正在解析 xml DOM 个具有 java 的子节点

Question

我有以下结构 xml

<entities>
        <entity>
            <type>FieldTerminology</type>
            <relevance>0.732316</relevance>
            <sentiment>
                <type>negative</type>
                <score>-0.351864</score>
            </sentiment>
            <count>2</count>
            <text>financial crisis</text>
        </entity>
        <entity>
            <type>Company</type>
            <relevance>0.496572</relevance>
            <sentiment>
                <type>neutral</type>
            </sentiment>
            <count>1</count>
            <text>Goldman Sachs</text>
            <disambiguated>
                <name>Goldman Sachs</name>
                <subType>CompanyShareholder</subType>
                <website>http://www.gs.com/</website>
                <dbpedia>http://dbpedia.org/resource/Goldman_Sachs</dbpedia>
                <freebase>http://rdf.freebase.com/ns/m.01xdn1</freebase>
                <yago>http://yago-knowledge.org/resource/Goldman_Sachs</yago>
                <crunchbase>http://www.crunchbase.com/company/goldman-sachs</crunchbase>
            </disambiguated>
        </entity>

我正在解析所有，只有我无法访问子情感有了这个我怎样才能在每个实体节点中也访问 "sentiment"？

 NodeList feeds = docs.getElementsByTagName("entities");
            for (int i = 0; i < feeds.getLength(); i++) {
                Node mainNode = feeds.item(i);
                if (mainNode.getNodeType() == Node.ELEMENT_NODE) {
                    Element firstElement = (Element) mainNode;
                    System.out.println("First element " + firstElement.getTagName());
                    NodeList forumidNameList = firstElement.getElementsByTagName("entity");

                    for (int j = 0; j < forumidNameList.getLength(); ++j) {
                        Element value = (Element) forumidNameList.item(j);

                        NodeList conditionList = value.getElementsByTagName("relevance");
                        for (int k = 0; k < conditionList.getLength(); ++k) {
                            Element condition = (Element) conditionList.item(k);
                            String conditionText = condition.getFirstChild().getNodeValue();
                            System.out.println("relevance " + conditionText);
                        }
                        NodeList conditionList1 = value.getElementsByTagName("type");
                        for (int k = 0; k < conditionList1.getLength(); ++k) {
                            Element condition = (Element) conditionList1.item(k);
                            String conditionText = condition.getFirstChild().getNodeValue();
                            System.out.println("type " + conditionText);
                        }
                        NodeList conditionList2 = value.getElementsByTagName("count");
                        for (int k = 0; k < conditionList2.getLength(); ++k) {
                            Element condition = (Element) conditionList2.item(k);
                            String conditionText = condition.getFirstChild().getNodeValue();
                            System.out.println("count " + conditionText);
                        }
                        NodeList conditionList3 = value.getElementsByTagName("text");
                        for (int k = 0; k < conditionList3.getLength(); ++k) {
                            Element condition = (Element) conditionList3.item(k);
                            String conditionText = condition.getFirstChild().getNodeValue();
                            System.out.println("text " + conditionText);
                        }

我需要解析实体列表和子节点。

Answer 1

您是否考虑过使用不同的解析器？我发现 DOM 很难处理更复杂的 XML 结构。我建议尝试使用 JDOM，我发现它可以更好地处理像您这样的访问问题。

Answer 2

我试图让你的问题得到解决，我做了以下更改 1. 为 <sentiment> 添加了缺失节点解析 2. 改进了 <type> 节点的解析逻辑，因为它会因为 dom 结构中的同名出现两次。

注意：我仍然建议使用 JAXB、XPath 进行高效的 xml 解析。希望有帮助代码在这里。

    NodeList feeds = doc.getElementsByTagName("entities");
    for (int i = 0; i < feeds.getLength(); i++) {
        Node mainNode = feeds.item(i);
        if (mainNode.getNodeType() == Node.ELEMENT_NODE) {
            Element firstElement = (Element) mainNode;
            System.out.println("First element "
                    + firstElement.getTagName());
            NodeList forumidNameList = firstElement
                    .getElementsByTagName("entity");

            for (int j = 0; j < forumidNameList.getLength(); ++j) {
                Element value = (Element) forumidNameList.item(j);

                NodeList conditionList = value
                        .getElementsByTagName("type");
                for (int k = 0; k < conditionList.getLength(); ++k) {
                    Element condition = (Element) conditionList.item(k);
                    if (condition.getParentNode().getNodeName()
                            .equals("entity")) {
                        String conditionText = condition
                                .getFirstChild().getNodeValue();
                        System.out.println("type " + conditionText);

                    }
                }
                NodeList conditionList1 = value
                        .getElementsByTagName("relevance");
                for (int k = 0; k < conditionList1.getLength(); ++k) {
                    Element condition = (Element) conditionList1
                            .item(k);
                    String conditionText = condition.getFirstChild()
                            .getNodeValue();
                    System.out.println("relevance " + conditionText);
                }
                NodeList conditionList2 = value
                        .getElementsByTagName("sentiment");
                for (int k = 0; k < conditionList2.getLength(); ++k) {
                    Element condition = (Element) conditionList2
                            .item(k);
                    for (int l = 0; l < condition.getChildNodes()
                            .getLength(); ++l) {
                        Element condition2 = (Element) condition
                                .getChildNodes().item(l);
                        String conditionText = condition2
                                .getFirstChild().getNodeValue();
                        System.out
                                .println("sentiment " + conditionText);
                    }
                }
                NodeList conditionList3 = value
                        .getElementsByTagName("count");
                for (int k = 0; k < conditionList3.getLength(); ++k) {
                    Element condition = (Element) conditionList3
                            .item(k);
                    String conditionText = condition.getFirstChild()
                            .getNodeValue();
                    System.out.println("count " + conditionText);
                }
                NodeList conditionList4 = value
                        .getElementsByTagName("text");
                for (int k = 0; k < conditionList4.getLength(); ++k) {
                    Element condition = (Element) conditionList4
                            .item(k);
                    String conditionText = condition.getFirstChild()
                            .getNodeValue();
                    System.out.println("text " + conditionText);
                }
            }
        }
    }
output
----------------
First element entities
type FieldTerminology
relevance 0.732316
sentiment negative
sentiment -0.351864
count 2
text financial crisis
type Company
relevance 0.496572
sentiment neutral
count 1
text Goldman Sachs

正在解析 xml DOM 个具有 java 的子节点

Parsing xml DOM child nodes with java

java

xml

dom

xml-parsing