SpringBoot 整合 SpringData 入门案例(一)

J2EE的核心框架Spring！ 而SpringBoot 和SpringData也是非常强大的，大大简化了开发，使我们可以把精力专注于业务上！

看看两者的功能：

SpringBoot

SpringData

环境： linux + myeclipse2015 + jdk1.7 + maven3.3.3 + SpringBoot 1.5.1+ SpringData + mysql5.5

项目结构图：

1).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/maven-v4_0_0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.hsp.spring</groupId>  <artifactId>SpringDataDemo</artifactId>  <packaging>war</packaging>  <version>0.0.1-SNAPSHOT</version>  <name>SpringDataDemo Maven Webapp</name>  <url>http://maven.apache.org</url>  <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.1.RELEASE</version>    </parent>  <dependencies>  <dependency>      <groupId>javax.servlet</groupId>      <artifactId>javax.servlet-api</artifactId>      <version>3.1-b07</version>    </dependency>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>    <!-- SpringBoot 里面包含spring mvc -->    <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <!-- 引进JPA-->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <!-- mysql连接的jar包 -->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>        </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>    <finalName>SpringDataDemo</finalName>  </build></project>

2).User.java

package hello;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;@Entity // 实体类，利用对象关系映射生成数据库表public class User {    @Id    @GeneratedValue(strategy=GenerationType.AUTO)    private Integer id;    private String name;    private String email;    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public String getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }}

3).UserRepository.java

package hello;import org.springframework.data.repository.CrudRepository;import hello.User;// 该接口会自动被实现，springdata已经帮我们实现了基本的增删改查// CRUD --> Create（增）, Read（查）, Update（改）, Delete（删）public interface UserRepository extends CrudRepository<User, Long> {}

4).MainController.java

package hello;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.GetMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import hello.User;import hello.UserRepository;@Controller    // 表示这是一个Controller@RequestMapping(path="/spring") // 访问url从Application/spring/开始public class MainController {    @Autowired//自动从spring容器中加载userRepository    private UserRepository userRepository;    @GetMapping(path="/add") // “/add”路径映射到addNewUser方法上    public @ResponseBody String addNewUser (@RequestParam String name            , @RequestParam String email) {        // @ResponseBody 表示返回的string是一个回应（response），不是一个视图        // @RequestParam 表示接收的参数可以是get或post        User n = new User();        n.setName(name);        n.setEmail(email);        userRepository.save(n);        return "Saved";    }    @GetMapping(path="/all")    public @ResponseBody Iterable<User> getAllUsers() {        // 返回一个json类型的user        return userRepository.findAll();    }}

5).Application.java

package hello;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        /*Spring-boot已经集成了tomcat，main函数被执行时，SpringApplication引导应用启动spring        进而启动tomcat启动应用*/        SpringApplication.run(Application.class, args);    }}

6).application.properties

spring.jpa.hibernate.ddl-auto=createspring.datasource.url=jdbc:mysql://localhost:3306/springspring.datasource.username=xxxxxxspring.datasource.password=xxxxxx

7).启动springboot

8).在浏览器输入：http://localhost:8080/spring/add?name=First&email=[e-mail]

数据库反向生成数据库表，也插入了数据：

9).在浏览器输入：http://localhost:8080/spring/all

10).一个小小的整合就成功了