（1）新建springboot项目

下一步

下一步

点击‘finish’完成

BaseServer2Application.java为应用启动类，这里可以根据实际业务情况放一些初始化的过程。

详细过程不一一说明，直接看截图：

代码片段如下：

UserInfo.java

package com.yuq.bean;/** * 用户信息 * @author Administrator * */public class UserInfo {		private long rowId;		private String userId;		private String userName;	public long getRowId() {		return rowId;	}	public void setRowId(long rowId) {		this.rowId = rowId;	}	public String getUserId() {		return userId;	}	public void setUserId(String userId) {		this.userId = userId;	}	public String getUserName() {		return userName;	}	public void setUserName(String userName) {		this.userName = userName;	}}

UserInfoController.java

package com.yuq.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RestController;import com.yuq.bean.UserInfo;import com.yuq.service.UserInfoService;@RestController@RequestMapping(value = "/userInfo")public class UserInfoController {		@Autowired    private UserInfoService userInfoService;	@RequestMapping(value = "/getAll", method = RequestMethod.GET)	List
    
      getUserByGet() {		return userInfoService.selectAll();	}}
    

UserInfoMapper.java

package com.yuq.mapper;import java.util.List;import com.yuq.bean.UserInfo;public interface UserInfoMapper {		List
    
      selectAll();	}
    

UserInfoService.java

package com.yuq.service;import java.util.List;import com.yuq.bean.UserInfo;public interface UserInfoService {	List
    
      selectAll();	}
    

UserInfoServiceImpl.java

package com.yuq.service.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.yuq.bean.UserInfo;import com.yuq.mapper.UserInfoMapper;import com.yuq.service.UserInfoService;@Servicepublic class UserInfoServiceImpl implements UserInfoService {	@Autowired    private UserInfoMapper mapper;		@Override	public List
    
      selectAll() {		return mapper.selectAll();	}}
    

BaseServerApplication.java

注意：启动类为  项目名 +Application，这里根据你的项目名来的。

package com.yuq.web;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.ComponentScan;@SpringBootApplication@ComponentScan("com.yuq.*")@MapperScan("com.yuq.mapper")public class BaseServerApplication {	public static void main(String[] args) {		System.out.println("this is BaseServerApplication...");		SpringApplication.run(BaseServerApplication.class, args);	}}

UserInfoMapper.xml

    
      
         
          
          
        
         
     
          row_id, user_id, user_name  
         
         select          row_id, user_id, user_name    from user_info    
    

application.properties

spring.datasource.type=com.alibaba.druid.pool.DruidDataSourcespring.datasource.driver-class-name=com.mysql.cj.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/db_base_server?serverTimezone=CTT&useUnicode=true&characterEncoding=utf-8&allowMultiQueries=truespring.datasource.username=rootspring.datasource.password=root123# mybatis.config= classpath:mybatis-config.xmlmybatis.mapperLocations=classpath:mappers/*.xml# domain object's package mybatis.typeAliasesPackage=com.yuq.bean#server.port=8011#server.session.timeout=10#server.tomcat.uri-encoding=UTF-8

pom.xml

    
    	
     
      4.0.0
     	
     
      com.yuq
     	
     
      base-server
     	
     
      0.0.1-SNAPSHOT
     	
     
      war
     	
     
      base-server
     	
     
      Demo project for Spring Boot
     	
     		
      
       org.springframework.boot
      		
      
       spring-boot-starter-parent
      		
      
       2.0.3.RELEASE
      		
       
      	
     	
     		
      
       UTF-8
      		
      
       UTF-8
      		
      
       1.8
      	
     	
     		
      			
       
        org.springframework.boot
       			
       
        spring-boot-starter-web
       		
      		
      			
       
        org.springframework.boot
       			
       
        spring-boot-starter-tomcat
       			
       
        provided
       		
      		
      			
       
        org.springframework.boot
       			
       
        spring-boot-starter-test
       			
       
        test
       		
      				
      		
      		    
       
        mysql
       		    
       
        mysql-connector-java
       		    
       
        8.0.11
       		
      								
      		
      	        
       
        org.mybatis.spring.boot
       	        
       
        mybatis-spring-boot-starter
       	        
       
        1.2.1
               
                      
      		
      		    
       
        com.alibaba
       		    
       
        druid
       		    
       
        1.1.10
       		
              	
     	
     		
      			
       				
        
         org.springframework.boot
        				
        
         spring-boot-maven-plugin
        			
       			
       			
       	            
        
         org.apache.maven.plugins
        	            
        
         maven-war-plugin
        	            
        
         2.6
        	            
        	                
         
          false
         	            
        	        
       		
      	
     
    

其他地方不变。

这里需要注意的是，所有的配置在application.properties文件中完成（包括web.xml，springboot中已经取消web.xml文件）。

Application类文件中，默认情况下时不需要配置@ComponentScan这个注解的。 因为Application类，在启动的时候，默认是加载和Application类所在同一个目录下的所有类，包括所有子目录下的类。所以一般情况下，启动类的位置是 有特殊要求的。 

由于实际项目过程中，需要考虑各个文件的存放目录，包括controller、dao、service等。所以当类在不同目录下时，需要在Application类文件中使用@ComponentScan这个注解来申明。