spring boot简单的小demo(适合于初学者)

import com.example.demo2.com.example.dao.ShopDao;

import com.example.demo2.com.example.entity.Shops;

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;

import javax.annotation.Resource;

import java.util.List;

@RestController

public class ShopController {

    @Autowired

    private ShopDao shopdao;

    /*

    * 查询

    * */

    @RequestMapping("sele")

    @ResponseBody

    public List test(){

        List<Shops> finl = shopdao.finalAll();

        for (Shops shop : finl){

            System.out.println(shop.getNames());

            System.out.println(shop.getPass());

        }

        return finl;

    }

    /*

    * 添加

    * */

    @RequestMapping("add")

    @ResponseBody

    public String test1(String names,String pass,String sex){

        Shops shop = new Shops();

        shop.setNames(names);

        shop.setPass(pass);

        shop.setSex(sex);

       Integer result = shopdao.add(shop);

       String st = "添加失败";

       if(result>0){

           st = "添加成功";

       }

       return st;

    }

    /*

     *  修改

     * */

    @RequestMapping("upda")

    @ResponseBody

    public String test2(Integer id,String names,String pass,String sex){

        Shops shop = new Shops();

        shop.setId(id);

        shop.setNames(names);

        shop.setPass(pass);

        shop.setSex(sex);

        Integer result = shopdao.updates(shop);

        String st = "修改失败";

        if(result>0){

            st = "修改成功";

        }

        return st;

    }

    /*

     * 删除

     * */

    @RequestMapping("dele")

    @ResponseBody

    public String test3(Integer id){

        Integer result = shopdao.deletes(id);

        String st = "删除失败";

        if(result>0){

            st = "删除成功";

        }

        return st;

    }

}

dao层

import com.example.demo2.com.example.entity.Shops;

import org.apache.ibatis.annotations.Mapper;

import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper//声明是一个Mapper,与springbootApplication中的@MapperScan二选一写上即可

public interface ShopDao {

    //查询

    public List<Shops> finalAll();

    //添加

    public Integer add(Shops shop);

    //修改

    public Integer updates(Shops shop);

    //删除

    public Integer deletes(Integer id);

}

mapper

<?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.example.demo2.com.example.dao.ShopDao">

    <select id="finalAll" resultType="com.example.demo2.com.example.entity.Shops">

       select * from first

    </select>

    <insert id="add" parameterType="com.example.demo2.com.example.entity.Shops" useGeneratedKeys="true">

        INSERT INTO first(names,pass,sex) values(#{names},#{pass},#{sex})

    </insert>

    <update id="updates" parameterType="com.example.demo2.com.example.entity.Shops">

      update first set names =#{names},pass=#{pass},sex=#{sex} where id = #{id}

    </update>

    <delete id="deletes" parameterType="com.example.demo2.com.example.entity.Shops">

      delete from first where id =#{id}

    </delete>

</mapper>

application.yml

server:

  port: 8088

  context-path: /

spring:

    profiles:

        active: dev

    application:

        name: demo-2

    jackson:

        date-format: yyyy-MM-dd HH:mm:ss

        time-zone: GMT+8

        default-property-inclusion: non_null

    datasource:

        url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF8

        username: root

        password: root

        # 使用druid数据源

        type: com.alibaba.druid.pool.DruidDataSource

        driver-class-name: com.mysql.jdbc.Driver

        filters: stat

        maxActive: 20

        initialSize: 1

        maxWait: 60000

        minIdle: 1

        timeBetweenEvictionRunsMillis: 60000

        minEvictableIdleTimeMillis: 300000

        validationQuery: select 'x'

        testWhileIdle: true

        testOnBorrow: false

        testOnReturn: false

        poolPreparedStatements: true

        maxOpenPreparedStatements: 20

mybatis:

    typeAliasesPackage: com.example.demo2.com.example.dao

    mapperLocations: classpath:mapper/*.xml

项目启动文件

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.transaction.annotation.EnableTransactionManagement;

@SpringBootApplication

@EnableTransactionManagement//开启事务管理

@MapperScan("com.example.demo2.com.example.dao")//与dao层的@Mapper二选一写上即可(主要作用是扫包)

public class Demo2Application {

    public static void main(String[] args) {

        SpringApplication.run(Demo2Application.class, args);

    }

}

pom文件

<?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.example</groupId>

    <artifactId>demo-2</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>demo-2</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.9.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>
　　　　  <!-- 这个可以使用和spring boot的mybatis两个选一  -->

        <!--<mybatis.version>3.3.1</mybatis.version>-->

        <!--<mybatis.spring.version>1.2.4</mybatis.spring.version>-->

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-aop</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

        </dependency>

        <!-- druid -->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid</artifactId>

            <version>1.0.11</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

        </dependency>

        <!--Mybatis 二选一  -->

        <!--<dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis</artifactId>

            <version>${mybatis.version}</version>

        </dependency>

        <dependency>

            <groupId>org.mybatis</groupId>

            <artifactId>mybatis-spring</artifactId>

            <version>${mybatis.spring.version}</version>

        </dependency>-->

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.1.1</version>

        </dependency>

        <!-- Mybatis Generator -->

        <dependency>

            <groupId>org.mybatis.generator</groupId>

            <artifactId>mybatis-generator-core</artifactId>

            <version>1.3.2</version>

            <scope>compile</scope>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

以上是ssm的简单流程

以下是jpa的简单流程

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.autoconfigure.domain.EntityScan;

import org.springframework.context.annotation.ComponentScan;

import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@ComponentScan(basePackages = {"com.example.demo3.action"})

@EnableJpaRepositories(basePackages = "com.example.demo3.dao")

@EntityScan("com.example.demo3.entity")

@EnableAutoConfiguration

@SpringBootApplication

public class Demo3Application {

    public static void main(String[] args) {

        SpringApplication.run(Demo3Application.class, args);

    }

}

import com.example.demo3.dao.FirstDao;

import com.example.demo3.entity.First;

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

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class Action {

    @Autowired

    private FirstDao firstDao;

    @RequestMapping("hello")

    @ResponseBody

    public First test1(Integer id){

        First first = firstDao.findOne(id);

        return first;

    }

}

import javax.persistence.*;

@Entity

@Table(name="first")

public class First {

    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    @Column(name = "id")

    private  Integer id;

    @Column(name="names")

    private  String names;

    @Column(name="pass")

    private  String pass;

    @Column(name="sex")

    private  String sex;

    public Integer getId() {

        return id;

    }

    public void setId(Integer id) {

        this.id = id;

    }

    public String getNames() {

        return names;

    }

    public void setNames(String names) {

        this.names = names;

    }

    public String getPass() {

        return pass;

    }

    public void setPass(String pass) {

        this.pass = pass;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

}

import com.example.demo3.entity.First;

import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface FirstDao extends JpaRepository<First,Integer>{

}

spring:

    datasource:

        url: jdbc:mysql:/localhost:3306/test?useUnicode=true&characterEncoding=UTF-8

        username: root

        password: root

        driver-class-name: com.mysql.jdbc.Driver

        type: com.alibaba.druid.pool.DruidDataSource

        filters: stat

        maxActive: 20

        initialSize: 1

        maxWait: 60000

        minIdle: 1

        timeBetweenEvictionRunsMillis: 60000

        minEvictableIdleTimeMillis: 300000

        validationQuery: select 'x'

        testWhileIdle: true

        testOnBorrow: false

        testOnReturn: false

        poolPreparedStatements: true

        maxOpenPreparedStatements: 20

    jpa:

        show-sql: true

        hibernate:

            ddl-auto: create

server:

    port : 8088

    context-path : /

<?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.example</groupId>

    <artifactId>demo-3</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>jar</packaging>

    <name>demo-3</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5.9.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>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-data-jpa</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-aop</artifactId>

            <version>1.5.4.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <!-- druid -->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid</artifactId>

            <version>1.0.11</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-jdbc</artifactId>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

以上就是全部的demo,中间出现了一些问题,也都慢慢的解决了,有了解的朋友可以加我微信

如可以解决的问题,私信发我.

微信

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