spring boot 项目搭建
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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.test</groupId> <artifactId>springdemo</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.M1</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>6.0.6</scope> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.10</version> </dependency> </dependencies> <!--这个插件,可以将应用进行打包成一个可执行的jar包--> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> <resources> <!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹, 注意:如果没有这个,它会自动搜索resources下是否有mapper.xml文件, 如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.pet.mapper.PetMapper.selectByPrimaryKey--> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> <!--将resources目录下的配置文件编译进classes文件 --> <resource> <directory>src/main/resources</directory> </resource> </resources> </build> </project>
application.yml
server: port: 8088 spring: datasource: url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false driverClassName: com.mysql.jdbc.Driver username: root password: 123456 type: com.alibaba.druid.pool.DruidDataSource mybatis: #config-locations: mybatis/mybatis-config.xml
#xml文件路径 mapper-locations: com/apple/Mapper/*.xml type-aliases-package: com.apple.Base
访问数据库路径:
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.apple.Mapper.UserMapper"> <select id="selectUsers" resultType="com.apple.Base.Person"> select p_name,p_sex from person </select> </mapper>
namespace =UserMapper的路径
UserMapper.xml查询语句的id和UserMapper.java的方法名必须相同
UserMapper.java
package com.apple.Mapper; import com.apple.Base.Person; import org.apache.ibatis.annotations.Mapper; import org.springframework.stereotype.Component; @Mapper @Component public interface UserMapper { Person selectUsers(); }
UserService.java
package com.apple.Service; import com.apple.Base.Person; import com.apple.Mapper.UserMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class UserService { @Autowired private UserMapper userMapper; public Person selectUsers(){ System.out.println("222222222"); return userMapper.selectUsers(); } }
UserController.java
package com.apple.Controller; import com.apple.Base.Person; import com.apple.Service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; @Controller public class UserController { @Autowired private UserService userService; @ResponseBody @RequestMapping(value ="/selectUser") public Person selectUser(){ System.out.println("1111111111111111111111"); Person pp=userService.selectUsers(); System.out.println(pp.toString()); return pp; } }