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
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 {@Resourceprivate IndexImgMapper indexImgMapper;@Overridepublic 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 {@Resourceprivate 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);}
}
