java实现屏蔽词功能

 /**  *@Description: 屏蔽词功能实现   */ package cn.yicha.novel.search.util;  import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.util.HashSet;  import cn.yicha.novel.search.config.Config;  public class Forbidden {    private static Forbidden forbidden = new Forbidden();  //屏蔽词HashSet  private HashSet<String> keyString = new HashSet<String>();  private final static int maxLength = Character.MAX_VALUE;  //屏蔽词长度HashSet数组  @SuppressWarnings("unchecked")  private HashSet<Integer>[] keyLength = new HashSet[maxLength];    private Forbidden() {   loadForbidden(Config.getClassRoot() + "forbidden.txt");  }  public static Forbidden getForbidden(){   return forbidden;  }    /**   * @param str   * @return   * @Description: 输入的字符串通过屏蔽处理，实现最大长度匹配   */  public String read(String str){   if (str == null){    return null;   }   StringBuffer stringBuffer = new StringBuffer();   int start = 0;   for (int i = 0; i < str.length();){    int at = str.charAt(i);    if (keyLength[at] == null){     i++;     continue;    } else {     int ml = 0;     for (Object obj : keyLength[at].toArray()){      int len = ((Integer)obj).intValue();      if (i + len <= str.length()){       String s = str.substring(i, i + len);       if (keyString.contains(s)){        //最大长度匹配        ml = len > ml ? len : ml;       }      }     }     if (ml > 0){      stringBuffer.append(str.substring(start, i)).append("***");      i += ml;      start = i;     } else {      i++;     }    }   }   if (start < str.length()){    stringBuffer.append(str.substring(start));   }   return stringBuffer.toString();  }    /**   * @param path   * @Description: 初始化加载屏蔽词   * @Description: 存储屏蔽词的数据格式逻辑如下   * @Description: 构建一个HashSet<String>用于存储所有的屏蔽词   * @Description: 构建长度为maxLength = Character.MAX_VALUE 的 HashSet<Integer>数组   * @Description: 将加载的屏蔽中第一个字符转化成int值，即相关信息存储在数组中的位置，   * @Description: 如“你好呀”得到'你'的int值为20320，即“你好呀”相关信息存储在数组的第20320位置   * @Description: 数组每一位存储的HashSet<Integer>结构存储在该位置的屏蔽词的长度   */  public void loadForbidden(String path){   File forbiddenFile = new File(path);   FileInputStream fileInputStream;   try {    fileInputStream = new FileInputStream(forbiddenFile);    InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "utf-8");    BufferedReader bufferedReader = new BufferedReader(inputStreamReader);    String s;    while ((s = bufferedReader.readLine()) != null){     s = s.trim();     if (s.length() > 0){      keyString.add(s);      int i = s.charAt(0);      if (keyLength[i] == null){       //屏蔽词长度HashSet       HashSet<Integer> a = new HashSet<Integer>();       a.add(s.length());       keyLength[i] = a;      } else {       keyLength[i].add(s.length());      }     }    }    fileInputStream.close();    bufferedReader.close();    fileInputStream.close();   } catch (FileNotFoundException e) {    e.printStackTrace();   } catch (IOException e) {    e.printStackTrace();   }  }   public static void main(String[] args) { //  System.out.println(Forbidden.getForbidden().read("AV女优nihao"));   int i = '你';   System.out.println(i);  } }