StreamException: 无效的 XML 字符 (Unicode: 0x1a) [英] StreamException: An invalid XML character (Unicode: 0x1a)

问题描述

我正在使用 XStream 将用户的对象保存在文件中.

I am using XStream to save the object of user in a file.

private void store() {
    XStream xStream = new XStream(new DomDriver("UTF-8"));
    xStream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);

    xStream.alias("configuration", Configuration.class);
    xStream.alias("user", User.class);

    synchronized (ConfigurationDAOImpl.class) {
        try {
            xStream.toXML(configuration, new FileOutputStream(filename.getFile()));
        } catch (IOException e) {
            throw new RuntimeException("Failed to write to " + filename, e);
        }
    }
}

当我尝试通过以下代码读取它时，出现异常:com.thoughtworks.xstream.io.StreamException:: 在文档的元素内容中发现无效的 XML 字符 (Unicode: 0x1a).

When I am trying to read it by the following code I get an Exception: com.thoughtworks.xstream.io.StreamException: : An invalid XML character (Unicode: 0x1a) was found in the element content of the document.

private void lazyLoad() {
    synchronized (ConfigurationDAOImpl.class) {
        // Has the configuration been loaded
        if (configuration == null) {
            if (filename.exists()) {
                try {
                    XStream xStream = new XStream(new DomDriver("UTF-8"));
                    xStream.setMode(XStream.XPATH_ABSOLUTE_REFERENCES);

                    xStream.alias("configuration", Configuration.class);
                    xStream.alias("user", User.class);

                    configuration = (Configuration) xStream
                            .fromXML(filename.getInputStream());

                    LOGGER.debug("Loaded configuration from {}.", filename);
                } catch (Exception e) {
                    LOGGER.error("Failed to load configuration.", e);
                }
            } else {
                LOGGER.debug("{} does not exist.", filename);
                LOGGER.debug("Creating blank configuration.");

                configuration = new Configuration();
                configuration.setUsers(new ArrayList<User>());

                // and store it
                store();
            }
        }
    }
}

有什么想法吗?

推荐答案

我通过以下方法将 0x1a 替换为破折号 ('-'):

I replaced 0x1a with a dash character ('-') by the following method:

/**
 * This method ensures that the output String has only
 * @param in the string that has a non valid character.
 * @return the string that is stripped of the non-valid character
 */
private String stripNonValidXMLCharacters(String in) {      
    if (in == null || ("".equals(in))) return null;
    StringBuffer out = new StringBuffer(in);
    for (int i = 0; i < out.length(); i++) {
        if(out.charAt(i) == 0x1a) {
            out.setCharAt(i, '-');
        }
    }
    return out.toString();
}

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