使用Gson解析ndJson多条记录的完整指南

{"id": 1, "name": "Alice"}
{"id": 2, "name": "Bob"}
{"id": 3, "name": "Charlie"}

import com.google.gson.Gson;
import com.google.gson.stream.JsonReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;
import java.util.ArrayList;

// 假设 CustomerFeedDTO 类已定义
class CustomerFeedDTO {
    private Map<String, ?> profile;
    private Map<String, ?> phone;
    private ArrayList<?> addresses;
    private Map<String, ?> orders;
    private ArrayList<?> customs;

    // Getters and setters (省略)
    @Override
    public String toString() {
        return "CustomerFeedDTO{" +
               "profile=" + profile +
               ", phone=" + phone +
               ", addresses=" + addresses +
               ", orders=" + orders +
               ", customs=" + customs +
               '}';
    }
}

public class NdJsonParserProblem {
    public static void main(String[] args) {
        Gson gson = new Gson();
        try (JsonReader reader = new JsonReader(new FileReader("customer.json"))) {
            // 这种方式只会读取第一个JSON对象
            CustomerFeedDTO customerFeedDTO = gson.fromJson(reader, CustomerFeedDTO.class);
            System.out.println("只读取到第一条记录: " + customerFeedDTO);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import com.google.gson.Gson;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonToken;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

// 假设 CustomerFeedDTO 类已定义，与上面示例相同
class CustomerFeedDTO {
    private Map<String, ?> profile;
    private Map<String, ?> phone;
    private ArrayList<?> addresses;
    private Map<String, ?> orders;
    private ArrayList<?> customs;

    // Getters and setters
    public Map<String, ?> getProfile() { return profile; }
    public void setProfile(Map<String, ?> profile) { this.profile = profile; }
    // ... 其他getter/setter
    @Override
    public String toString() {
        return "CustomerFeedDTO{" +
               "profile=" + profile +
               ", phone=" + phone +
               ", addresses=" + addresses +
               ", orders=" + orders +
               ", customs=" + customs +
               '}';
    }
}

public class NdJsonParserSolution {
    public static void main(String[] args) {
        List<CustomerFeedDTO> customerFeedDTOs = new ArrayList<>();
        Gson gson = new Gson();

        // 使用try-with-resources确保JsonReader正确关闭
        try (JsonReader reader = new JsonReader(new FileReader("customer.json"))) {
            // 启用宽松模式，以更好地处理ndJson格式，例如允许根级别的值之间没有分隔符
            reader.setLenient(true);

            // 循环读取，直到文件末尾
            // reader.peek() != JsonToken.END_DOCUMENT 是判断文件是否结束的关键
            while (reader.peek() != JsonToken.END_DOCUMENT) {
                // 将当前JSON对象映射到CustomerFeedDTO
                CustomerFeedDTO customerFeedDTO = gson.fromJson(reader, CustomerFeedDTO.class);
                customerFeedDTOs.add(customerFeedDTO);
            }

            // 打印所有解析出的记录
            System.out.println("成功解析所有记录:");
            for (int i = 0; i < customerFeedDTOs.size(); i++) {
                System.out.println("记录 #" + (i + 1) + ": " + customerFeedDTOs.get(i));
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

import java.util.ArrayList;
import java.util.Map;

public class CustomerFeedDTO {
    // 使用Map来处理结构可能不完全固定的JSON对象
    private Map<String, ?> profile;
    private Map<String, ?> phone;
    // 使用ArrayList来处理JSON数组
    private ArrayList<?> addresses;
    private Map<String, ?> orders;
    private ArrayList<?> customs;

    // 构造函数 (可选)
    public CustomerFeedDTO() {}

    // Getters and Setters
    public Map<String, ?> getProfile() {
        return profile;
    }

    public void setProfile(Map<String, ?> profile) {
        this.profile = profile;
    }

    public Map<String, ?> getPhone() {
        return phone;
    }

    public void setPhone(Map<String, ?> phone) {
        this.phone = phone;
    }

    public ArrayList<?> getAddresses() {
        return addresses;
    }

    public void setAddresses(ArrayList<?> addresses) {
        this.addresses = addresses;
    }

    public Map<String, ?> getOrders() {
        return orders;
    }

    public void setOrders(Map<String, ?> orders) {
        this.orders = orders;
    }

    public ArrayList<?> getCustoms() {
        return customs;
    }

    public void setCustoms(ArrayList<?> customs) {
        this.customs = customs;
    }

    @Override
    public String toString() {
        return "CustomerFeedDTO{" +
               "profile=" + profile +
               ", phone=" + phone +
               ", addresses=" + addresses +
               ", orders=" + orders +
               ", customs=" + customs +
               '}';
    }
}