Java正则表达式过滤html标签

Dear 丶 2022-06-03 04:59 294阅读 0赞

原文：[http://cooler1217.iteye.com/blog/1233670][http_cooler1217.iteye.com_blog_1233670]

import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 /**
 * 
 * Title: HTML相关的正则表达式工具类
 * 
 * 
 * Description: 包括过滤HTML标记，转换HTML标记，替换特定HTML标记
 * 
 * 
 * Copyright: Copyright (c) 2006
 * 
 *
 * @author hejian
 * @version 1.0
 * @createtime 2006-10-16
 */
 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
 * 
 *
 * @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("<");
 break;
 case '>':
 filtered.append(">");
 break;
 case '"':
 filtered.append(""");
 break;
 case '&':
 filtered.append("&");
 break;
 default:
 filtered.append(c);
 }
 }
 return (filtered.toString());
 }
 /**
 *
 * 基本功能：判断标记是否存在
 * 
 *
 * @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
 * 
 *
 * @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
 * 
 *
 * @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
 * 
 *
 * @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[img]属性值[/img]
 */
 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();
 }
 }

[http_cooler1217.iteye.com_blog_1233670]: http://cooler1217.iteye.com/blog/1233670