Question

我正在尝试将dom节点转换为具有以下代码的字节（jdk1.8.0_40）：

    DOMImplementationLS domImplementationLS = (DOMImplementationLS) (node instanceof Document ? ((Document) node) : node.getOwnerDocument()).getImplementation().getFeature("LS", "3.0");
    LSSerializer lsSerializer = domImplementationLS.createLSSerializer();
    lsSerializer.getDomConfig().setParameter("format-pretty-print", prettyPrint);
    LSOutput lsOutput = domImplementationLS.createLSOutput();
    lsOutput.setEncoding(UTF_8.toString());

    ByteArrayOutputStream writer = new ByteArrayOutputStream();
    lsOutput.setByteStream(writer);
    lsSerializer.write(node, lsOutput);

这导致NPE：

org.w3c.dom.ls.LSException
at com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.write(DOMSerializerImpl.java:844)
java.lang.NullPointerException
at com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.prepareForSerialization(DOMSerializerImpl.java:1063)
at com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.write(DOMSerializerImpl.java:747) ... 40 more

这是java中的错误还是我做错了什么？

更新：我发现当我得到文档元素时它可以工作：

lsSerializer.write((node instanceof Document ? ((Document) node) : node.getOwnerDocument()), lsOutput);

java doc声明：要序列化的节点，但似乎这不是Document节点。

使用LS将dom转换为字节时的NPE

0 个答案: