java反射应用

使用JAVA反应进行两个vo有相同字段名字进行子转换：

@Test     public void doTransTest() {         A a= new A();         A.setC(111L);           B b= new B();         doTrans(a, b);     }       /**     *@param sour 来源vo     *@param dest 待转换vo     */     public void doTrans(Object sour, Object dest) {         if (sour == null) {             dest = null;             return;         }     //反射原理应用         Class<?> sourceClass = sour.getClass();         Class<?> destClass = dest.getClass();         for (Field field : sourceClass.getDeclaredFields()) {               String fieldName = field.getName();             Object value;               if (fieldName.equals("serialVersionUID")) {                 continue;             }               try {                 PropertyDescriptor propertyDescriptor = new PropertyDescriptor(fieldName, sourceClass);                 value = propertyDescriptor.getReadMethod().invoke(sour);             } catch (Exception e) {                 //log                 continue;             }               if (value == null) {                 continue;             }             try {                 PropertyDescriptor propertyDescriptor = new PropertyDescriptor(fieldName, destClass);                 propertyDescriptor.getWriteMethod().invoke(dest, value);             } catch (Exception e) {                 //log                 continue;             }         }     }

SpringIOC反射的应用：

 /**      * springIOC和反射test      *      * @throws Exception      */     @Test     public void reflexTest() throws Exception {           /**          * 第一步，springIOC解析如下bean          *  <bean id="cartBean" class="com.mmall.pojo.Cart"></bean>          */         //解析bean字符串xxxxx         String beanId = "cartBean";         String beanClass = "com.mmall.pojo.Cart";         Class<?> cls = Class.forName(beanClass);         Object object = cls.newInstance();         //模拟spring容器         Map container = Maps.newHashMap();         //bean注入spring容器,实例化成功         container.put(beanId, object);             /**          * 第二步：模拟ref注入          *      <bean id="cartBean" class="com.mmall.pojo.Cart"></bean>          *          <property name="user" ref="userBean"></property>          *      <bean>          */         //初始化refBean(userBean)         String beanIdUser = "cartBean";         String beanClassUser = "com.mmall.pojo.User";         Class<?> clsUser = Class.forName(beanClassUser);         Object objectUser = clsUser.newInstance();         //并注入spring容器         container.put(beanIdUser,objectUser);           //得到cartBean的setUser方法         String setUserName = "setUser";         Object paramBean = container.get(beanIdUser);         //cls是cart对象         Method setter = cls.getMethod(setUserName, objectUser.getClass());         //注入set方法         setter.invoke(object, paramBean);     }

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