string 过滤 html 标签
package com.linkage.util;import java.util.regex.Matcher; import java.util.regex.Pattern; /** * <p> * Title: HTML相关的正则表达式工具类 * </p> * <p> * Description: 包括过滤HTML标记，转换HTML标记，替换特定HTML标记 * </p> * <p> * Copyright: Copyright (c) 2006 * </p> * * @author chengRenYin * @version 1.0 * @createtime 2010-1-27 */ public class HtmlRegexpUtil { private final static String regxpForHtml = "<([^>]*)>"; // 过滤所有以<开头以>结尾的标签 private final static String regxpForImgTag = "<\\s*img\\s+([^>]*)\\s*>"; // 找出IMG标签 private final static String regxpForImaTagSrcAttrib = "src=\"([^\"]+)\""; // 找出IMG标签的SRC属性 /** * */ public HtmlRegexpUtil() { // TODO Auto-generated constructor stub } /** * * 基本功能：替换标记以正常显示 * <p> * * @param input * @return String */ public String replaceTag(String input) { if (!hasSpecialChars(input)) { return input; } StringBuffer filtered = new StringBuffer(input.length()); char c; for (int i = 0; i <= input.length() - 1; i++) { c = input.charAt(i); switch (c) { case '<': filtered.append("&lt;"); break; case '>': filtered.append("&gt;"); break; case '"': filtered.append("&quot;"); break; case '&': filtered.append("&amp;"); break; default: filtered.append(c); } } return (filtered.toString()); } /** * * 基本功能：判断标记是否存在 * <p> * * @param input * @return boolean */ public boolean hasSpecialChars(String input) { boolean flag = false; if ((input != null) && (input.length() > 0)) { char c; for (int i = 0; i <= input.length() - 1; i++) { c = input.charAt(i); switch (c) { case '>': flag = true; break; case '<': flag = true; break; case '"': flag = true; break; case '&': flag = true; break; } } } return flag; } /** * * 基本功能：过滤所有以"<"开头以">"结尾的标签 * <p> * * @param str * @return String */ public static String filterHtml(String str) { Pattern pattern = Pattern.compile(regxpForHtml); Matcher matcher = pattern.matcher(str); StringBuffer sb = new StringBuffer(); boolean result1 = matcher.find(); while (result1) { matcher.appendReplacement(sb, ""); result1 = matcher.find(); } matcher.appendTail(sb); return sb.toString(); } /** * * 基本功能：过滤指定标签 * <p> * * @param str * @param tag * 指定标签 * @return String */ public static String fiterHtmlTag(String str, String tag) { String regxp = "<\\s*" + tag + "\\s+([^>]*)\\s*>"; Pattern pattern = Pattern.compile(regxp); Matcher matcher = pattern.matcher(str); StringBuffer sb = new StringBuffer(); boolean result1 = matcher.find(); while (result1) { matcher.appendReplacement(sb, ""); result1 = matcher.find(); } matcher.appendTail(sb); return sb.toString(); } /** * * 基本功能：替换指定的标签 * <p> * * @param str * @param beforeTag * 要替换的标签 * @param tagAttrib * 要替换的标签属性值 * @param startTag * 新标签开始标记 * @param endTag * 新标签结束标记 * @return String * @如：替换img标签的src属性值为属性值 */ public static String replaceHtmlTag(String str, String beforeTag, String tagAttrib, String startTag, String endTag) { String regxpForTag = "<\\s*" + beforeTag + "\\s+([^>]*)\\s*>"; String regxpForTagAttrib = tagAttrib + "=\"([^\"]+)\""; Pattern patternForTag = Pattern.compile(regxpForTag); Pattern patternForAttrib = Pattern.compile(regxpForTagAttrib); Matcher matcherForTag = patternForTag.matcher(str); StringBuffer sb = new StringBuffer(); boolean result = matcherForTag.find(); while (result) { StringBuffer sbreplace = new StringBuffer(); Matcher matcherForAttrib = patternForAttrib.matcher(matcherForTag .group(1)); if (matcherForAttrib.find()) { matcherForAttrib.appendReplacement(sbreplace, startTag + matcherForAttrib.group(1) + endTag); } matcherForTag.appendReplacement(sb, sbreplace.toString()); result = matcherForTag.find(); } matcherForTag.appendTail(sb); return sb.toString(); } }string 过滤 html 标签
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