🤷‍♀️Result 定义统一返回结果类

参考：Spring Boot的通用返回类Result
Spring Boot的通用返回类Result_StillTogether的博客-CSDN博客

在上一篇文章中，我们会发现Controller中函数的返回值类型是一个Result

一般来说，后台返回给前端的数据格式都是固定的，比如如下

{
    "code": 5000,
    "data": [
        {
            "id": 8,
            "name": "zyl",
            "number": "2020112617",
            "createdAt": "2021-10-19T12:32:08.497Z",
            "updatedAt": "2021-10-20T02:57:34.580329Z",
            "deletedAt": null
        },
        {
            "id": 9,
            "name": "喻鑫瑞",
            "number": "123456789",
            "createdAt": "2021-10-19T14:02:32.875243Z",
            "updatedAt": "2021-10-19T14:02:32.875243Z",
            "deletedAt": null
        },
        {
            "id": 10,
            "name": "喻鑫瑞2",
            "number": "123456789",
            "createdAt": "2021-10-19T14:06:18.663413Z",
            "updatedAt": "2021-10-19T14:06:18.663413Z",
            "deletedAt": null
        },
        {
            "id": 11,
            "name": "fahfahi",
            "number": "215367164716",
            "createdAt": "2021-10-20T02:31:34.55309Z",
            "updatedAt": "2021-10-20T02:31:34.55309Z",
            "deletedAt": null
        },
        {
            "id": 12,
            "name": "fafa",
            "number": "215367164716",
            "createdAt": "2021-10-20T02:31:42.429517Z",
            "updatedAt": "2021-10-20T02:31:42.429517Z",
            "deletedAt": null
        }
    ],
    "msg": "success",
    "status": "ok"
}

{
    "code": 5000,
    "data": {
        "id": 8,
        "name": "zyl",
        "number": "2020112617",
        "createdAt": "2021-10-19T12:32:08.497Z",
        "updatedAt": "2021-10-20T02:57:34.580329Z",
        "deletedAt": null
    },
    "msg": "success",
    "status": "ok"
}

那么，如何在Java中实现这样的功能呢？
只需要定义一个泛型的Result类即可
比如我们需要如下的返回结果

{
    "code": 5000,
    "msg": "success",
    "status": "ok",
    "data": [
        {
            "name": "zyl3",
            "number": "123456"
        },
        {
            "name": "zyl4",
            "number": "123456"
        },
        {
            "name": "yxr",
            "number": "2020112617"
        }
    ]
}

那么对应的字段即是：

对应的代码实现：

package com.example.demo2.springbootmybatis.utils;
public class Result<T> {
    private Integer code;
    private String msg;
    private String status;
    private T data;
    public Result(Integer code, String msg, String status, T data) {
        this.code = code;
        this.msg = msg;
        this.status = status;
        this.data = data;
    }
    public Result(Integer code, String msg, String status) {
        this.code = code;
        this.msg = msg;
        this.status = status;
    }
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    }
    public T getData() {
        return data;
    }
    public void setData(T data) {
        this.data = data;
    }
    @Override
    public String toString() {
        return "Result{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", status='" + status + '\'' +
                ", data=" + data +
                '}';
    }
}

那么我们在Controller中的函数返回值类型就可以使用我们的Result类
比如这样：

    /**
     * 查询所有
     * */
    @GetMapping("/all")
    public Result<List<Test>> getAll(){
        List<Test> list = testService.getAll();
        return new Result<>(5000,"success","ok",list); //返回一个Result对象，Java会自动转换成JSON对象
    }

如下图所示：