| 提交 | 用户 | 时间 | ||
| e57a89 | 1 | package com.jcdm.common.utils.html; |
| 懒 | 2 | |
| 3 | import com.jcdm.common.utils.StringUtils; | |
| 4 | ||
| 5 | /** | |
| 6 | * 转义和反转义工具类 | |
| 7 | * | |
| 8 | * @author jc | |
| 9 | */ | |
| 10 | public class EscapeUtil | |
| 11 | { | |
| 12 | public static final String RE_HTML_MARK = "(<[^<]*?>)|(<[\\s]*?/[^<]*?>)|(<[^<]*?/[\\s]*?>)"; | |
| 13 | ||
| 14 | private static final char[][] TEXT = new char[64][]; | |
| 15 | ||
| 16 | static | |
| 17 | { | |
| 18 | for (int i = 0; i < 64; i++) | |
| 19 | { | |
| 20 | TEXT[i] = new char[] { (char) i }; | |
| 21 | } | |
| 22 | ||
| 23 | // special HTML characters | |
| 24 | TEXT['\''] = "'".toCharArray(); // 单引号 | |
| 25 | TEXT['"'] = """.toCharArray(); // 双引号 | |
| 26 | TEXT['&'] = "&".toCharArray(); // &符 | |
| 27 | TEXT['<'] = "<".toCharArray(); // 小于号 | |
| 28 | TEXT['>'] = ">".toCharArray(); // 大于号 | |
| 29 | } | |
| 30 | ||
| 31 | /** | |
| 32 | * 转义文本中的HTML字符为安全的字符 | |
| 33 | * | |
| 34 | * @param text 被转义的文本 | |
| 35 | * @return 转义后的文本 | |
| 36 | */ | |
| 37 | public static String escape(String text) | |
| 38 | { | |
| 39 | return encode(text); | |
| 40 | } | |
| 41 | ||
| 42 | /** | |
| 43 | * 还原被转义的HTML特殊字符 | |
| 44 | * | |
| 45 | * @param content 包含转义符的HTML内容 | |
| 46 | * @return 转换后的字符串 | |
| 47 | */ | |
| 48 | public static String unescape(String content) | |
| 49 | { | |
| 50 | return decode(content); | |
| 51 | } | |
| 52 | ||
| 53 | /** | |
| 54 | * 清除所有HTML标签，但是不删除标签内的内容 | |
| 55 | * | |
| 56 | * @param content 文本 | |
| 57 | * @return 清除标签后的文本 | |
| 58 | */ | |
| 59 | public static String clean(String content) | |
| 60 | { | |
| 61 | return new HTMLFilter().filter(content); | |
| 62 | } | |
| 63 | ||
| 64 | /** | |
| 65 | * Escape编码 | |
| 66 | * | |
| 67 | * @param text 被编码的文本 | |
| 68 | * @return 编码后的字符 | |
| 69 | */ | |
| 70 | private static String encode(String text) | |
| 71 | { | |
| 72 | if (StringUtils.isEmpty(text)) | |
| 73 | { | |
| 74 | return StringUtils.EMPTY; | |
| 75 | } | |
| 76 | ||
| 77 | final StringBuilder tmp = new StringBuilder(text.length() * 6); | |
| 78 | char c; | |
| 79 | for (int i = 0; i < text.length(); i++) | |
| 80 | { | |
| 81 | c = text.charAt(i); | |
| 82 | if (c < 256) | |
| 83 | { | |
| 84 | tmp.append("%"); | |
| 85 | if (c < 16) | |
| 86 | { | |
| 87 | tmp.append("0"); | |
| 88 | } | |
| 89 | tmp.append(Integer.toString(c, 16)); | |
| 90 | } | |
| 91 | else | |
| 92 | { | |
| 93 | tmp.append("%u"); | |
| 94 | if (c <= 0xfff) | |
| 95 | { | |
| 96 | // issue#I49JU8@Gitee | |
| 97 | tmp.append("0"); | |
| 98 | } | |
| 99 | tmp.append(Integer.toString(c, 16)); | |
| 100 | } | |
| 101 | } | |
| 102 | return tmp.toString(); | |
| 103 | } | |
| 104 | ||
| 105 | /** | |
| 106 | * Escape解码 | |
| 107 | * | |
| 108 | * @param content 被转义的内容 | |
| 109 | * @return 解码后的字符串 | |
| 110 | */ | |
| 111 | public static String decode(String content) | |
| 112 | { | |
| 113 | if (StringUtils.isEmpty(content)) | |
| 114 | { | |
| 115 | return content; | |
| 116 | } | |
| 117 | ||
| 118 | StringBuilder tmp = new StringBuilder(content.length()); | |
| 119 | int lastPos = 0, pos = 0; | |
| 120 | char ch; | |
| 121 | while (lastPos < content.length()) | |
| 122 | { | |
| 123 | pos = content.indexOf("%", lastPos); | |
| 124 | if (pos == lastPos) | |
| 125 | { | |
| 126 | if (content.charAt(pos + 1) == 'u') | |
| 127 | { | |
| 128 | ch = (char) Integer.parseInt(content.substring(pos + 2, pos + 6), 16); | |
| 129 | tmp.append(ch); | |
| 130 | lastPos = pos + 6; | |
| 131 | } | |
| 132 | else | |
| 133 | { | |
| 134 | ch = (char) Integer.parseInt(content.substring(pos + 1, pos + 3), 16); | |
| 135 | tmp.append(ch); | |
| 136 | lastPos = pos + 3; | |
| 137 | } | |
| 138 | } | |
| 139 | else | |
| 140 | { | |
| 141 | if (pos == -1) | |
| 142 | { | |
| 143 | tmp.append(content.substring(lastPos)); | |
| 144 | lastPos = content.length(); | |
| 145 | } | |
| 146 | else | |
| 147 | { | |
| 148 | tmp.append(content.substring(lastPos, pos)); | |
| 149 | lastPos = pos; | |
| 150 | } | |
| 151 | } | |
| 152 | } | |
| 153 | return tmp.toString(); | |
| 154 | } | |
| 155 | ||
| 156 | public static void main(String[] args) | |
| 157 | { | |
| 158 | String html = "<script>alert(1);</script>"; | |
| 159 | String escape = EscapeUtil.escape(html); | |
| 160 | // String html = "<scr<script>ipt>alert(\"XSS\")</scr<script>ipt>"; | |
| 161 | // String html = "<123"; | |
| 162 | // String html = "123>"; | |
| 163 | System.out.println("clean: " + EscapeUtil.clean(html)); | |
| 164 | System.out.println("escape: " + escape); | |
| 165 | System.out.println("unescape: " + EscapeUtil.unescape(escape)); | |
| 166 | } | |
| 167 | } | |
