Maven

 <!-- DOM4J-->
 <dependency>
     <groupId>dom4j</groupId>
     <artifactId>dom4j</artifactId>
     <version>1.6.1</version>
</dependency>

DOM4J方法

public void dom4J(String xml) throws DocumentException {
        Document doc = null;
        try {
            doc = DocumentHelper.parseText(xml); // 将字符串转为XML
            Element rootElt = doc.getRootElement(); // 获取根节点
            System.out.println("根节点：" + rootElt.getName()); // 拿到根节点的名称
            Iterator iter = rootElt.elementIterator("Header"); // 获取根节点下的子节点Header
            // 遍历Header节点
            while (iter.hasNext()) {
                Element recordEle = (Element) iter.next();
                String RequestId = recordEle.elementTextTrim("RequestId"); // 拿到Header节点下的子节点RequestId值
            }
            Iterator iters2 = rootElt.elementIterator("Body"); ///获取根节点下的子节点body
            // 遍历body节点
            while (iters2.hasNext()) {
                Element recordEless = (Element) iters2.next();
                String ExchangeData = recordEless.elementTextTrim("ExchangeData"); // 拿到body节点下的子节点result值
            }
        } catch (DocumentException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

另外提供一个不是xml格式但以键值对方式出现的取值方法

    public static String findMsg(String forArgXml, String name)throws Exception {
        String a = "<" + name + ">";
        String c = "</" + name + ">";
        int b = forArgXml.indexOf(a);
        int e = forArgXml.indexOf(c);
        int d = name.length() + 2;
        if (forArgXml.length() > e && e > b + d) {
            return forArgXml.substring(b + d, e).trim();
        } else {
            return null;
        }
    }
    
	public static void main(String[] args) throws Exception {
		String data = "<name>张三</name><age>55</age>";
		// 打印结果为张三
		System.out.println(findMsg(data,"name"));
	}