Node root = doc.getFirstChild();
        NodeList nodes = root.getChildNodes();
        for(int i=0;i<nodes.getLength();i++){
            NodeList ns = nodes.item(i).getChildNodes();
            for(int j=0;j<ns.getLength();j++){
                String s=ns.item(j).getTextContent();
                System.out.print(s+"   ");
            }
            System.out.println();
        }

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<students>
    <student>
        <name>lisi</name>
        <id>1001</id>
        <age>man</age>
    </student>
        <student>
        <name>zhangsan</name>
        <id>1002</id>
        <age>man</age>
    </student>
    <student>
        <name>wangwu</name>
        <id>1003</id>
        <age>man</age>
    </student>
    <student>
        <student>
            <name>haha</name>
            <student>
            <name>hehe</name>
            <id>1002</id>
            <age>woman</age>    
            </student>    
        </student>
    </student>
</students>