package com.jcdm.common.utils.html;
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import com.jcdm.common.utils.StringUtils;
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/**
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* 转义和反转义工具类
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*
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* @author jc
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*/
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public class EscapeUtil
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{
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public static final String RE_HTML_MARK = "(<[^<]*?>)|(<[\\s]*?/[^<]*?>)|(<[^<]*?/[\\s]*?>)";
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private static final char[][] TEXT = new char[64][];
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static
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{
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for (int i = 0; i < 64; i++)
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{
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TEXT[i] = new char[] { (char) i };
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}
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// special HTML characters
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TEXT['\''] = "'".toCharArray(); // 单引号
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TEXT['"'] = """.toCharArray(); // 双引号
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TEXT['&'] = "&".toCharArray(); // &符
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TEXT['<'] = "<".toCharArray(); // 小于号
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TEXT['>'] = ">".toCharArray(); // 大于号
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}
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/**
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* 转义文本中的HTML字符为安全的字符
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*
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* @param text 被转义的文本
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* @return 转义后的文本
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*/
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public static String escape(String text)
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{
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return encode(text);
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}
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/**
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* 还原被转义的HTML特殊字符
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*
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* @param content 包含转义符的HTML内容
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* @return 转换后的字符串
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*/
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public static String unescape(String content)
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{
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return decode(content);
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}
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/**
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* 清除所有HTML标签，但是不删除标签内的内容
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*
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* @param content 文本
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* @return 清除标签后的文本
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*/
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public static String clean(String content)
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{
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return new HTMLFilter().filter(content);
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}
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/**
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* Escape编码
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*
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* @param text 被编码的文本
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* @return 编码后的字符
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*/
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private static String encode(String text)
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{
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if (StringUtils.isEmpty(text))
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{
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return StringUtils.EMPTY;
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}
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final StringBuilder tmp = new StringBuilder(text.length() * 6);
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char c;
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for (int i = 0; i < text.length(); i++)
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{
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c = text.charAt(i);
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if (c < 256)
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{
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tmp.append("%");
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if (c < 16)
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{
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tmp.append("0");
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}
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tmp.append(Integer.toString(c, 16));
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}
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else
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{
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tmp.append("%u");
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if (c <= 0xfff)
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{
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// issue#I49JU8@Gitee
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tmp.append("0");
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}
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tmp.append(Integer.toString(c, 16));
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}
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}
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return tmp.toString();
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}
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/**
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* Escape解码
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*
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* @param content 被转义的内容
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* @return 解码后的字符串
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*/
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public static String decode(String content)
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{
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if (StringUtils.isEmpty(content))
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{
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return content;
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}
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StringBuilder tmp = new StringBuilder(content.length());
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int lastPos = 0, pos = 0;
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char ch;
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while (lastPos < content.length())
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{
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pos = content.indexOf("%", lastPos);
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if (pos == lastPos)
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{
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if (content.charAt(pos + 1) == 'u')
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{
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ch = (char) Integer.parseInt(content.substring(pos + 2, pos + 6), 16);
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tmp.append(ch);
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lastPos = pos + 6;
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}
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else
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{
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ch = (char) Integer.parseInt(content.substring(pos + 1, pos + 3), 16);
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tmp.append(ch);
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lastPos = pos + 3;
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}
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}
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else
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{
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if (pos == -1)
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{
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tmp.append(content.substring(lastPos));
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lastPos = content.length();
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}
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else
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{
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tmp.append(content.substring(lastPos, pos));
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lastPos = pos;
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}
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}
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}
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return tmp.toString();
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}
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public static void main(String[] args)
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{
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String html = "<script>alert(1);</script>";
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String escape = EscapeUtil.escape(html);
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// String html = "<scr<script>ipt>alert(\"XSS\")</scr<script>ipt>";
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// String html = "<123";
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// String html = "123>";
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System.out.println("clean: " + EscapeUtil.clean(html));
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System.out.println("escape: " + escape);
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System.out.println("unescape: " + EscapeUtil.unescape(escape));
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}
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}
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