SpringBoot实战项目（二）--项目目录结构及定义公共基础类

项目结构

 分页

package com.beilin.result;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;

import java.io.Serializable;

/**
 * 分页查询参数
 */
@Slf4j
@Data
public class Page implements Serializable {

    private static final long serialVersionUID = 7328071045193618467L;
    private Integer page;//当前页
    private Integer limit;//每页显示多少条
    private Integer offset;//数据库偏移量

    public void countOffset() {
        if (null == this.page || null == this.limit) {
            this.offset = 0;
            return;
        }
        this.offset = (this.page - 1) * this.limit;
    }


    @Override
    public String toString() {
        return "PageTableRequest{" +
                "page=" + page +
                ", limit=" + limit +
                ", offset=" + offset +
                '}';
    }
}

Json统一结果返回类 跟 公共请求信息

package com.beilin.result;

import lombok.Data;

import java.io.Serializable;
import java.util.List;

@Data
public class Results<T>  implements Serializable {

    int count;//数据数量
    Integer code;//代码
    String msg;//信息
    List<T> datas;//返回数据
    T data;//任何类型条件

    public Results() {
    }
    public Results(Integer code, String msg) {
        super();
        this.code = code;
        this.msg = msg;
    }


    public Results(Integer code, String msg, T data, Integer count, List<T> datas) {
        this.code = code;
        this.msg = msg;
        this.data = data;
        this.count = count;
        this.datas = datas;
    }


    /* 无数据传输的 成功返回 */
    public static <T> Results<T> success() {
        return new Results<T>( ResponseCode.SUCCESS.getCode(),  ResponseCode.SUCCESS.getMessage());
    }

    public static <T> Results<T> success(String msg) {
        return new Results<T>(ResponseCode.SUCCESS.getCode(), msg);
    }

    public static <T> Results<T> success(ResponseCode resultCode) {
        return new Results<T>( resultCode.getCode(),  resultCode.getMessage());
    }

    /* 单个数据传输的 成功返回 */
    public static <T> Results<T> success(T data) {
        return new Results<T>( ResponseCode.SUCCESS.getCode(),  ResponseCode.SUCCESS.getMessage(), data, 0, null);
    }
     public static <T> Results<T> success( List<T> datas) {
        return new Results<T>(ResponseCode.TABLE_SUCCESS.getCode(),ResponseCode.SUCCESS.getMessage(),null,0,datas);
    }

    public static <T> Results<T> success(String msg, T data) {
        return new Results<T>(ResponseCode.SUCCESS.getCode(), msg, data, 0, null);
    }

    public static <T> Results<T> success(ResponseCode resultCode, T data) {
        return new Results<T>( resultCode.getCode(),  resultCode.getMessage(), data, 0, null);
    }

    /* 分页数据传输的 成功返回 */
    public static <T> Results<T> success(Integer count, List<T> datas) {
        return new Results<T>(ResponseCode.TABLE_SUCCESS.getCode(),ResponseCode.SUCCESS.getMessage(),null,count, datas);
    }

    public static <T> Results<T> success(String msg, Integer count, List<T> datas) {
        return new Results<T>(ResponseCode.TABLE_SUCCESS.getCode(), msg, null, count, datas);
    }

    public static <T> Results<T> success(ResponseCode resultCode, Integer count, List<T> datas) {
        return new Results<T>( resultCode.getCode(),  resultCode.getMessage(), null, count, datas);
    }
    /* 无数据传输的 失败返回 */
    public static <T> Results<T> failure() {
        return new Results<T>( ResponseCode.FAIL.getCode(), ResponseCode.FAIL.getMessage());
    }

    public static <T> Results<T> failure(ResponseCode resultCode) {
        return new Results<T>( resultCode.getCode(),  resultCode.getMessage());
    }

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

    public static Results ok() {
        return new Results();
    }

}

package com.beilin.result;

public enum  ResponseCode {

    // 公共请求信息
    SUCCESS(200, "请求成功"),
    TABLE_SUCCESS(0, "请求成功"),
    FAIL(500, "请求失败，请联系实训邦小姐姐"),
    PARAMETER_MISSING(600,"参数缺失"),
    UNAUTHORIZED(401,"未授权"),
    // ..一真往后面加

    //用户信息
    //5000100 - 5000200
    USERNAME_REPEAT(5000100,"用户名已存在"),
    PHONE_REPEAT(5000101,"手机号已存在"),
    EMAIL_REPEAT(5000102,"邮箱已存在"),
    //用户-角色
    //5000201 - 5000300
    USER_ROLE_NO_CLEAR(5000201,"该角色存在用户关联，无法删除")

;
    private Integer code;
    
    private String message;
    
    ResponseCode(Integer code, String message) {
        this.code = code;
        this.message = message;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public static String getMessage(String name) {
        for (ResponseCode item : ResponseCode.values()) {
            if (item.name().equals(name)) {
                return item.message;
            }
        }
        return null;
    }

    public static Integer getCode(String name) {
        for (ResponseCode item : ResponseCode.values()) {
            if (item.name().equals(name)) {
                return item.code;
            }
        }
        return null;
    }
}

定义页面跳转共用控制器

package com.beilin.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("${api-url}")
public class ApiController {

    @RequestMapping("/getPage")
    public ModelAndView getPage(ModelAndView model,String pageName){
        model.setViewName(pageName);
        return model;
    }

}