API统一返回对象

泛型类

package com.imooc.mall.common;

import com.imooc.mall.exception.ImoocMallExceptionEnum;

/**
 * 描述：     通用返回对象
 * 泛型类
 */
public class ApiRestResponse<T> {
    /*定义属性*/
    private Integer status;

    private String msg;

    private T data;
    /*定义常量*/
    private static final int OK_CODE = 10000;

    private static final String OK_MSG = "SUCCESS";
    /*构造函数→3参数*/
    public ApiRestResponse(Integer status, String msg, T data) {
        this.status = status;
        this.msg = msg;
        this.data = data;
    }
    /*构造函数→2参数*/
    public ApiRestResponse(Integer status, String msg) {
        this.status = status;
        this.msg = msg;
    }
    /*构造函数→无参，无参构造函数构造的对象默认成功*/
    public ApiRestResponse() {
        this(OK_CODE, OK_MSG);
    }

    public static <T> ApiRestResponse<T> success() {
        return new ApiRestResponse<>();
    }

    public static <T> ApiRestResponse<T> success(T result) {
        ApiRestResponse<T> response = new ApiRestResponse<>();
        response.setData(result);
        return response;
    }

    public static <T> ApiRestResponse<T> error(Integer code, String msg) {
        return new ApiRestResponse<>(code, msg);
    }

    public static <T> ApiRestResponse<T> error(ImoocMallExceptionEnum ex) {
        return new ApiRestResponse<>(ex.getCode(), ex.getMsg());
    }

    @Override
    public String toString() {
        return "ApiRestResponse{" +
                "status=" + status +
                ", msg='" + msg + '\'' +
                ", data=" + data +
                '}';
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public String getMsg() {
        return msg;
    }

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

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public static int getOkCode() {
        return OK_CODE;
    }

    public static String getOkMsg() {
        return OK_MSG;
    }
}

枚举类

package com.imooc.mall.exception;

/**
 * 描述：     异常枚举
 */
public enum ImoocMallExceptionEnum {
    NEED_USER_NAME(10001, "用户名不能为空"),
    NEED_PASSWORD(10002, "密码不能为空"),
    PASSWORD_TOO_SHORT(10003, "密码长度不能小于8位"),
    NAME_EXISTED(10004, "不允许重名"),
    INSERT_FAILED(10005, "插入失败，请重试"),
    WRONG_PASSWORD(10006, "密码错误"),
    NEED_LOGIN(10007, "用户未登录"),
    UPDATE_FAILED(10008, "更新失败"),
    NEED_ADMIN(10009, "无管理员权限"),
    PARA_NOT_NULL(10010, "参数不能为空"),
    CREATE_FAILED(10011, "新增失败"),
    REQUEST_PARAM_ERROR(10012, "参数错误"),
    DELETE_FAILED(10013, "删除失败"),
    MKDIR_FAILED(10014, "文件夹创建失败"),
    UPLOAD_FAILED(10015, "图片上传失败"),
    NOT_SALE(10016, "商品状态不可售"),
    NOT_ENOUGH(10017, "商品库存不足"),
    CART_EMPTY(10018, "购物车已勾选的商品为空"),
    NO_ENUM(10019, "未找到对应的枚举"),
    NO_ORDER(10020, "订单不存在"),
    NOT_YOUR_ORDER(10021, "订单不属于你"),
    WRONG_ORDER_STATUS(10022, "订单状态不符"),
    SYSTEM_ERROR(20000, "系统异常，请从控制台或日志中查看具体错误信息");
    /**
     * 异常码
     */
    Integer code;
    /**
     * 异常信息
     */
    String msg;

    ImoocMallExceptionEnum(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    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;
    }
}