实用工具类（持续更新）

Java脱敏工具

 1 private static final int SIZE = 6;
 2     private static final String SYMBOL = "*";
 3     /**
 4      * 通用脱敏方法
 5      * @param value
 6      * @return
 7      */
 8     public static String commonDisplay(String value) {
 9         if (null == value || "".equals(value)) {
10             return value;
11         }
12         int len = value.length();
13         int pamaone = len / 2;
14         int pamatwo = pamaone - 1;
15         int pamathree = len % 2;
16         StringBuilder stringBuilder = new StringBuilder();
17         if (len <= 2) {
18             if (pamathree == 1) {
19                 return SYMBOL;
20             }
21             stringBuilder.append(SYMBOL);
22             stringBuilder.append(value.charAt(len - 1));
23         } else {
24             if (pamatwo <= 0) {
25                 stringBuilder.append(value.substring(0, 1));
26                 stringBuilder.append(SYMBOL);
27                 stringBuilder.append(value.substring(len - 1, len));
28 
29             } else if (pamatwo >= SIZE / 2 && SIZE + 1 != len) {
30                 int pamafive = (len - SIZE) / 2;
31                 stringBuilder.append(value.substring(0, pamafive));
32                 for (int i = 0; i < SIZE; i++) {
33                     stringBuilder.append(SYMBOL);
34                 }
35                 if ((pamathree == 0 && SIZE / 2 == 0) || (pamathree != 0 && SIZE % 2 != 0)) {
36                     stringBuilder.append(value.substring(len - pamafive, len));
37                 } else {
38                     stringBuilder.append(value.substring(len - (pamafive + 1), len));
39                 }
40             } else {
41                 int pamafour = len - 2;
42                 stringBuilder.append(value.substring(0, 1));
43                 for (int i = 0; i < pamafour; i++) {
44                     stringBuilder.append(SYMBOL);
45                 }
46                 stringBuilder.append(value.substring(len - 1, len));
47             }
48         }
49         return stringBuilder.toString();
50     }
View Code

 XML工具

 1 import com.thoughtworks.xstream.XStream;
 2 import com.thoughtworks.xstream.io.xml.DomDriver;
 3 import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
 4 import java.io.InputStream;
 5 
 6 public class XmlUtil {
 7     
 8     /**
 9      * 
10      * @Description: xml字符串转换为对象
11      * @param inputXml
12      * @param type
13      * @return
14      * @throws Exception
15      */
16     public static Object xml2Object(String inputXml, Class<?> type) throws Exception {
17         if (null == inputXml || "".equals(inputXml)) {
18             return null;
19         }
20         XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
21         xstream.alias("xml", type);
22         return xstream.fromXML(inputXml);
23     }
24     
25     /**
26      * 
27      * @Description: 从inputStream中读取对象
28      * @param inputStream
29      * @param type
30      * @return
31      * @throws Exception
32      */
33     public static Object xml2Object(InputStream inputStream, Class<?> type) throws Exception {
34         if (null == inputStream) {
35             return null;
36         }
37         XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
38         xstream.alias("xml", type);
39         return xstream.fromXML(inputStream, type);
40     }
41 
42     /**
43      * 
44      * @Description: 对象转换为xml字符串
45      * @param ro
46      * @param types
47      * @return
48      * @throws Exception
49      */
50     public static String object2Xml(Object ro, Class<?> types) throws Exception {
51         if (null == ro) {
52             return null;
53         }
54         XStream xstream = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
55         xstream.alias("xml", types);
56         return xstream.toXML(ro);
57     }
58     
59 }
View Code

 Cookie工具类

  1 import org.slf4j.Logger;
  2 import org.slf4j.LoggerFactory;
  3 import javax.servlet.http.Cookie;
  4 import javax.servlet.http.HttpServletRequest;
  5 import javax.servlet.http.HttpServletResponse;
  6 import java.io.UnsupportedEncodingException;
  7 import java.net.URLDecoder;
  8 import java.net.URLEncoder;
  9 
 10 
 11 /**
 12  * 
 13  * @Title: CookieUtils.java
 14  * @Description: Cookie 工具类
 15  */
 16 public final class CookieUtils {
 17 
 18     final static Logger logger = LoggerFactory.getLogger(CookieUtils.class);
 19     
 20     /**
 21      * 
 22      * @Description: 得到Cookie的值, 不编码
 23      * @param request
 24      * @param cookieName
 25      * @return
 26      */
 27     public static String getCookieValue(HttpServletRequest request, String cookieName) {
 28         return getCookieValue(request, cookieName, false);
 29     }
 30     
 31     /**
 32      * 
 33      * @Description: 得到Cookie的值
 34      * @param request
 35      * @param cookieName
 36      * @param isDecoder
 37      * @return
 38      */
 39     public static String getCookieValue(HttpServletRequest request, String cookieName, boolean isDecoder) {
 40         Cookie[] cookieList = request.getCookies();
 41         if (cookieList == null || cookieName == null) {
 42             return null;
 43         }
 44         String retValue = null;
 45         try {
 46             for (int i = 0; i < cookieList.length; i++) {
 47                 if (cookieList[i].getName().equals(cookieName)) {
 48                     if (isDecoder) {
 49                         retValue = URLDecoder.decode(cookieList[i].getValue(), "UTF-8");
 50                     } else {
 51                         retValue = cookieList[i].getValue();
 52                     }
 53                     break;
 54                 }
 55             }
 56         } catch (UnsupportedEncodingException e) {
 57             e.printStackTrace();
 58         }
 59         return retValue;
 60     }
 61 
 62     /**
 63      * 
 64      * @Description: 得到Cookie的值
 65      * @param request
 66      * @param cookieName
 67      * @param encodeString
 68      * @return
 69      */
 70     public static String getCookieValue(HttpServletRequest request, String cookieName, String encodeString) {
 71         Cookie[] cookieList = request.getCookies();
 72         if (cookieList == null || cookieName == null) {
 73             return null;
 74         }
 75         String retValue = null;
 76         try {
 77             for (int i = 0; i < cookieList.length; i++) {
 78                 if (cookieList[i].getName().equals(cookieName)) {
 79                     retValue = URLDecoder.decode(cookieList[i].getValue(), encodeString);
 80                     break;
 81                 }
 82             }
 83         } catch (UnsupportedEncodingException e) {
 84              e.printStackTrace();
 85         }
 86         return retValue;
 87     }
 88 
 89     /**
 90      * 
 91      * @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
 92      * @param request
 93      * @param response
 94      * @param cookieName
 95      * @param cookieValue
 96      */
 97     public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
 98             String cookieValue) {
 99         setCookie(request, response, cookieName, cookieValue, -1);
100     }
101 
102     /**
103      * 
104      * @Description: 设置Cookie的值 在指定时间内生效,但不编码
105      * @param request
106      * @param response
107      * @param cookieName
108      * @param cookieValue
109      * @param cookieMaxage
110      */
111     public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
112             String cookieValue, int cookieMaxage) {
113         setCookie(request, response, cookieName, cookieValue, cookieMaxage, false);
114     }
115 
116     /**
117      * 
118      * @Description: 设置Cookie的值 不设置生效时间,但编码
119      * 在服务器被创建，返回给客户端，并且保存客户端
120      * 如果设置了SETMAXAGE(int seconds)，会把cookie保存在客户端的硬盘中
121      * 如果没有设置，会默认把cookie保存在浏览器的内存中
122      * 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
123      * @param request
124      * @param response
125      * @param cookieName
126      * @param cookieValue
127      * @param isEncode
128      */
129     public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
130             String cookieValue, boolean isEncode) {
131         setCookie(request, response, cookieName, cookieValue, -1, isEncode);
132     }
133 
134    /**
135     * 
136     * @Description: 设置Cookie的值 在指定时间内生效, 编码参数
137     * @param request
138     * @param response
139     * @param cookieName
140     * @param cookieValue
141     * @param cookieMaxage
142     * @param isEncode
143     */
144     public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
145             String cookieValue, int cookieMaxage, boolean isEncode) {
146         doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, isEncode);
147     }
148 
149     /**
150      * 
151      * @Description: 设置Cookie的值 在指定时间内生效, 编码参数(指定编码)
152      * @param request
153      * @param response
154      * @param cookieName
155      * @param cookieValue
156      * @param cookieMaxage
157      * @param encodeString
158      */
159     public static void setCookie(HttpServletRequest request, HttpServletResponse response, String cookieName,
160             String cookieValue, int cookieMaxage, String encodeString) {
161         doSetCookie(request, response, cookieName, cookieValue, cookieMaxage, encodeString);
162     }
163 
164     /**
165      * 
166      * @Description: 删除Cookie带cookie域名
167      * @param request
168      * @param response
169      * @param cookieName
170      */
171     public static void deleteCookie(HttpServletRequest request, HttpServletResponse response,
172             String cookieName) {
173         doSetCookie(request, response, cookieName, null, -1, false);
174 //        doSetCookie(request, response, cookieName, "", -1, false);
175     }
176 
177     
178     /**
179      * 
180      * @Description: 设置Cookie的值，并使其在指定时间内生效
181      * @param request
182      * @param response
183      * @param cookieName
184      * @param cookieValue
185      * @param cookieMaxage    cookie生效的最大秒数
186      * @param isEncode
187      */
188     private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
189             String cookieName, String cookieValue, int cookieMaxage, boolean isEncode) {
190         try {
191             if (cookieValue == null) {
192                 cookieValue = "";
193             } else if (isEncode) {
194                 cookieValue = URLEncoder.encode(cookieValue, "utf-8");
195             }
196             Cookie cookie = new Cookie(cookieName, cookieValue);
197             if (cookieMaxage > 0)
198                 cookie.setMaxAge(cookieMaxage);
199             if (null != request) {// 设置域名的cookie
200                 String domainName = getDomainName(request);
201                 logger.info("========== domainName: {} ==========", domainName);
202                 if (!"localhost".equals(domainName)) {
203                     cookie.setDomain(domainName);
204                 }
205             }
206             cookie.setPath("/");
207             response.addCookie(cookie);
208         } catch (Exception e) {
209              e.printStackTrace();
210         }
211     }
212 
213     /**
214      * 
215      * @Description: 设置Cookie的值，并使其在指定时间内生效
216      * @param request
217      * @param response
218      * @param cookieName
219      * @param cookieValue
220      * @param cookieMaxage    cookie生效的最大秒数
221      * @param encodeString
222      */
223     private static final void doSetCookie(HttpServletRequest request, HttpServletResponse response,
224             String cookieName, String cookieValue, int cookieMaxage, String encodeString) {
225         try {
226             if (cookieValue == null) {
227                 cookieValue = "";
228             } else {
229                 cookieValue = URLEncoder.encode(cookieValue, encodeString);
230             }
231             Cookie cookie = new Cookie(cookieName, cookieValue);
232             if (cookieMaxage > 0)
233                 cookie.setMaxAge(cookieMaxage);
234             if (null != request) {// 设置域名的cookie
235                 String domainName = getDomainName(request);
236                 logger.info("========== domainName: {} ==========", domainName);
237                 if (!"localhost".equals(domainName)) {
238                     cookie.setDomain(domainName);
239                 }
240             }
241             cookie.setPath("/");
242             response.addCookie(cookie);
243         } catch (Exception e) {
244              e.printStackTrace();
245         }
246     }
247 
248     /**
249      * 
250      * @Description: 得到cookie的域名
251      * @return
252      */
253     private static final String getDomainName(HttpServletRequest request) {
254         String domainName = null;
255 
256         String serverName = request.getRequestURL().toString();
257         if (serverName == null || serverName.equals("")) {
258             domainName = "";
259         } else {
260             serverName = serverName.toLowerCase();
261             serverName = serverName.substring(7);
262             final int end = serverName.indexOf("/");
263             serverName = serverName.substring(0, end);
264             if (serverName.indexOf(":") > 0) {
265                 String[] ary = serverName.split("\:");
266                 serverName = ary[0];
267             }
268 
269             final String[] domains = serverName.split("\.");
270             int len = domains.length;
271             if (len > 3 && !isIp(serverName)) {
272                 // www.xxx.com.cn
273                 domainName = "." + domains[len - 3] + "." + domains[len - 2] + "." + domains[len - 1];
274             } else if (len <= 3 && len > 1) {
275                 // xxx.com or xxx.cn
276                 domainName = "." + domains[len - 2] + "." + domains[len - 1];
277             } else {
278                 domainName = serverName;
279             }
280         }
281         return domainName;
282     }
283     
284     public static String trimSpaces(String IP){//去掉IP字符串前后所有的空格  
285         while(IP.startsWith(" ")){  
286                IP= IP.substring(1,IP.length()).trim();  
287             }  
288         while(IP.endsWith(" ")){  
289                IP= IP.substring(0,IP.length()-1).trim();  
290             }  
291         return IP;  
292     }  
293     
294     public static boolean isIp(String IP){//判断是否是一个IP  
295         boolean b = false;  
296         IP = trimSpaces(IP);  
297         if(IP.matches("\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}")){  
298             String s[] = IP.split("\.");  
299             if(Integer.parseInt(s[0])<255)  
300                 if(Integer.parseInt(s[1])<255)  
301                     if(Integer.parseInt(s[2])<255)  
302                         if(Integer.parseInt(s[3])<255)  
303                             b = true;  
304         }  
305         return b;  
306     }  
307 
308 }
View Code

 获取URL参数

 1     /**
 2      * 将url参数转为map
 3      * @param param
 4      * @return java.util.Map<java.lang.String,java.lang.String>
 5      */
 6     public static Map<String, String> getUrlParams(String param) throws Exception {
 7         Map<String, String> map = new LinkedHashMap<>(0);
 8         if (StringUtils.isBlank(param)) {
 9             return map;
10         }
11         if(param.contains("?")){
12             param=param.split("\?")[1];
13         }
14         String[] params = param.split("&");
15         for (int i = 0; i < params.length; i++) {
16             String[] p = params[i].split("=");
17             if (p.length == 2) {
18                 map.put(p[0], URLEncoder.encode(p[1],"utf-8"));
19             }
20         }
21         return map;
22     }
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原文地址：https://www.cnblogs.com/huozhonghun/p/13772934.html