import java.util.regex.Matcher;
import java.util.regex.Pattern;
public classHtmlRegexpUtil {
privatefinalstaticStringregxpForHtml= "]*)>"; // 过滤所有以结尾的标签
privatefinalstaticStringregxpForImgTag= "]*)\\s*>"; // 找出IMG标签
privatefinalstaticStringregxpForImaTagSrcAttrib = "src=\"([^\"]+)\""; // 找出IMG标签的SRC属性
publicHtmlRegexpUtil() {
}
publicString replaceTag(String input) {
if (!hasSpecialChars(input)) {
return input;
}
StringBuffer filtered = newStringBuffer(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());
}
publicbooleanhasSpecialChars(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;
}
publicstaticString 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();
}
publicstaticString fiterHtmlTag(String str, String tag) {
String regxp = "]*)\\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();
}
publicstaticString 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 = 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();
}
}