java自定义过滤敏感词

import java.util.HashMap;
import java.util.Map;

public class KeyWordFilterServiceImpl {
	private static final char endTag = (char) (1); // 关键词结束符
	private static Map filterMap = new HashMap(
			1024);
	public  void init() {
		// TODO:加载过滤词库，可以使简单的在数组里也可以从数据库中获得，为了简单暂且就先 这么写吧
		String[] filterWordList = new String[] { "tmd", "nm", "fuck" };

		for (String filterWord : filterWordList) {
			char[] charArray = filterWord.trim().toCharArray();
			
			int len = charArray.length;
			if (len > 0) {
				Map subMap = filterMap;
				for (int i = 0; i < len - 1; i++) {
					@SuppressWarnings("unchecked")
					Map obj = subMap.get(charArray[i]);
					if (obj == null) {
						// 新索引，增加HashMap
						int size = (int) Math.max(2, 16 / Math.pow(2, i));
						HashMap subMapTmp = new HashMap(
								size);
						subMap.put(charArray[i], subMapTmp);
						subMap = subMapTmp;
					} else {
						// 索引已经存在
						subMap = obj;
					}
				}
				// 处理最后一个字符
				Map obj = subMap.get(charArray[len - 1]);
				if (obj == null) {
					// 新索引，增加HashMap，并设置结束符
					int size = (int) Math.max(2, 16 / Math.pow(2, len - 1));
					HashMap subMapTmp = new HashMap(
							size);
					subMapTmp.put(endTag, null);
					subMap.put(charArray[len - 1], subMapTmp);
				} else {
					// 索引已经存在,设置结束符
					obj.put(endTag, null);
				}
			}
		}
	}
	// 返回是否包含需要过滤的词,匹配到最短的关键词就返回结果
	@SuppressWarnings("unchecked")
	public static boolean isHasFilterWord(String info) {
		if (info == null || info.length() == 0) {
			
			return false;	
	}
	char[] charArray = info.toCharArray();
	int len = charArray.length;
	System.out.println("-----------"+len);
	for (int i = 0; i < len; i++) {
		int index = i;
		Map sub = filterMap.get(charArray[index]);
		
		System.out.println(charArray[index]+"------------------------------");
		while (sub != null) {
			if (sub.containsKey(endTag)) {
				// 匹配结束								
				return true;
			} else {
				index++;
				if (index >= len) {
					// 字符串结束
					return false;
				}
				sub = sub.get(charArray[index]);
			}
		}
	}
	return false;
}

// 将字符串中包含的关键字过滤并替换为*，然后退回替换后的字符串
public static String getFilterString(String info) {
	return getFilterString(info, "*");
}
// 将字符串中包含的关键词过滤并替换为指定字符串，然后退回替换后的字符串
// 尽量匹配最长的关键词再替换，关键词最长不超过maxKeyWordLen
@SuppressWarnings("unchecked")
public static String getFilterString(String info, String replaceTag) {
	if (info == null || info.length() == 0 || replaceTag == null
			|| replaceTag.length() == 0) {
		return info;
	}
	char[] charArray = info.toCharArray();
	int len = charArray.length;
	String newInfo = "";
	int i = 0;
	while (i < len) {
		int end = -1;
		int index;
		Map sub = filterMap;
		for (index = i; index < len; index++) {			
			sub = sub.get(charArray[index]);
			if (sub == null) {
				// 匹配失败，将已匹配的最长字符进行替换
				if (end == -1) {
					// 没匹配到任何关键词
					newInfo += charArray[i];
					i++;
					break;
				} else {
					// 将最长匹配字符串替换为特定字符
					for (int j = i; j <= end; j++) {
						newInfo += replaceTag;
					}
					i = end + 1;
					break;
				}
			} else {
				if (sub.containsKey(endTag)) {
					// 匹配
					end = index;
				}
			}
		}
		if (index >= len) {
			// 字符串结束
			if (end == -1) {
				// 没匹配到任何关键词
				newInfo += charArray[i];
				i++;
			} else {
				// 将最长匹配字符串替换为特定字符
				for (int j = i; j <= end; j++) {
					newInfo += replaceTag;
				}
				i = end + 1;
			}
		}
	}
	return newInfo;
}

}

当时不知道哪里抄的，后面找到了附上链接，对不住了！