致命错误：字符引用“org.xml.sax.SAXParseException;

Question

有

 <BATCHNAME>&#4; Any</BATCHNAME> 

我的xml请求中的标记有''字符值。没有这些字符我的代码完美无缺，但在某些情况下我有这些字符。它给了我以下错误

[致命错误]：144：28：字符引用“＆＃org.xml.sax.SAXParseException; lineNumber：144; columnNumber：28;字符引用”＆＃com.sun.org.apache.xerces.internal.parsers。 DOMParser.parse（DOMParser.java:257）位于com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse（DocumentBuilderImpl.java:339）的javax.xml.parsers.DocumentBuilder.parse（DocumentBuilder.java： 121）在db（AllCommonTasks.java:277）at ...

我需要这些字符进行验证

我正在尝试这段代码=>

try {                      

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();

        URLConnection urlConnection = new URL(urlString).openConnection();
        urlConnection.addRequestProperty("Accept", "application/xml");
        urlConnection.addRequestProperty("User-Agent", "Mozilla/5.0 ( compatible ) ");
        Document doc = db.parse(urlConnection.getInputStream());
        doc.getDocumentElement().normalize();

        str = convertDocumentToString(doc);


    }catch(Exception e){
        System.err.println("In exception 1");
        e.printStackTrace();
    }

我怎么解决这个问题？

Answer 1

查看Wikipedia page for XML and HTML entity references，遵循&#nnnn;模式的实体引用是十进制形式的Unicode代码点，这意味着将等同于Unicode U+0004：END OF TRANSMISSION这是一个非打印字符。

所以我认为解析器在这种情况下是正确的失败。

事实上，如果你看看com.sun.org.apache.xerces.internal.impl.XMLScanner#scanCharReferenceValue的来源，你可以看到它在这里引用com.sun.org.apache.xerces.internal.util.XMLChar#isValid：

/**
 * Returns true if the specified character is valid. This method
 * also checks the surrogate character range from 0x10000 to 0x10FFFF.
 * <p>
 * If the program chooses to apply the mask directly to the
 * <code>CHARS</code> array, then they are responsible for checking
 * the surrogate character range.
 *
 * @param c The character to check.
 */
public static boolean isValid(int c) {
    return (c < 0x10000 && (CHARS[c] & MASK_VALID) != 0) ||
           (0x10000 <= c && c <= 0x10FFFF);
} // isValid(int):boolean