利用反射拷贝实体bean的字段

程序实现的功能：将实体bean2的属性值拷贝至bean1，前提是bean2的属性存在于bean1

 

主方法

public static Object copyObject(Object obj1,Object obj2) throws Exception{//得到object1类型全部属性Class classType1 = obj1.getClass();Field fields1[] = classType1.getDeclaredFields();//得到object1类型全部属性Class classType2 = obj2.getClass();Field fields2[] = classType2.getDeclaredFields();//复制for (int i = 0 ; i<fields2.length ;i++){String fieldName2 = fields2[i].getName();//判断obj1中有无obj2属性if(hasField(fields1, fieldName2)){ //set Or get 方法Method getMethod= getMethodByGet(classType2, fieldName2);Method setMethod= getMethodBySet(classType1, fieldName2, fields2[i]);//拷贝obj2 to obj1,去空值try{Object value = getMethod.invoke(obj2, new Object[]{});if(value != null)setMethod.invoke(obj1, new Object[]{value});}catch(Exception E){continue;}}}return obj1;}

get，set方法

/** * 得到get方法 * @param classType2 * @param fieldName2 * @throws NoSuchMethodException */private static Method getMethodByGet(Class classType, String fieldName) throws NoSuchMethodException {//第一个字母大写String firestLetter = fieldName.substring(0,1).toUpperCase();//得到getXXX方法名String methodName = "get" + firestLetter + fieldName.substring(1);//得到对应的方法Method method = classType.getMethod(methodName,new Class[]{});return method;}/** * 得到set方法 * @param classType * @param fieldName * @return * @throws NoSuchMethodException */private static Method getMethodBySet(Class classType, String fieldName, Field type) throws NoSuchMethodException {//第一个字母大写String firestLetter = fieldName.substring(0,1).toUpperCase();//得到getXXX方法名String methodName = "set" + firestLetter + fieldName.substring(1);//得到对应的方法Method method = classType.getMethod(methodName,new Class[]{type.getType()});return method;}

判断属性是否存在

/** * 判断有无属性 * @param fields1 * @param fieldName2 */private static boolean hasField(Field[] fields, String fieldName) {for (int j = 0 ; j < fields.length ; j++){if(fieldName.equalsIgnoreCase(fields[j].getName())){return true;}}return false;}