Java中，list<实体类>转String

你可以使用Jackson库将List<实体类>转换为JSON字符串，示例代码如下：

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.List;

public class Main {
    public static void main(String[] args) throws JsonProcessingException {
        List<Entity> entityList = List.of(
                new Entity("A", 1),
                new Entity("B", 2),
                new Entity("C", 3)
        );
        ObjectMapper objectMapper = new ObjectMapper();
        String jsonString = objectMapper.writeValueAsString(entityList);
        System.out.println(jsonString);
    }

    private static class Entity {
        private String name;
        private int value;

        public Entity(String name, int value) {
            this.name = name;
            this.value = value;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getValue() {
            return value;
        }

        public void setValue(int value) {
            this.value = value;
        }
    }
}

输出结果为：

[{"name":"A","value":1},{"name":"B","value":2},{"name":"C","value":3}]