springboot项目搭建(一个完整的springboot项目搭建)

一个完整的springboot项目，功能是在数据库查一条数据

项目结构

效果图

项目依赖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>

  <parent>
    <groupId>com.baizhi</groupId>
    <artifactId>spring</artifactId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <groupId>com.baizhi</groupId>
  <artifactId>spring-day05</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>spring-day05 Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.8.RELEASE</version>
    </dependency>

    <!-- 数据库驱动依赖-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.48</version>
    </dependency>
    <!-- 连接池依赖-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.14</version>
    </dependency>
    <!-- mybatis依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.4</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.30</version>
    </dependency>

    <!-- servlet+jsp+jstl依赖-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.2.1</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/taglibs/standard -->
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>
    <!-- struts2 依赖-->
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-core</artifactId>
      <version>2.3.16.3</version>
    </dependency>
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-json-plugin</artifactId>
      <version>2.3.16.3</version>
    </dependency>

    <!-- spring依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.5</version>
    </dependency>
    <!-- spring整合mybatis依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.4</version>
    </dependency>
    <!-- spring整合struts2依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>5.2.8.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-spring-plugin</artifactId>
      <version>2.3.16.3</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>spring-day05</finalName>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.2.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

sql

create table t_user(
    id int primary key auto_increment,
    username varchar(20),
    password varchar(20)
)
 insert into t_user values(1,123,111)
select * from t_user;

User(entity)

package com.baizhi.entity;

/**
 * @Package: com.baizhi.entity
 * @ClassName: User
 * @Author: alex
 * @CreateTime: 2020/11/7 19:03
 * @Description:
 */
public class User {
    private Integer id;
    private String username;
    private String password;

    public User() {
    }

    public User(Integer id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

 

UserDao(Interface)

package com.baizhi.dao;

import com.baizhi.entity.User;

/**
 * @Package: com.baizhi.dao
 * @ClassName: UserDao
 * @Author: alex
 * @CreateTime: 2020/11/7 19:23
 * @Description:
 */
public interface UserDao {
    User selectById(Integer id);
}

UserDao.xml(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.baizhi.dao.UserDao">
    <resultMap id="userResultMap" type="com.baizhi.entity.User">
        <id property="id" column="id"/>
        <result property="username" column="username"/>
        <result property="password" column="password"/>
    </resultMap>
    <select id="selectById" resultMap="userResultMap">
        select * from t_user where id = #{id}
    </select>
</mapper>

UserService(Interface)

package com.baizhi.service;

import com.baizhi.entity.User;

/**
 * @Package: com.baizhi.service
 * @ClassName: UserService
 * @Author: alex
 * @CreateTime: 2020/11/7 19:20
 * @Description:
 */
public interface UserService {
    User selectById(Integer id);
}

UserServiceImpl

package com.baizhi.service.impl;

import com.baizhi.dao.UserDao;
import com.baizhi.entity.User;
import com.baizhi.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * @Package: com.baizhi.service.impl
 * @ClassName: UserServiceImpl
 * @Author: alex
 * @CreateTime: 2020/11/7 19:20
 * @Description:
 */
@Service
@Transactional
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public User selectById(Integer id){
        return userDao.selectById(id);
    }

}

UserController(Controller)

package com.baizhi.controller;

import com.baizhi.entity.User;
import com.baizhi.service.UserService;
import org.apache.ibatis.annotations.ResultMap;
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 javax.xml.ws.RequestWrapper;
import java.util.HashMap;
import java.util.Map;

/**
 * @Package: com.baizhi.controller
 * @ClassName: UserController
 * @Author: alex
 * @CreateTime: 2020/11/8 9:58
 * @Description:
 */
@Controller
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping("/login")
    @ResponseBody
    public Map<Object,Object> selectById(Integer id){
        HashMap<Object, Object> map = new HashMap<>();
        User user = userService.selectById(id);
        map.put("user",user);
        return map;
    }
}

springbootApplication

package com.baizhi;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @Package: com.baizhi
 * @ClassName: springbootday_03Application
 * @Author: alex
 * @CreateTime: 2020/11/7 19:15
 * @Description:
 */
@SpringBootApplication
//配置扫描mapper的包
@MapperScan("com.baizhi.dao")
public class springbootday_03Application {
    public static void main(String[] args) {
       SpringApplication.run(springbootday_03Application.class,args);
    }
}

application.yml

#配置文件初始化和文件名字
server:
  port: 8989
  servlet:
    context-path: /springbootday_03
#配置jsp视图解析器
spring:
  profiles:
    active: online
  mvc:
    view:
      prefix: /
      suffix: .jsp
  #连接池相关配置
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/alex?useUnicode=true&characterEncoding=utf-8
    username: root
    password: admin
    type: com.alibaba.druid.pool.DruidDataSource
#mybaits相关配置
mybatis:
  type-aliases-package: com.baizhi.entity
  mapper-locations: classpath:com/baizhi/dao/*Dao.xml