Java中对文本内容进行敏感词汇过滤的工具类
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2024-03-14 09:26:16
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import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
/**
* 铭感词过滤工具类
*
* @Author:zkx
* @date:2019年8月5日
*/
public class SensitivewordFilterUtil {
@SuppressWarnings("rawtypes")
private Map sensitiveWordMap = null;
//最小匹配规则
public static int minMatchTYpe = 1;
//最大匹配规则
public static int maxMatchType = 2;
/**
* 构造函数,初始化敏感词库
*/
public SensitivewordFilterUtil() {
sensitiveWordMap = new SensitiveWordInit().initKeyWord();
}
/**
* 判断文字是否包含敏感字符
*
* @param txt 文字
* @param matchType 匹配规则 1:最小匹配规则,2:最大匹配规则
* @return 若包含返回true,否则返回false
*/
public boolean isContaintSensitiveWord(String txt, int matchType) {
boolean flag = false;
for (int i = 0; i < txt.length(); i++) {
//判断是否包含敏感字符
int matchFlag = this.CheckSensitiveWord(txt, i, matchType);
//大于0存在,返回true
if (matchFlag > 0) {
flag = true;
}
}
return flag;
}
/**
* 获取文字中的敏感词
*
* @param txt 文字
* @param matchType 匹配规则 1:最小匹配规则,2:最大匹配规则
* @return
*/
public Set<String> getSensitiveWord(String txt, int matchType) {
Set<String> sensitiveWordList = new HashSet<String>();
for (int i = 0; i < txt.length(); i++) {
//判断是否包含敏感字符
int length = CheckSensitiveWord(txt, i, matchType);
//存在,加入list中
if (length > 0) {
sensitiveWordList.add(txt.substring(i, i + length));
//减1的原因,是因为for会自增
i = i + length - 1;
}
}
return sensitiveWordList;
}
/**
* 替换敏感字字符
*
* @param txt
* @param matchType
* @param replaceChar 替换字符,默认*
*/
public String replaceSensitiveWord(String txt, int matchType, String replaceChar) {
String resultTxt = txt;
//获取所有的敏感词
Set<String> set = getSensitiveWord(txt, matchType);
Iterator<String> iterator = set.iterator();
String word = null;
String replaceString = null;
while (iterator.hasNext()) {
word = iterator.next();
replaceString = getReplaceChars(replaceChar, word.length());
resultTxt = resultTxt.replaceAll(word, replaceString);
}
return resultTxt;
}
/**
* 获取替换字符串
*
* @param replaceChar
* @param length
* @return
*/
private String getReplaceChars(String replaceChar, int length) {
String resultReplace = replaceChar;
for (int i = 1; i < length; i++) {
resultReplace += replaceChar;
}
return resultReplace;
}
/**
* 检查文字中是否包含敏感字符,检查规则如下:<br>
*
* @param txt
* @param beginIndex
* @param matchType
* @return,如果存在,则返回敏感词字符的长度,不存在返回0
*/
@SuppressWarnings({"rawtypes"})
public int CheckSensitiveWord(String txt, int beginIndex, int matchType) {
//敏感词结束标识位:用于敏感词只有1位的情况
boolean flag = false;
//匹配标识数默认为0
int matchFlag = 0;
char word = 0;
Map nowMap = sensitiveWordMap;
for (int i = beginIndex; i < txt.length(); i++) {
word = txt.charAt(i);
//获取指定key
nowMap = (Map) nowMap.get(word);
//存在,则判断是否为最后一个
if (nowMap != null) {
//找到相应key,匹配标识+1
matchFlag++;
//如果为最后一个匹配规则,结束循环,返回匹配标识数
if ("1".equals(nowMap.get("isEnd"))) {
//结束标志位为true
flag = true;
//最小规则,直接返回,最大规则还需继续查找
if (SensitivewordFilterUtil.minMatchTYpe == matchType) {
break;
}
}
} else { //不存在,直接返回
break;
}
}
//长度必须大于等于1,为词
if (matchFlag < 2 || !flag) {
matchFlag = 0;
}
return matchFlag;
}
}