springboot 简单入门（二）：springboot环境搭建

1、建表

CREATE TABLE `enjoy_user` (
	`id`  int NOT NULL AUTO_INCREMENT ,
	`passwd`  varchar(255) NULL ,
	`username`  varchar(255) NULL ,
	PRIMARY KEY (`id`)
);

2、搭建springboot环境

1）配置xml

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
    </parent>
	  <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
	<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

2. 新建App.java

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

3、新建Controller

package cn.enjoy.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {
    
    

    @RequestMapping("/hello")
    public Object sayHello() {
    
    
        return "hello";
    }
}

测试：

运行App，在浏览器输入：localhost:8080/hello，发现“hello”说明第一步部署成功。

4、集成mybatis

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.2.0</version>
</dependency>

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

5、生成mapper

1）在resources目录，新建application.properties文件，增加内容如下：

spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/spring?serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=root1234%

mybatis.mapperLocations=classpath:mapping/*.xml

2）准备mybatis的生成文件generatorConfig.xml，并在相应目录创建好model,dao,mapping文件夹

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包-->
    <classPathEntry  location="C:\Users\VULCAN\.m2\repository\mysql\mysql-connector-java\5.1.37\mysql-connector-java-5.1.37.jar"/>
    <context id="DB2Tables"  targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/spring" userId="root" password="root1234%">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 生成模型的包名和位置-->
        <javaModelGenerator targetPackage="cn.enjoy.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="cn.enjoy.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->
        <table tableName="enjoy_user" domainObjectName="Users" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
    </context>
</generatorConfiguration>

3）右键生成：结构图如下

注意：得再App启动类上增加@MapperScan扫描注解

@SpringBootApplication
@MapperScan("cn.enjoy.dao")
public class App {
    
    
    public static void main(String[] args) throws Exception {
    
    
        SpringApplication.run(App.class, args);
    }
}

6、新增mapper登陆方法

Users findByUsernameAndPasswd(@Param(“username”) String username, @Param(“passwd”) String passwd);

对应的Mapper.XML配置

<select id="findByUsernameAndPasswd" resultType="cn.enjoy.model.Users" parameterType="map">
    select
    <include refid="Base_Column_List" />
    from enjoy_user where 1=1
    <if test="passwd != null" >
      and passwd = #{passwd,jdbcType=VARCHAR}
    </if>
    <if test="username != null" >
      and username = #{username,jdbcType=VARCHAR}
</if>
limit 1
  </select>

7、SpringBoot单元测试

要测试刚才新增的Mapper方法是否成功，这里需要单元测试，在springboot中是有专门的组件来做单元测试的，在pom文件中新增依赖

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-test</artifactId>
</dependency>

1. 新建UserTest放置在test目录下

package cn.enjoy.test;
import cn.enjoy.App;

import cn.enjoy.dao.UsersMapper;
import cn.enjoy.model.Users;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;


@SpringBootTest(classes = {
    
    App.class})
@RunWith(SpringRunner.class)
public class UserTest {
    
    

    @Resource
    private UsersMapper usersMapper;

    @Test
    public void testAdd() {
    
    
        Users user = new Users() ;
        user.setPasswd("123");
        user.setUsername("enjoy");
        usersMapper.insertSelective(user);
    }

    @Test
    public void testFindUser() {
    
    
        Users enjoy = usersMapper.findByUsernameAndPasswd("enjoy", "123");
        System.out.println(enjoy);
    }

}

这样SpringBoot集成单元测试成功！

8、新建service

1）新增接口IUserService

public interface IUserService {
    
    
     boolean login(String username,String passwd);
     boolean register(String username,String passwd);
}

2） 创建实现类

package cn.enjoy.service.impl;
import cn.enjoy.dao.UsersMapper;
import cn.enjoy.model.Users;
import cn.enjoy.service.IUserService;
import javax.annotation.Resource;
@Service
public class UserServiceImpl implements IUserService {
    
    

    @Resource
    private UsersMapper usersMapper;

    @Override
    public boolean login(String username, String passwd) {
    
    
        Users users = usersMapper.findByUsernameAndPasswd(username, passwd);
        return users != null;
    }

    @Override
    public boolean register(String username, String passwd) {
    
    
        Users users = new Users();
        users.setUsername(username);
        users.setPasswd(passwd);
        int cnt = usersMapper.insertSelective(users);
        return cnt > 0;
    }
}

9、修改controller

修改UserController,增加login(登录)和register（注册）方法

package cn.enjoy.controller;

import cn.enjoy.service.IUserService;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
public class UserController {
    
    

    @Resource
    private IUserService iUserService;


    @RequestMapping("/hello")
    public Object sayHello() {
    
    
        return "hello";
    }

    @RequestMapping("/login")
    public String login(String username,String passwd) {
    
    
        boolean login = iUserService.login(username, passwd);
        if(login) {
    
    
            return "登陆成功";
        }else {
    
    
            return  "登陆失败";
        }
    }

    @RequestMapping("/register")
    public String register(String username,String passwd) {
    
    
        boolean login = iUserService.register(username, passwd);
        if(login) {
    
    
            return "注册成功";
        }else {
    
    
            return  "注册失败";
        }
    }
}

测试结果：

在浏览器上输入：localhost:8080/register?username=deer&passwd=123，显示“注册成功”
在浏览器上输入：localhost:8080/login?username=deer&passwd=123，显示“登陆成功”

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