package com.stylefeng.guns.modular.shunfeng.util;
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import java.util.*;
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public class SensitiveWordUtil {
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/**
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* 敏感词匹配规则
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*/
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public static final int MinMatchTYpe = 1; //最小匹配规则,如:敏感词库["中国","中国人"],语句:"我是中国人",匹配结果:我是[中国]人
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public static final int MaxMatchType = 2; //最大匹配规则,如:敏感词库["中国","中国人"],语句:"我是中国人",匹配结果:我是[中国人]
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/**
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* 敏感词集合
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*/
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public static HashMap sensitiveWordMap;
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/**
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* 初始化敏感词库,构建DFA算法模型
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*
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* @param sensitiveWordSet 敏感词库
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*/
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public static synchronized void init(Set<String> sensitiveWordSet) {
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initSensitiveWordMap(sensitiveWordSet);
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}
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/**
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* 初始化敏感词库,构建DFA算法模型
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*
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* @param sensitiveWordSet 敏感词库
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*/
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private static void initSensitiveWordMap(Set<String> sensitiveWordSet) {
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//初始化敏感词容器,减少扩容操作
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sensitiveWordMap = new HashMap(sensitiveWordSet.size());
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String key;
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Map nowMap;
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Map<String, String> newWorMap;
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//迭代sensitiveWordSet
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Iterator<String> iterator = sensitiveWordSet.iterator();
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while (iterator.hasNext()) {
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//关键字
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key = iterator.next();
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nowMap = sensitiveWordMap;
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for (int i = 0; i < key.length(); i++) {
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//转换成char型
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char keyChar = key.charAt(i);
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//库中获取关键字
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Object wordMap = nowMap.get(keyChar);
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//如果存在该key,直接赋值,用于下一个循环获取
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if (wordMap != null) {
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nowMap = (Map) wordMap;
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} else {
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//不存在则,则构建一个map,同时将isEnd设置为0,因为他不是最后一个
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newWorMap = new HashMap<>();
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//不是最后一个
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newWorMap.put("isEnd", "0");
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nowMap.put(keyChar, newWorMap);
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nowMap = newWorMap;
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}
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if (i == key.length() - 1) {
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//最后一个
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nowMap.put("isEnd", "1");
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}
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}
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}
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}
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/**
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* 判断文字是否包含敏感字符
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*
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* @param txt 文字
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* @param matchType 匹配规则 1:最小匹配规则,2:最大匹配规则
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* @return 若包含返回true,否则返回false
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*/
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public static boolean contains(String txt, int matchType) {
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boolean flag = false;
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for (int i = 0; i < txt.length(); i++) {
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int matchFlag = checkSensitiveWord(txt, i, matchType); //判断是否包含敏感字符
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if (matchFlag > 0) { //大于0存在,返回true
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flag = true;
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}
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}
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return flag;
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}
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/**
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* 判断文字是否包含敏感字符
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*
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* @param txt 文字
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* @return 若包含返回true,否则返回false
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*/
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public static boolean contains(String txt) {
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return contains(txt, MinMatchTYpe);
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}
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/**
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* 获取文字中的敏感词
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*
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* @param txt 文字
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* @param matchType 匹配规则 1:最小匹配规则,2:最大匹配规则
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* @return
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*/
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public static Set<String> getSensitiveWord(String txt, int matchType) {
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Set<String> sensitiveWordList = new HashSet<>();
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for (int i = 0; i < txt.length(); i++) {
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//判断是否包含敏感字符
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int length = checkSensitiveWord(txt, i, matchType);
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if (length > 0) {//存在,加入list中
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sensitiveWordList.add(txt.substring(i, i + length));
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i = i + length - 1;//减1的原因,是因为for会自增
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}
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}
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return sensitiveWordList;
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}
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/**
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* 获取文字中的敏感词
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*
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* @param txt 文字
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* @return
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*/
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public static Set<String> getSensitiveWord(String txt) {
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return getSensitiveWord(txt, MaxMatchType);
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}
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/**
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* 替换敏感字字符
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*
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* @param txt 文本
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* @param replaceChar 替换的字符,匹配的敏感词以字符逐个替换,如 语句:我爱中国人 敏感词:中国人,替换字符:*, 替换结果:我爱***
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* @param matchType 敏感词匹配规则
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* @return
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*/
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public static String replaceSensitiveWord(String txt, char replaceChar, int matchType) {
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String resultTxt = txt;
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//获取所有的敏感词
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Set<String> set = getSensitiveWord(txt, matchType);
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Iterator<String> iterator = set.iterator();
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String word;
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String replaceString;
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while (iterator.hasNext()) {
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word = iterator.next();
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replaceString = getReplaceChars(replaceChar, word.length());
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resultTxt = resultTxt.replaceAll(word, replaceString);
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}
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return resultTxt;
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}
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/**
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* 替换敏感字字符
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*
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* @param txt 文本
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* @param replaceChar 替换的字符,匹配的敏感词以字符逐个替换,如 语句:我爱中国人 敏感词:中国人,替换字符:*, 替换结果:我爱***
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* @return
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*/
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public static String replaceSensitiveWord(String txt, char replaceChar) {
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return replaceSensitiveWord(txt, replaceChar, MaxMatchType);
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}
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/**
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* 替换敏感字字符
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*
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* @param txt 文本
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* @param replaceStr 替换的字符串,匹配的敏感词以字符逐个替换,如 语句:我爱中国人 敏感词:中国人,替换字符串:[屏蔽],替换结果:我爱[屏蔽]
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* @param matchType 敏感词匹配规则
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* @return
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*/
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public static String replaceSensitiveWord(String txt, String replaceStr, int matchType) {
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String resultTxt = txt;
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//获取所有的敏感词
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Set<String> set = getSensitiveWord(txt, matchType);
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Iterator<String> iterator = set.iterator();
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String word;
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while (iterator.hasNext()) {
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word = iterator.next();
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resultTxt = resultTxt.replaceAll(word, replaceStr);
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}
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return resultTxt;
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}
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/**
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* 替换敏感字字符
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*
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* @param txt 文本
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* @param replaceStr 替换的字符串,匹配的敏感词以字符逐个替换,如 语句:我爱中国人 敏感词:中国人,替换字符串:[屏蔽],替换结果:我爱[屏蔽]
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* @return
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*/
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public static String replaceSensitiveWord(String txt, String replaceStr) {
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return replaceSensitiveWord(txt, replaceStr, MaxMatchType);
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}
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/**
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* 获取替换字符串
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*
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* @param replaceChar
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* @param length
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* @return
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*/
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private static String getReplaceChars(char replaceChar, int length) {
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String resultReplace = String.valueOf(replaceChar);
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for (int i = 1; i < length; i++) {
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resultReplace += replaceChar;
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}
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return resultReplace;
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}
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/**
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* 检查文字中是否包含敏感字符,检查规则如下:<br>
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*
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* @param txt
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* @param beginIndex
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* @param matchType
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* @return 如果存在,则返回敏感词字符的长度,不存在返回0
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*/
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private static int checkSensitiveWord(String txt, int beginIndex, int matchType) {
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//敏感词结束标识位:用于敏感词只有1位的情况
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boolean flag = false;
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//匹配标识数默认为0
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int matchFlag = 0;
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char word;
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Map nowMap = sensitiveWordMap;
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for (int i = beginIndex; i < txt.length(); i++) {
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word = txt.charAt(i);
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//获取指定key
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nowMap = (Map) nowMap.get(word);
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if (nowMap != null) {//存在,则判断是否为最后一个
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//找到相应key,匹配标识+1
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matchFlag++;
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//如果为最后一个匹配规则,结束循环,返回匹配标识数
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if ("1".equals(nowMap.get("isEnd"))) {
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//结束标志位为true
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flag = true;
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//最小规则,直接返回,最大规则还需继续查找
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if (MinMatchTYpe == matchType) {
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break;
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}
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}
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} else {//不存在,直接返回
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break;
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}
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}
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if (matchFlag < 2 || !flag) {//长度必须大于等于1,为词
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matchFlag = 0;
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}
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return matchFlag;
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}
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}
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