springboot+vue+mybatis-plus+axios实现商品的CRUD
简介
这是一篇案例，这个案例，在这个案例之中，我向大家展示，传统的增删除改，在springboot，vue, mybatis-plus, axios这几个框架下，可以有多么的简单，相信大家看完之后，也会觉得编程最难的还是业务逻辑和算法，不论是前端还是后端。
环境准备
数据库
选择这个商品类型的数据库一个是比较贴合实际，另一个原因是这个数据库里面有一个status属性，我会在下面文章中演示一下这个属性在开发中，怎么进行处理。
/* Navicat MySQL Data Transfer Source Server : 本机 Source Server Type : MySQL Source Server Version : 80024 Source Host : localhost:3306 Source Schema : mybatis Target Server Type : MySQL Target Server Version : 80024 File Encoding : 65001 Date: 12/01/2023 14:09:13 */ SET NAMES utf8mb4; SET FOREIGN_KEY_CHECKS = 0; -- ---------------------------- -- Table structure for tb_brand -- ---------------------------- DROP TABLE IF EXISTS `brand`; CREATE TABLE `brand` ( `id` int NOT NULL AUTO_INCREMENT, `brand_name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, `company_name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, `ordered` int NULL DEFAULT NULL, `description` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL, `status` int NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_0900_ai_ci ROW_FORMAT = Dynamic; -- ---------------------------- -- Records of tb_brand -- ---------------------------- INSERT INTO `brand` VALUES (1, '三只松鼠', '三只松鼠股份有限公司', 5, '好吃不上火', 0); INSERT INTO `brand` VALUES (2, '华为', '华为技术有限公司', 100, '华为致力于把数字世界带入每个人、每个家庭、每个组织，构建万物互联的智能世界', 1); INSERT INTO `brand` VALUES (3, '小米', '小米科技有限公司', 50, 'are you ok', 1); SET FOREIGN_KEY_CHECKS = 1;
创建项目
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.7.7</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringBootCRUD</artifactId> <version>0.0.1-SNAPSHOT</version> <name>SpringBootCRUD</name> <description>SpringBootCRUD</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <!--lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--fastjson--> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.62</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
application.properties
spring.datasource.username=root spring.datasource.password=123456 spring.datasource.url=jdbc:mysql://localhost:3306/projectdatabase?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
前端
js
axios.js源码
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o=n(23);r.prototype.throwIfRequested=function(){if(this.reason)throw this.reason},r.source=function(){var e,t=new r(function(t){e=t});return{token:t,cancel:e}},e.exports=r},function(e,t){"use strict";e.exports=function(e){return function(t){return e.apply(null,t)}}}])}); //# sourceMappingURL=axios.min.map • 9
html
前端的话，由于我们这个是一个基础的演示样例，所以了这个前端就做的不是特别好看，这样也有好处，因为使用eleement-ui来写前端的话，会让前端很庞杂，不适合入门教学，我这里写的就是最纯粹的，那些花里花哨的前端框架还没有出来的时候，当时大家是怎么前后端发送请求的。
项目结构
重要的是观察我这里的增加，删除，更新按钮，和mouted里面的axios怎么写的，怎么给后端发送请求的，特别是删除，更新事件如何传送id到后端。
index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <div id="app"> <a href="/add"><input type="button" value="新增"></a><br> <hr> <table id="brandTable" border="1" cellspacing="0" width="100%"> <tr> <th>序号</th> <th>品牌名称</th> <th>企业名称</th> <th>排序</th> <th>品牌介绍</th> <th>状态</th> <th>操作</th> </tr> <!-- 使用v-for遍历tr --> <tr v-for="(brand,i) in brands" align="center" > <td>{{i + 1}}</td> <td>{{brand.brandName}}</td> <td>{{brand.companyName}}</td> <td>{{brand.ordered}}</td> <td>{{brand.description}}</td> <td>{{brand.statusStr}}</td> <td><input type="button" id="update" @click="updateId(brand.id)" value="修改"> <input type="button" id="delete" @click="deleteId(brand.id)" value="删除"></td> </tr> </table> </div> <script src="js/axios-0.18.0.js"></script> <script src="js/vue.js"></script> </body> <script> new Vue({ el:"#app", // 这里写那个上面网页的div的id名称 data(){ return{ brands:[] } }, mounted(){ // 当网页加载的时候加载 let _this = this; // 制作一个临时的this指针 axios({ method:"get", url:"http://localhost:8080/selectAll" }).then(function (response){ console.log(response.data) _this.brands = response.data; }) }, methods: { updateId(id){ let _this = this; axios({ method:"get", url:"http://localhost:8080/update?id"+id, data:id }).then(resp=>{ location.href = "http://localhost:8080/update" }) }, deleteId(id) { let _this = this; axios({ method:"post", url:"http://localhost:8080/delete", data:id }).then(resp=>{ if (resp.data){ location.href = "http://localhost:8080/" } else { alert("删除失败") } }) } } }) </script> </html>
update.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>更新商品</title> </head> <body> <div id="app"> <h3>更新商品</h3> <form action="" method="post"> 商品名称：<input id="brandName" v-model="brand.brandName" name="brandName"><br> 企业名称：<input id="companyName" v-model="brand.companyName" name="companyName"><br> 排序：<input id="ordered" v-model="brand.ordered" name="ordered"><br> 描述信息：<textarea rows="5" cols="20" id="description" v-model="brand.description" name="description"></textarea><br> 状态： <input type="radio" name="status" v-model="brand.status" value="0">禁用 <input type="radio" name="status" v-model="brand.status" value="1">启用<br> <!-- <input type="button" id="btn" @click="submitForm" value="提交">--> <input type="button" id="btn" @click="submitForm" value="提交"> </form> </div> <script src="js/axios-0.18.0.js"></script> <script src="js/vue.js"></script> <script> new Vue({ el:"#app", data() { return{ brand:{ } } }, methods:{ submitForm() { var _this = this; axios({ method: "post", url:"http://localhost:8080/addBrand", data:_this.brand }).then(function (response) { if (rresp.data){ // 添加成功之后返回原来的页面 location.href="http://localhost:8080/"; } else{ alert("添加失败"); } }) } } }) </script> </body> </html>
addBrand.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>添加商品</title> </head> <body> <div id="app"> <h3>添加商品</h3> <form action="" method="post"> 商品名称：<input id="brandName" v-model="brand.brandName" name="brandName"><br> 企业名称：<input id="companyName" v-model="brand.companyName" name="companyName"><br> 排序：<input id="ordered" v-model="brand.ordered" name="ordered"><br> 描述信息：<textarea rows="5" cols="20" id="description" v-model="brand.description" name="description"></textarea><br> 状态： <input type="radio" name="status" v-model="brand.status" value="0">禁用 <input type="radio" name="status" v-model="brand.status" value="1">启用<br> <!-- <input type="button" id="btn" @click="submitForm" value="提交">--> <input type="button" id="btn" @click="submitForm" value="提交"> </form> </div> <script src="js/axios-0.18.0.js"></script> <script src="js/vue.js"></script> <script> new Vue({ el:"#app", data() { return{ brand:{ } } }, methods:{ submitForm() { var _this = this; axios({ method: "post", url:"http://localhost:8080/addBrand", data:_this.brand }).then(function (response) { if (resp.data){ // 添加成功之后返回原来的页面 location.href="http://localhost:8080/"; } else { alert("添加失败") } }) } } }) </script> </body> </html>
后端
Brand
对于Bean这些类类说，需要注意的是，在没有自己写resultMap的情况下，对于数据库中没有用下划线分割的属性名，需要保留原名，对于用来下划线命名的属性，需要使用驼峰命名法。
package com.example.springbootcrud.Bean; import com.baomidou.mybatisplus.annotation.IdType; import com.baomidou.mybatisplus.annotation.TableId; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @AllArgsConstructor @NoArgsConstructor public class Brand { private Integer id; private String brandName; // 需要注意的是具体类的命名不能有下划线要采取驼峰命名法 不然数据查不到 private String companyName; private Integer ordered; private String description; // 状态：0：禁用 1：启用 private Integer status; // 用于判断对status进行数据处理 public String getStatusStr() { if(this.status == 1){ return "启用"; } return "禁用"; } }
BrandDao
这个没啥可以说的，只能说mybatis-plus永远的神。
package com.example.springbootcrud.Dao; import com.baomidou.mybatisplus.core.conditions.Wrapper; import com.baomidou.mybatisplus.core.mapper.BaseMapper; import com.example.springbootcrud.Bean.Brand; import org.apache.ibatis.annotations.Mapper; import java.util.List; @Mapper public interface BrandDao extends BaseMapper<Brand> { }
BrandController
对于BrandController类来说，如果希望上面每个按钮或者超链接对应的网页链接，不会404的话，需要自己再写一个引导方法，因为在运行过程中访问地址的时候需要的写路径名称，全路径的话需要把自己的项目名字都加上去，那样太麻烦了，所以后面想出来了，这种写引导方法的办法。
package com.example.springbootcrud.Controller; import com.alibaba.fastjson.JSON; import com.example.springbootcrud.Bean.Brand; import com.example.springbootcrud.Dao.BrandDao; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; import javax.servlet.ServletException; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.IOException; import java.util.List; @Controller public class BrandController { @Autowired BrandDao brandDao; @RequestMapping("/") // 设置默认页面 public String index(){ return "index.html"; } @RequestMapping("/add") public String add(){ return "addBrand.html"; } @RequestMapping("/update") public String update(){ return "updateBrand.html"; } @ResponseBody @GetMapping("/selectAll") public List<Brand> selectAll(){ System.out.println(brandDao.selectList(null).toString()); // return JSON.toJSONString(brandDao.selectList(null)); return brandDao.selectList(null); } @RequestMapping("/addBrand") @ResponseBody public String addBrand(HttpServletRequest request)throws ServletException, IOException { BufferedReader reader = request.getReader(); String params = reader.readLine(); Brand brand = JSON.parseObject(params, Brand.class); System.out.println(brand); brandDao.insert(brand); return "success"; } @RequestMapping("/updateId") @ResponseBody public String updateBrand(HttpServletRequest request)throws ServletException, IOException{ BufferedReader reader = request.getReader(); String params = reader.readLine(); Brand brand = JSON.parseObject(params, Brand.class); System.out.println(brand); brandDao.updateById(brand); return "success"; } @RequestMapping("/delete") @ResponseBody public String deleteBrand(HttpServletRequest request)throws ServletException, IOException{ BufferedReader reader = request.getReader(); String params = reader.readLine(); System.out.println(params); if (brandDao.deleteById(Integer.parseInt(params)) > 0) return "success"; return "false"; } }
测试部分
BrandDaoTestCase
写项目一定要写测试类，则很重要的，测试参与的每一个方法是否正确。
package com.example.springbootcrud.Dao; import com.example.springbootcrud.Bean.Brand; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; @SpringBootTest public class BrandDaoTestCase { @Autowired private BrandDao brandDao; @Test void testSelectAll(){ System.out.println(brandDao.selectList(null)); } @Test void testSave(){ Brand brand = new Brand(); brand.setBrandName("测试数据1"); brand.setCompanyName("测试数据2"); brand.setOrdered(1); brand.setDescription("测试数据3"); brand.setStatus(1); System.out.println(brand); brandDao.insert(brand); } @Test void testUpdate(){ Brand brand = new Brand(); brand.setId(7); brand.setBrandName("1"); brand.setCompanyName("测试数据2"); brand.setOrdered(1); brand.setDescription("测试数据3"); brand.setStatus(1); System.out.println(brand); brandDao.updateById(brand); } @Test void testDelete(){ brandDao.deleteById(4); } }
运行结果：
