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package com.yj.earth.common.service;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.fasterxml.jackson.databind.SerializationFeature;
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import org.springframework.stereotype.Component;
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import javax.annotation.Resource;
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import java.lang.reflect.*;
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import java.util.*;
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@Component
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public class SourceDataGenerator {
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@Resource
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private SourceParamsValidator sourceParamsValidator;
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private static final ObjectMapper objectMapper;
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static {
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// 初始化ObjectMapper并配置
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objectMapper = new ObjectMapper();
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// 允许序列化空对象
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objectMapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
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// 格式化输出
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objectMapper.enable(SerializationFeature.INDENT_OUTPUT);
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}
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/**
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* 生成包含完整层级结构的默认JSON
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*/
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public String generateDefaultJson(String sourceType) throws JsonProcessingException {
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// 获取目标类
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Class<?> targetClass = sourceParamsValidator.getSourceTypeMap().get(sourceType);
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if (targetClass == null) {
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throw new IllegalArgumentException("不支持的资源类型: " + sourceType);
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}
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return generateJsonStructure(targetClass);
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}
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/**
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* 根据类生成JSON结构字符串
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* @param clazz 目标类
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* @return 完整结构的JSON字符串
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*/
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public static String generateJsonStructure(Class<?> clazz) throws JsonProcessingException {
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Object instance = initializeObject(clazz);
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return objectMapper.writeValueAsString(instance);
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}
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/**
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* 递归初始化对象（包括嵌套类、集合、数组）
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*/
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private static Object initializeObject(Class<?> clazz) {
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try {
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// 处理数组类型
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if (clazz.isArray()) {
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return initializeArray(clazz);
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}
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// 处理基本类型包装类或字符串（直接返回默认值）
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if (isPrimitiveOrWrapper(clazz) || clazz.equals(String.class)) {
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return getDefaultValue(clazz);
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}
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// 处理集合接口（直接实例化为ArrayList/HashSet等）
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if (clazz.isInterface()) {
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if (List.class.isAssignableFrom(clazz)) {
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clazz = ArrayList.class;
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} else if (Set.class.isAssignableFrom(clazz)) {
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clazz = HashSet.class;
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} else if (Map.class.isAssignableFrom(clazz)) {
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clazz = HashMap.class;
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} else {
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// 其他接口默认返回null（避免无法实例化）
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return null;
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}
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}
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// 创建类实例（支持static内部类）
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Constructor<?> constructor = clazz.getDeclaredConstructor();
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constructor.setAccessible(true); // 允许访问私有构造函数
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Object instance = constructor.newInstance();
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// 初始化所有字段
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for (Field field : clazz.getDeclaredFields()) {
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field.setAccessible(true);
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Class<?> fieldType = field.getType();
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// 跳过静态字段（通常不需要序列化静态成员）
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if (Modifier.isStatic(field.getModifiers())) {
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continue;
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}
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// 基本类型、包装类、字符串：直接设默认值
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if (isPrimitiveOrWrapper(fieldType) || fieldType.equals(String.class)) {
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field.set(instance, getDefaultValue(fieldType));
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continue;
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}
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// 处理数组
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if (fieldType.isArray()) {
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field.set(instance, initializeArray(fieldType));
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continue;
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}
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// 处理集合
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if (Collection.class.isAssignableFrom(fieldType)) {
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field.set(instance, initializeCollection(field));
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continue;
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}
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// 处理Map
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if (Map.class.isAssignableFrom(fieldType)) {
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field.set(instance, initializeMap(field));
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continue;
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}
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// 处理嵌套对象（包括static内部类）
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field.set(instance, initializeObject(fieldType));
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}
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return instance;
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} catch (Exception e) {
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throw new RuntimeException("初始化对象失败: " + clazz.getName(), e);
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}
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}
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/**
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* 初始化数组
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*/
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private static Object initializeArray(Class<?> arrayType) {
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Class<?> componentType = arrayType.getComponentType();
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// 创建长度为1的数组
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Object array = Array.newInstance(componentType, 1);
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// 初始化数组元素（字符串类型会返回空字符串）
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try {
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Object element = initializeObject(componentType);
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Array.set(array, 0, element);
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} catch (Exception e) {
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// 初始化失败时设置为对应类型的默认值（字符串为""）
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Array.set(array, 0, getDefaultValue(componentType));
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}
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return array;
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}
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/**
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* 初始化集合
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*/
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private static Collection<?> initializeCollection(Field field) {
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Class<?> fieldType = field.getType();
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Type genericType = field.getGenericType();
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Collection<Object> collection;
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// 创建具体集合实例
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try {
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if (fieldType.isInterface()) {
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collection = new ArrayList<>();
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} else {
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collection = (Collection<Object>) fieldType.getDeclaredConstructor().newInstance();
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}
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} catch (Exception e) {
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collection = new ArrayList<>();
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}
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// 处理泛型元素（字符串类型会添加空字符串）
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if (genericType instanceof ParameterizedType) {
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Type[] actualTypeArguments = ((ParameterizedType) genericType).getActualTypeArguments();
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if (actualTypeArguments.length > 0 && actualTypeArguments[0] instanceof Class) {
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Class<?> elementType = (Class<?>) actualTypeArguments[0];
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try {
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Object element = initializeObject(elementType);
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collection.add(element);
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} catch (Exception e) {
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// 元素初始化失败时添加默认值（字符串为""）
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collection.add(getDefaultValue(elementType));
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}
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}
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}
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return collection;
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}
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/**
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* 初始化Map
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*/
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private static Map<?, ?> initializeMap(Field field) {
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Class<?> fieldType = field.getType();
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Type genericType = field.getGenericType();
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Map<Object, Object> map;
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// 创建具体Map实例
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try {
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if (fieldType.isInterface()) {
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map = new HashMap<>();
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} else {
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map = (Map<Object, Object>) fieldType.getDeclaredConstructor().newInstance();
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}
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} catch (Exception e) {
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map = new HashMap<>();
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}
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// 处理泛型键值对（value为字符串时设为空字符串）
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if (genericType instanceof ParameterizedType) {
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Type[] actualTypeArguments = ((ParameterizedType) genericType).getActualTypeArguments();
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if (actualTypeArguments.length == 2) {
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try {
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// key默认用字符串"key"，value按泛型类型设默认值（字符串为""）
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Object key = "key";
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Object value = actualTypeArguments[1] instanceof Class
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? initializeObject((Class<?>) actualTypeArguments[1])
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: getDefaultValue(String.class); // 非Class类型默认空字符串
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map.put(key, value);
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} catch (Exception e) {
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// 初始化失败时value设为对应类型默认值（字符串为""）
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map.put("key", getDefaultValue(actualTypeArguments[1] instanceof Class ? (Class<?>) actualTypeArguments[1] : String.class));
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}
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}
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}
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return map;
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}
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/**
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* 判断是否为基本类型或包装类
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*/
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private static boolean isPrimitiveOrWrapper(Class<?> type) {
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return type.isPrimitive()
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|| type.equals(Boolean.class)
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|| type.equals(Byte.class)
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|| type.equals(Short.class)
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|| type.equals(Integer.class)
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|| type.equals(Long.class)
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|| type.equals(Float.class)
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|| type.equals(Double.class)
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|| type.equals(Character.class);
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}
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/**
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* 获取类型默认值：字符串返回空字符串，其他类型按原有逻辑
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*/
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private static Object getDefaultValue(Class<?> type) {
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if (type.equals(String.class)) {
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return "";
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}
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// 原有逻辑：基本类型返回对应默认值（boolean=false/数值=0/char='\0'）
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if (type.isPrimitive()) {
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if (type == boolean.class) return false;
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if (type == char.class) return '\0';
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return 0; // 所有数值类型（byte/short/int/long/float/double）默认0
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}
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// 包装类（如Integer/Boolean）默认返回null（保持原有逻辑）
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return null;
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}
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}
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