在 StAX XMLStreamConstants.CHARACTERS 事件中获取 XML 节点文本的问题 [英] Problems getting XML node text in StAX XMLStreamConstants.CHARACTERS event

问题描述

在使用 StAX 和 XMLStreamReader 读取 XML 文件时，我遇到了一个奇怪的问题.不确定是错误还是我做错了什么.仍在学习 StAX.

While reading an XML file using StAX and XMLStreamReader, I encountered a weird problem. Not sure if its an error or I am doing something wrong. Still learning StAX.

问题来了，

1. 在 XMLStreamConstants.CHARACTERS 事件中，当我以 XMLStreamReader.getText() 方法收集节点文本时.
2. 如果节点文本中有 &、<、> 或什至是隐藏的东西，它只返回文本字符串的第一部分.例如ABC &XYZ 只返回 ABC

1. In XMLStreamConstants.CHARACTERS event, when I collect node text as XMLStreamReader.getText() method.
2. If there is &, <, > or even something hidden for instance in node text, it returns only the first part of the text string. e.g. ABC & XYZ returns only ABC

简化的 Java 源代码:

    // Start StaX reader
    XMLInputFactory xmlInputFactory = XMLInputFactory.newInstance();
    try {
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(inStream);
        int event = xmlStreamReader.getEventType();
        while (true) {
            switch (event) {
                case XMLStreamConstants.START_ELEMENT:
                    switch (xmlStreamReader.getLocalName()) {
                        case "group":
                        // Do something
                            break;
                        case "source":
                            isSource = true;
                            break;
                        case "target":
                            isTarget = true;
                            break;
                        default:
                            isSource = false;
                            isTrans = false;
                            break;
                    }
                    break;
                case XMLStreamConstants.CHARACTERS:
                    if (srcData != null) {
                        String srcTrns = xmlStreamReader.getText();
                        if (srcTrns != null) {
                            if (isSource) {
                                // Set source text
                                isSource = false;
                            } else if (isTrans) {
                                // Set target text
                                isTrans = false;
                            }
                        }
                    }
                    break;
                case XMLStreamConstants.END_ELEMENT:
                    if (xmlStreamReader.getLocalName().equals("group")) {
                        // Add to return list
                    }
                    break;
            }
            if (!xmlStreamReader.hasNext()) {
                break;
            }
            event = xmlStreamReader.next();
        }
    } catch (XMLStreamException ex) {
        LOG.log(Level.WARNING, ex.getMessage(), MessageFormat.format("{0} {1}", ex.getCause(), ex.getLocation()));
    }

我不太确定我到底做错了什么或如何收集节点的完整文本.

I am not quite sure what exactly I am doing wrong or how to collect complete text of the node.

任何建议或提示都会对继续学习 StAX 有很大帮助.:-)

Any suggestions or tips would be a great help to move on learning StAX more. :-)

推荐答案

经过一番苦苦研究，我已经解决了这个问题.

I have solved the problem after struggling and researching a bit.

阅读带有转义实体引用的文本时出现问题.你需要设置XMLInputFactory IS_COALECING 到 true

It was a problem reading text with escaped entity references. You need to set XMLInputFactory IS_COALESCING to true

XMLInputFactory.setProperty(XMLInputFactory.IS_COALESCING, true);

基本上，这告诉解析器用它们各自的替换文本(换句话说，类似于解码)替换内部实体引用，并将它们作为普通字符读取.

Basically this tells the parser to replace internal entity references with their respective replacement text (in other words, something like decoding) and read them as normal characters.

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