package com.jilongda.common.utils;
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import org.springframework.beans.BeanUtils;
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import org.springframework.beans.BeanWrapper;
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import org.springframework.beans.BeanWrapperImpl;
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import java.lang.reflect.Field;
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import java.util.HashSet;
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import java.util.Map;
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import java.util.Set;
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/**
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* @author xiaochen
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* @ClassName SpringUtils
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* @Description
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* @date 2021-06-17 15:37
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*/
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public class SpringUtils {
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/**
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* 对象属性复制
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*
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* @param a
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* @param clazz
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* @param <A>
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* @param <B>
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* @return
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*/
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public static <A, B> B beanCopy(A a, Class<B> clazz) {
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try {
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B b = clazz.newInstance();
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BeanUtils.copyProperties(a, b);
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return b;
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} catch (InstantiationException | IllegalAccessException e) {
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throw new RuntimeException("获取对象实例失败");
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}
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}
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/**
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* 对象属性复制
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*
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* @param a
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* @param a
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* @param <A>
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* @param <B>
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* @return
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*/
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public static <A, B> B beanCopy(A a, B b) {
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BeanUtils.copyProperties(a, b);
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return b;
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}
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public static <A, B> B beanCopyNotNull(A a, B b) {
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BeanUtils.copyProperties(a, b, getNullPropertyNames(a));
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return b;
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}
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/**
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* 只拷贝不为null的属性
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*
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* @param source
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* @return java.lang.String[]
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* @author xiaochen
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* @date 2022-01-04 18:27
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*/
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public static String[] getNullPropertyNames(Object source) {
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final BeanWrapper src = new BeanWrapperImpl(source);
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java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();
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Set<String> emptyNames = new HashSet<String>();
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for (java.beans.PropertyDescriptor pd : pds) {
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Object srcValue = src.getPropertyValue(pd.getName());
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if (srcValue == null) {
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emptyNames.add(pd.getName());
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}
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}
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String[] result = new String[emptyNames.size()];
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return emptyNames.toArray(result);
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}
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/**
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* 利用反射将map集合封装成bean对象
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*
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* @param map
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* @param clazz
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* @return
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*/
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public static <T> T mapToBean(Map<String, Object> map, Class<?> clazz) throws Exception {
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Object obj = clazz.newInstance();
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if (map != null && !map.isEmpty() && map.size() > 0) {
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for (Map.Entry<String, Object> entry : map.entrySet()) {
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// 属性名
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String propertyName = entry.getKey();
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// 属性值
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Object value = entry.getValue();
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String setMethodName = "set" + propertyName.substring(0, 1).toUpperCase() + propertyName.substring(1);
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//获取和map的key匹配的属性名称
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Field field = getClassField(clazz, propertyName);
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if (field == null) {
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continue;
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}
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Class<?> fieldTypeClass = field.getType();
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value = convertValType(value, fieldTypeClass);
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try {
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clazz.getMethod(setMethodName, field.getType()).invoke(obj, value);
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} catch (NoSuchMethodException e) {
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e.printStackTrace();
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}
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}
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}
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return (T) obj;
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}
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/**
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* 根据给定对象类匹配对象中的特定字段
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*
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* @param clazz
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* @param fieldName
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* @return
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*/
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private static Field getClassField(Class<?> clazz, String fieldName) {
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if (Object.class.getName().equals(clazz.getName())) {
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return null;
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}
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Field[] declaredFields = clazz.getDeclaredFields();
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for (Field field : declaredFields) {
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if (field.getName().equals(fieldName)) {
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return field;
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}
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}
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//如果该类还有父类，将父类对象中的字段也取出
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Class<?> superClass = clazz.getSuperclass();
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//递归获取
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if (superClass != null) {
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return getClassField(superClass, fieldName);
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}
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return null;
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}
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/**
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* 将map的value值转为实体类中字段类型匹配的方法
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*
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* @param value
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* @param fieldTypeClass
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* @return
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*/
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private static Object convertValType(Object value, Class<?> fieldTypeClass) {
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Object retVal;
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if (Long.class.getName().equals(fieldTypeClass.getName())
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|| long.class.getName().equals(fieldTypeClass.getName())) {
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retVal = Long.parseLong(value.toString());
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} else if (Integer.class.getName().equals(fieldTypeClass.getName())
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|| int.class.getName().equals(fieldTypeClass.getName())) {
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retVal = Integer.parseInt(value.toString());
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} else if (Float.class.getName().equals(fieldTypeClass.getName())
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|| float.class.getName().equals(fieldTypeClass.getName())) {
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retVal = Float.parseFloat(value.toString());
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} else if (Double.class.getName().equals(fieldTypeClass.getName())
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|| double.class.getName().equals(fieldTypeClass.getName())) {
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retVal = Double.parseDouble(value.toString());
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} else {
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retVal = value;
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}
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return retVal;
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}
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}
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