java反射代码留存（invokeSetMethod、invokeGetMethod）

 

代码：

public class JavaBeanUtil {

    private static final Logger logger = LoggerFactory.getLogger(JavaBeanUtil.class);

    private static final String SET_METHOD_PREFIX = "set";
    private static final String GET_METHOD_PREFIX = "get";

    /**
     * @title invokeSetMethod
     * @description 反射设置字段值
     * @param: target
     * @param: fieldName
     * @param: param
     * @updateTime 2020-02-25 12:24
     * @return void
     */
    public static void invokeSetMethod(Object target, String fieldName, Object param) {
        if (param == null) {
            logger.error("param == null");
            return;
        }
        Class targetClass = target.getClass();
        String methodName = SET_METHOD_PREFIX + StringUtils.upperFirstChar(fieldName);
        try {
            Method setMethod = targetClass.getDeclaredMethod(methodName, param.getClass());
            setMethod.invoke(target, param);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            logger.error(String.format("未在类型:%s中找到名为:%s的方法", targetClass.getSimpleName(), methodName), e);
        } catch (IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
            logger.error(String.format("%s.%s方法执行错误", targetClass.getSimpleName(), methodName), e);
        }
    }

    /***
     * @title invokeGetMethod
     * @description 反射获取字段值
     * @param: target
     * @param: fieldName
     * @updateTime 2020-02-25 12:24
     * @return java.lang.Object
     */
    public static Object invokeGetMethod(Object target, String fieldName) {
        Class targetClass = target.getClass();
        String methodName = GET_METHOD_PREFIX + StringUtils.upperFirstChar(fieldName);
        try {
            Method getMethod = targetClass.getDeclaredMethod(methodName);
            return getMethod.invoke(target);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
            logger.error(String.format("未在类型:%s中找到名为:%s的方法", targetClass.getSimpleName(), methodName), e);
        } catch (IllegalAccessException | InvocationTargetException e) {
            e.printStackTrace();
            logger.error(String.format("%s.%s方法执行错误", targetClass.getSimpleName(), methodName), e);
        }
        return null;
    }


    /***
     * @title attributeCopy
     * @description 属性拷贝，null 不拷贝
     * @param: source
     * @param: target
     * @updateTime 2020-02-25 12:23
     * @return void
     */
    public static void attributeCopy(Object source, Object target) {
        Class sourceClass = source.getClass();
        Class targetClass = target.getClass();
        Field[] sourceFields = sourceClass.getDeclaredFields();
        Field[] targetFields = targetClass.getDeclaredFields();
        for (Field sourceField : sourceFields) {
            Object sourceValue = invokeGetMethod(source, sourceField.getName());
            if (sourceValue == null) {
                continue;
            }
            for (Field targetField : targetFields) {
                if (sourceField.getName().equals(targetField.getName())) {
                    invokeSetMethod(target, targetField.getName(), sourceValue);
                }
            }
        }

    }

}

 

测试：

public class JavaBeanUtilTest {

    @Test public void invokeSetMethod() {
        CaseRefundEntity entity = new CaseRefundEntity();
        String filedName = "submitStaffId";
        JavaBeanUtil.invokeSetMethod(entity, filedName, 3434L);
//        JavaBeanUtil.invokeSetMethod(entity, "submitStaffId", 3434);
        System.out.println(entity.getSubmitStaffId());


    }

    @Test public void invokeGetMethod() {
        CaseRefundEntity entity2 = new CaseRefundEntity();
        String filedName = "submitStaffId";
        entity2.setSubmitStaffId(222L);
        System.out.println(JavaBeanUtil.invokeGetMethod(entity2, filedName));

    }

    @Test public void attributeCopy() {
        CaseRefundEntity entity2 = new CaseRefundEntity();
        entity2.setSubmitStaffId(222L);
        entity2.setId(223343L);
        CaseRefundEntity entity = new CaseRefundEntity();
        JavaBeanUtil.attributeCopy(entity2, entity);
        System.out.println(entity.toString());
        System.out.println(entity2.toString());
    }

}