JsonUtil.java

package vion.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.dromara.hutool.core.array.ArrayUtil;
import org.dromara.hutool.core.text.StrUtil;

import java.io.IOException;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/**
 * JSON 工具类
 *
 * @author ShuQian_Liu
 */
@Slf4j
public class JsonUtil {

    private static ObjectMapper objectMapper = new ObjectMapper();

    static {
        objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 忽略 null 值
        // objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        // 解决 LocalDateTime 的序列化
        objectMapper.registerModules(new JavaTimeModule());
    }

    /**
     * 初始化 objectMapper 属性
     * <p>
     * 通过这样的方式，使用 Spring 创建的 ObjectMapper Bean
     *
     * @param objectMapper ObjectMapper 对象
     */
    public static void init(ObjectMapper objectMapper) {
        JsonUtil.objectMapper = objectMapper;
    }

    public static ObjectNode createObj() {
        return objectMapper.createObjectNode();
    }

    public static ArrayNode createArr() {
        return objectMapper.createArrayNode();
    }

    @SneakyThrows
    public static String toJsonString(Object object) {
        return objectMapper.writeValueAsString(object);
    }

    @SneakyThrows
    public static byte[] toJsonByte(Object object) {
        return objectMapper.writeValueAsBytes(object);
    }

    @SneakyThrows
    public static String toJsonPrettyString(Object object) {
        return objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(object);
    }

    public static <T> T parseObject(String text, Class<T> clazz) {
        if (StrUtil.isEmpty(text)) {
            return null;
        }
        try {
            return objectMapper.readValue(text, clazz);
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static <T> T parseObject(String text, String path, Class<T> clazz) {
        if (StrUtil.isEmpty(text)) {
            return null;
        }
        try {
            JsonNode treeNode = objectMapper.readTree(text);
            JsonNode pathNode = treeNode.path(path);
            return objectMapper.readValue(pathNode.toString(), clazz);
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static <T> T parseObject(String text, Type type) {
        if (StrUtil.isEmpty(text)) {
            return null;
        }
        try {
            return objectMapper.readValue(text, objectMapper.getTypeFactory().constructType(type));
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    /**
     * 将字符串解析成指定类型的对象
     * 使用 {@link #parseObject(String, Class)} 时，在@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS) 的场景下，
     * 如果 text 没有 class 属性，则会报错。此时，使用这个方法，可以解决。
     *
     * @param text  字符串
     * @param clazz 类型
     * @return 对象
     */
    public static <T> T parseObject2(String text, Class<T> clazz) {
        if (StrUtil.isEmpty(text)) {
            return null;
        }
        try {
            return objectMapper.readValue(text, clazz);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
    }

    public static <T> T parseObject(byte[] bytes, Class<T> clazz) {
        if (ArrayUtil.isEmpty(bytes)) {
            return null;
        }
        try {
            return objectMapper.readValue(bytes, clazz);
        } catch (IOException e) {
            log.error("json parse err,json:{}", bytes, e);
            throw new RuntimeException(e);
        }
    }

    public static <T> T parseObject(String text, TypeReference<T> typeReference) {
        try {
            return objectMapper.readValue(text, typeReference);
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    /**
     * 解析 JSON 字符串成指定类型的对象，如果解析失败，则返回 null
     *
     * @param text          字符串
     * @param typeReference 类型引用
     * @return 指定类型的对象
     */
    public static <T> T parseObjectQuietly(String text, TypeReference<T> typeReference) {
        try {
            return objectMapper.readValue(text, typeReference);
        } catch (IOException e) {
            return null;
        }
    }

    public static <T> List<T> parseArray(String text, Class<T> clazz) {
        if (StrUtil.isEmpty(text)) {
            return new ArrayList<>();
        }
        try {
            return objectMapper.readValue(text, objectMapper.getTypeFactory().constructCollectionType(List.class, clazz));
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static <T> List<T> parseArray(String text, String path, Class<T> clazz) {
        if (StrUtil.isEmpty(text)) {
            return null;
        }
        try {
            JsonNode treeNode = objectMapper.readTree(text);
            JsonNode pathNode = treeNode.path(path);
            return objectMapper.readValue(pathNode.toString(), objectMapper.getTypeFactory().constructCollectionType(List.class, clazz));
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static JsonNode parseTree(String text) {
        try {
            return objectMapper.readTree(text);
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static JsonNode parseTree(byte[] text) {
        try {
            return objectMapper.readTree(text);
        } catch (IOException e) {
            log.error("json parse err,json:{}", text, e);
            throw new RuntimeException(e);
        }
    }

    public static boolean isJson(String jsonString) {
        try {
            objectMapper.readTree(jsonString);
            return true;
        } catch (Exception e) {
            return false;
        }
    }

}