初始化提交
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package business.cooperop.common.utils;
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/*
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**********************************************
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* DATE PERSON REASON
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* 2020/9/4 FXY Created
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**********************************************
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*/
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import com.esotericsoftware.reflectasm.MethodAccess;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.*;
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import java.util.function.Function;
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import java.util.stream.Collectors;
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/**
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* 待重写
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*/
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public class BeanUtilsV2 {
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/**
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* 通过 ASM反射 速度比 Spring BeanUtils.copyProperties(source,target) 快一倍
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* 类型不同可以转换
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* 大小写可以忽略
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* 下划线 _ 被忽略
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* fxy备注：需要操纵字节码，服务器没有性能瓶颈的情况下慎用！
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*
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* @param source 数据源
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* @param target 目标是数据
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* @param <T>
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* @return
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*/
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public static <T> T copyPropertiesASM(Object source, Object target) {
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MethodAccess sourceMethodAccess = CacheMethodAccess.getMethodAccess(source.getClass());
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MethodAccess targetMethodAccess = CacheMethodAccess.getMethodAccess(target.getClass());
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Map<String, String> sourceGet = CacheAsmFiledMethod.getMethod("get", source.getClass());
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Map<String, String> targetSet = CacheAsmFiledMethod.getMethod("set", target.getClass());
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CacheFieldMap.getFieldMap(target.getClass()).keySet().forEach((it) -> {
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String sourceIndex = sourceGet.get(it);
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if (sourceIndex != null) {
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Object value = sourceMethodAccess.invoke(source, sourceIndex);
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String setIndex = targetSet.get(it);
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targetMethodAccess.invoke(target, setIndex, value);
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}
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});
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return (T) target;
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}
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/**
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* 模仿Spring中 BeanUtils.copyProperties(source,target)
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* 目前仅支持整形到布尔类型的单向转换
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* 但是
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* 大小写可以忽略
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* 下划线 _ 被忽略
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*
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* @param source
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* @param target
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* @param <T>
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* @return
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*/
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public static <T> T copyProperties(Object source, Object target) {
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Map<String, Field> sourceMap = CacheFieldMap.getFieldMap(source.getClass());
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CacheFieldMap.getFieldMap(target.getClass()).values().forEach((it) -> {
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Field field = sourceMap.get(it.getName().toLowerCase().replace("_", ""));
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if (field != null) {
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it.setAccessible(true);
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field.setAccessible(true);
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try {
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if (field.getType() == Integer.class && it.getType() == Boolean.class) {
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it.set(target, (Integer) field.get(source) == 1 ? true : false);
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} else {
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it.set(target, field.get(source));
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}
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} finally {
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//及时关闭访问权限
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field.setAccessible(false);
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it.setAccessible(false);
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}
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}
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});
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return (T) target;
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}
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/**
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* @param source 源对象
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* @param target 目标对象
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* @param ignores 需要忽略的字段数组元素
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* @param <T> 返回赋了值的目标对象
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* 目前不同类型之间的转换，仅支持整形向布尔类型的单向转换
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* @return
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*/
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public static <T> T copyProperties(Object source, Object target, String... ignores) {
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Map<String, Field> sourceMap = CacheFieldMap.getFieldMap(source.getClass(), ignores);
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CacheFieldMap.getFieldMap(target.getClass()).values().forEach((it) -> {
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Field field = sourceMap.get(it.getName().toLowerCase().replace("_", ""));
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if (field != null) {
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it.setAccessible(true);
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field.setAccessible(true);
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try {
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if (field.getType() == Integer.class && it.getType() == Boolean.class) {
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it.set(target, (Integer) field.get(source) == 1 ? true : false);
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} else {
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it.set(target, field.get(source));
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}
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} finally {
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field.setAccessible(false);
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it.setAccessible(false);
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}
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}
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});
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return (T) target;
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}
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/**
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* Asm方式缓存变量域到map中，待优化
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* 可以将加锁操作换做无阻塞的并发容器
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*/
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private static class CacheAsmFiledMethod {
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private static Map<String, Map<String, String>> cacheGetMethod = new HashMap<>();
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private static Map<String, Map<String, String>> cacheSetMethod = new HashMap<>();
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private static Map<String, String> getMethod(String type, Class clazz) {
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MethodAccess methodAccess = CacheMethodAccess.getMethodAccess(clazz);
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Map<String, Field> allFields = CacheFieldMap.getFieldMap(clazz);
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Map<String, String> result = null;
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if (type.equals("get")) {
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result = cacheGetMethod.get(clazz.getName());
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} else if (type.equals("set")) {
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result = cacheSetMethod.get(clazz.getName());
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}
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if (result == null) {
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synchronized (CacheAsmFiledMethod.class) {
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if (result == null) {
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Map<String, String> set = new HashMap<>();
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Map<String, String> get = new HashMap<>();
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allFields.values().forEach((it) -> {
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//判断是否是静态
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if (!Modifier.isStatic(it.getModifiers())) {
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//首字母大写
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char[] f = it.getName().toCharArray();
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f[0] -= 32;
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String fieldName = new String(f);
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get.put(fieldName.toLowerCase().replace("_", ""), "get" + fieldName);
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set.put(fieldName.toLowerCase().replace("_", ""), "set" + fieldName);
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}
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});
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cacheGetMethod.put(clazz.getName(), get);
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cacheSetMethod.put(clazz.getName(), set);
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if (type.equals("get")) {
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result = cacheGetMethod.get(clazz.getName());
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} else if (type.equals("set")) {
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result = cacheSetMethod.get(clazz.getName());
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}
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}
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}
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}
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return result;
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}
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}
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/**
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* 缓存方法访问权限容器，加锁操作待优化
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*/
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private static class CacheMethodAccess {
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private CacheMethodAccess() {
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}
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private static Map<String, MethodAccess> cache = new HashMap<>();
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private static MethodAccess getMethodAccess(Class clazz) {
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MethodAccess result = cache.get(clazz.getName());
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if (result == null) {
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synchronized (CacheMethodAccess.class) {
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if (result == null) {
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cache.put(clazz.getName(), MethodAccess.get(clazz));
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result = cache.get(clazz.getName());
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}
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}
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}
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return result;
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}
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}
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/**
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* 缓存所有域到map中，加锁操作待优化
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*/
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private static class CacheFieldMap {
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private static Map<String, Map<String, Field>> cacheMap = new HashMap<>();
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private static Map<String, Field> getFieldMap(Class clazz) {
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Map<String, Field> result = cacheMap.get(clazz.getName());
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if (result == null) {
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synchronized (CacheFieldMap.class) {
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if (result == null) {
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List<Field> allFields = getAllFields(clazz);
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Map<String, Field> fieldMap = allFields.stream().collect(Collectors.toMap(field -> field.getName().toLowerCase().replace("_", ""), Function.<Field>identity()));
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cacheMap.put(clazz.getName(), fieldMap);
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result = cacheMap.get(clazz.getName());
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}
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}
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}
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return result;
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}
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/**
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* 每次反射完成后将数据存放在内存中
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*
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* @param clazz
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* @param ignores
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* @return
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*/
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private static Map<String, Field> getFieldMap(Class clazz, String... ignores) {
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Map<String, Field> result = cacheMap.get(clazz.getName());
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List<String> list = Arrays.asList(ignores);
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if (result == null) {
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synchronized (CacheFieldMap.class) {
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if (result == null) {
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List<Field> allFields = getAllFields(clazz);
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Map<String, Field> fieldMap = allFields.stream().filter(a -> !(list.contains(a.getName()))).collect(Collectors.toMap(field -> field.getName().toLowerCase().replace("_", ""), Function.<Field>identity()));
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cacheMap.put(clazz.getName(), fieldMap);
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result = cacheMap.get(clazz.getName());
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}
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}
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}
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return result;
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}
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}
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/**
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* 得到包括继承而来的所有域
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*
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* @param clazz
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* @return
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*/
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private static List<Field> getAllFields(Class clazz) {
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List<Field> fieldList = new ArrayList<>();
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while (clazz != null && !clazz.getName().toLowerCase().equals("java.lang.object")) {
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fieldList.addAll(Arrays.asList(clazz.getDeclaredFields()));
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clazz = clazz.getSuperclass();
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}
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return fieldList;
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}
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}
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