java操作xpath相关代码整理［实战XPATH］

1、XML配置文件如下

<?xml version="1.0" encoding="ISO-8859-1"?>
<bookstore>
<book>
<title lang="eng">Harry Potter</title>
<price>29.99</price>
</book>
<book>
<title lang="eng">Learning XML</title>
<price>39.95</price>
</book>
</bookstore>

2、相关的JAVA代码片段
2.1

public static void main(String[] args) {
        List firstName = new ArrayList();
        List attrs = new ArrayList();
        SAXReader saxReader = new SAXReader();
        try {
            Document doc = saxReader.read("t.xml");
            String xpathString = "bookstore/*/title";
            List list = doc.selectNodes(xpathString);
            Iterator it = list.iterator();
            while(it.hasNext()) {
                Element elt = (Element)it.next();
                System.out.println(elt.getName());
                Attribute attr = (Attribute) elt.attribute("lang");
                System.out.println(attr.getValue());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

输出：

title、eng、title、eng

介绍：bookstore/*/title 这种XPATH表达式的作用！


2.2

public static void main(String[] args) {
        List firstName = new ArrayList();
        List attrs = new ArrayList();
        SAXReader saxReader = new SAXReader();
        try {
            Document doc = saxReader.read("t.xml");
            String xpathString = "bookstore/book/*[@lang]";
            List list = doc.selectNodes(xpathString);
            System.out.println(list.size());
            Iterator it = list.iterator();
            while(it.hasNext()) {
                System.out.println("a");
                Element elt = (Element)it.next();
                System.out.println(elt.getName());
                Attribute attr = (Attribute) elt.attribute("lang");
                System.out.println(attr.getValue());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }