xml解析Jsoup根据选择器查询和xmlJsoup根据Xpath查询

xml解析Jsoup根据选择器查询

selector：选择器

　　使用的方法：Elements select(String cssQuery)

    /*
        选择器查询
     */
    private static void xuanze() throws IOException{
        //获取student.xml的path
        String path = Jsoup_3_Document.class.getClassLoader().getResource("student.xml").getPath();
        //获取Document对象
        Document document = Jsoup.parse(new File(path), "utf-8");
        //3.查询name标签
        Elements elements = document.select("name");
        System.out.println(elements);
        System.out.println("=======================");
        //查询id值为itcast的元素
        Elements elements1 = document.select("#itcast");
        System.out.println(elements1);
        System.out.println("=======================");
        //获取student标签并且number属性值为sq_0001的age子标签
        Elements elements2 = document.select("student[number=\"sq_0001\"] > age");
        System.out.println(elements2);
    }

 

xmlJsoup根据Xpath查询

XPath即为XML路径语言（XML Path Language），它是一种用来确定XML（标准通用标记语言的子集）文档中某部分位置的语言

　　使用Jsoup的Xpath需要额外导入jar包 JsoupXpath-0.3.2.jar

　　查询w3cshool参考手册，使用xpath的语法完成查询

    /*
        Xpath查询
     */
    private static void XPathq() throws IOException, XpathSyntaxErrorException {
        //获取student.xml的path
        String path = Jsoup_3_Document.class.getClassLoader().getResource("student.xml").getPath();
        //获取Document对象
        Document document = Jsoup.parse(new File(path), "utf-8");
        //根据document对象，创建JXDocument对象
        JXDocument jxDocument = new JXDocument(document);
        //结合xpath语法查询
        //查询所有的student标签
        List<JXNode> jxNodes = jxDocument.selN("//student");
        for (JXNode jxNode : jxNodes) {
            System.out.println(jxNode);
        }
        System.out.println("================================");
        List<JXNode> jxNodes2 = jxDocument.selN("//student/name");
        for (JXNode jxNode2 : jxNodes2) {
            System.out.println(jxNode2);
        }
        System.out.println("================================");
        //查询student标签下带有id属性的name标签
        List<JXNode> jxNodes3 = jxDocument.selN("//student/name[@id]");
        for (JXNode jxNode3 : jxNodes3) {
            System.out.println(jxNode3);
        }
        System.out.println("================================");
        //查询student标签下带有id属性的name标签,并且id属性值为itcast
        List<JXNode> jxNodes4 = jxDocument.selN("//student/name[@id]");
        for (JXNode jxNode4 : jxNodes4) {
            System.out.println(jxNode4);
        }
    }

 

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