SpringBoot+Mybatis新手入门

SpringBoot对比于SpringMVC减少了很多配置文件，在搭建时更加快捷方便，由于内置了tomcat所以直接运行Application不需要在tomcat中运行。

1 在eclipse中新建maven项目，并按以下配置书写pom.xml

<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>SpringBoot</groupId>
  <artifactId>SpringBoot</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
   <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.4.RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

            <!-- MyBatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.1.1</version>
        </dependency>
             <!--对Jsp支持 -->
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>

        <!-- 支持jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

            <!-- 支持oracle -->
        <dependency>
    <groupId>com.oracle</groupId>
    <artifactId>ojdbc14</artifactId>
    <version>10.2.0.2.0</version>
</dependency>


    </dependencies>





  <build>

<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-compiler-plugin</artifactId>
             <version>3.1</version>
             <configuration>
                 <source>1.7</source>    <!-- Java版本号 --> 
                 <target>1.7</target>    
             </configuration>
</plugin>
</plugins>
</build>


</project>

2 新建如下目录结构

3 加载完jar包后，新建启动类application，启动类必须放在最外层，加载的时候会加载application所在目录及下级目录

package com.springboot.SpringBootHello;

import org.apache.log4j.Logger;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer;
import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
//此注解表示动态扫描DAO接口所在包
@MapperScan("com.springboot.SpringBootHello.dao")

//此注解表示该类启动类
@SpringBootApplication
public class Application implements  EmbeddedServletContainerCustomizer{
    private static Logger logger = Logger.getLogger(Application.class);

    public static void main(String[] args) {
        logger.info("=================开始成功=================");
        SpringApplication.run(Application.class, args);
        logger.info("=================启动成功=================");
    }
//这里是代码设置端口，也可以在application.properties文件中配置端口
    @Override
    public void customize(ConfigurableEmbeddedServletContainer cus) {
        // TODO Auto-generated method stub
        cus.setPort(8989);

    }
}

4 新建controller类，拦截动作

package com.springboot.SpringBootHello.controller;

import org.apache.log4j.Logger;
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;

import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;


//只需使用@Controller 标记一个类是Controller ，然后使用@RequestMapping 和@RequestParam 等一些注解用以定义URL 请求和Controller 方法之间的映射，这样的Controller 就能被外界访问到。
@Controller
public class IndexController {

    private static Logger logger = Logger.getLogger(IndexController.class);

    @RequestMapping("/hello")
     @ResponseBody
    public String index() {

        logger.info("=====进入index=====");

        return "hello";

    }
}   

在浏览器中输入地址：

===========上述操作后SpringBoot搭建的web的demon就好了=============

===============下面将Mybatis整合入SpringBoot中====================

1 首先确认在pom.xml中加载了mybatis及oracle驱动的包。
2 书写相关配置文件resource/config/application.propertities

#设置Tomcat端口，默认8080，此处端口也可在代码中设置，前文有提示
#server.port=8080
#设置项目ContextPath
server.context-path=/
#设置Tomcat编码
server.tomcat.uri-encoding=UTF-8
#设置视图解析器路径
spring.mvc.view.prefix=/WEB-INF/views/
#设置视图解析器后缀
spring.mvc.view.suffix=.jsp

#数据库配置
spring.datasource.url=jdbc:oracle:thin:@localhost:1521:orcl
spring.datasource.username=eastcom
spring.datasource.password=eastcom
spring.datasource.driver-class-name=oracle.jdbc.OracleDriver

#配置.xml文件
mybatis.mapper-locations=classpath:mappings/*.xml
#配置模型路径
mybatis.type-aliases-package=com.springboot.SpringBootHello.model

3书写maybatis的mapper文件/resources/mappings/UserMapper.xml (需在application.propertities中书写加载的路径
)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">

<!--对应项目中的dao路径-->
<mapper namespace="com.springboot.SpringBootHello.dao.UserDao">


    <select id="getNameById" parameterType="com.springboot.SpringBootHello.model.User" resultType="com.springboot.SpringBootHello.model.User">
        SELECT * FROM user1 WHERE ID = #{id}
    </select>
</mapper>

4新建UserDao类

package com.springboot.SpringBootHello.dao;

import org.apache.ibatis.annotations.Mapper;

import com.springboot.SpringBootHello.model.User;

//mybatis
@Mapper
public interface UserDao {
        public User getNameById(User user);
}

5新建User模型类

package com.springboot.SpringBootHello.model;

public class User {
private  String name;
private Integer id;
private Integer age;

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
public Integer getAge() {
    return age;
}
public void setAge(Integer age) {
    this.age = age;
}
}

6新建服务类

package com.springboot.SpringBootHello.service;

import com.springboot.SpringBootHello.model.User;

public interface UserService {

    public User getNameById(User user);
}

7新建实现类

package com.springboot.SpringBootHello.serviceImply;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.springboot.SpringBootHello.dao.UserDao;
import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;
@Service
public class UserServiceImply implements UserService{
    @Autowired
    private UserDao userdao;
    @Override
    public User getNameById(User user) {
        // TODO Auto-generated method stub
        return userdao.getNameById(user);
    }

}

8修改controller

package com.springboot.SpringBootHello.controller;

import org.apache.log4j.Logger;
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;

import com.springboot.SpringBootHello.model.User;
import com.springboot.SpringBootHello.service.UserService;



@Controller
public class IndexController {

    @Autowired
    private UserService userService;

    private static Logger logger = Logger.getLogger(IndexController.class);

    @RequestMapping("/hello")
     @ResponseBody
    public String index() {

        logger.info("=====进入index=====");

        return "hello";

    }



    @RequestMapping("/get")
     @ResponseBody
    public String get(User user) {

        logger.info("=====进入get=====");
        User user2=userService.getNameById(user);
        return user2.getName()+user2.getId()+user2.getAge();

    }
}

结果如图

注意事项：
配置文件:
pom.xml (Springboot,web,mybatis,tomcat,oracle等相关依赖)
application.properties和xml的路径需要在resources下
application.java需要放在最外层

理解以**解的含义及用法
@MapperScan
@Mapper
@SpringBootApplication
@Autowired
@Service
@RequestMapping(“/”)