springbot项目中使用继承

package com.example.demo.controller;

import com.sun.org.apache.bcel.internal.generic.NEW;
import org.springframework.web.bind.annotation.*;

/**
 * @program: demo->DemoController
 * @description: demo
 * @author: cxy
 * @create: 2019-11-13 16:47
 **/
@RestController
public class DemoController {

    @RequestMapping(value = "/", method = RequestMethod.POST)
    public RspResult detail(@RequestBody TraceReqCancelOrder traceReqCancelOrder) {
        TraceRspResult rsp = new TraceRspResult();
        String traceId = traceReqCancelOrder.getTraceId();
        System.out.println(traceId);

        System.out.println(traceReqCancelOrder.toString());
        check(traceReqCancelOrder);

        rsp.setTraceId("11111111111111111");
        rsp.setBody(1);
        rsp.setMsg("success");
        rsp.setResult(1);
        return rsp;
        }

        public static void check(ReqCancelOrder order){
            String traceId = order.getTeacherId();
            System.out.println(traceId);
        }

    @RequestMapping(value = "/2", method = RequestMethod.POST)
    public RspResult detail1(@PathVariable Integer id) {
        TraceRspResult rsp = new TraceRspResult();
        System.out.println(id);

        rsp.setTraceId("11111111111111111");
        rsp.setBody(1);
        rsp.setMsg("success");
        rsp.setResult(1);
        return rsp;
    }

    @RequestMapping(value = "/3", method = RequestMethod.POST)
    public RspResult detail2(@PathVariable Integer id) {
        RspResult rsp = new TraceRspResult();
        System.out.println(id);

        rsp.setTraceId("11111111111111111");
        rsp.setBody(1);
        rsp.setMsg("success");
        rsp.setResult(1);
        return rsp;
    }



}

package com.example.demo.controller;

import com.fasterxml.jackson.annotation.JsonProperty;

public class ReqCancelOrder {

    
    @JsonProperty("SerialNo")
    private String serialNo;
    
    @JsonProperty("TeacherId")
    private String teacherId;
    
    @JsonProperty("TeamId")
    private String teamId;
    
    @JsonProperty("LocalOrderNo")
    private long localOrderNo;

    public String getSerialNo() {
        return serialNo;
    }

    public void setSerialNo(String serialNo) {
        this.serialNo = serialNo;
    }

    public String getTeacherId() {
        return teacherId;
    }

    public void setTeacherId(String teacherId) {
        this.teacherId = teacherId;
    }

    public String getTeamId() {
        return teamId;
    }

    public void setTeamId(String teamId) {
        this.teamId = teamId;
    }

    public long getLocalOrderNo() {
        return localOrderNo;
    }

    public void setLocalOrderNo(long localOrderNo) {
        this.localOrderNo = localOrderNo;
    }

    @Override
    public String toString() {
        return "ReqCancelOrder{" +
                "serialNo='" + serialNo + '\'' +
                ", teacherId='" + teacherId + '\'' +
                ", teamId='" + teamId + '\'' +
                ", localOrderNo=" + localOrderNo +
                '}';
    }
}

package com.example.demo.controller;

import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.List;

public class ReqOrderStatusQuery {

    // 序列号
    @JsonProperty("SerialNo")
    private String serialNo;
    // 订单请求列表
    @JsonProperty("Orders")
    private List<Order> orders ;

    public List<Order> getOrders() {
        return orders;
    }

    public void setOrders(List<Order> orders) {
        this.orders = orders;
    }

    public static class  Order {

        // 老师ID
        @JsonProperty("TeacherId")
        private String teacherId;
        // 委托单号
        @JsonProperty("LocalOrderNo")
        private long localOrderNo;


        public String getTeacherId() {
            return teacherId;
        }

        public void setTeacherId(String teacherId) {
            this.teacherId = teacherId;
        }

        public long getLocalOrderNo() {
            return localOrderNo;
        }

        public void setLocalOrderNo(long localOrderNo) {
            this.localOrderNo = localOrderNo;
        }

        @Override
        public String toString() {
            return "Order{" +
                    "teacherId='" + teacherId + '\'' +
                    ", localOrderNo=" + localOrderNo +
                    '}';
        }
    }

    @Override
    public String toString() {
        return "ReqOrderStatusQuery{" +
                "serialNo='" + serialNo + '\'' +
                ", orders=" + orders +
                '}';
    }
}

package com.example.demo.controller;

import com.fasterxml.jackson.annotation.JsonProperty;

public class RspResult {

    public static final String SUCCESS_MSG = "success";
    public static final String FAIL_MSG = "fail";

    @JsonProperty("Result")
    private int result;
    @JsonProperty("Msg")
    private String msg;
    @JsonProperty("Body")
    private Object body;

    public static RspResult genSucess(Object object) {
        RspResult rspResult = new RspResult();
        rspResult.setResult(1);
        rspResult.setMsg(SUCCESS_MSG);
        rspResult.setBody(object);
        return rspResult;
    }

    public static RspResult genFail(String msg) {
        RspResult rspResult = new RspResult();
        rspResult.setResult(-1);
        rspResult.setMsg(msg);
        rspResult.setBody(null);
        return rspResult;
    }

    public int getResult() {
        return result;
    }

    public void setResult(int result) {
        this.result = result;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getBody() {
        return body;
    }

    public void setBody(Object body) {
        this.body = body;
    }
}

package com.example.demo.controller;

import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * @program: tdsimulate->TraceReqCancelOrder
 * @description: 接入监控平台的取消委托参数
 * @author: cxy
 * @create: 2019-11-13 16:24
 **/
public class TraceReqCancelOrder extends  ReqCancelOrder{
    //traceId  链路追踪id
    @JsonProperty("TraceId")
    private String traceId;

    public String getTraceId() {
        return traceId;
    }

    public void setTraceId(String traceId) {
        this.traceId = traceId;
    }

    @Override
    public String toString() {
        return "TraceReqCancelOrder{" +
                "traceId='" + traceId + '\'' +
                "} " + super.toString();
    }
}

package com.example.demo.controller;

import com.fasterxml.jackson.annotation.JsonProperty;

/**
 * @program: tdsimulate->TraceRspResult
 * @description: 接入业务系统接入监控平台的返回Dto
 * @author: cxy
 * @create: 2019-11-13 10:53
 **/
public class TraceRspResult extends RspResult {
    //traceId ---首节点生成的traceid
    @JsonProperty("TraceId")
    private String traceId;


    public String getTraceId() {
        return traceId;
    }

    public void setTraceId(String traceId) {
        this.traceId = traceId;
    }



}

可以看主题：今天是继承，所以那么就要采用继承：

这个地方很明显看出问题，就是创建对象时候用子父类去接受子类，是可以的，但是在后面如果去操作子类，是不可以的，编译器直接报错，，如果不操作子类属性是可以的，

那么得出结论：就是父类可以接收子类，但是接受的父类，不可以操作子类的属性

同理：

 如果是父类接受，那么也可以进行，但是只要不操作，子类的属性，