SpringBoot拓展IK远程动态词典（可以定义拓展）

自定义字典控制器

    首先新建一个控制器用来处理Rest请求的添加删除词典，以及查询词典。

package com.topcom.test.es.controller;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;

import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @Author BigKang
 * @Date 2021/1/28 1:58 下午
 * @Motto 仰天大笑撸码去, 我辈岂是蓬蒿人
 * @Summarize 字典控制器
 */
@RestController
public class DictController {

    /**
     * 最后修改时间
     */
    private Date lastModified = new Date();

    /**
     * 停用词最后修改时间
     */
    private Date stopLastModified = new Date();

    /**
     * 分词词典表
     */
    private List<String> dictTable = new ArrayList<>();

    /**
     * 停用词词典表
     */
    private List<String> stopDictTable = new ArrayList<>();


    /**
     * 初始化自定字典，也可以从数据库读取然后进行加载
     */
    @PostConstruct
    public void init() {
        dictTable.add("aaa");
        //dictTable.add("盖伦大宝剑");

        stopDictTable.add("枪支");
        stopDictTable.add("仿真枪");
    }

    /**
     * 添加词典
     * @param dict 词典
     * @param stop 是否停用词
     * @return
     */
    @PostMapping("addDict")
    public boolean addDict(String dict,Boolean stop) {
        // 判断是否存在，如果不存在则添加
        if (dict != null && dict.trim().length() > 0) {
            // 如果不是停用词则添加到词典
            if(stop == null || !stop && !dictTable.contains(dict)){
                dictTable.add(dict);
                lastModified = new Date();
                return true;
            }else if(stop && !stopDictTable.contains(dict)){
                stopDictTable.add(dict);
                stopLastModified = new Date();
                return true;
            }
        }
        return false;
    }

    /**
     * 删除词典
     * @param dict 词典
     * @param stop 是否停用词
     * @return
     */
    @DeleteMapping("delDict")
    public boolean delDict(String dict,Boolean stop) {
        // 判断是否存在，如果不存在则添加
        if (dict != null && dict.trim().length() > 0) {
            // 如果不是停用词则添加到词典
            if(stop == null || !stop && dictTable.contains(dict)){
                dictTable.remove(dict);
                lastModified = new Date();
                return true;
            }else if(stop && stopDictTable.contains(dict)){
                stopDictTable.remove(dict);
                stopLastModified = new Date();
                return true;
            }
        }
        return false;
    }

    /**
     * 获取字典
     * @param httpServletResponse
     */
    @GetMapping("getCustomDict")
    public void getCustomDict(HttpServletResponse httpServletResponse) throws IOException {
        getDict(null,httpServletResponse);
        httpServletResponse.flushBuffer();
    }

    /**
     * 获取停用字典
     * @param httpServletResponse
     */
    @GetMapping("getCustomStopDict")
    public void getCustomStopDict(HttpServletResponse httpServletResponse) throws IOException {
        getDict(true,httpServletResponse);
        httpServletResponse.flushBuffer();
    }

    /**
     * 获取字典
     * @param stop
     * @param httpServletResponse
     */
    public void getDict(Boolean stop,HttpServletResponse httpServletResponse) {
        Long time = null;
        String eTag = null;
        List<String> dictTable = null;
        if(stop == null || !stop){
            time = lastModified.getTime();
            dictTable = this.dictTable;
            eTag = String.valueOf(this.dictTable.hashCode()) + "-" +String.valueOf(this.dictTable.size());
        }else {
            time = stopLastModified.getTime();
            dictTable = this.stopDictTable;
            eTag = String.valueOf(this.stopDictTable.hashCode()) + "-" +String.valueOf(this.stopDictTable.size());
        }
        httpServletResponse.setDateHeader("Last-Modified",time);
        httpServletResponse.setHeader("ETag", eTag);
        httpServletResponse.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
        try (OutputStream outputStream = httpServletResponse.getOutputStream();){
            StringBuilder str = new StringBuilder();
            for (String dict : dictTable) {
                str.append(dict);
                str.append("\n");
            }
            outputStream.write(str.toString().getBytes("utf-8"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

    相应的接口地址以及描述

（分词词典）
    添加词典：“APP地址”/addDict?dict=核心&stop=true
    删除词典：“APP地址”/delDict?dict=禁止&stop=false
    获取词典：“APP地址”/getCustomDict
    获取停用词典：“APP地址”/getCustomStopDict

    dict     # 参数表示词典的词
    stop     # 表示是否停用词，停用词为True，空表示核心词典

    然后我们进入IK的配置修改配置文件，新增两个远程词典

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
        .......
          <!-- 添加如下 -->
        <!-- 远程扩展字典地址 -->
        <entry key="remote_ext_dict">http://124.71.9.101:8080/getCustomDict</entry>
        <!-- 远程停用字典地址 -->
        <entry key="remote_ext_stopwords">http://124.71.9.101:8080/getCustomStopDict</entry>
</properties>

    重启Es查看日志

[2021-01-28T09:48:40,407][INFO ][o.w.a.d.Monitor          ] [elasticsearch] try load config from /usr/share/elasticsearch/config/analysis-ik/IKAnalyzer.cfg.xml
[2021-01-28T09:48:40,522][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] /usr/share/elasticsearch/config/analysis-ik/custom/mydict.dic
[2021-01-28T09:48:40,523][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] http://124.71.9.101:8080/getCustomDict
[2021-01-28T09:48:40,531][INFO ][o.w.a.d.Monitor          ] [elasticsearch] aaa
[2021-01-28T09:48:40,532][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 黄康
[2021-01-28T09:48:40,532][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] http://124.71.9.101:8080/getCustomStopDict
[2021-01-28T09:48:40,541][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 枪支
[2021-01-28T09:48:40,542][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 仿真枪
[2021-01-28T09:48:40,542][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 重新加载词典完毕...

    我们新增一个停用词测试即可发现Es会刷新词典，1分钟左右间隔扫描一次没有修改则不会刷新词典

[2021-01-28T09:59:40,238][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 重新加载词典...
[2021-01-28T09:59:40,238][INFO ][o.w.a.d.Monitor          ] [elasticsearch] try load config from /usr/share/elasticsearch/config/analysis-ik/IKAnalyzer.cfg.xml
[2021-01-28T09:59:40,341][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] /usr/share/elasticsearch/config/analysis-ik/custom/mydict.dic
[2021-01-28T09:59:40,342][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] http://124.71.9.101:8080/getCustomDict
[2021-01-28T09:59:40,353][INFO ][o.w.a.d.Monitor          ] [elasticsearch] aaa
[2021-01-28T09:59:40,353][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 黄康
[2021-01-28T09:59:40,353][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 盖伦大宝剑
[2021-01-28T09:59:40,354][INFO ][o.w.a.d.Monitor          ] [elasticsearch] [Dict Loading] http://124.71.9.101:8080/getCustomStopDict
[2021-01-28T09:59:40,363][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 枪支
[2021-01-28T09:59:40,363][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 仿真枪
[2021-01-28T09:59:40,363][INFO ][o.w.a.d.Monitor          ] [elasticsearch] 重新加载词典完毕...