SpringBoot 热搜与不雅文字过滤的实现
一、前言
这里主要讲springboot整合redis的个人搜索记录与热搜、敏感词过滤与替换两个功能,下面进行环境准备,引入相关maven依赖
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-redis -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<version>2.7.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
application.yml配置为
spring:
redis:
#数据库索引
database: 0
host: 192.168.31.28
port: 6379
password: 123456
lettuce:
pool:
#最大连接数
max-active: 8
#最大阻塞等待时间(负数表示没限制)
max-wait: -1
#最大空闲
max-idle: 8
#最小空闲
min-idle: 0
#连接超时时间
timeout: 10000
最后敏感词文本文件放在resources/static目录下,取名为word.txt,敏感词文本网上很多,这里就随便贴一个:github敏感词
二、不雅文字过滤
1、实现原理
简单原理如下图所示,使用了DFA算法,创建结点类,里面包含是否是敏感词结束符,以及一个HashMap,哈希里key值存储的是敏感词的一个词,value指向下一个结点(即指向下一个词),一个哈希表中可以存放多个值,比如赌博、赌黄这两个都是敏感词。
2、实现方法
2.1 敏感词库初始化
敏感词库的初始化,这里主要工作是读取敏感词文件,在内存中构建好敏感词的Map节点
@Configuration
@SuppressWarnings({ "rawtypes", "unchecked" })
public class SensitiveWordInit {
// 字符编码
private String ENCODING = "UTF-8";
// 初始化敏感字库
public Map initKeyWord() throws IOException {
// 读取敏感词库 ,存入Set中
Set<String> wordSet = readSensitiveWordFile();
// 将敏感词库加入到HashMap中//确定有穷自动机DFA
return addSensitiveWordToHashMap(wordSet);
}
// 读取敏感词库 ,存入HashMap中
private Set<String> readSensitiveWordFile() throws IOException {
Set<String> wordSet = null;
ClassPathResource classPathResource = new ClassPathResource("static/word.txt");
InputStream inputStream = classPathResource.getInputStream();
//敏感词库
try {
// 读取文件输入流
InputStreamReader read = new InputStreamReader(inputStream, ENCODING);
// 文件是否是文件 和 是否存在
wordSet = new HashSet<String>();
// StringBuffer sb = new StringBuffer();
// BufferedReader是包装类,先把字符读到缓存里,到缓存满了,再读入内存,提高了读的效率。
BufferedReader br = new BufferedReader(read);
String txt = null;
// 读取文件,将文件内容放入到set中
while ((txt = br.readLine()) != null) {
wordSet.add(txt);
}
br.close();
// 关闭文件流
read.close();
} catch (Exception e) {
e.printStackTrace();
}
return wordSet;
}
// 将HashSet中的敏感词,存入HashMap中
private Map addSensitiveWordToHashMap(Set<String> wordSet) {
// 初始化敏感词容器,减少扩容操作
Map wordMap = new HashMap(wordSet.size());
for (String word : wordSet) {
Map nowMap = wordMap;
for (int i = 0; i < word.length(); i++) {
// 转换成char型
char keyChar = word.charAt(i);
// 获取
Object tempMap = nowMap.get(keyChar);
// 如果存在该key,直接赋值
if (tempMap != null) {
nowMap = (Map) tempMap;
}
// 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
else {
// 设置标志位
Map<String, String> newMap = new HashMap<String, String>();
newMap.put("isEnd", "0");
// 添加到集合
nowMap.put(keyChar, newMap);
nowMap = newMap;
}
// 最后一个
if (i == word.length() - 1) {
nowMap.put("isEnd", "1");
}
}
}
return wordMap;
}
}
2.2 敏感词过滤器
敏感词过滤器,主要功能是初始化敏感词库,敏感词的过滤以及替换
@Component
public class SensitiveFilter {
private Map sensitiveWordMap = null;
public static int minMatchType = 1;
public static int maxMatchType = 2;
public static String placeHolder = "**";
// 单例
private static SensitiveFilter instance = null;
private SensitiveFilter() throws IOException {
sensitiveWordMap = new SensitiveWordInit().initKeyWord();
}
public static SensitiveFilter getInstance() throws IOException {
if (null == instance) {
instance = new SensitiveFilter();
}
return instance;
}
public Set<String> getSensitiveWord(String txt, int matchType) {
Set<String> sensitiveWordList = new HashSet<>();
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;
}
public String replaceSensitiveWord(String txt) {
return replaceSensitiveWord(txt, minMatchType ,placeHolder);
}
public String replaceSensitiveWord(String txt, int matchType) {
return replaceSensitiveWord(txt, matchType,placeHolder);
}
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;
}
private String getReplaceChars(String replaceChar, int length) {
StringBuilder resultReplace = new StringBuilder(replaceChar);
for (int i = 1; i < length; i++) {
resultReplace.append(replaceChar);
}
return resultReplace.toString();
}
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的情况结束
boolean flag = false;
// 匹配标识数默认为0
int matchFlag = 0;
Map nowMap = sensitiveWordMap;
for (int i = beginIndex; i < txt.length(); i++) {
char 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 (SensitiveFilter.minMatchType == matchType) {
break;
}
}
}
// 不存在,直接返回
else {
break;
}
}
// 匹配长度如果匹配上了最小匹配长度或者最大匹配长度
if (SensitiveFilter.maxMatchType == matchType || SensitiveFilter.minMatchType == matchType){
//长度必须大于等于1,为词,或者敏感词库还没有结束(匹配了一半),flag为false
if(matchFlag < 2 || !flag){
matchFlag = 0;
}
}
return matchFlag;
}
}
2.3 测试使用
最后进行测试,这里有两种方式可以获取,因为容器初始化时会默认执行无参构造
@RestController
public class SensitiveController {
private static Logger logger = LoggerFactory.getLogger(SensitiveController.class);
@Autowired
SensitiveFilter sensitiveFilter;
@GetMapping("/sensitive")
public String sensitive(String keyword){
String s = sensitiveFilter.replaceSensitiveWord(keyword);
return s;
}
// 两种方式都可以
public static void main(String[] args) throws IOException {
String searchKey = "傻逼h";
String placeholder = "***";
//非法敏感词汇判断
SensitiveFilter filter = SensitiveFilter.getInstance();
String s = filter.replaceSensitiveWord(searchKey, 1, placeholder);
System.out.println(s);
int n = filter.CheckSensitiveWord(searchKey,0,2);
//存在非法字符
if(n > 0){
logger.info("这个人输入了非法字符--> {},不知道他到底要查什么~ userid--> {}",searchKey,1);
}
}
}
三、Redis搜索栏热搜
1、前言
使用java和redis实现一个简单的热搜功能,具备以下功能:
- 搜索栏展示当前登陆的个人用户的搜索历史记录,删除个人历史记录
- 用户在搜索栏输入某字符,则将该字符记录下来 以zset格式存储的redis中,记录该字符被搜索的个数以及当前的时间戳 (用了DFA算法)
- 每当用户查询了已在redis存在了的字符时,则直接累加个数, 用来获取平台上最热查询的十条数据。(可以自己写接口或者直接在redis中添加一些预备好的关键词)
- 最后还要做不雅文字过滤功能。
代码实现热搜与个人搜索记录功能,主要controller层下几个方法就行了 :
- 向redis 添加热搜词汇(添加的时候使用下面不雅文字过滤的方法来过滤下这个词汇,合法再去存储
- 每次点击给相关词热度 +1
- 根据key搜索相关最热的前十名
- 插入个人搜索记录
- 查询个人搜索记录
2、代码实现
2.1 创建RedisKeyUtils 工具类
管理redis的键,防止太乱了
public class RedisKeyUtils {
private static final String SPLIT = ":";
private static final String SEARCH = "search";
private static final String SEARCH_HISTORY = "search-history";
private static final String HOT_SEARCH = "hot-search";
private static final String SEARCH_TIME = "search-time";
public static String getSearchHistoryKey(String userId){
return SEARCH + SPLIT + SEARCH_HISTORY + SPLIT + userId;
}
public static String getHotSearchKey(){
return SEARCH + SPLIT + HOT_SEARCH;
}
public static String getSearchTimeKey(String searchKey){
return SEARCH + SPLIT + SEARCH_TIME + SPLIT + searchKey;
}
}
2.2 核心搜索文件
两个文件是一起的
@Service("redisService")
public class RedisService {
private Logger logger = LoggerFactory.getLogger(RedisService.class);
private static final Integer HOT_SEARCH_NUMBER = 9;
private static final Long HOT_SEARCH_TIME = 30 * 24 * 60 * 60L;
@Resource
private StringRedisTemplate redisSearchTemplate;
public Long addSearchHistoryByUserId(String userId, String searchKey) {
try{
String redisKey = RedisKeyUtils.getSearchHistoryKey(userId);
// 如果存在这个key
boolean b = Boolean.TRUE.equals(redisSearchTemplate.hasKey(redisKey));
if (b) {
// 获取这个关键词hash的值,有就返回,没有就新增
Object hk = redisSearchTemplate.opsForHash().get(redisKey, searchKey);
if (hk != null) {
return 1L;
}else{
redisSearchTemplate.opsForHash().put(redisKey, searchKey, "1");
}
}else{
// 没有这个关键词就新增
redisSearchTemplate.opsForHash().put(redisKey, searchKey, "1");
}
return 1L;
}catch (Exception e){
logger.error("redis发生异常,异常原因:",e);
return 0L;
}
}
public Long delSearchHistoryByUserId(String userId, String searchKey) {
try {
String redisKey = RedisKeyUtils.getSearchHistoryKey(userId);
// 删除这个用户的关键词记录
return redisSearchTemplate.opsForHash().delete(redisKey, searchKey);
}catch (Exception e){
logger.error("redis发生异常,异常原因:",e);
return 0L;
}
}
public List<String> getSearchHistoryByUserId(String userId) {
try{
List<String> stringList = null;
String redisKey = RedisKeyUtils.getSearchHistoryKey(userId);
// 判断存不存在
boolean b = Boolean.TRUE.equals(redisSearchTemplate.hasKey(redisKey));
if(b){
stringList = new ArrayList<>();
// 逐个扫描,ScanOptions.NONE为获取全部键对,ScanOptions.scanOptions().match("map1").build() 匹配获取键位map1的键值对,不能模糊匹配
Cursor<Map.Entry<Object, Object>> cursor = redisSearchTemplate.opsForHash().scan(redisKey, ScanOptions.NONE);
while (cursor.hasNext()) {
Map.Entry<Object, Object> map = cursor.next();
String key = map.getKey().toString();
stringList.add(key);
}
return stringList;
}
return null;
}catch (Exception e){
logger.error("redis发生异常,异常原因:",e);
return null;
}
}
public List<String> getHotList(String searchKey) {
try {
Long now = System.currentTimeMillis();
List<String> result = new ArrayList<>();
ZSetOperations<String, String> zSetOperations = redisSearchTemplate.opsForZSet();
ValueOperations<String, String> valueOperations = redisSearchTemplate.opsForValue();
Set<String> value = zSetOperations.reverseRangeByScore(RedisKeyUtils.getHotSearchKey(), 0, Double.MAX_VALUE);
//key不为空的时候 推荐相关的最热前十名
if(StringUtils.isNotEmpty(searchKey)){
for (String val : value) {
if (StringUtils.containsIgnoreCase(val, searchKey)) {
//只返回最热的前十名
if (result.size() > HOT_SEARCH_NUMBER) {
break;
}
Long time = Long.valueOf(Objects.requireNonNull(valueOperations.get(val)));
//返回最近一个月的数据
if ((now - time) < HOT_SEARCH_TIME) {
result.add(val);
} else {//时间超过一个月没搜索就把这个词热度归0
zSetOperations.add(RedisKeyUtils.getHotSearchKey(), val, 0);
}
}
}
}else{
for (String val : value) {
//只返回最热的前十名
if (result.size() > HOT_SEARCH_NUMBER) {
break;
}
Long time = Long.valueOf(Objects.requireNonNull(valueOperations.get(val)));
//返回最近一个月的数据
if ((now - time) < HOT_SEARCH_TIME) {
result.add(val);
} else {
//时间超过一个月没搜索就把这个词热度归0
zSetOperations.add(RedisKeyUtils.getHotSearchKey(), val, 0);
}
}
}
return result;
}catch (Exception e){
logger.error("redis发生异常,异常原因:",e);
return null;
}
}
}
接上一个
@Service("redisService")
public class RedisService {
private Logger logger = LoggerFactory.getLogger(RedisService.class);
@Resource
private StringRedisTemplate redisSearchTemplate;
public int incrementScoreByUserId(String searchKey) {
Long now = System.currentTimeMillis();
ZSetOperations<String, String> zSetOperations = redisSearchTemplate.opsForZSet();
ValueOperations<String, String> valueOperations = redisSearchTemplate.opsForValue();
List<String> title = new ArrayList<>();
title.add(searchKey);
for (int i = 0, length = title.size(); i < length; i++) {
String tle = title.get(i);
try {
if (zSetOperations.score(RedisKeyUtils.getHotSearchKey(), tle) <= 0) {
zSetOperations.add(RedisKeyUtils.getHotSearchKey(), tle, 0);
valueOperations.set(RedisKeyUtils.getSearchTimeKey(tle), String.valueOf(now));
}
} catch (Exception e) {
zSetOperations.add(RedisKeyUtils.getHotSearchKey(), tle, 0);
valueOperations.set(RedisKeyUtils.getSearchTimeKey(tle), String.valueOf(now));
}
}
return 1;
}
public Long incrementScore(String searchKey) {
try{
Long now = System.currentTimeMillis();
ZSetOperations<String, String> zSetOperations = redisSearchTemplate.opsForZSet();
ValueOperations<String, String> valueOperations = redisSearchTemplate.opsForValue();
// 没有的话就插入,有的话的直接更新;add是有就覆盖,没有就插入
zSetOperations.incrementScore(RedisKeyUtils.getHotSearchKey(), searchKey, 1);
valueOperations.getAndSet(RedisKeyUtils.getSearchTimeKey(searchKey), String.valueOf(now));
return 1L;
}catch (Exception e){
logger.error("redis发生异常,异常原因:",e);
return 0L;
}
}
}
2.3 测试使用
以下只是简单的测试,上面的核心函数可以自己组合,一般组合加上敏感词过滤
@RestController
public class SearchHistoryController {
@Autowired
RedisService redisService;
@GetMapping("/add")
public String addSearchHistoryByUserId(String userId, String searchKey) {
redisService.addSearchHistoryByUserId(userId, searchKey);
redisService.incrementScore(searchKey);
return null;
}
@GetMapping("/del")
public Long delSearchHistoryByUserId(String userId, String searchKey) {
return redisService.delSearchHistoryByUserId(userId, searchKey);
}
@GetMapping("/getUser")
public List<String> getSearchHistoryByUserId(String userId) {
return redisService.getSearchHistoryByUserId(userId);
}
@GetMapping("/getHot")
public List<String> getHotList(String searchKey) {
return redisService.getHotList(searchKey);
}
}
参考文章
Redis6.0学习笔记
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