应用dom4j读取xml的例子

1. 样例xml

<?xml version="1.0" encoding="UTF-8"?>
<students>
    <student>
        <name type="String">aaa</name>
        <age  type="int">22</age>
    </student>
    <student>
        <name type="String">bbb</name>
        <age  type="int">23</age>
    </student>
    <student>
        <name type="String">ccc</name>
        <age  type="int">21</age>
    </student>
</students>

2. 读入各种形式的xml

2.1 读入文件

	SAXReader reader = new SAXReader();
	Document document = reader.read(new File("d:/tmp/3.xml"));

2.2 读入文件内容（字符串）

String text = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><students>    <student>        <name type=\"String\">aaa</name>        <age  type=\"int\">22</age>    </student>    <student>        <name type=\"String\">bbb</name>        <age  type=\"int\">23</age>    </student>    <student>        <name type=\"String\">ccc</name>        <age  type=\"int\">21</age>    </student></students>";

Document document = DocumentHelper.parseText(text);

2.3 读入网络URL

	String url = "http://www.webservicex.net/globalweather.asmx?wsdl";
	SAXReader reader = new SAXReader();
	URL realUrl = new URL(url);
	Document document = reader.read(realUrl);

3. 获得节点与属性

在得到document之后，可以得到该xml的所有节点与属性。

		Element rootElement = document.getRootElement();
		if (rootElement == null) {
			return "";
		}
		Element se = rootElement.element("types");
		if (se == null) {
			return "";
		}
		Element se1 = se.element("schema");
		if (se1 == null) {
			return "";
		}
		Element se2 = se1.element("element");
		if (se2 == null) {
			return "";
		}
		return se2.attributeValue("name");