else if (pamatwo >= SIZE / 2 && SIZE + 1 != len) {
                int pamafive = (len - SIZE) / 2;
                stringBuilder.append(value.substring(0, pamafive));
                for (int i = 0; i < SIZE; i++) {
                    stringBuilder.append(SYMBOL);
                }
                if ((pamathree == 0 && SIZE / 2 == 0) || (pamathree != 0 && SIZE % 2 != 0)) {
                    stringBuilder.append(value.substring(len - pamafive, len));
                } else {
                    stringBuilder.append(value.substring(len - (pamafive + 1), len));
                }
            } else {
                int pamafour = len - 2;
                stringBuilder.append(value.substring(0, 1));
                for (int i = 0; i < pamafour; i++) {
                    stringBuilder.append(SYMBOL);
                }
                stringBuilder.append(value.substring(len - 1, len));
            }
        }
        return stringBuilder.toString();
    }

 XML工具

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
import java.io.InputStream;

public class XmlUtil {
    
    /**
     * 
     * @Description: xml字符串转换为对象
     * @param inputXml
     * @param type
     * @return
     * @throws Exception
     */
    public static Object xml2Object(String inputXml, Class<?> type) throws Exception {
        if (null == inputXml || "".equals(inputXml)) {
            return null;
        }
        XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
        xstream.alias("xml", type);
        return xstream.fromXML(inputXml);
    }
    
    /**
     * 
     * @Description: 从inputStream中读取对象
     * @param inputStream
     * @param type
     * @return
     * @throws Exception
     */
    public static Object xml2Object(InputStream inputStream, Class<?> type) throws Exception {
        if (null == inputStream) {
            return null;
        }
        XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
        xstream.alias("xml", type);
        return xstream.fromXML(inputStream, type);
    }

    /**
     * 
     * @Description: 对象转换为xml字符串
     * @param ro
     * @param types
     * @return
     * @throws Exception
     */
    public static String object2Xml(Object ro, Class<?> types) throws Exception {
        if (null == ro) {
            return null;
        }
        XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
        xstream.alias("xml", types);
        return xstream.toXML(ro);
    }
    
}

 Cookie工具类

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;


/**
 * 
 * @Title: CookieUtils.java
 * @Description: Cookie 工具类
 */
public final class CookieUtils {

    final static Logger logger = LoggerFactory.getLogger(CookieUtils.class);
    
    /**
     * 
     * @Description: 得到Cookie的值, 不编码
     * @param request
     * @param cookieName
     * @return
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName) {
        return getCookieValue(request, cookieName, false);
    }
    
    /**
     * 
     * @Description: 得到Cookie的值
     * @param request
     * @param cookieName
     * @param isDecoder
     * @return
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
            return null;
        }
        String retValue = null;
        try {
            for (int i = 0; i < cookieList.length; i++) {
                if (cookieList[i].getName().equals(cookieName)) {
                    if (isDecoder) {
                        retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
                    } else {
                        retValue = cookieList[i].getValue();
                    }
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return retValue;
    }

    /**
     * 
     * @Description: 得到Cookie的值
     * @param request
     * @param cookieName
     * @param encodeString
     * @return
     */
    public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
        Cookie[] cookieList = request.getCookies();
        if (cookieList == null || cookieName == null) {
            return null;
        }
        String retValue = null;
        try {
            for (int i = 0; i < cookieList.length; i++) {
                if (cookieList[i].getName().equals(cookieName)) {
                    retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
                    break;
                }
            }
        } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
        }
        return retValue;
    }

    /**
     * 
     * @Description: 设置Cookie的值 不设置生效时间默认浏览器关闭即失效,也不编码
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
            String cookieValue) {
        setCookie(request, response, cookieName, cookieValue, -1);
    }

    /**
     * 
     * @Description: 设置Cookie的值 在指定时间内生效,但不编码
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param cookieMaxage
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
            String cookieValue, int cookieMaxage) {
        setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
    }

    /**
     * 
     * @Description: 设置Cookie的值 不设置生效时间,但编码
     * 在服务器被创建，返回给客户端，并且保存客户端
     * 如果设置了SETMAXAGE(int seconds)，会把cookie保存在客户端的硬盘中
     * 如果没有设置，会默认把cookie保存在浏览器的内存中
     * 一旦设置setPath()：只能通过设置的路径才能获取到当前的cookie信息
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param isEncode
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
            String cookieValue, boolean isEncode) {
        setCookie(request, response, cookieName, cookieValue, -1, isEncode);
    }

   /**
    * 
    * @Description: 设置Cookie的值 在指定时间内生效, 编码参数
    * @param request
    * @param response
    * @param cookieName
    * @param cookieValue
    * @param cookieMaxage
    * @param isEncode
    */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
            String cookieValue, int cookieMaxage, boolean isEncode) {
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
    }

    /**
     * 
     * @Description: 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param cookieMaxage
     * @param encodeString
     */
    public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
            String cookieValue, int cookieMaxage, String encodeString) {
        doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
    }

    /**
     * 
     * @Description: 删除Cookie带cookie域名
     * @param request
     * @param response
     * @param cookieName
     */
    public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
            String cookieName) {
        doSetCookie(request, response, cookieName, null, -1, false);
//        doSetCookie(request, response, cookieName, "", -1, false);
    }

    
    /**
     * 
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param cookieMaxage    cookie生效的最大秒数
     * @param isEncode
     */
    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
            String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
        try {
            if (cookieValue == null) {
                cookieValue = "";
            } else if (isEncode) {
                cookieValue = URLEncoder.encode(cookieValue, "utf-8");
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0)
                cookie.setMaxAge(cookieMaxage);
            if (null != request) {// 设置域名的cookie
                String domainName = getDomainName(request);
                logger.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
             e.printStackTrace();
        }
    }

    /**
     * 
     * @Description: 设置Cookie的值，并使其在指定时间内生效
     * @param request
     * @param response
     * @param cookieName
     * @param cookieValue
     * @param cookieMaxage    cookie生效的最大秒数
     * @param encodeString
     */
    private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
            String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
        try {
            if (cookieValue == null) {
                cookieValue = "";
            } else {
                cookieValue = URLEncoder.encode(cookieValue, encodeString);
            }
            Cookie cookie = new Cookie(cookieName, cookieValue);
            if (cookieMaxage > 0)
                cookie.setMaxAge(cookieMaxage);
            if (null != request) {// 设置域名的cookie
                String domainName = getDomainName(request);
                logger.info("========== domainName: {} ==========", domainName);
                if (!"localhost".equals(domainName)) {
                    cookie.setDomain(domainName);
                }
            }
            cookie.setPath("/");
            response.addCookie(cookie);
        } catch (Exception e) {
             e.printStackTrace();
        }
    }

    /**
     * 
     * @Description: 得到cookie的域名
     * @return
     */
    private static final String getDomainName(HttpServletRequest request) {
        String domainName = null;

        String serverName = request.getRequestURL().toString();
        if (serverName == null || serverName.equals("")) {
            domainName = "";
        } else {
            serverName = serverName.toLowerCase();
            serverName = serverName.substring(7);
            final int end = serverName.indexOf("/");
            serverName = serverName.substring(0, end);
            if (serverName.indexOf(":") > 0) {
                String[] ary = serverName.split("\:");
                serverName = ary[0];
            }

            final String[] domains = serverName.split("\.");
            int len = domains.length;
            if (len > 3 && !isIp(serverName)) {
                // www.xxx.com.cn
                domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
            } else if (len <= 3 && len > 1) {
                // xxx.com or xxx.cn
                domainName = "." + domains[len - 2] + "." + domains[len - 1];
            } else {
                domainName = serverName;
            }
        }
        return domainName;
    }
    
    public static String trimSpaces(String IP){//去掉IP字符串前后所有的空格  
        while(IP.startsWith(" ")){  
               IP= IP.substring(1,IP.length()).trim();  
            }  
        while(IP.endsWith(" ")){  
               IP= IP.substring(0,IP.length()-1).trim();  
            }  
        return IP;  
    }  
    
    public static boolean isIp(String IP){//判断是否是一个IP  
        boolean b = false;  
        IP = trimSpaces(IP);  
        if(IP.matches("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")){  
            String s[] = IP.split("\.");  
            if(Integer.parseInt(s[0])<255)  
                if(Integer.parseInt(s[1])<255)  
                    if(Integer.parseInt(s[2])<255)  
                        if(Integer.parseInt(s[3])<255)  
                            b = true;  
        }  
        return b;  
    }  

}

 获取URL参数

    /**
     * 将url参数转为map
     * @param param
     * @return java.util.Map<java.lang.String,java.lang.String>
     */
    public static Map<String, String> getUrlParams(String param) throws Exception {
        Map<String, String> map = new LinkedHashMap<>(0);
        if (StringUtils.isBlank(param)) {
            return map;
        }
        if(param.contains("?")){
            param=param.split("\?")[1];
        }
        String[] params = param.split("&");
        for (int i = 0; i < params.length; i++) {
            String[] p = params[i].split("=");
            if (p.length == 2) {
                map.put(p[0], URLEncoder.encode(p[1],"utf-8"));
            }
        }
        return map;
    }