Java 中的 ASCII 到 HTML 实体转义

发布于 2024-10-26 23:02:02 字数 478 浏览 3 评论 0原文

我发现这个网站带有转义码，我只是想知道是否有人已经这样做了，这样我就不必花几个小时来构建这个逻辑：

 StringBuffer sb = new StringBuffer();
 int n = s.length();
 for (int i = 0; i < n; i++) {
     char c = s.charAt(i);
     switch (c) {
         case '\u25CF': sb.append("&#9679;"); break;
         case '\u25BA': sb.append("&#9658;"); break;

         /*
         ... the rest of the hex chars literals to HTML entities
         */  

         default:  sb.append(c); break;
     }
 }

原文

I found this website with escape codes and I'm just wondering if someone has done this already so I don't have to spend couple of hours building this logic:

 StringBuffer sb = new StringBuffer();
 int n = s.length();
 for (int i = 0; i < n; i++) {
     char c = s.charAt(i);
     switch (c) {
         case '\u25CF': sb.append("●"); break;
         case '\u25BA': sb.append("►"); break;

         /*
         ... the rest of the hex chars literals to HTML entities
         */  

         default:  sb.append(c); break;
     }
 }

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淡墨 2024-11-02 23:02:02

这些“代码”只是实际字符的 unicode 值的十进制表示形式。在我看来，这样的事情是可行的，除非你想非常严格地限制哪些代码被转换，哪些不被转换。

StringBuilder sb = new StringBuilder();
 int n = s.length();
 for (int i = 0; i < n; i++) {
     char c = s.charAt(i);
     if (Character.UnicodeBlock.of(c) != Character.UnicodeBlock.BASIC_LATIN) {
        sb.append("&#");
        sb.append((int)c);
        sb.append(';');
     } else {
        sb.append(c);
     }

 }

These "codes" is a mere decimal representation of the unicode value of the actual character. It seems to me that something like this would work, unless you want to be very strict about which codes get converted, and which don't.

StringBuilder sb = new StringBuilder();
 int n = s.length();
 for (int i = 0; i < n; i++) {
     char c = s.charAt(i);
     if (Character.UnicodeBlock.of(c) != Character.UnicodeBlock.BASIC_LATIN) {
        sb.append("&#");
        sb.append((int)c);
        sb.append(';');
     } else {
        sb.append(c);
     }

 }

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永不分离 2024-11-02 23:02:02

其他答案对于代理对无法正常工作，例如，如果您有“

The other answers don't work correctly for surrogate pairs, e.g. if you have Emojis such as "????" (see character info). Here's how to do it in Java 8:

StringBuilder sb = new StringBuilder();
s.codePoints().forEach(codePoint -> {
    if (Character.UnicodeBlock.of(codePoint) != Character.UnicodeBlock.BASIC_LATIN) {
        sb.append("&#");
        sb.append(codePoint);
        sb.append(';');
    } else {
        sb.appendCodePoint(codePoint);
    }
});

And for older Java:

StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.length(); ) {
    int c = s.codePointAt(i);
    if (Character.UnicodeBlock.of(c) != Character.UnicodeBlock.BASIC_LATIN) {
        sb.append("&#");
        sb.append(c);
        sb.append(';');
    } else {
        sb.appendCodePoint(c);
    }
    i += Character.charCount(c);
}

A simple way to test if a solution handles surrogate pairs correctly is to use "\uD83D\uDE00" (????) as the input. If the output is "��", then it's wrong. The correct output is 😀.

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躲猫猫 2024-11-02 23:02:02

嗯，如果您这样做会怎么样：

if (c > 127) {
    sb.append("&#" + (int) c + ";");
} else {
    sb.append(c);
}

然后您只需要确定您想要 HTML 转义的字符范围。在本例中，我只是指定了 ASCII 表空间之外的任何字符。

Hmm, what if you did something like this instead:

if (c > 127) {
    sb.append("&#" + (int) c + ";");
} else {
    sb.append(c);
}

Then you just need to determine the range of characters you want HTML escaped. In this case I just specified any character beyond the ASCII table space.

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