java轮播图接口实现

一. 内容简介

实现java后端用户管理接口，数据库使用msyql。

二. 软件环境

2.1 java 1.8

2.2 mysql Ver 8.0.13 for Win64 on x86_64 (MySQL Community Server - GPL)

2.3 IDEA ULTIMATE 2019.3

2.4d代码地址

https://gitee.com/JJW_1601897441/competitionAssistant.git

三.主要流程

3.1 创建数据库,创建数据表

3.2 开始编写接口，并测试

四.具体步骤

4.1 创建数据库,创建数据表，添加数据

数据表创建
在这里插入图片描述

DROP TABLE IF EXISTS `index_img`;
CREATE TABLE `index_img`  (
  `img_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '主键',
  `img_url` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '图片 图片地址',
  `prod_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '竞赛id',
  `seq` int(11) NOT NULL COMMENT '轮播图展示顺序 轮播图展示顺序，从小到大',
  `status` int(11) NOT NULL COMMENT '是否展示:1表示正常显示，0表示下线 是否展示，1：展示    0：不展示',
  `create_time` datetime(0) NOT NULL COMMENT '创建时间 创建时间',
  `update_time` datetime(0) NOT NULL COMMENT '更新时间 更新',
  PRIMARY KEY (`img_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '轮播图 ' ROW_FORMAT = Compact;

数据用假数据，也可以去另外一个博客下载我的数据，然后存入数据库中。

4.2 开始编写接口,测试

逆向工程生成实体类，
然后编写服务代码，IndexImgServiceImpl

package com.ca.service.impl;

import com.ca.dao.IndexImgMapper;

import com.ca.entity.IndexImg;
import com.ca.entity.Users;
import com.ca.service.IndexImgService;
import com.ca.vo.ResultVO;
import org.apache.ibatis.session.RowBounds;
import org.springframework.stereotype.Service;
import tk.mybatis.mapper.entity.Example;

import javax.annotation.Resource;
import java.util.List;

@Service
public class IndexImgServiceImpl implements IndexImgService {

    @Resource
    private IndexImgMapper indexImgMapper;
    @Override
    public ResultVO listIndexImgs(int length) {

        Example example = new Example(IndexImg.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andEqualTo("status",1);
        RowBounds rowBounds = new RowBounds(0, length); // 从第0条开始，返回10条数据
        List<IndexImg> indexImg = indexImgMapper.selectByExampleAndRowBounds(example, rowBounds);
        return new ResultVO(10000,"查询成功",indexImg);
    }
}

api编写,IndexController

package com.ca.controller;

import com.ca.service.IndexImgService;
import com.ca.service.UserService;
import com.ca.vo.ResultVO;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiImplicitParam;
import io.swagger.annotations.ApiImplicitParams;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping("/index")
// value是详细说明，tags是标签
@Api(value = "提供用首页数据",tags = "首页数据")
// 允许跨域
@CrossOrigin
public class IndexController {

    @Resource
    private IndexImgService imgService;

    @ApiOperation("首页轮播图数据")
    @ApiImplicitParams({
            @ApiImplicitParam(dataType = "int",name = "len", value =
                    "轮播图长度",required = true),

    })
    @RequestMapping(value = "/indeximg",method = RequestMethod.GET)
    public ResultVO login(int len){
        return imgService.listIndexImgs(len);
    }
}