Java实战之敏感词过滤器

		org.springframework.boot
		spring-boot-starter-aop



		org.springframework.boot
		spring-boot-starter-thymeleaf



		org.springframework.boot
		spring-boot-starter-web



		org.springframework.boot
		spring-boot-devtools
		runtime



		org.springframework.boot
		spring-boot-starter-test
		test



		org.apache.commons
		commons-lang3
		3.9

 //前缀树
    private class TrieNode{
        //关键词结束标识
        private boolean isKeywordEnd = false;

        //子节点
        private Map subNodes = new HashMap<>();
		
		//isKeywordEnd的get、set方法
        public boolean isKeywordEnd() {
            return isKeywordEnd;
        }

        public void setKeywordEnd(boolean keywordEnd) {
            isKeywordEnd = keywordEnd;
        }

        //添加子节点
        public void addSubNode(Character c,TrieNode node){
            subNodes.put(c,node);
        }

        //获取子节点
        public TrieNode getSubNode(Character c){
            return subNodes.get(c);
        }
    }

@Component
public class SensitiveFilter {
    // 替换符
    private static final String REPLACEMENT = "***";

    //根节点
    private TrieNode rootNode = new TrieNode();

    //bean的初始化方法，服务一启动，容器自动给bean执行此方法完成初始化
    //此方法的目的是读取敏感词文件，构建敏感词前缀树
    @PostConstruct
    public void init(){
        try(
                InputStream is = this.getClass().getClassLoader().getResourceAsStream("sensitive-words.txt");
                BufferedReader reader = new BufferedReader(new InputStreamReader(is));
                ){
            String keyword;
            while((keyword=reader.readLine())!=null){
                this.addKeyword(keyword);
            }
        }catch (IOException e){
            logger.error("加载敏感词文件失败: " + e.getMessage());
        }
    }
    
    //将一个敏感词添加到前缀树
    private void addKeyword(String keyword){
        TrieNode tempNode = rootNode;
        for (int i = 0; i  0x9FFF);
    }
}