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一、修改对象属性

效果：

/*** Description:* date: 2020/11/26* 修改对象的属性 更新信息工具类* @param : tClass 实体类class* @param : fieldName 实体类属性名* @param : values 修改的内容* @return : 失败返回hashMap格式;成功返回实体类* @author: qkj*/public static Object modifyEntityInfo(Class<?> tClass, String fieldName, Object values) throws Exception {Method[] declaredMethods = tClass.getDeclaredMethods();int length = declaredMethods.length;Constructor<?> constructor = tClass.getConstructor();Object instance = constructor.newInstance();List<String> methodNameList = new ArrayList<String>();for (int i = 0; i < length; i++) {declaredMethods[i].setAccessible(true);methodNameList.add(declaredMethods[i].getName().toUpperCase());}boolean contains = methodNameList.contains("SET" + fieldName.toUpperCase());if (!contains) {Map<String, String> map = new HashMap<String, String>();map.put("errorMsg", "字段名错误或者实体类不存在set方法");return map;} else {Method realMethod = null;for (int i = 0; i < length; i++) {declaredMethods[i].setAccessible(true);if (declaredMethods[i].getName().equalsIgnoreCase("SET" + fieldName)) {realMethod = declaredMethods[i];break;}}realMethod.invoke(instance, values);return instance;}}

二、对象互换属性值

实际应用场景：属性值互换 并忽略某几项（例如id不用互换）
将动态参数，反射，动态代理，反序列化，深拷贝结合在一起的一个方法

//注意需要jackson包  或者自己将实体类继承序列化、克隆等接口也行，深拷贝时用到,将深拷贝部分的代码重新写一下
import com.fasterxml.jackson.databind.ObjectMapper;/*** Description: 对象信息互换* date: 2020/11/26* @param : object1 object2互换对象* @param : ...param 需要忽略互换的字段* @return : 失败返回hashMap格式;成功返回实体类list* @author: qkj*/public static Object exchangeEntityInfo(Object object1, Object object2, Object... param) throws Exception {Class aClass1 = object1.getClass();Class aClass2 = object2.getClass();if (aClass1 != aClass2) {Map<String,String> map = new HashMap<String, String>();map.put("error", "类型不一致");return map;}ObjectMapper objectMapper = new ObjectMapper();Object temp1 = objectMapper.readValue(objectMapper.writeValueAsString(object1), object1.getClass());Object temp2 = objectMapper.readValue(objectMapper.writeValueAsString(object2), object2.getClass());object1 = object2;object2 = temp1;// 所有属性Field[] declaredFields = object1.getClass().getDeclaredFields();// 所有方法Method[] declaredMethods = object1.getClass().getDeclaredMethods();ArrayList<Object> objects = new ArrayList<>();// 循环无需替换的参数for (int i = 0; i < param.length; i++) {// 循环交换后对象的方法for (Method method : declaredMethods) {method.setAccessible(true);// 如果方法名相等 则把旧数据set回去if (method.getName().equalsIgnoreCase("SET" + param[i])) {for (Field field : declaredFields) {if (field.getName().equals(param[i])) {method.invoke(object1, field.get(temp1));}}for (Field field : declaredFields) {if (field.getName().equals(param[i])) {method.invoke(object2, field.get(temp2));}}}}}objects.add(object1);objects.add(object2);return objects;}