JAVA过滤字符串的方法

import java.util.HashMap; /** * maxLength-需要过滤最长字符串的长度 * filterStrs-需要过滤字符串的集合，key为需要过滤字符串，value为过滤成的字符串如"*" * * @author Administrator * */ public class Test { /** * 过滤的最长字符串的长度 */ private int maxLength; /** * 需要过滤的字符串 */ private HashMap filterStrs = new HashMap(); /** * 初始化需要过滤掉*的数量 */ private String initStr(int n) { StringBuffer sb = new StringBuffer(); for (int i = 0; i < n; i++) { sb.append('*'); } return sb.toString(); } /** * str-被过滤得字符串 s-需要过滤得字符串 获得剩下未过滤的字符串 */ private String getNextStr(String str, int start, int slength) { if (start == 0) { str = str.substring(slength); } else if (start + slength < str.length()) { str = str.substring(start + slength); } return str; } /** * str-被过滤得字符串 s-需要过滤得字符串 获得过滤后的字符串 */ private StringBuffer getFilterStr(StringBuffer sb, String str, int start, String s) { if (start != 0) { sb.append(str.substring(0, start)); } sb.append(filterStrs.get(s)); return sb; } /** * str-被过滤的字符串 过滤，并组合过滤后的字符串 */ public String filter(String str) { StringBuffer resultStr = new StringBuffer(); for (int start = 0; start < str.length(); start++) { for (int end = start + 1; end <= str.length() && end <= start + maxLength; end++) { String s = str.substring(start, end); int slength = s.length(); if (filterStrs.containsKey(s)) { resultStr = getFilterStr(resultStr, str, start, s); str = getNextStr(str, start, slength); start = 0; end = start; } } } resultStr.append(str); return resultStr.toString(); } public void put(String key) { int keyLength = key.length(); filterStrs.put(key, initStr(keyLength)); if (keyLength > this.maxLength) maxLength = keyLength; } public static void main(String[] agrs) { Test t = new Test(); t.put("TMD"); t.put("TNND"); t.put("操"); t.put("NND"); System.out.println(t.filter("TMD,操，TNND.操..TMDTMDTMDTMD.tTNND.操TMDTNNDTNNDTNND操")); } }