BeanUtils实现忽略大小写的copyProperties

导入依赖

 
            com.esotericsoftware
            reflectasm
            1.11.7
        

下面是代码

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import com.esotericsoftware.reflectasm.MethodAccess;

/**
 * 此类主要用于反射，对反射的一些操作进行缓存起来。
 *
 * @author 
 * @date 
 */
public class BeanUtils {
    
    /**
     * 通过 ASM反射 速度比 Spring BeanUtils.copyProperties(source,target) 快一倍
     * 类型不同可以转换
     * 大小写可以忽略
     * 下划线 _ 被忽略
     *
     * @param source 数据源
     * @param target  目标是数据
     * @param 
     * @return
     */
    public static  T copyPropertiesASM( Object source, Object target ) {
        MethodAccess sourceMethodAccess = CacheMethodAccess.getMethodAccess(source.getClass());
        MethodAccess targetMethodAccess = CacheMethodAccess.getMethodAccess(target.getClass());
        Map sourceGet = CacheAsmFiledMethod.getMethod("get", source.getClass());
        Map targetSet = CacheAsmFiledMethod.getMethod("set", target.getClass());
        CacheFieldMap.getFieldMap(target.getClass()).keySet().forEach((it) -> {
            String sourceIndex = sourceGet.get(it);
            if (sourceIndex != null) {
                Object value = sourceMethodAccess.invoke(source, sourceIndex);
                String setIndex = targetSet.get(it);
                targetMethodAccess.invoke(target, setIndex, value);
            }
        });
        return (T) target;
    }

    /**
     *  模仿Spring中 BeanUtils.copyProperties(source,target)
     *类型不同不可以转换
     *  但是
     * 大小写可以忽略
     * 下划线 _ 被忽略
     * @param source
     * @param target
     * @param 
     * @return
     */
    public static  T copyProperties(Object source, Object target) {
        Map sourceMap = CacheFieldMap.getFieldMap(source.getClass());
        CacheFieldMap.getFieldMap(target.getClass()).values().forEach((it) -> {
            Field field = sourceMap.get(it.getName().toLowerCase().replace("_", ""));
            if (field != null) {
                it.setAccessible(true);
                field.setAccessible(true);
                try {
                    it.set(target,field.get(source));
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
        });
        return (T) target;
    }

    private static class CacheAsmFiledMethod {
        private static Map> cacheGetMethod = new HashMap<>();
        private static Map> cacheSetMethod = new HashMap<>();

        private static Map getMethod(String type, Class clazz) {
            MethodAccess methodAccess = CacheMethodAccess.getMethodAccess(clazz);
            Map allFields = CacheFieldMap.getFieldMap(clazz);
            Map result = null;
            if (type.equals("get")) {
                result = cacheGetMethod.get(clazz.getName());
            } else if (type.equals("set")) {
                result = cacheSetMethod.get(clazz.getName());
            }
            if (result == null) {
                synchronized (CacheAsmFiledMethod.class) {
                    if (result == null) {
                        Map set = new HashMap<>();
                        Map get = new HashMap<>();
                        allFields.values().forEach((it) -> {
                            //判断是否是静态
                            if (!Modifier.isStatic(it.getModifiers())) {
                                //首字母大写
                                char[] f = it.getName().toCharArray();
                                f[0] -= 32;
                                String fieldName = new String(f);
                                get.put(fieldName.toLowerCase().replace("_", ""), "get" + fieldName);
                                set.put(fieldName.toLowerCase().replace("_", ""), "set" + fieldName);
                            }
                        });
                        cacheGetMethod.put(clazz.getName(), get);
                        cacheSetMethod.put(clazz.getName(), set);
                        if (type.equals("get")) {
                            result = cacheGetMethod.get(clazz.getName());
                        } else if (type.equals("set")) {
                            result = cacheSetMethod.get(clazz.getName());
                        }
                    }
                }
            }
            return result;
        }
    }

    private static class SingleClass {
        private static Map cacheObject = new HashMap<>();

        private SingleClass() {
        }

        private static  T getObject(Class clazz) {
            T result = (T) cacheObject.get(clazz.getName());
            if (result == null) {
                synchronized (SingleClass.class) {
                    if (result == null) {
                        try {
                            cacheObject.put(clazz.getName(), clazz.newInstance());
                            result = (T) cacheObject.get(clazz.getName());
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
            return result;
        }
    }

    private static class CacheMethodAccess {

        private CacheMethodAccess() {
        }

        private static Map cache = new HashMap<>();

        private static MethodAccess getMethodAccess(Class clazz) {
            MethodAccess result = cache.get(clazz.getName());
            if (result == null) {
                synchronized (CacheMethodAccess.class) {
                    if (result == null) {
                        cache.put(clazz.getName(), MethodAccess.get(clazz));
                        result = cache.get(clazz.getName());
                    }
                }
            }
            return result;
        }
    }

    private static class CacheFieldMap {
        private static Map> cacheMap = new HashMap<>();

        private static Map getFieldMap(Class clazz) {
            Map result = cacheMap.get(clazz.getName());
            if (result == null) {
                synchronized (CacheFieldMap.class) {
                    if (result == null) {
                        Map fieldMap = new HashMap<>();
                        for (Field field : clazz.getDeclaredFields()) {
                            fieldMap.put(field.getName().toLowerCase().replace("_", ""), field);
                        }
                        cacheMap.put(clazz.getName(), fieldMap);
                        result = cacheMap.get(clazz.getName());
                    }
                }
            }
            return result;
        }
    }

}