idea+maven+springboot+mybatis

Posted 2020-10-09 遥望星空

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确认maven环境,安装maven在这里就不赘述了.

在idea新建maven项目

下图中填上你Maven安装的目录

打开pom文件,导入jar包(手动敲入/拷贝)

下面是配置之后的pom文件内容

<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">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.xzk</groupId>
  <artifactId>testboot</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>testboot Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.3.RELEASE</version>
  </parent>
  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
  <build>
    <finalName>testboot</finalName>
  </build>
</project>

maven刷新/重新生成,确认导入包,

在main下新建java文件夹

先按这个目录/包结构建立

新建入口类Application.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableAutoConfiguration
@ComponentScan
public class Application extends SpringBootServletInitializer{
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

实体model

public class User {
    private String name;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

控制层

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@EnableAutoConfiguration
@RequestMapping("/testboot")
public class TestBootController {
    @RequestMapping("getuser")
    public User getUser() {
        User user = new User();
        user.setName("test");
        return user;
    }
}



启动,

或者按alt+F12, 在路径后边加上 mvn spring-boot:run 回车

或者在cmd, 项目根目录下键入 mvn spring-boot:run

集成mybatis

不用说,先配置pom文件,导入jar包,最终的pom内容:

<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">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.xu</groupId>
  <artifactId>testboot</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>testboot Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
  </properties>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--支持使用 JDBC 访问数据库-->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>

    <!--Mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.8</version>
    </dependency>
    <!--mysql / DataSource-->
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-jdbc</artifactId>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!--Json Support-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.1.43</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/log4j/log4j -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

  </dependencies>
  <build>
    <plugins>
      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
      </plugin>
    </plugins>
  </build>
</project>

接下来配置数据源,在resource下新建文件

application.properties

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=gbk&zeroDateTimeBehavior=convertToNull
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
server.address=127.0.0.1
server.port=9090

在Application.java中配置DataSource，SqlSeesion. 最终的Application.class内容:

import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.log4j.Logger;
import org.apache.tomcat.jdbc.pool.DataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;


//@EnableAutoConfiguration
//@Configuration
//@ComponentScan
@SpringBootApplication
@MapperScan("com.xu.boot.mapper")
public class Application {
    private static Logger logger = Logger.getLogger(Application.class);

    //DataSource配置
    @Bean
    @ConfigurationProperties(prefix="spring.datasource")
    public DataSource dataSource() {
        return new DataSource();
    }

    //提供SqlSeesion
    @Bean
    public SqlSessionFactory sqlSessionFactoryBean() throws Exception {

        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSource());

        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

        sqlSessionFactoryBean.setMapperLocations(resolver.getResources("classpath:/mybatis/*.xml"));

        return sqlSessionFactoryBean.getObject();
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

    /**
     * Main Start
     */
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
        logger.info("============= SpringBoot Start Success =============");
    }

}

其中:

如果目录结构和springboot推荐的一样,那么只加@SpringBootApplication这一个注解就可以.

这个不用多说,mapper的映射路径

这个spring.datasource是和properties文件前缀匹配.

这个是xml的映射.

最终的目录结构:

这个yml文件是空的, 里边也可以配置内容,但一般我们都习惯在properties里面配置.

接下来是controller,service,mapper, 也可以用mybatis-generator自动生成

首先，UserController.java

import com.alibaba.fastjson.JSONArray;
import com.xu.boot.model.User;
import com.xu.boot.service.UserService;
import org.apache.catalina.servlet4preview.http.HttpServletRequest;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

    private Logger logger = Logger.getLogger(UserController.class);

    @Autowired
    private UserService userService;

    @RequestMapping("/getUserById")
    @ResponseBody
    public User getUserById(HttpServletRequest request) {
        int id = Integer.parseInt(request.getParameter("id"));
        User user = userService.getUserById(id);
        if(user!=null){
            logger.info(JSONArray.toJSON(user));
        }
        return user;
    }
}

然后是UserService.java

import com.xu.boot.model.User;

public interface UserService {
    User getUserById(int id);
}

然后UserServiceImpl.java

import com.xu.boot.mapper.UserMapper;
import com.xu.boot.model.User;
import com.xu.boot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    UserMapper mapper;

    @Override
    public User getUserById(int id) {
        return mapper.getUserById(id);
    }
}

然后UserMapper.java

import com.xu.boot.model.User;

public interface UserMapper {
    User getUserById(int id);
}

然后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.xu.boot.mapper.UserMapper">
    <select id="getUserById" resultType="com.xu.boot.model.User" parameterType="java.lang.Integer">
        select name, age,password from user WHERE id=#{id,jdbcType=INTEGER};
    </select>

</mapper>

接下来启动Application, 运行main方法.在浏览器输入http://localhost:9090/getUserById?id=1

转自：http://www.cnblogs.com/-xuzhankun/p/6627424.html

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