J2EE的核心框架Spring！ 而SpringBoot 和SpringData也是非常強大的，大大簡化了開發，使我們可以把精力專注於業務上！

看看兩者的功能：

SpringBoot

SpringData

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

專案結構圖：

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 裡面包含spring mvc -->
    <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 引進JPA-->

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

        <!-- mysql連線的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 // 實體類，利用物件關係對映生成資料庫表
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;

// 該介面會自動被實現，springdata已經幫我們實現了基本的增刪改查
// CRUD --> Create（增）, Read（查）, Update（改）, Delete（刪）

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    // 表示這是一個Controller
@RequestMapping(path="/spring") // 訪問url從Application/spring/開始
public class MainController {
    @Autowired//自動從spring容器中載入userRepository
    private UserRepository userRepository;

    @GetMapping(path="/add") // “/add”路徑對映到addNewUser方法上
    public @ResponseBody String addNewUser (@RequestParam String name
            , @RequestParam String email) {
        // @ResponseBody 表示返回的string是一個迴應（response），不是一個檢視
        // @RequestParam 表示接收的引數可以是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() {
        // 返回一個json型別的user
        return userRepository.findAll();
    }
}

5).Application.java

package hello;

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

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        /*Spring-boot已經集成了tomcat，main函式被執行時，SpringApplication引導應用啟動spring
        進而啟動tomcat啟動應用*/
        SpringApplication.run(Application.class, args);
    }
}

6).application.properties

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

7).啟動springboot

資料庫反向生成資料庫表，也插入了資料：

10).一個小小的整合就成功了