基于SpringBoot的SSMP整合案例
简介：SSMP(Spring+SpringMVC+MyBatis)，通过SpringBoot整合SSMP来完成增删改查案例。
功能开发模块
- 实体类开发————使用Lombok快速制作实体类
- Dao开发————整合MyBatisPlus，制作数据层测试
- Service开发————基于MyBatisPlus进行增量开发，制作业务层测试类
- Controller开发————基于Restful开发，使用PostMan测试接口功能
- Controller开发————前后端开发协议制作
- 页面开发————基于VUE+ElementUI制作，前后端联调，页面数据处理，页面消息处理
- 列表
- 新增
- 修改
- 删除
- 分页
- 查询
- 项目异常处理
- 按条件查询————页面功能调整、Controller修正功能、Service修正功能
创建模块
数据层(Dao层)操作
创建项目
pom.xml
需要添加mybatis-plus的配置文件。
<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>2.7.6</version> <relativePath/> </parent> <groupId>com.example</groupId> <artifactId>SpringBootSSMP</artifactId> <version>0.0.1-SNAPSHOT</version> <name>SpringBootSSMP</name> <description>SpringBootSSMP</description> <properties> <java.version>17</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.2.6</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build></project>创建数据库
-- ------------------------------ Table structure for tbl_book-- ----------------------------DROP TABLE IF EXISTS `tbl_book`;CREATE TABLE `tbl_book` ( `id` int(11) NOT NULL AUTO_INCREMENT, `type` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, `description` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL, PRIMARY KEY (`id`) USING BTREE) ENGINE = InnoDB AUTO_INCREMENT = 51 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;-- ------------------------------ Records of tbl_book-- ----------------------------INSERT INTO `tbl_book` VALUES (1, '计算机理论', 'Spring实战 第5版', 'Spring入门经典教程，深入理解Spring原理技术内幕');INSERT INTO `tbl_book` VALUES (2, '计算机理论', 'Spring 5核心原理与30个类手写实战', '十年沉淀之作，手写Spring精华思想');INSERT INTO `tbl_book` VALUES (3, '计算机理论', 'Spring 5 设计模式', '深入Spring源码剖析Spring源码中蕴含的10大设计模式');INSERT INTO `tbl_book` VALUES (4, '计算机理论', 'Spring MVC+MyBatis开发从入门到项目实战', '全方位解析面向Web应用的轻量级框架，带你成为Spring MVC开发高手');INSERT INTO `tbl_book` VALUES (5, '计算机理论', '轻量级Java Web企业应用实战', '源码级剖析Spring框架，适合已掌握Java基础的读者');INSERT INTO `tbl_book` VALUES (6, '计算机理论', 'Java核心技术 卷I 基础知识（原书第11版）', 'Core Java 第11版，Jolt大奖获奖作品，针对Java SE9、10、11全面更新');INSERT INTO `tbl_book` VALUES (7, '计算机理论', '深入理解Java虚拟机', '5个维度全面剖析JVM，大厂面试知识点全覆盖');INSERT INTO `tbl_book` VALUES (8, '计算机理论', 'Java编程思想（第4版）', 'Java学习必读经典,殿堂级著作！赢得了全球程序员的广泛赞誉');INSERT INTO `tbl_book` VALUES (9, '计算机理论', '零基础学Java（全彩版）', '零基础自学编程的入门图书，由浅入深，详解Java语言的编程思想和核心技术');INSERT INTO `tbl_book` VALUES (10, '市场营销', '直播就该这么做：主播高效沟通实战指南', '李子柒、李佳琦、薇娅成长为网红的秘密都在书中');INSERT INTO `tbl_book` VALUES (11, '市场营销', '直播销讲实战一本通', '和秋叶一起学系列网络营销书籍');INSERT INTO `tbl_book` VALUES (12, '市场营销', '直播带货：淘宝、天猫直播从新手到高手', '一本教你如何玩转直播的书，10堂课轻松实现带货月入3W+');
yml
server: port: 80spring: datasource: druid: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3306/mybatis" /> lonbok实体类快速开发
简介：一个提供一组注解来简化POJO实体类的开发的Java库。
导入依赖
<dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId></dependency>
创建Book类
package com.example.springbootssmp.domain;//lombokimport lombok.Data;@Data// @Data注解实现了类的除了构造方法外的所有方法的自动生成，大大简化了开发public class Book { private Integer id; private String type; private String name; private String description;}
创建BookDao
package com.example.springbootssmp.dao;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.example.springbootssmp.domain.Book;import org.apache.ibatis.annotations.Mapper;@Mapperpublic interface BookDao extends BaseMapper<Book> {}
数据层开发（实现基础的CRUD)
测试dao层
测试代码
测试基本的增删改查
@SpringBootTestpublic class BookDaoTestCase { @Autowired private BookDao bookDao; @Test void testGetById(){ System.out.println(bookDao.selectById(1)); } @Test void testSave(){ Book book = new Book(); book.setType("测试数据123"); book.setName("测试数据123"); book.setDescription("测试数据123"); bookDao.insert(book); } @Test void testUpdate(){ Book book = new Book(); book.setId(17); book.setType("测试数据abcdefg"); book.setName("测试数据123"); book.setDescription("测试数据123"); bookDao.updateById(book); } @Test void testDelete(){ bookDao.deleteById(16); } @Test void testGetAll(){ bookDao.selectList(null); } }
分页查询
创建配置文件
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MPConfig { @Bean public MybatisPlusInterceptor mybatisPlusInterceptor(){ MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); interceptor.addInnerInterceptor(new PaginationInnerInterceptor()); return interceptor; }}
测试代码
@Testvoid testGetPage(){ IPage page = new Page(2,5); // 从第二页开始查 每页最多5个记录 bookDao.selectPage(page, null); System.out.println(page.getCurrent()); System.out.println(page.getSize()); System.out.println(page.getTotal()); System.out.println(page.getPages()); System.out.println(page.getRecords());}
运行结果
条件查询
@Test void testGetBy(){ QueryWrapper<Book> qw = new QueryWrapper<>(); // like 条件模糊查询 查询name like Spring的 %Spring%的样子的 qw.like("name","Spring"); System.out.println(bookDao.selectList(qw)); } @Test void testGetBy2(){ String name = "1"; LambdaQueryWrapper<Book> lqw = new LambdaQueryWrapper<Book>(); //if(name != null) lqw.like(Book::getName,name); lqw.like(name != null,Book::getName,name); // 查询之前先看看name是否为空 System.out.println(bookDao.selectList(lqw)); }
业务层（Service）
概述：Service实现对Dao层的控制，即业务层对数据层的控制。
注意：需要注意的是，Service的方法命名的方式需要与Dao层有所区别一点，防止搞混。
基础CRUD
方式一（原始开发）
BookService.java
public interface BookService { Boolean save(Book book); Boolean update(Book book); Boolean delete(Integer id); Book getById(Integer id); List<Book> getAll(); IPage<Book> getPage(int currentPage,int pageSize);}
BookServiceImpl.java
@Servicepublic class BookServiceImpl implements BookService { @Autowired private BookDao bookDao; @Override public Boolean save(Book book) { return bookDao.insert(book) > 0; } @Override public Boolean update(Book book) { return bookDao.updateById(book) > 0; } @Override public Boolean delete(Integer id) { return bookDao.deleteById(id) > 0; } @Override public Book getById(Integer id) { return bookDao.selectById(id); } @Override public List<Book> getAll() { return bookDao.selectList(null); } @Override public IPage<Book> getPage(int currentPage, int pageSize) { IPage page = new Page(currentPage,pageSize); bookDao.selectPage(page,null); return page; }}
方式二（业务快速开发）
文件结构
IBookService.java
public interface IBookService extends IService<Book> {//添加非通用操作API接口 boolean saveBook(Book book); boolean modify(Book book); boolean delete(Integer id); IPage<Book> getPage(int currentPage, int pageSize); IPage<Book> getPage(int currentPage, int pageSize, Book book);}
BookServiceImpl.java
@Servicepublic class BookServiceImpl extends ServiceImpl<BookDao, Book> implements IBookService { @Autowired private BookDao bookDao;//添加非通用操作API @Override public boolean saveBook(Book book) { return bookDao.insert(book) > 0; } @Override public boolean modify(Book book) { return bookDao.updateById(book) > 0; } @Override public boolean delete(Integer id) { return bookDao.deleteById(id) > 0; } @Override public IPage<Book> getPage(int currentPage, int pageSize) { IPage page = new Page(currentPage,pageSize); bookDao.selectPage(page,null); return page; } @Override public IPage<Book> getPage(int currentPage, int pageSize, Book book) { LambdaQueryWrapper<Book> lqw = new LambdaQueryWrapper<Book>(); lqw.like(Strings.isNotEmpty(book.getType()),Book::getType,book.getType()); lqw.like(Strings.isNotEmpty(book.getName()),Book::getName,book.getName()); lqw.like(Strings.isNotEmpty(book.getDescription()),Book::getDescription,book.getDescription()); IPage page = new Page(currentPage,pageSize); bookDao.selectPage(page,lqw); return page; }}
测试类
文件结构
BookServiceTest.java
@SpringBootTestpublic class BookServiceTest { @Autowired private IBookService bookService; @Test void testGetById(){ System.out.println(bookService.getById(4)); } @Test void testSave(){ Book book = new Book(); book.setType("测试数据123"); book.setName("测试数据123"); book.setDescription("测试数据123"); bookService.save(book); } @Test void testUpdate(){ Book book = new Book(); book.setId(17); book.setType("-----------------"); book.setName("测试数据123"); book.setDescription("测试数据123"); bookService.updateById(book); } @Test void testDelete(){ bookService.removeById(18); } @Test void testGetAll(){ bookService.list(); } @Test void testGetPage(){ IPage<Book> page = new Page<Book>(2,5); bookService.page(page); System.out.println(page.getCurrent()); System.out.println(page.getSize()); System.out.println(page.getTotal()); System.out.println(page.getPages()); System.out.println(page.getRecords()); }}
运行结果
表现层（Controller）
这里的Restful风格需要参考这篇文章：restful风格快速入门
接受参数：
- 实体数据：@RequestBody
- 路径变量：@PathVariable
方式一
package com.example.springbootssmp.controller;import com.baomidou.mybatisplus.core.metadata.IPage;import com.example.springbootssmp.domain.Book;import com.example.springbootssmp.service.IBookService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.*;import java.util.List;@RestController@RequestMapping("/books")public class BookController { @Autowired private IBookService bookService; @GetMapping public List<Book> getAll(){ return bookService.list(); } @PostMapping public Boolean save(@RequestBody Book book){ return bookService.save(book); } @PutMapping public Boolean update(@RequestBody Book book){ return bookService.modify(book); } @DeleteMapping("{id}") public Boolean delete(@PathVariable Integer id){ return bookService.delete(id); } @GetMapping("{id}") public Book getById(@PathVariable Integer id){ return bookService.getById(id); } @GetMapping("{currentPage}/{pageSize}") public IPage<Book> getPage(@PathVariable int currentPage,@PathVariable int pageSize){ return bookService.getPage(currentPage,pageSize, null); }}
方式一存在着问题，问题在于对于返回的数据，没有一个标识，使得我们知道数据是否查询成功，如果查询失败了，怎么返回失败的信息，于是我们就在方式二中进行了完善。
这些问题导致了没有没有一个统一的返回值结果，不便于前端开发的读取数据，于是在方式二中就创建了Tool类的前后端协议。
方式二
创建util包的Tool类
package com.example.springbootssmp.controller.util;import lombok.Data;@Datapublic class Tool { private Boolean flag; // 查询是否成功 private Object data; // 查询获得的数据 private String msg; // 返回的信息 public Tool(){} public Tool(Boolean flag){ this.flag = flag; } public Tool(Boolean flag,Object data){ this.flag = flag; this.data = data; } public Tool(Boolean flag,String msg){ this.flag = flag; this.msg = msg; } public Tool(String msg){ this.flag = false; this.msg = msg; }}
完善BookController类
@RestController@RequestMapping("/books")public class BookController { @Autowired private IBookService bookService; @GetMapping public Tool getAll(){ return new Tool(true, bookService.list()); } @PostMapping public Tool save(@RequestBody Book book) throws IOException { if (book.getName().equals("123") ) throw new IOException(); boolean flag = bookService.save(book); return new Tool(flag, flag " />
最后的运行结果
访问地址：http://localhost/pages/books.html
