HanLP无法动态加载停用词，无法重载停用词的自定义处理

╰+哭是因爲堅強的太久メ 2022-04-10 03:14 476阅读 0赞

在使用HanLP框架的过程中，发现其内置的CoreStopWordDictionary类只有删除、添加方法，没有动态的重载。而项目的需求确实可以动态加载，用他内置的方法去全删掉，然后一个个添加，在直观上感觉没有那么优美。。。所以准备重新写一个服务在做停用词的加载。  
新建服务类：

CoreStopwordService

首先，HanLP的停用词记载是从其资源包中的stopword.txt下读取的数据加载，其加载方法在CoreStopWordDictionary的static静态块中存在：

static {
            ByteArray byteArray = ByteArray.createByteArray(Config.CoreStopWordDictionaryPath + ".bin");
            if (byteArray == null) {
                try {
                    dictionary = new StopWordDictionary(Config.CoreStopWordDictionaryPath);
                    DataOutputStream out = new DataOutputStream(IOUtil.newOutputStream(Config.CoreStopWordDictionaryPath + ".bin"));
                    dictionary.save(out);
                    out.close();
                } catch (Exception var2) {
                    Predefine.logger.severe("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败" + TextUtility.exceptionToString(var2));
                    throw new RuntimeException("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败");
                }
            } else {
                dictionary = new StopWordDictionary();
                dictionary.load(byteArray);
            }
    
            FILTER = new Filter() {
                public boolean shouldInclude(Term term) {
                    String nature = term.nature != null ? term.nature.toString() : "空";
                    char firstChar = nature.charAt(0);
                    switch(firstChar) {
                    case 'b':
                    case 'c':
                    case 'e':
                    case 'm':
                    case 'o':
                    case 'p':
                    case 'q':
                    case 'r':
                    case 'u':
                    case 'w':
                    case 'y':
                    case 'z':
                        return false;
                    case 'd':
                    case 'f':
                    case 'g':
                    case 'h':
                    case 'i':
                    case 'j':
                    case 'k':
                    case 'l':
                    case 'n':
                    case 's':
                    case 't':
                    case 'v':
                    case 'x':
                    default:
                        return !CoreStopWordDictionary.contains(term.word);
                    }
                }
            };
        }

将其改成在新服务的PostConstruct中加载：

@PostConstruct
      public void load() {
    
        ByteArray byteArray = ByteArray.createByteArray(Config.CoreStopWordDictionaryPath + ".bin");
        if (byteArray == null) {
          try {
            if (Files.size(Paths.get(Config.CoreStopWordDictionaryPath)) == 0){
              return ;
            }
            dictionary = new StopWordDictionary(Config.CoreStopWordDictionaryPath);
            DataOutputStream out = new DataOutputStream(IOUtil.newOutputStream(Config.CoreStopWordDictionaryPath + ".bin"));
            dictionary.save(out);
            out.close();
          } catch (Exception var2) {
            Predefine.logger.severe("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败" + TextUtility.exceptionToString(var2));
            throw new RuntimeException("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败");
          }
        } else {
          dictionary = new StopWordDictionary();
          dictionary.load(byteArray);
        }
      }

其他方法不变，再添加一个reload方法：

@Transactional(readOnly = true)
      public void reload() {
        log.info("开始重新加载停用词库...");
        try (Stream<Stopword> stream = stopwordRepository.findByProject_Id(customDictionaryService.getEffectiveProjectId())){
          String text = stream.map(Stopword::getWord).collect(Collectors.joining("\n"));
          if (StringUtils.isEmpty(text)){
            log.info("停用词库为空，停止加载");
            return ;
          }
          try {
            Files.write(Paths.get(Config.CoreStopWordDictionaryPath),text.getBytes());
          } catch (IOException e) {
            e.printStackTrace();
          }
        }
        try {
          Files.delete(Paths.get(Config.CoreStopWordDictionaryPath + ".bin"));
        } catch (IOException e) {
          e.printStackTrace();
        }
        load();
        log.info("停用词库加载完成...");
      }

`stopwordRepository.findByProject_Id(customDictionaryService.getEffectiveProjectId()))`这个是我用jpa的记载数据的方法，这里可以替换成你项目中的数据查询方法。  
这样就可以在项目中任何位置重载停用词了。  
CoreStopwordService的完整代码如下：

/**
     * @description: 自定义停用词服务
     * @author: chenyang
     * @create: 2018-12-14
     **/
    @Slf4j
    @Service
    public class CoreStopwordService {
    
      static StopWordDictionary dictionary;
      public static Filter FILTER;
      public final StopwordRepository stopwordRepository;
      private final CustomDictionaryService customDictionaryService;
    
      public CoreStopwordService(StopwordRepository stopwordRepository, CustomDictionaryService customDictionaryService) {
        this.stopwordRepository = stopwordRepository;
        this.customDictionaryService = customDictionaryService;
      }
    
      static {
        FILTER = new Filter() {
          public boolean shouldInclude(Term term) {
            String nature = term.nature != null ? term.nature.toString() : "空";
            char firstChar = nature.charAt(0);
            switch(firstChar) {
              case 'b':
              case 'c':
              case 'e':
              case 'm':
              case 'o':
              case 'p':
              case 'q':
              case 'r':
              case 'u':
              case 'w':
              case 'y':
              case 'z':
                return false;
              case 'd':
              case 'f':
              case 'g':
              case 'h':
              case 'i':
              case 'j':
              case 'k':
              case 'l':
              case 'n':
              case 's':
              case 't':
              case 'v':
              case 'x':
              default:
                return !CoreStopWordDictionary.contains(term.word);
            }
          }
        };
      }
    
      @Transactional(readOnly = true)
      public void reload() {
        log.info("开始重新加载停用词库...");
        try (Stream<Stopword> stream = stopwordRepository.findByProject_Id(customDictionaryService.getEffectiveProjectId())){
          String text = stream.map(Stopword::getWord).collect(Collectors.joining("\n"));
          if (StringUtils.isEmpty(text)){
            log.info("停用词库为空，停止加载");
            return ;
          }
          try {
            Files.write(Paths.get(Config.CoreStopWordDictionaryPath),text.getBytes());
          } catch (IOException e) {
            e.printStackTrace();
          }
        }
        try {
          Files.delete(Paths.get(Config.CoreStopWordDictionaryPath + ".bin"));
        } catch (IOException e) {
          e.printStackTrace();
        }
        load();
        log.info("停用词库加载完成...");
      }
    
      public static boolean contains(String key) {
          return dictionary.contains(key);
      }
    
      public static boolean shouldInclude(Term term) {
          return FILTER.shouldInclude(term);
      }
    
      public static boolean shouldRemove(Term term) {
          return !shouldInclude(term);
      }
    
      public static boolean add(String stopWord) {
          return dictionary.add(stopWord);
      }
    
      public static boolean remove(String stopWord) {
          return dictionary.remove(stopWord);
      }
    
      public static void apply(List<Term> termList) {
          ListIterator listIterator = termList.listIterator();
    
          while(listIterator.hasNext()) {
              if (shouldRemove((Term)listIterator.next())) {
                  listIterator.remove();
              }
          }
    
      }
    
      @PostConstruct
      public void load() {
    
        ByteArray byteArray = ByteArray.createByteArray(Config.CoreStopWordDictionaryPath + ".bin");
        if (byteArray == null) {
          try {
            if (Files.size(Paths.get(Config.CoreStopWordDictionaryPath)) == 0){
              return ;
            }
            dictionary = new StopWordDictionary(Config.CoreStopWordDictionaryPath);
            DataOutputStream out = new DataOutputStream(IOUtil.newOutputStream(Config.CoreStopWordDictionaryPath + ".bin"));
            dictionary.save(out);
            out.close();
          } catch (Exception var2) {
            Predefine.logger.severe("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败" + TextUtility.exceptionToString(var2));
            throw new RuntimeException("载入停用词词典" + Config.CoreStopWordDictionaryPath + "失败");
          }
        } else {
          dictionary = new StopWordDictionary();
          dictionary.load(byteArray);
        }
      }
    }