比如想把 A （以下称modelWantToCast）的所有字段 赋值给B（以下称modelCastTo） 【需要字段名一样】

    public static <T> T castModelToAnotherModel(Object modelWantToCast, Class<T> modelCastToClazz) {if (modelWantToCast == null) {return null;}// 粗暴地获取A的所有方法Method[] dtoMethod = modelWantToCast.getClass().getDeclaredMethods();String getMethodName;T modelCastTo = null;try {// 实例化这个BmodelCastTo = modelCastToClazz.newInstance();} catch (InstantiationException | IllegalAccessException e) {e.printStackTrace();}for (Method getMethod : dtoMethod) {getMethodName = getMethod.getName();if (getMethodName.indexOf("get", 0) == -1) {continue;}...... 代码在下面}return modelCastTo;}

1、之前经常用的很逗的方法

• 获取它的get set方法
• 从A中get出来
• 通过set方法set到A中去

            String setMethodName = "set" + getMethodName.substring(3, getMethodName.length());// 获取set方法名字Object value = null;// 取值try {value = getMethod.invoke(modelWantToCast);} catch (IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}Class parameterTypes = getMethod.getReturnType();// 取参数的类Method setMethod;try {// 获取set方法setMethod = modelCastToClazz.getDeclaredMethod(setMethodName, parameterTypes);} catch (NoSuchMethodException | SecurityException e) {continue;}try {// 粗暴地invoke进去setMethod.invoke(modelCastTo, value);} catch (IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}

2、后来发现还有更加粗暴的方法

• 获取对象它get方法
• 从A中get出来
• 从field直接set进去

            try {Object value = getMethod.invoke(modelWantToCast);// 取值if (value == null) {continue;}String fileName = getFileNameFromGetterOrSetter(getMethodName); // 从get方法获取属性名Field field = modelCastToClazz.getDeclaredField(fileName);field.setAccessible(true);field.set(modelCastTo, value);// 直接塞进去} catch (NoSuchFieldException | IllegalAccessException | InvocationTargetException e) {e.printStackTrace();}