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java web判断服务器是否是本机

由 你。 提交于 2019-12-05 13:43:31
1,如何获取浏览器的ip Java代码 /*** * 获取客户端ip地址(可以穿透代理) * @param request * @return */ public static String getClientIpAddr(HttpServletRequest request) { String ip = request.getHeader( "X-Forwarded-For" ); if (ip == null || ip.length() == 0 || "unknown" .equalsIgnoreCase(ip)) { ip = request.getHeader( "Proxy-Client-IP" ); } if (ip == null || ip.length() == 0 || "unknown" .equalsIgnoreCase(ip)) { ip = request.getHeader( "WL-Proxy-Client-IP" ); } if (ip == null || ip.length() == 0 || "unknown" .equalsIgnoreCase(ip)) { ip = request.getHeader( "HTTP_X_FORWARDED_FOR" ); } if (ip == null || ip.length() == 0 ||

Scala avoid null

由 ＊爱你＆永不变心＊ 提交于 2019-12-05 01:20:41
Scala avoid null 在Java里， NullPointerException不知道会在什么时候发生，导致代码到处都是判断null的情况。比如如下例子， val stateCapitals = Map( "Alabama" -> "Montgomery", "Alaska" -> "Juneau", "Wyoming" -> "Cheyenne") println("Get the capitals wrapped in Options:") println("Alabama: " + stateCapitals.get("Alabama")) println("Wyoming: " + stateCapitals.get("Wyoming")) println("Unknown: " + stateCapitals.get("Unknown")) println("Get the capitals themselves out of the Options:") println("Alabama: " + stateCapitals.get("Alabama").get) println("Wyoming: " + stateCapitals.get("Wyoming").getOrElse("Oops!")) println("Unknown: " +

OpenCV for Python - AttributeError: 'module' object has no attribute 'connectedComponents'

由 匿名 (未验证) 提交于 2019-12-03 08:36:05
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm trying the watershed algorithm using the following tutorial for OpenCV: https://opencv-python-tutroals.readthedocs.org/en/latest/py_tutorials/py_imgproc/py_watershed/py_watershed.html#watershed I already fixed an error, now the code looks like this: import numpy as np import cv2 from matplotlib import pyplot as plt from sys import argv img = cv2.imread(argv[1]) gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY) ret, thresh = cv2.threshold(gray,0,255,cv2.THRESH_BINARY_INV+cv2.THRESH_OTSU) # noise removal kernel = np.ones((3,3),np.uint8) opening

一个奇怪的异常，SSH使用注解方式

由 我与影子孤独终老i 提交于 2019-12-03 08:08:23
异常信息如下 Exception in thread "main" org.springframework.orm.hibernate3.HibernateSystemException: Unknown entity: cn.pb.jbit.tcjc034.entity.Director; nested exception is org.hibernate.MappingException: Unknown entity: cn.pb.jbit.tcjc034.entity.Director at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:679) at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412) at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411) at org

[Unknown custom element: 《router-link》 - did you register the component correctly?

由 匿名 (未验证) 提交于 2019-12-03 00:24:01
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <script src="js/vue-router.js" type="text/javascript" charset="utf-8"></script> <script src="js/vue.js" type="text/javascript" charset="utf-8"></script> <body> <div id="box"> <div> <router-link to="/home">主页</router-link> <router-link to="/news">新闻</router-link> </div> <div> <router-view></router-view> </div> </div> </body> <script type="text/javascript"> //创建模板 var Home = { template: `<div><h2>我是主页</h2></div>` } var News = { template: `<div><h2>我是新闻</h2></div>` } //配置路由，创建路由实例 var router = new VueRouter({ routes: [{

[Unknown custom element: 《router-link》 - did you register the component correctly?

由 匿名 (未验证) 提交于 2019-12-03 00:22:01
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> </head> <script src="js/vue-router.js" type="text/javascript" charset="utf-8"></script> <script src="js/vue.js" type="text/javascript" charset="utf-8"></script> <body> <div id="box"> <div> <router-link to="/home">主页</router-link> <router-link to="/news">新闻</router-link> </div> <div> <router-view></router-view> </div> </div> </body> <script type="text/javascript"> //创建模板 var Home = { template: `<div><h2>我是主页</h2></div>` } var News = { template: `<div><h2>我是新闻</h2></div>` } //配置路由，创建路由实例 var router = new VueRouter({ routes: [{

Unknown initial character set index &#039;255&#039; received from server. 问题解决

由 匿名 (未验证) 提交于 2019-12-02 23:26:52
出现这个问题应该是因为字符集编码方式有问题 所以在JDBC连接的url后面加上“?useUnicode=true&characterEncoding=utf8”就可以了 比如 Connection conn = DriverManager.getConnection(“jdbc:mysql://localhost/student?useUnicode=true&characterEncoding=utf8”, “root”, “123456”); 文章来源: https://blog.csdn.net/justinzwd/article/details/88846187

pvs显示unknown device

由 ぐ巨炮叔叔 提交于 2019-12-02 23:01:29
一 、不要unknown的那块pv盘的解决办法 [root@gezi ~]# pvs WARNING: Device for PV D1LLfT-3Hle-NbrP-5165-Q6WR-2UWF-2xEIR3 not found or rejected by a filter. PV VG Fmt Attr PSize PFree /dev/xvda2 vg1 lvm2 a-- 79.51g 23.62g /dev/xvdb lvm2 --- 250.00g 250.00g unknown device vg1 lvm2 a-m 250.00g 250.00g [root@gezi ~]# vgs WARNING: Device for PV D1LLfT-3Hle-NbrP-5165-Q6WR-2UWF-2xEIR3 not found or rejected by a filter. VG #PV #LV #SN Attr VSize VFree vg1 2 2 0 wz-pn- 329.50g 273.62g [root@gezi ~]# vgreduce --removemissing /dev/vg1 WARNING: Device for PV D1LLfT-3Hle-NbrP-5165-Q6WR-2UWF-2xEIR3 not found or rejected by

mysqlbinlog: unknown variable 'default-character-set=utf8'

由 [亡魂溺海] 提交于 2019-12-02 22:33:19
[xxx@dbhost log]$ mysqlbinlog mysql-bin.000004 mysqlbinlog: unknown variable 'default-character-set=utf8' 原因是mysqlbinlog这个工具无法识别binlog中的配置中的default-character-set=utf8这个指令。 两个方法可以解决这个问题 一是在MySQL的配置/etc/my.cnf中将default-character-set=utf8 修改为 character-set-server = utf8，但是这需要重启MySQL服务，如果你的MySQL服务正在忙，那这样的代价会比较大。 二是用mysqlbinlog --no-defaults mysql-bin.000004 命令打开 来源： https://www.cnblogs.com/igoodful/p/11765055.html

MYSQL:Unknown column &#039;字段名&#039; in &#039;field list&#039; 错误

由 匿名 (未验证) 提交于 2019-12-02 21:59:42
dynamic 读值少写#号 错误写法 低级错误 正确写法 INSERT INTO pay_product_sep( <dynamic prepend=" "> <isNotEmpty prepend="," property="productCode">product_code</isNotEmpty> <isNotEmpty prepend="," property="sepStatus">sep_status</isNotEmpty> </dynamic> )VALUES( <dynamic prepend=" "> <isNotEmpty prepend="," property="productCode">#product#</isNotEmpty> <isNotEmpty prepend="," property="sepStatus">#sepStatus#</isNotEmpty> ) </dynamic> 文章来源: MYSQL:Unknown column '字段名' in 'field list' 错误
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