两个不同类型的对象中有字段名称不区分大小写的情况下一样，字段含义一样，需要组装到另一个对象中去，然后就写了一个这种工具类
我的类型比较特殊，老系统和新系统的对象命名大小写命名不一致，并且字段相同类型也有不一致的情况，所以自己写了一个，
不是很完美基本能用。
温馨提示：
如果同一种类型的对象 属性字段名equals相等 并且类型一致。则完全可以用commons-beanutils包或者spring包中
的BeanUtils工具类中的copey属性方法。
/** * 实体类字段值相同的复制 * * @author 隔壁老王 2017年8月18日 */ public class CopyBeanUtil { static Logger log = LoggerFactory.getLogger(CopyBeanUtil.class); /** * 复制sour里属性不为空的值到obje为空的属性 * * @param obje 目标实体类 * @param sour 源实体类 * @param isCover 是否保留obje类里不为null的属性值(true为保留源值，属性为null则赋值) * @return obje */ public static Object Copy(Object obje, Object sour, boolean isCover) { Field[] fields = sour.getClass().getDeclaredFields(); for (int i = 0, j = fields.length; i < j; i++) { String propertyName = fields[i].getName(); Object propertyValue = getProperty(sour, propertyName); if (isCover) { if (getProperty(obje, propertyName) == null && propertyValue != null) { Object setProperty = setProperty(obje, propertyName, propertyValue); } } else { Object setProperty = setProperty(obje, propertyName, propertyValue); } } return obje; } /** * 复制sour里属性不为空的值到obj里并相加 * * @param obj 目标实体类 * @param sour 源实体类 * @param isCover * @return obj */ public static Object CopyAndAdd(Object obj, Object sour, boolean isCover) { Field[] fields = sour.getClass().getDeclaredFields(); for (int i = 0, j = fields.length; i < j; i++) { String propertyName = fields[i].getName(); Object sourPropertyValue = getProperty(sour, propertyName); Object objPropertyValue = getProperty(obj, propertyName); if (isCover) { if (objPropertyValue == null && sourPropertyValue != null) { Object setProperty = setProperty(obj, propertyName, sourPropertyValue); } else if (objPropertyValue != null && sourPropertyValue == null) { Object setProperty = setProperty(obj, propertyName, objPropertyValue); } else if (objPropertyValue != null && sourPropertyValue != null) { Object setProperty = setProperty(obj, propertyName, ((int) sourPropertyValue) + (int) objPropertyValue); } } } return obj; } /** * 得到值 * * @param bean * @param propertyName * @return */ private static Object getProperty(Object bean, String propertyName) { Class clazz = bean.getClass(); try { Field field = clazz.getDeclaredField(propertyName); Method method = clazz.getDeclaredMethod(getGetterName(field.getName(),field.getType()), new Class[]{}); return method.invoke(bean, new Object[]{}); } catch (Exception e) { } return null; } /** * 给bean赋值 * * @param bean * @param propertyName * @param value * @return */ private static Object setProperty(Object bean, String propertyName, Object value) { Class clazz = bean.getClass(); try { Field field = clazz.getDeclaredField(propertyName); Method method = clazz.getDeclaredMethod(getSetterName(field.getName()), new Class[]{field.getType()}); return method.invoke(bean, new Object[]{value}); } catch (Exception e) { } return null; } /** * 根据变量名得到get方法 * * @param propertyName * @return */ private static String getGetterName(String propertyName) { String method ; if( propertyName.length()>1&& Character.isUpperCase(propertyName.charAt(1))){ method = "get" +propertyName; }else{ method = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); } return method; } /** * 根据变量名和类型获取getter方法 * @param propertyName * @param type * @return */ private static String getGetterName(String propertyName, Class<?> type) { String method ; if(type==Boolean.class|| type==boolean.class){ if("is".equalsIgnoreCase(propertyName.substring(0, 2))){ return propertyName; }else{ return "is" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); } } if( propertyName.length()>1&& Character.isUpperCase(propertyName.charAt(1))){ method = "get" +propertyName; }else{ method = "get" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); } return method; } /** * 得到setter方法 * * @param propertyName 变量名 * @return */ private static String getSetterName(String propertyName) { // String method = "set" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); String method ; if( propertyName.length()>1&& Character.isUpperCase(propertyName.charAt(1))){ method = "set" +propertyName; }else{ method = "set" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1); } return method; } /** * 父类集合转成子类集合集合通用方法(子类集合接收父类集合) * * @param list 父类集合 * @param <T> 子类 * @param <E> 父类 * @return */ public static <T, E> List<T> chang2ChildClassList(List<E> list) { List<T> alist = new ArrayList<>(); for (E o : list) { alist.add((T) o); } return alist; } /** * 属性copy 复制sour里属性和obje里属性值忽略大小写相同的 ，不为空的值赋值到obje里 * 如果存在属性复杂类型并为有效值慎用或改进 * * @param obje * @param sour * @param isCover 是否保留obje里面属性值不为空的字段值 * @return */ public static Object copyByIgnoreCase(Object obje, Object sour, boolean isCover) { try { Field[] objFields = obje.getClass().getDeclaredFields(); Field[] sourFields = sour.getClass().getDeclaredFields(); for (int i = 0; i < sourFields.length; i++) { String sourPropertyName = sourFields[i].getName(); //获取来源对象的属性值 Object propertyValue = getSourPropertyValue(sour, sourPropertyName); for (int j = 0; j < objFields.length; j++) { try { String objPropertyName = objFields[j].getName(); if (objPropertyName.equalsIgnoreCase(sourPropertyName)) { if (isCover) { if (getProperty(obje, objPropertyName) == null && propertyValue != null) { setObjProperty(obje, objPropertyName, propertyValue); } } else { setObjProperty(obje, objPropertyName, propertyValue); } break; } } catch (Exception e) { log.error("给目标bean赋值出错,objPropertyName:{},value:{}",sourPropertyName,propertyValue,e); e.printStackTrace(); } } } } catch (SecurityException e) { e.printStackTrace(); log.error("给目标bean赋值出错,obje:{},sour:{}", JSON.toJSONString(obje), JSON.toJSONString(sour),e); } return obje; } /** * 根据属性名获取的值 * * @param sourceBean * @param sourcePropertyName * @return */ private static Object getSourPropertyValue(Object sourceBean, String sourcePropertyName) { Class clazz = sourceBean.getClass(); try { Field field = clazz.getDeclaredField(sourcePropertyName); Method method = clazz.getDeclaredMethod(getGetterName(field.getName(),field.getType()), new Class[]{}); return method.invoke(sourceBean, new Object[]{}); } catch (Exception e) { log.error("获取属性名（不区分大小写）相似的值赋值出差", e); } return null; } /** * 给目标bean赋值 * * @param objBean * @param sourcePropertyName * @param value * @return */ private static Object setObjPropertyBySourceProperty(Object objBean, String sourcePropertyName, Object value) { Class clazz = objBean.getClass(); Field[] fields = clazz.getDeclaredFields(); try { for (int i = 0, j = fields.length; i < j; i++) { String propertyName = fields[i].getName(); if (sourcePropertyName.equalsIgnoreCase(propertyName)) { Field field = clazz.getDeclaredField(propertyName); if (field.getType() == BigDecimal.class) { if (value instanceof String) { value = new BigDecimal(String.valueOf(value)); } else if (value instanceof Integer || value instanceof Double) { // 传double直接new BigDecimal，数会变大 value = BigDecimal.valueOf(Double.parseDouble(String.valueOf(value))); } } if (field.getType() == Double.class || field.getType() == double.class) { if (value instanceof BigDecimal) { DecimalFormat df = new DecimalFormat("#.000000"); Double v = Double.parseDouble(String.valueOf(value)); value = df.format(v); } } Method method = clazz.getDeclaredMethod(getSetterName(field.getName()), new Class[]{field.getType()}); return method.invoke(objBean, new Object[]{value}); } } } catch (Exception e) { } return null; } /** * 给目标bean赋值 * * @param objBean * @param propertyName * @param value * @return */ private static Object setObjProperty(Object objBean, String propertyName, Object value) { Class clazz = objBean.getClass(); try { Field field = clazz.getDeclaredField(propertyName); if (field.getType() == BigDecimal.class) { if (value instanceof String) { value = new BigDecimal(String.valueOf(value)); } else if (value instanceof Integer || value instanceof Double) { // 传double直接new BigDecimal，数会变大 value = BigDecimal.valueOf(Double.parseDouble(String.valueOf(value))); } } if (field.getType() == Double.class || field.getType() == double.class) { if (value instanceof BigDecimal) { DecimalFormat df = new DecimalFormat("#.000000"); Double v = Double.parseDouble(String.valueOf(value)); value =new BigDecimal(df.format(v)); } } if (field.getType() == Integer.class || field.getType() == int.class) { if (value instanceof Float) { value = Math.round(Float.parseFloat(String.valueOf(value))); } } Method method = clazz.getDeclaredMethod(getSetterName(field.getName()), new Class[]{field.getType()}); log.info("给目标bean赋值,propertyName:{},value:{}",propertyName,value); Object obj = method.invoke(objBean, new Object[]{value}); return obj; } catch (Exception e) { log.error("给目标bean赋值出错,propertyName:{},value:{}",propertyName,value,e); } return null; } public static void main(String[] args) { // ReAlarmResult re= new ReAlarmResult(); // re.setAlarmContent("sdfsdfsd"); // re.setBlat(2.234343); // re.setBlon(34.34324); // ReAlarmResult s = new ReAlarmResult(); // s.setAlarmContent("222"); // copyByIgnoreCase(s,re,true); // System.out.printf(JSON.toJSONString(s)); // BeanUtils.copyProperties(); //BeanUtils.copyProperties(); } }
