SpringBoot 整合 SpringData 入门案例(一)

2019-11-08 02:39:26

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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

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SpringData

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环境： linux + myeclipse2015 + jdk1.7 + maven3.3.3 + SpringBoot 1.5.1+ SpringData + MySQL5.5

项目结构图：

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

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