模拟生成20个卡点车流量和行驶速度java 将它的数据封装成Monitor对象 将数据序列化成JSON对象

在Java中，我们可以将上述生成的`TrafficPoint`数据封装成`Monitor`对象，并将其序列化为JSON。首先，我们需要添加一个`Monitor`类，包含`TrafficPoint`数组：

import com.fasterxml.jackson.annotation.JsonProperty;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Monitor implements Serializable {
    private List<TrafficPoint> trafficPoints;

    public Monitor(List<TrafficPoint> trafficPoints) {
        this.trafficPoints = trafficPoints;
    }

    @JsonProperty("card_points")
    public List<TrafficPoint> getTrafficPoints() {
        return trafficPoints;
    }

    // 添加序列化反序列化的get和set方法
    @Override
    public String toString() {
        return "Monitor{" +
                "trafficPoints=" + trafficPoints +
                '}';
    }

    // 可选的将Monitor转换为JSON字符串
    public String toJson() {
        try {
            return new ObjectMapper().writeValueAsString(this);
        } catch (JsonProcessingException e) {
            throw new RuntimeException("Failed to convert Monitor to JSON", e);
        }
    }
}

// 更新TrafficPoint类，加入equals和hashCode方法以便于序列化
class TrafficPoint implements Serializable {
    // ...其他属性...

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null || getClass() != obj.getClass()) return false;
        TrafficPoint trafficPoint = (TrafficPoint) obj;
        return index == trafficPoint.index &&
                flow == trafficPoint.flow &&
                Double.compare(velocity, trafficPoint.velocity) == 0;
    }

    @Override
    public int hashCode() {
        return Objects.hash(index, flow, velocity);
    }
}

现在，你可以使用Jackson库将`Monitor`实例转换为JSON字符串：

Monitor monitor = new Monitor(points); // points是之前生成的TrafficPoint列表
String json = monitor.toJson();
System.out.println(json);