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我正在使用简单的 xml 库http://simple.sourceforge.net/来反序列化来自套接字输入流的对象。虽然在简单的java应用程序中同样的情况工作正常，但在android中我得到了，之后

MyObject obj = serializer.read(MyObject.class,socket.getInputStream())

org.simpleframework.xml.stream.NodeException：文档没有根元素

这是为什么？？

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2 回答 2

1

你还没有收到数据。尝试设置日志并检查数据是否存在

于 2016-02-15T11:46:13.253 回答
0

由于我在这里的最后一篇文章被删除了，我的 xml 再次被删除：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<masterclass>
    <question className="Cosmos">
        <body>What year was the first step on the Moon?</body>
        <answer valid="0">1972</answer>
        <answer valid="0">1971</answer>
        <answer valid="0">1970</answer>
        <answer valid="1">1969</answer>
    </question>
    <question className="Cosmos">
        <body>Who were the first men to walk on the Moon?</body>
        <answer valid="1">Neil Armstrong</answer>
        <answer valid="0">Michael Collins</answer>
        <answer valid="0">Eugene Cernan</answer>
        <answer valid="1">Edwin Aldrin</answer>
    </question>
    <question className="History">
        <body>When did Christening of Poland took place?</body>
        <answer valid="0">1025</answer>
        <answer valid="1">966</answer>
        <answer valid="0">866</answer>
        <answer valid="0">916</answer>
    </question>
    <question className="Math">
        <body>Stone weighs 2kg and half stone. How much stone weighs?</body>
        <answer valid="0">2.5kg</answer>
        <answer valid="0">3kg</answer>
        <answer valid="1">4kg</answer>
        <answer valid="0">5kg</answer>
    </question>
</masterclass>

以及解组 xml 文件的代码

// download successed
try {
    Serializer xmlSer = new Persister();
    InputStream fis = new FileInputStream(xmlFilePath);
    BufferedReader in = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
    MasterClass mc = xmlSer.read(MasterClass.class, in);
    MasterClass mc = xmlSer.read(MasterClass.class, str);
    Toast.makeText(context.get(), ""+mc.getQuestionList().size(),
        Toast.LENGTH_LONG).show();
} catch (Exception ee) {
    Log.e("MasterClass", "xml serialize problem", ee);
}

错误在这一行：

MasterClass mc = xmlSer.read(MasterClass.class, in);

当改为这样：

String str = "", s;
while((s = in.readLine()) != null) {
    str += s;
    //Log.d("MasterClass", str);
}
MasterClass mc = xmlSer.read(MasterClass.class, str);

它开始工作了。不知道为什么……但根据我的研究，这可能与文件在设备上的保存方式有关：

OutputStream fos = new FileOutputStream(outputFile);
BufferedWriter br = new BufferedWriter(new OutputStreamWriter(fos, "UTF-8"));
br.write(content);
br.flush();
br.close();

和 xml 文件编码 - 在记事本 ++ 中设置为 UTF-8 而没有 BOM。

致模组：不知道如何删除所以请在下面删除我的问题，tks :)

于 2019-09-30T10:32:50.480 回答