找到了无效的XML字符(Unicode:0xc)

Question

使用Java DOM解析器解析XML文件会导致:

[Fatal Error] os__flag_8c.xml:103:135: An invalid XML character (Unicode: 0xc) was found in the element content of the document.
org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0xc) was found in the element content of the document.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at javax.xml.parsers.DocumentBuilder.parse(Unknown Source)

Answer 1

即使将数据封装在CDATA块中,XML文档中也有一些不允许的字符.

如果您生成了文档,则需要对其进行实体编码或将其删除.如果您有错误的文档,则应在尝试解析之前删除这些字符.

请参阅此主题中的dolmens答案:XML中的无效字符

他链接到这篇文章:http://www.w3.org/TR/xml/#charsets

基本上,不允许低于0x20的所有字符,除了0x9(TAB),0xA(CR？),0xD(LF？)

Answer 2

public String stripNonValidXMLCharacters(String in) {
    StringBuffer out = new StringBuffer(); // Used to hold the output.
    char current; // Used to reference the current character.

    if (in == null || ("".equals(in))) return ""; // vacancy test.
    for (int i = 0; i < in.length(); i++) {
        current = in.charAt(i); // NOTE: No IndexOutOfBoundsException caught here; it should not happen.
        if ((current == 0x9) ||
            (current == 0xA) ||
            (current == 0xD) ||
            ((current >= 0x20) && (current <= 0xD7FF)) ||
            ((current >= 0xE000) && (current <= 0xFFFD)) ||
            ((current >= 0x10000) && (current <= 0x10FFFF)))
            out.append(current);
    }
    return out.toString();
}    

Answer 3

每当无效的 xml 字符出现在 xml 中时，就会出现这样的错误。当你在记事本++中打开它时，它看起来像 VT、SOH、FF，这些都是无效的 xml 字符。我使用的是 xml 1.0 版，并且在按模式将文本数据输入数据库之前验证文本数据

Pattern p = Pattern.compile("[^\u0009\u000A\u000D\u0020-\uD7FF\uE000-\uFFFD\u10000-\u10FFF]+"); 
retunContent = p.matcher(retunContent).replaceAll("");

它将确保不会在 xml 中输入无效的特殊字符

Answer 4

字符0x0C在XML 1.0中无效,但在XML 1.1中是有效字符.因此,除非xml文件在prolog中将版本指定为1.1,否则它将无效,您应该向该文件的生产者投诉.