Question

当我尝试从XML文件执行加载时，我觉得xstream加载速度达不到我的要求。对于一个包含10k ++条目的“数据库”，需要几分钟。

以下是我用于序列化的整个数据结构。列表的大小（符号和代码）将是大约10k ++条目。

http://jstock.cvs.sourceforge.net/viewvc/jstock/jstock/src/org/yccheok/jstock/engine/StockCodeAndSymbolDatabase.java?revision=1.11&view=markup

我有什么方法可以尝试，看看它是否会加快我的加载时间？能够仍然加载回来以前保存的文件也很重要。

以下是用于反序列化的代码。感谢。

@SuppressWarnings("unchecked")
public static <A> A fromXML(Class c, File file) {
    XStream xStream = new XStream(new DomDriver("UTF-8"));
    InputStream inputStream = null;

    try {
        inputStream = new java.io.FileInputStream(file);
        Object object = xStream.fromXML(inputStream);
        if (c.isInstance(object)) {
            return (A)object;
        }
    }
    catch (Exception exp) {
        log.error(null, exp);
    }
    finally {
        if (false == close(inputStream)) {
        return null;
        }
        inputStream = null;
    }

    return null;
}

Answer 1

避免使用缓慢的DomDriver。

@SuppressWarnings("unchecked")
public static <A> A fromXML(Class c, File file) {
    // Don't ever try to use DomDriver. They are VERY slow.
    XStream xStream = new XStream();
    InputStream inputStream = null;
    Reader reader = null;

    try {
        inputStream = new java.io.FileInputStream(file);
        reader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
        Object object = xStream.fromXML(reader);

        if (c.isInstance(object)) {
            return (A)object;
        }
    }
    catch (Exception exp) {
        log.error(null, exp);
    }
    finally {
        if (false == close(reader)) {
            return null;
        }
        if (false == close(inputStream)) {
            return null;
        }
        reader = null;
        inputStream = null;
    }

    return null;
}

优化xstream的加载速度

1 个答案: