java 经典反射类加测试类
反射类

package util;import java.lang.reflect.Field;import java.lang.reflect.Method;import test.web.example.PP;/** *  * @author peidw * */public class Reflection {        /**     * 取得参数对象中的公共属性     * @param obj     * @param fieldname     * @return     * @throws Exception     */    public Object getProperty(Object obj,String fieldname)throws Exception{        Object result=null;        Class objClass=obj.getClass();        Field field=objClass.getField(fieldname);        result=field.get(obj);        return result;    }    /**     * 获得某类的静态属性     * @param className     * @param fieldName     * @return     * @throws Exception     */    public Object getStaticProperty(String className,String fieldName)throws Exception{        Class cls=Class.forName(className);        Field field=cls.getField(fieldName);        Object provalue=field.get(cls);        return provalue;    }    /**     * 获取参数对象的属性值     * @param obj     * @param propertyName     * @return     * @throws Exception     */    public Object getPrivatePropertyValue(Object obj,String propertyName)throws Exception{        Class cls=obj.getClass();        Field field=cls.getDeclaredField(propertyName);        field.setAccessible(true);        Object retvalue=field.get(obj);        return retvalue;    }        /**     * 执行某对象的方法     * @param owner     * @param methodName     * @param args     * @return     * @throws Exception     */    public Object invokeMethod(Object owner,String methodName,Object[] args)throws Exception{        Class cls=owner.getClass();        Class[] argclass=new Class[args.length];        for(int i=0,j=argclass.length;i<j;i++){            argclass[i]=args[i].getClass();        }        Method method=cls.getMethod(methodName,argclass);        return method.invoke(owner, args);    }        /**     * 执行静态类的方法     * @param className     * @param methodName     * @param args     * @return     * @throws Exception     */    public Object invokeStaticMethod(String className,String methodName,Object[] args)throws Exception{        Class cls=Class.forName(className);        Class[] argclass=new Class[args.length];        for(int i=0,j=argclass.length;i<j;i++){            argclass[i]=args[i].getClass();        }        Method method=cls.getMethod(methodName,argclass);        return method.invoke(null, args);    }    public Object newInstance(String className,Object[] args)throws Exception{        Class clss=Class.forName(className);            Class[] argclass=new Class[args.length];        for(int i=0,j=argclass.length;i<j;i++){            argclass[i]=args[i].getClass();        }        java.lang.reflect.Constructor cons=clss.getConstructor(argclass);        return cons.newInstance();    }    public static void main(String[] args)throws Exception{        Reflection rl=new Reflection();        PP p=new PP();        rl.getPrivatePropertyValue(p,"aname");    }}

package test.web.example;import static org.junit.Assert.*;import org.junit.Before;import org.junit.Test;import org.junit.Assert.*;import util.Reflection;/** *  * @author peidw * */public class ReflectionTest {        private PP pp=null;    private Reflection reflection=null;    @Before    public void setUp() throws Exception {        reflection=new Reflection();        pp=new PP();            }    @Test    public void testGetProperty() throws Exception{        System.out.println(pp);        System.out.println(reflection);        System.out.println(reflection.getProperty(pp, "address"));        //assertEquals(reflection.getProperty(pp, "address"), null);            }    @Test    public void testGetStaticProperty()throws Exception{        assertEquals(reflection.getStaticProperty("test.web.example.PP", "count"),"love you");    }    @Test    public void testGetPrivatePropertyValue() throws Exception{        assertEquals(reflection.getPrivatePropertyValue(pp, "aname"),null);    }    @Test    public void testInvokeMethod() throws Exception{        assertEquals(reflection.invokeMethod(pp, "setAddress", new Object[]{"合浦西场镇"}),null);        assertEquals(reflection.getProperty(pp, "address"), "合浦西场镇");    }    @Test    public void testInvokeStaticMethod()throws Exception {        assertEquals(reflection.invokeStaticMethod("test.web.example.PP", "changeCount",new Object[]{"80"}),true);        assertEquals(reflection.getStaticProperty("test.web.example.PP", "count"),"80");    }    @Test    public void testNewInstance() throws Exception{                Object vpp=reflection.newInstance("test.web.example.PP",new Object[]{"peidw","广州"});        org.junit.Assert.assertNotNull(vpp);        //assertEquals(reflection.getPrivatePropertyValue(vpp,"aname"),"peidw");    }}