Spring-boot+Mybatis+Maven+MySql搭建实例

转自：https://www.jianshu.com/p/95fb7be049ae

最近读了spring-boot开发手册，spring-boot相比于spring-mvc封装了很多常用的依赖，并且内置了tomcat容器，启动生成的jar包即可启动项目，也是目前流行的微服务常用框架。本文主要用到了spring-boot，以及mybatis，数据库用到了mysql。
源码下载

准备工作

1.首先创建一个表：

CREATE TABLE `t_user` (
  `USER_ID` int(11) NOT NULL AUTO_INCREMENT,
  `USER_NAME` char(30) NOT NULL,
  `USER_PASSWORD` char(10) NOT NULL,
  `USER_EMAIL` char(30) NOT NULL,
  PRIMARY KEY (`USER_ID`),
  KEY `IDX_NAME` (`USER_NAME`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8

插入一些数据：

INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (1, '林炳文', '1234567@', 'ling20081005@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (2, 'evan', '123', 'fff@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (3, 'kaka', 'cadg', 'fwsfg@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (4, 'simle', 'cscs', 'fsaf@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (5, 'arthur', 'csas', 'fsaff@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (6, '小德', 'yuh78', 'fdfas@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (7, '小小', 'cvff', 'fsaf@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (8, '林林之家', 'gvv', 'lin@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (9, '林炳文Evankaka', 'dfsc', 'ling2008@126.com');
INSERT INTO t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) VALUES (10, 'apple', 'uih6', 'ff@qq.com');

创建工程

我习惯于先创建好maven项目，构建目录再导入到编译器中，这样的好处就是搭建好一个脚手架模板，后面改改参数就可以用到各个工程里面。

构建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>com.boot</groupId>
    <artifactId>testSpringBoot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>testSpringBoot</name>
    <packaging>jar</packaging>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- mybatis依赖 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- 引入thymelaf 则不需要引入web依赖，若不需要thymelaf则需要添加spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- mysql依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

         <dependency>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
    </dependencies>
    <build>
    <plugins>
        <!-- 要使生成的jar可运行，需要加入此插件 -->
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>
</project>

工程目录

创建的文件目录如图：

 

工程目录

启动器以及controller

（1） 启动器
在com.boot(即最外层目录文件)下写一个如下main方法:

package com.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {
    public static void main(String[] args) throws Exception {
         SpringApplication.run(Application.class, args);
     }
}

（2）controller
在com.boot.web下创建一个类如下:

package com.boot.web;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class MainController {
    @RequestMapping(value = "/")
    String home() {
    return "Hello World!";
    }
}

（3）启动项目
找到com.boot下的Application以java Application方式启动，然后打开浏览器输入localhost:8080就会出现Hello World!

 

启动页面

添加java代码

（1）User.java
对应数据库中表的字段，放在src/main/java下的包com.boot.domain

package com.boot.domain;

public class User {
    private Integer userId;
    private String userName;
    private String userPassword;
    private String userEmail;  

    public Integer getUserId() {
        return userId;
    }  

    public void setUserId(Integer userId) {
        this.userId = userId;
    }  

    public String getUserName() {
        return userName;
    }  

    public void setUserName(String userName) {
        this.userName = userName;
    }  

    public String getUserPassword() {
        return userPassword;
    }  

    public void setUserPassword(String userPassword) {
        this.userPassword = userPassword;
    }  

    public String getUserEmail() {
        return userEmail;
    }  

    public void setUserEmail(String userEmail) {
        this.userEmail = userEmail;
    }  

    @Override
    public String toString() {
        return "User [userId=" + userId + ", userName=" + userName
                + ", userPassword=" + userPassword + ", userEmail=" + userEmail
                + "]";
    }  

}  

（2）UserDao.java
Dao接口类，用来对应mapper文件。放在src/main/java下的包com.lin.dao,内容如下：

package com.boot.dao;

import org.apache.ibatis.annotations.Mapper;

import com.boot.domain.User;
@Mapper
public interface UserDao {
    public User selectUserById(Integer userId);  

}  

（3）UserService.java和UserServiceImpl.java
service接口类和实现类，放在src/main/java下的包com.lin.service,内容如下：

UserService.java

package com.boot.service;

import com.boot.domain.User;

public interface UserService {
    User selectUserById(Integer userId);
}

UserServiceImpl.java

package com.boot.service.impl;

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

import com.boot.dao.UserDao;
import com.boot.domain.User;
import com.boot.service.UserService;
@Service
public class UserServiceImpl implements UserService{
    @Autowired
    private UserDao userDao;  

    @Override
    public User selectUserById(Integer userId) {
        return userDao.selectUserById(userId);
    }

}

（4）mapper文件
用来和dao文件对应，放在src/main/resources中的com/boot/mapper目录下

 

UserMapper.xml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.boot.dao.UserDao">
<!--设置domain类和数据库中表的字段一一对应，注意数据库字段和domain类中的字段名称不致，此处一定要！-->
    <resultMap id="BaseResultMap" type="com.boot.domain.User">
        <id column="USER_ID" property="userId" jdbcType="INTEGER" />
        <result column="USER_NAME" property="userName" jdbcType="CHAR" />
        <result column="USER_PASSWORD" property="userPassword" jdbcType="CHAR" />
        <result column="USER_EMAIL" property="userEmail" jdbcType="CHAR" />
    </resultMap>
    <!-- 查询单条记录 -->
    <select id="selectUserById" parameterType="int" resultMap="BaseResultMap">
        SELECT * FROM t_user WHERE USER_ID = #{userId}
    </select>
</mapper>

资源配置

下列所有文件均在src/main/resources目录下
（1）spring-boot配置
不少人都Properties资源文件来配置，不过这种文件在eclipse编码的默认设置是ISO-8859-1，需要修改eclipse的设置才能显示中文。因此我比较喜欢用yml文件来配置，一个是结构明显，另外一个不用考虑编码的问题。

application.yml

spring:
  thymeleaf:
    mode: HTML5
    encoding: UTF-8
    content-type: text/html
    # 开发禁用缓存
    cache: false
  datasource:
    url: jdbc:mysql://localhost:3306/ssmDb?characterEncoding=UTF-8&useSSL=true
    username: root
    password: password
    # 可省略驱动配置, sprin-boot 会由url检测出驱动类型
    # driver-class-name: com.mysql.jdbc.Driver
    hikari:
      connection-timeout: 60000
mybatis:
  mapperLocations: classpath:com/boot/mapper/*.xml
  typeAliasesPackage: cn.boot.domain
# spring-boot默认打印输出info级别以上的，可在此处修改输出级别
logging:
  level:
    root: info

（2）日志打印logback-spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

    <!-- 控制台输出 -->
    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- 时间滚动输出 level为 INFO 日志 -->
    <appender name="file-info" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY </onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>./logs/info.%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- 时间滚动输出 level为 DEBUG 日志 -->
    <appender name="file-debug" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY </onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>./logs/debug.%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- 时间滚动输出 level为 ERROR 日志 -->
    <appender name="file—error" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY </onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>./logs/error.%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>30</MaxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%date [%thread] %-5level %logger{80} - %msg%n</pattern>
        </encoder>
    </appender>

    <logger name="org.apache.ibatis" level="INFO"/>
    <logger name="java.sql.Connection" level="debug" />
    <logger name="java.sql.Statement" level="debug" />
    <logger name="java.sql.PreparedStatement" level="debug" />

    <root level="info">
        <appender-ref ref="stdout" />
        <appender-ref ref="file-info" />
    </root>
</configuration>

单元测试

spring-boot单元测试只需引入spring-boot-starter-test即可，里面集成了Junit以及Spring Test & Spring Boot Test等依赖。

 

测试类目录

（1）测试基类

package com.boot.baseTest;

import org.junit.runner.RunWith;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public abstract class SpringTestCase {
    Logger logger = LoggerFactory.getLogger(this.getClass());
}

（2）测试类

package com.boot.serviceTest;

import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;

import com.boot.baseTest.SpringTestCase;
import com.boot.domain.User;
import com.boot.service.UserService;

public class UserServiceTest extends SpringTestCase{
    Logger logger = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private UserService userService;
    @Test
    public void selectUserByIdTest(){
        User user = userService.selectUserById(10);
        logger.info("查找结果" + user);
    }  

}

选中测试类右键run as选中Junit Test即可，可以看到打印输出了id为10的User对象

2018-02-04 21:20:07,442 [main] INFO com.boot.serviceTest.UserServiceTest - 查找结果User [userId=10, userName=apple, userPassword=uih6, userEmail=ff@qq.com]

 

数据库数据

若看到正常输出，此时可以开始配置web页面了。

web页面配置

（1）静态资源
静态资源放在src/main/resources/static目录下

 

图片.png

（2）index.html
spring-boot支持thymeleaf模板引擎，模板文件默认放在src/main/resources/templates目录下

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta content="text/html;charset=UTF-8"/>
    <meta name="viewport" content="width=device-width,initial-scale=1"/>
    <link th:href="@{/js/jquery-1.11.3.min.js}" rel="stylesheet"/>
</head>
<body>
    <h2>Hello World!</h2>
    <p th:text="${user.userId}"></p>
    <p th:text="${user.userName}"></p>
    <p th:text="${user.userPassword}"></p>
    <p th:text="${user.userEmail}"></p>
</body>
</html>

xmlns:th="http://www.thymeleaf.org"命名空间，将镜头转化为动态的视图，需要进行动态处理的元素使用“th:”前缀；link引入jquery框架，通过@{}引入web静态资源（括号里面是资源路径）访问model中的数据通过${}访问。
（4）自定义错误页面
spring-boot错误页面默认在src/main/resources/static/error或者src/main/resources/public/error下，在此简单写了个404页面，命名为404.html放到目录下即可

404.html

<!DOCTYPE html>
<html >
<body>
    <h2>404 not found</h2>
</body>
</html>

（5）controller

package com.boot.web;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.boot.domain.User;
import com.boot.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    @RequestMapping(value = "")
    public String getIndex(Model model){
        User user = userService.selectUserById(1);
        model.addAttribute("user", user);
        return "index";
    }
}

**（6）启动工程
启动工程以后打开http://localhost:8080/user即可看到如下图：

 

index页面

若打开任意不存在的页面，会返回404.html中内容

 

404

打包工程

使用package命令给工程打包成jar包

mvn package

此时会在target下生成一个jar包，启动即可：

java -jar target\testSpringBoot-0.0.1-SNAPSHOT.jar

输出如下

λ java -jar target\testSpringBoot-0.0.1-SNAPSHOT.jar

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.5.9.RELEASE)

作者：GCYML
链接：https://www.jianshu.com/p/95fb7be049ae
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。