表现层数据封装

设置统一数据返回结果类

注意：Result类中的字段并不是固定的，可以根据需要自行增减提供若干个构造方法，方便操作

返回结果类

package com.cqupt.controller;

public class Result {
    private Object data;
    private Integer code;
    private String msg;

    public Result() {
    }

    public Result(Integer code, Object data, String msg) {
        this.data = data;
        this.code = code;
        this.msg = msg;
    }

    public Result(Integer code, Object data) {
        this.data = data;
        this.code = code;
    }

    public Object getData() {
        return data;
    }

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

    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;
    }
}

统一设置返回结果编码

package com.cqupt.controller;

public class Code {
    public static final Integer SAVE_OK = 20011;
    public static final Integer DELETE_OK = 20021;
    public static final Integer UPDATE_OK = 20031;
    public static final Integer SELECT_OK = 20041;

    public static final Integer SAVE_ERR = 20010;
    public static final Integer DELETE_ERR = 20020;
    public static final Integer UPDATE_ERR = 20030;
    public static final Integer SELECT_ERR = 20040;
}

 Code类的常量设计也不是固定的，可以根据需要自行增减，例如将查询再进行细分为GET_OK，GET_ALL_OK，GET_PAGE_OK