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男生女生差差差的软件排行榜-热门实用的男生女生差差差的软件前十名推荐-游戏窝

ES6.0.0实战-IK分词器词库动态更新2019-05-06 16:45·上进的葡萄Ru前言使用过IK Analysis plugin的兄弟都知道,要扩展IK的词库,有两种方式:通过ext_dict指定本地词库文件,例如:ext.dic通过谤别尘辞迟别冲别虫迟冲诲颈肠迟指定远程词库请求地址,例如:http://yoursite.com/getCustomDict第一种方式扩展简单,但维护起来比较麻烦。假设ES集群包含多个节点,那么每个节点都要更新词库文件,而且要使其生效,还必须重启每个节点。第二种方式扩展稍显麻烦,但能在不重启ES的情况下动态扩展词库。但要实现该功能,需要提供HTTP接口,而且还要按照约定在响应头中返回Last-Modified,ETag header。线程收到响应时会比较这两个header(详细操作可查看源码),以便实现增量更新.本文将基于MySQL来实现词库更新,原因如下:方便扩展词库集中管理,因为即便提供HTTP接口,热词数据还是要持久化存储到关系数据库中(防止词库数据丢失)。增量更新更简单,首次更新热词时,先记录下最后一条单词的时间戳,下次更新就可以该时间戳为起点,实现后续的增量更新。实现步骤1.下载elasticsearch-analysis-ik-6.0.0源码,其下载地址为:https://github.com/medcl/elasticsearch-analysis-ik/archive/v6.0.0.zip2.解压并以Maven Project导入Eclipse,导入后如下所示:上面标有红色箭头的就是本次要修改或添加的内容。3.修改pom.xml,在元素下增加尘测蝉辩濒-箩诲产肠驱动依赖:mysqlmysql-connector-java5.1.474.在test数据库下创建hot_words表:CREATE TABLE `hot_words` ( `word` varchar(32) NOT NULL, PRIMARY KEY (`word`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;5.在工程的config目录下新增jdbc-hot-word.properties文件。其内容为:#数据库URLjdbc.url=jdbc:mysql://192.168.88.130:3306/test#数据库用户名jdbc.user=test#数据库密码jdbc.password=test123456#加载词库的sqljdbc.reload.sql=select word from hot_words#重新加载词库的频率jdbc.reload.interval=56.编码在org.wltea.analyzer.dic包下新增JdbcMonitor类,其代码为:package org.wltea.analyzer.dic;import org.apache.logging.log4j.Logger;import org.elasticsearch.common.logging.ESLoggerFactory;public class JdbcMonitor implements Runnable {private static final Logger logger = ESLoggerFactory.getLogger(JdbcMonitor.class.getName()); public void run() { try { logger.info("JdbcMonitor..."); Dictionary.getSingleton().reLoadMainDict(); } catch (Exception e) { } }}修改org.wltea.analyzer.dic.Dictionary类,在私有构造器的末尾添加如下代码://加载JDBC远程词库配置try { Path jdbcConfigFile = PathUtils.get(getDictRoot(), PATH_JDBC_HOT_WORD); props.load(new FileInputStream(jdbcConfigFile.toFile())); logger.info("加载"+PATH_JDBC_HOT_WORD+"成功");} catch (Exception e) { logger.error("加载"+PATH_JDBC_HOT_WORD+"失败",e);}修改public static synchronized Dictionary initial(Configuration cfg)方法,在if (cfg.isEnableRemoteDict())方法体内增加如下代码:try { int interval = Integer.valueOf(singleton.getProperty("jdbc.reload.interval")); logger.info("加载JDBC远程词库..."); //注意,这里的单位是分 pool.scheduleWithFixedDelay(new JdbcMonitor(), 1, interval, TimeUnit.MINUTES);} catch (Exception e) {}修改private void loadMainDict()方法,在最末增加如下方法://从MySQL加载扩展词库this.loadExtDictFormMySQL();在该类中新增如下方法: /** ** 从mysql加载热更新词典 */ private void loadExtDictFormMySQL() { Connection conn = null; Statement stmt = null; ResultSet rs = null; try { logger.info("query hot dict from mysql, " + props.getProperty("jdbc.reload.sql") + "..."); conn = DriverManager.getConnection(props.getProperty("jdbc.url"), props.getProperty("jdbc.user"),props.getProperty("jdbc.password")); stmt = conn.createStatement(); rs = stmt.executeQuery(props.getProperty("jdbc.reload.sql")); while (rs.next()) { String theWord = rs.getString("word"); logger.info("hot word from mysql: " + theWord); _MainDict.fillSegment(theWord.trim().toCharArray()); } } catch (Exception e) { logger.error("load extend hot words throw exception:", e); } finally { if (rs != null) { try { rs.close(); } catch (SQLException e) { logger.error("close rs throw exception:", e); } } if (stmt != null) { try { stmt.close(); } catch (SQLException e) { logger.error("close stmt throw exception:", e); } } if (conn != null) { try { conn.close(); } catch (SQLException e) { logger.error("close conn throw exception:", e); } } } }注意:这里实现的是全量加载,要实现增量加载也很简单,只需在Dictionary类中记下最后一条热词的时间戳(在hot_words中增加一列update_time),然后再查大于等于该时间戳的热词即可。7.修改config/IKAnalyzer.cfg.xml文件,在下增加如下配置来启动远程词库: true8.使用mvn clean package打包项目9.ES服务器端操作将上一步生成的zip包(位于target\releases\elasticsearch-analysis-ik-6.0.0.zip)拷贝到ES服务器端$ES_HOME/plugins目录下,解压并重名为ik将mysql-connector-java-5.1.47.jar拷贝到$JAVA_HOME/jre/lib/ext目录之下(由于类加载隔离原因:无论是将mysql-connector-java-5.1.47.jar拷到$ES_HOME/plugins/ik还是$ES_HOME/lib下,都无法运行,这比较蛋疼)。进入$ES_HOME/config目录,新增plugin-security.policy文件,其内容为:grant {permission java.lang.RuntimePermission "createClassLoader";permission java.lang.RuntimePermission "getClassLoader";permission java.net.SocketPermission "192.168.88.130:3306","connect,resolve";};上述文件主要用于授权,其中java.net.SocketPermission中设置的是远程数据库的主机端 口。修改jvm.options文件来设置Java安全策略文件,增加如下配置:-Djava.security.policy=/usr/local/elasticsearch-6.0.0/config/plugin-security.policy注:最好使用绝对路径。10.重启ES验证正常情况下,应该可以看到如下类似截图:

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男生女生差差差的软件排行榜-热门实用的男生女生差差差的软件前十名推荐-游戏窝

此外必须让设备摆脱磁性的影响磁性作用会改变温度要想不受影响必须有效屏蔽磁性要求关键部位金属材料本身是消除磁性的这本来就非常困难还要求做好整体的磁性屏蔽工作这里面的难度只有相关工作人员才能体会

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坏桃子(咬),2022农村适婚青年“男多女少”也进一步抬高了彩礼。江西省宜春市高安市蓝坊镇魏家村村支书魏叁忠说,村里适婚青年中男青年约占七成,娶媳妇难问题突出。男生女生差差差的软件排行榜-热门实用的男生女生差差差的软件前十名推荐-游戏窝

2024-07-04 19:54·光明网

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