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java html character escape character

May 15, 2023 pm 03:19 PM

Java中的HTML字符转义字符

在HTML中,有一些特殊字符会被浏览器解析成标记符号而不是正常的文本。如果我们需要在HTML页面中输出这些特殊字符,就需要使用HTML字符转义符。

Java也提供了字符转义处理的功能,可以将HTML字符转义为对应的转义字符,或者将转义字符还原为原始字符。

  1. HTML特殊字符

在HTML中,下面这些字符都是特殊字符:

< 小于号(左尖括号)

大于号(右尖括号)

& 和号(&符号)

" 双引号

' 单引号

这些字符都具有特殊的含义,如果我们需要在HTML页面中直接输出这些字符,可能会引起解析错误,甚至导致页面崩溃。

  1. Java中的HTML字符转义

Java中提供了一些类方法,可以将HTML特殊字符转义为对应的转义字符,从而在HTML页面中输出正确的内容。

使用Java的内置方法进行转义,在Java代码中可以这样实现:

import org.apache.commons.text.StringEscapeUtils;

public class Main {
    public static void main(String[] args) {
        String source = "<p>这是一段测试字符</p>";
        String escaped = StringEscapeUtils.escapeHtml4(source);
        System.out.println(escaped);
    }
}
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在实际使用中,可以在需要输出特殊HTML字符的位置,使用类似于下面这样的代码进行转义:

String escaped = StringEscapeUtils.escapeHtml4("<p>这是一段测试字符</p>");
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  1. Java中的HTML字符反转义

相应地,Java也提供了将转义字符还原回原始字符的处理方法。

在需要将转义字符还原回原始字符的地方,可以使用类似下面这样的代码:

String unescaped = StringEscapeUtils.unescapeHtml4("&lt;p&gt;这是一段测试字符&lt;/p&gt;");
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  1. 总结

在开发Java Web应用程序时,避免输出特殊HTML字符将会是一个挑战。利用字符串转义处理可以解决这些问题,使得我们可以通过Java代码更加轻松地操作HTML页面中的内容。

在每一个输出到HTML页面的字符串上加上转换方法,可以避免在代码中硬编码转义字符,并且可以更容易地维护代码。

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字符转义字符
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>

>
& &
" "
' '