package dom4jtest;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.util.List;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;public class Test3 {    private static Object o1;    public static void main(String[] args) {        BeanA ba = (BeanA) getBean("beanA");        ba.getBeanB().show();    }    public static Object getBean(String name){        if(o1==null)            o1 = setBean(name);        return o1;    }    @SuppressWarnings("unchecked")    public static Object setBean(String name){        SAXReader sr = new SAXReader();        Object o = null;        Class clz = null;        Class clz2 = null;        String ref = null;        String name1 = null;        try {            Document doc = sr.read(Test3.class.getClassLoader().getResourceAsStream("beans.xml"));            Element e = doc.getRootElement();            @SuppressWarnings("unchecked")            List<Element> eles = e.elements();            for(Element ee : eles){                if(ee.attributeValue("id")!=null){                    if(ee.attributeValue("id").equals(name)){                        clz = Class.forName(ee.attributeValue("class"));                        o = clz.newInstance();                                            List<Element> elus = ee.elements("property");                        ref = elus.get(0).attributeValue("ref");                        name1 = elus.get(0).attributeValue("name");                        if(ref!=null&&name1!=null){                            for(Element eee:eles){                                if(eee.attributeValue("id")!=null){                                    if(eee.attributeValue("id").equals(ref)){                                        clz2 = Class.forName(eee.attributeValue("class"));                                        name1 ="set"+ name1.substring(0, 1).toUpperCase() + name1.substring(1);                                        Method m = clz.getDeclaredMethod(name1,clz2);                                        m.invoke(o, clz2.newInstance());                                    }                                                                    }                            }                        }                                            }                }            }        } catch (DocumentException e) {            e.printStackTrace();        } catch (ClassNotFoundException e1) {            e1.printStackTrace();        } catch (InstantiationException e1) {            e1.printStackTrace();        } catch (IllegalAccessException e1) {            e1.printStackTrace();        } catch (IllegalArgumentException e1) {            e1.printStackTrace();        }         catch (InvocationTargetException e1) {            e1.printStackTrace();        } catch (NoSuchMethodException e1) {            e1.printStackTrace();        }         catch (SecurityException e1) {            e1.printStackTrace();        }        return o;        }}