java正则 过滤html标签_java正则表达式过滤html标签
importjava.util.regex.Matcher;importjava.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
*
*
*@authorhejian
*@version1.0
* @createtime 2006-10-16*/
public classHtmlRegexpUtil {private final static String regxpForHtml = "]*)>"; //过滤所有以结尾的标签
private final static String regxpForImgTag = "]*)\\s*>"; //找出IMG标签
private final static String regxpForImaTagSrcAttrib = "src=\"([^\"]+)\""; //找出IMG标签的SRC属性
/****/
publicHtmlRegexpUtil() {//TODO Auto-generated constructor stub
}/***
* 基本功能：替换标记以正常显示
*
*
*@paraminput
*@returnString*/
publicString replaceTag(String input) {if (!hasSpecialChars(input)) {returninput;
}
StringBuffer filtered= newStringBuffer(input.length());charc;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
*
*
*@paraminput
*@returnboolean*/
public booleanhasSpecialChars(String input) {boolean flag = false;if ((input != null) && (input.length() > 0)) {charc;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;
}
}
}returnflag;
}/***
* 基本功能：过滤所有以""结尾的标签
*
*
*@paramstr
*@returnString*/
public staticString filterHtml(String str) {
Pattern pattern=Pattern.compile(regxpForHtml);
Matcher matcher=pattern.matcher(str);
StringBuffer sb= newStringBuffer();boolean result1 =matcher.find();while(result1) {
matcher.appendReplacement(sb,"");
result1=matcher.find();
}
matcher.appendTail(sb);returnsb.toString();
}/***
* 基本功能：过滤指定标签
*
*
*@paramstr
*@paramtag
* 指定标签
*@returnString*/
public staticString fiterHtmlTag(String str, String tag) {
String regxp= "]*)\\s*>";
Pattern pattern=Pattern.compile(regxp);
Matcher matcher=pattern.matcher(str);
StringBuffer sb= newStringBuffer();boolean result1 =matcher.find();while(result1) {
matcher.appendReplacement(sb,"");
result1=matcher.find();
}
matcher.appendTail(sb);returnsb.toString();
}/***
* 基本功能：替换指定的标签
*
*
*@paramstr
*@parambeforeTag
* 要替换的标签
*@paramtagAttrib
* 要替换的标签属性值
*@paramstartTag
* 新标签开始标记
*@paramendTag
* 新标签结束标记
*@returnString
* @如：替换img标签的src属性值为[img]属性值[/img]*/
public staticString replaceHtmlTag(String str, String beforeTag,
String tagAttrib, String startTag, String endTag) {
String regxpForTag= "]*)\\s*>";
String regxpForTagAttrib= tagAttrib + "=\"([^\"]+)\"";
Pattern patternForTag=Pattern.compile(regxpForTag);
Pattern patternForAttrib=Pattern.compile(regxpForTagAttrib);
Matcher matcherForTag=patternForTag.matcher(str);
StringBuffer sb= newStringBuffer();boolean result =matcherForTag.find();while(result) {
StringBuffer sbreplace= newStringBuffer();
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);returnsb.toString();
}
}