testxxx.java

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package junit.test;


import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;

import javax.persistence.EmbeddedId;

import org.junit.BeforeClass;
import org.junit.Test;

import com.itcast.bean.privilege.SystemPrivilege;

public class Testxxx {

	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
	}

	@Test
	public void getxxx(){
		String out = "o";
		try {
			PropertyDescriptor[] propertyDescriptors = Introspector.getBeanInfo(SystemPrivilege.class).getPropertyDescriptors();
			for(PropertyDescriptor propertydesc : propertyDescriptors){
				Method method = propertydesc.getReadMethod();
				if(method!=null && method.isAnnotationPresent(EmbeddedId.class)){					
					PropertyDescriptor[] ps = Introspector.getBeanInfo(propertydesc.getPropertyType()).getPropertyDescriptors();
					for(PropertyDescriptor p : ps) System.out.println(p.getName());
					
					out = "o."+ propertydesc.getName()+ "." + (!ps[1].getName().equals("class")? ps[1].getName(): ps[0].getName());
					break;
				}
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
        System.out.println("==="+ out);
	}
}