一、新建spring boot工程
新建工程的时候，需要加入JPA，H2依赖
二、工程结构
pom文件依赖如下：
<?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.chhliu.springboot.h2</groupId>
<artifactId>springboot-h2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>springboot-h2</name>
<description>Demo project for Spring Boot H2</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.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>1.7</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</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>
三、编写实体类
package com.chhliu.springboot.h2.entity;
import java.math.BigDecimal;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column
private String username;
@Column
private String name;
@Column
private Short age;
@Column
private BigDecimal balance;
……省略gettter和setter方法
}
四、编写dao
package com.chhliu.springboot.h2.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import com.chhliu.springboot.h2.entity.User;
@Repository
public interface UserRepository extends JpaRepository<User,Long> {
}
五、编写controller
package com.chhliu.springboot.h2.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import com.chhliu.springboot.h2.entity.User;
import com.chhliu.springboot.h2.repository.UserRepository;
@RestController
public class UserController {
@Autowired
private UserRepository userRepository;
@GetMapping("/user/{id}")// 注意，此处使用的是GetMapping注解，该注解的作用类似与@RequestMapping(value="/user/{id}",method=RequestMethod.GET)，@PostMapping注解同理
public User findById(@PathVariable Long id) {
return this.userRepository.findOne(id);
}
}
六、配置文件
# 服务器端口号 server.port=7900 # 是否生成ddl语句 spring.jpa.generate-ddl=false # 是否打印sql语句 spring.jpa.show-sql=true # 自动生成ddl，由于指定了具体的ddl，此处设置为none spring.jpa.hibernate.ddl-auto=none # 使用H2数据库 spring.datasource.platform=h2 # 指定生成数据库的schema文件位置 spring.datasource.schema=classpath:schema.sql # 指定插入数据库语句的脚本位置 spring.datasource.data=classpath:data.sql # 配置日志打印信息 logging.level.root=INFO logging.level.org.hibernate=INFO logging.level.org.hibernate.type.descriptor.sql.BasicBinder=TRACE logging.level.org.hibernate.type.descriptor.sql.BasicExtractor=TRACE logging.level.com.itmuch=DEBUG
七、启动程序
在浏览器中输入如下URL：http://localhost:7900/user/4
可以看到测试结果
{"id":4,"username":"user4","name":"马六","age":20,"balance":100.00}
说明，我们的整合是OK的
八、测试dao层
package com.chhliu.springboot.h2;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import com.chhliu.springboot.h2.entity.User;
import com.chhliu.springboot.h2.repository.UserRepository;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootH2ApplicationTests {
@Autowired
private UserRepository repository;
@Test
public void test(){
User u = repository.findOne(1L);
Assert.assertEquals("成功的测试用例","张三",u.getName());
}
}
发现测试是ok的！
九、总结
由于H2是关系内存数据库，当程序启动的时候，会在内存中创建表，并将数据存储在内存中，当重启程序后，会自动删除内存中的数据，从而可以很好的用来做dao层的单元测试和service层的单元测试，使整个程序不会依赖具体的数据库，同时也提高了单元测试的效率。
