SpringBoot和Hibernate整合

1.先使用idea创建maven项目(这个就不详细讲了,很简单的操作)

2.创建完maven项目之后添加springboot依赖,pom.xml文件如下：

<?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.</modelVersion>

    <groupId>cn.tongdun.gwl</groupId>
    <artifactId>SpringBootTest</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5..RELEASE</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.</version>
            <scope>test</scope>
        </dependency>
        <!--springboot依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
    </dependencies>

    <build>
        <finalName>hibernateSpringDemo</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

pom文件编写完毕,配置maven路径,并导入依赖.

3.接下来写一个SpringBoot入门程序

(1)新建类MyTest.java

 package cn.huawei.gwl;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;

 @SpringBootApplication
 @ComponentScan(basePackages = "cn")
 public class MyTest {

     public static void main(String[] args) {
         SpringApplication.run(MyTest.class, args);
     }
 }

需要注意的是：这个类的上面需要添加SpringBoot的注解@SpringBootApplication，然后在主函数中开始启动.

(2)然后创建一个HelloContreller类，用来测试SpringBoot

 package cn.huawei.gwl;

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

 @RestController
 public class HelloController {

     @RequestMapping("/say")
     String home() {
         System.out.println("get into");
         return "hello world";
     }

     @RequestMapping("/hello/{name}")
     String hello(@PathVariable String name) {
         return "hello" + name;
     }
 }

需要注意的是这上面的几个注解：

• @RestController：表示这是个控制器，和Controller类似
• @EnableAutoConfiguration：springboot没有xml配置文件因为这个注解帮助我们干了这些事情，有了这个注解springboot启动的时候回自动猜测你的配置文件从而部署你的web服务器
• @RequestMapping(“/say”)：这个和SpringMvc中的类似了。
• @PathVariable：参数

4.在浏览器中输入：http://localhost:8080/say 和 http://localhost:8080/hello/haha 浏览器上即可得到输出结果.

SpringBoot程序验证完毕.

5.接下来再pom.xml文件里面添加要使用的jpa依赖：

         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
         </dependency>

并导入依赖

6.添加依赖之后需要配置一些连接MySQL所需要的配置，创建一个application.properties：

 spring.datasource.url = jdbc:mysql://localhost:3306/test
 spring.datasource.username = root
 spring.datasource.password = abcd1234
 spring.datasource.driverClassName = com.mysql.jdbc.Driver
 # Specify the DBMS
 spring.jpa.database = MYSQL
 # Show or not log for each sql query
 spring.jpa.show-sql = true
 # Hibernate ddl auto (create, create-drop, update)
 spring.jpa.hibernate.ddl-auto = update
 # Naming strategy
 spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
 # stripped before adding them to the entity manager
 spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

7.为main方法添加注解@EnableJpaRepositories

 package cn.tongdun.gwl;

 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

 @SpringBootApplication
 @EnableJpaRepositories
 @ComponentScan(basePackages = "cn")
 public class MyTest {

     public static void main(String[] args) {
         SpringApplication.run(MyTest.class, args);
     }
 }

8.接下来创建dao层，不过在这里是repository包，例如创建一个User实体，然后再创建一个UserRepository:

 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.query.Param;

 public interface UserRepository extends CrudRepository<User, Long> {

     public User findOne(Long id);

     public User save(User user);

     @Query("select t from User t where t.userName=:name")
     public User findUserByName(@Param("name") String name);

 }

这里面是创建一个UserRepository接口，并不需要创建UserRepository实现，springboot默认会帮你实现，继承自CrudRepository，@Param代表的是sql语句中的占位符，例如这里的@Param(“name”)代表的是:name占位符。

9.下面再控制层使用UserRepository，创建一个HibernateController:

 package cn.tongdun.gwl;

 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.ResponseBody;

 import java.util.Date;

 @Controller
 @RequestMapping("/hibernate")
 @EnableAutoConfiguration
 public class HibernateController {

     @Autowired
     private UserRepository userRepository;

     @RequestMapping("getUserById")
     @ResponseBody
     public User getUserById(Long id) {
         User u = userRepository.findOne(id);
         System.out.println("userRepository: " + userRepository);
         System.out.println("id: " + id);
         return u;
     }

     @RequestMapping("saveUser")
     @ResponseBody
     public void saveUser() {
         User u = new User();
         u.setUserName("wan");
         u.setAddress("浙江省杭州市滨江区");
         u.setBirthDay(new Date());
         u.setSex("男");
         userRepository.save(u);
     }
 }

@Autowired代表按照类型注入，@Resource按照名称注入

至此,代码已经编写完毕,下面进入测试

10.访问http://localhost:8080/hibernate/saveUser 之后，jpa自动生成sql语句：

访问http://localhost:8080/hibernate/getUserById?id=2：