/*** @date 2020-12-09 009 19:36*/

public classSensitiveWordsSearch {/*** 關鍵字根節(jié)點*/

protectedWordsNode rootNode;/*** 所有關鍵字*/

protected ListsensitiveWordsList;/*** 關鍵字加載中*/

protected booleankeywordsLoading;privateSensitiveWordsSearch() {

}/*** 獲取實例

*

*@returnSensitiveWordsSearch*/

public staticSensitiveWordsSearch getInstance() {returnSensitiveWordsSearchInstance.INSTANCE;

}/*** 初始化關鍵字*/

private voidinitKeywords() {//初始化

rootNode = newWordsNode();for(SensitiveWords sensitiveWords : sensitiveWordsList) {

WordsNode node=rootNode;

String words=sensitiveWords.getWords();int length =words.length();for (int i = 0; i < length; i++) {

node=node.add(words.charAt(i));if (node.getLayer() == 0) {

node.setLayer(i+ 1);

}

}

node.setEnd(true);

node.setId(sensitiveWords.getId());

}

System.out.println(JSON.toJSONString(rootNode));

}/*** 更新關鍵字

*

*@paramsensitiveWordsList 關鍵字集合*/

public void updateKeywords(ListsensitiveWordsList) {if (!this.keywordsLoading) {this.keywordsLoading = true;this.sensitiveWordsList =sensitiveWordsList;this.initKeywords();this.keywordsLoading = false;

}

}/*** 獲取關鍵字

*

*@paramtext 檢索文本

*@parammaxMatch 最大匹配

*@return查找到的關鍵字*/

public List findWords(String text, booleanmaxMatch) {if (null ==rootNode) {throw new RuntimeException("SensitiveWordsSearch uninitialized.");

}

WordsNode top= null;

List list = new ArrayList<>();

WordsNode preNode= null;int length =text.length();int lastLength = length - 1;for (int i = 0; i < length; i++) {final char t =text.charAt(i);

WordsNode node;if (top == null) {

node=rootNode.getNode(t);

}else{if(top.hasKey(t)) {

node=top.getNode(t);

}else{if (maxMatch &&top.isEnd()) {

preNode=top;

}

node=rootNode.getNode(t);

}

}if(maxMatch) {//下一個節(jié)點

if (preNode != null) {//計算層級向前

list.add(new SearchNode(preNode.getWords(), i -preNode.getLayer(), i, preNode.getId()));

preNode= null;

}

}else{//當前節(jié)點

if (node != null &&node.isEnd()) {

list.add(new SearchNode(node.getWords(), i + 1 - node.getLayer(), i + 1, node.getId()));

}

}//最大匹配時修正最后一個文本無法匹配的問題

if (lastLength == i && maxMatch && node != null &&node.isEnd()) {//當前節(jié)點//最后匹配

list.add(new SearchNode(node.getWords(), i + 1 - node.getLayer(), i + 1, node.getId()));

}

top=node;

}returnlist;

}/*** 靜態(tài)內部類*/

private static classSensitiveWordsSearchInstance {/*** 實例對象*/

private static final SensitiveWordsSearch INSTANCE = newSensitiveWordsSearch();

}

}

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