JAVA正则表达式,过滤HTML,替换HTML标签!
JAVA正则表达式,过滤HTML,替换HTML标签!
JAVA正则表达式,过滤HTML,替换HTML标签!
\
2009-03-15 10:20:00| 分类: Java正规表达式 |字号 订阅
\
工作中需要替换一些HTML标签,本来想以replace边截边替换得了,后来一想趁这个机会研究一下正则吧,搜一下,很多文章都讲到,我这里研究了一天,用的是JDK自带的正则编译,没用ORO之类的,简单,方便,还实用,能满足需求就可以了。现在把代码贴出来让大家分享一下,想做成一个通用的东西直接用,还不完善,建议大家有好的思路跟评论后贴出来,一起进步。
\
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 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
* <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(“<”);
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
* <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[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();
}
}