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Java XOM规范化-伪字符

xml java

RedGrittyBrick · 技术社区 · 15 年前

XOM 规范化一些XML。但是在输出前有一些奇怪的字符。该准则的核心如下:

String result;
outputstream = new ObjectOutputStream(bytestream);
Builder builder = new Builder();
Canonicalizer canonicalizer = new Canonicalizer(outputstream, Canonicalizer.EXCLUSIVE_XML_CANONICALIZATION);
nu.xom.Document input = builder.build(xml, uri);
Node node = input.getRootElement();
String xpath = "//a:head";
XPathContext context = new XPathContext("a", "http://example.com/a");
Nodes nodes = node.query(xpath, context);
if (nodes.size() > 0) {
    canonicalizer.write(nodes.get(0));
    outputstream.close();
    result = bytestream.toString("UTF8");
}

包含的xml

<a:envelope   xmlns:b='http://example.com/b'   xmlns:a="http://example.com/a">
  <a:document>
    <a:head>
      <b:this>this</b:this>
      <b:that>that</b:that>
      <b:what />
    </a:head>
    <a:body>
    </a:body>
  </a:document>
</a:envelope>

< . 字节流中字节的十进制值为-84、-19、0、5119、-36、60。(后面是规范的XML)。

我做错什么了?

1 回复 | 直到 15 年前

RedGrittyBrick 15 年前

问题是,由于某种原因,我无法理解,我把一个bytearyoutputstream包在一个 . 因此,可能输出的前缀是对象元数据的某种序列化。

我刚刚直接使用了ByteArrayOutputStream,现在的输出如我所料。

    String result = "error";
    String uri = "http://example.com/uri";
    String xpath = textArea.getText();
    ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
    try {
        Builder builder = new Builder();
        Canonicalizer canonicalizer = new Canonicalizer(bytestream, 
                Canonicalizer.EXCLUSIVE_XML_CANONICALIZATION);
        nu.xom.Document input = builder.build(xml, uri);
        Node node = input.getRootElement();
        XPathContext context = new XPathContext("a", "http://example.com/a");
        Nodes nodes = node.query(xpath, context);
        if (nodes.size() > 0) {
            canonicalizer.write(nodes.get(0));
            bytestream.close();
            result = bytestream.toString("UTF8");
        }
    catch (...){ ... }

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