2019-09-15
A, Maven build environment
1. Import coordinate jar
1 <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 http://maven.apache.org/maven-v4_0_0.xsd"> 2 <modelVersion>4.0.0</modelVersion> 3 <groupId>com.panda</groupId> 4 <artifactId>Panda_Maven_SpringBoot</artifactId> 5 <packaging>war</packaging> 6 <version>0.0.1-SNAPSHOT</version> 7 <name>Panda_Maven_SpringBoot Maven Webapp</name> 8 <url>http://maven.apache.org</url> 9 <!-- 父起步依赖 --> 10 <parent> 11 <groupId>org.springframework.boot</groupId> 12 <artifactId>spring-boot-starter-parent</artifactId> 13 <version>2.0.1.RELEASE</version> 14 </parent> 15 <dependencies> 16 <dependency> 17 <groupId>junit</groupId> 18 <artifactId>junit</artifactId> 19 <version>3.8.1</version> 20 <scope>test</scope> 21 </dependency> 22 <!-- web起步依赖 --> 23 <dependency> 24 <groupId>org.springframework.boot</groupId> 25 <artifactId>spring-boot-starter-web</artifactId> 26 <version>2.1.8.RELEASE</version> 27 </dependency> 28 <!-- 热部署依赖 --> 29 < Dependency > 30 < the groupId > org.springframework.boot </ the groupId > 31 is < the artifactId > Spring-Boot-DevTools </ the artifactId > 32 </ dependency > 33 is <-! Automatically prompted profile based on attributes of the content dependent Writing - -> 34 is < dependency > 35 < the groupId > org.springframework.boot </ the groupId > 36 < the artifactId > Spring-Configuration-Processor Boot- </the artifactId > 37 [ </ dependency > 38 is <-! introducing dependent coordinates associated mybatis -> 39 < dependency > 40 < the groupId > org.mybatis.spring.boot </ the groupId > 41 is < the artifactId > mybatis-Spring-Boot-Starter </ the artifactId > 42 is < Version > 2.1.0 </ Version > 43 is </ dependency > 44 is <-! introduced mysql coordinate dependence -> 45 <dependency> 46 <groupId>mysql</groupId> 47 <artifactId>mysql-connector-java</artifactId> 48 </dependency> 49 </dependencies> 50 <build> 51 <finalName>Panda_Maven_SpringBoot</finalName> 52 </build> 53 </project>
2. Create an entry class
1 package com.panda.controller; 2 3 import org.mybatis.spring.annotation.MapperScan; 4 import org.springframework.boot.SpringApplication; 5 import org.springframework.boot.autoconfigure.SpringBootApplication; 6 7 /** 8 * @author Jpanda 9 */ 10 //springboot入口类 11 @SpringBootApplication 12 //扫描mappers包 13 @MapperScan("com.panda.mappers") 14 public class SpringBootApplicationConfig { 15 // 程序入口 16 public static void main(String[] args) { 17 // run: Run inlet class parameter is the class bytecode object inlet 18 is SpringApplication.run (SpringBootApplicationConfig.class); . 19 } 20 is }
3. Create a bean class
1 package com.panda.beans; 2 3 /** 4 * @author Jpanda 5 */ 6 public class User { 7 private Integer id; 8 private String username; 9 private String password; 10 11 public Integer getId() { 12 return id; 13 } 14 15 public void setId(Integer id) { 16 this.id = id; 17 } 18 19 public String getUsername() { 20 return username; 21 } 22 23 public void setUsername(String username) { 24 this.username = username; 25 } 26 27 public String getPassword() { 28 return password; 29 } 30 31 public void setPassword(String password) { 32 this.password = password; 33 } 34 35 public User(Integer id, String username, String password) { 36 super(); 37 this.id = id; 38 this.username = username; 39 this.password = password; 40 } 41 42 public User() { 43 super(); 44 } 45 46 @Override 47 public String toString() { 48 return "User [id=" + id + ", username=" + username + ", password=" + password + "]"; 49 } 50 51 }
4. Create an interface mapper
1 package com.panda.mappers; 2 3 import java.util.List; 4 5 import org.apache.ibatis.annotations.Mapper; 6 7 import com.panda.beans.User; 8 9 /** 10 * @author Jpanda 11 */ 12 @Mapper 13 public interface UserMapper { 14 public List<User> getUsers(); 15 }
5. Create a User of the database table (omitted)
6.sql map
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE mapper 3 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 4 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 5 <mapper namespace="com.panda.mappers.UserMapper"> 6 <select id="getUsers" resultType="com.panda.beans.User"> 7 select * from user 8 </select> 9 </mapper>
7. Configure a database connection, and relation springboot mybatis
1 #DB Configuration: 2 spring.datasource.driverClassName=com.mysql.jdbc.Driver 3 spring.datasource.url=jdbc:mysql://localhost:3307/user?useUnicode=true&characterEncoding=utf8 4 spring.datasource.username=root 5 spring.datasource.password=root 6 7 #spring and mybatis 8 #pojo alias package 9 mybatis.type-aliases-package=com.panda.beans 10 #upload mapperconfig files 11 mybatis.mapper-locations=classpath:UserMapperConfig.xml
8. Create Controller
1 package com.panda.controller; 2 3 import java.util.List; 4 5 import org.springframework.beans.factory.annotation.Autowired; 6 import org.springframework.stereotype.Controller; 7 import org.springframework.web.bind.annotation.RequestMapping; 8 import org.springframework.web.bind.annotation.ResponseBody; 9 10 import com.panda.beans.User; 11 import com.panda.mappers.UserMapper; 12 13 /** 14 * @author Jpanda 15 */ 16 @Controller 17 public class MybatisController { 18 @Autowired 19 private UserMapper userMapper; 20 21 @RequestMapping("/mybatis") 22 @ResponseBody 23 public List<User> getUsers() { 24 List<User> users = userMapper.getUsers(); 25 System.out.println(users); 26 return users; 27 } 28 }
9. Access test
