SpringBoot 整合Spring-Data-JPA
阿新 • • 發佈：2018-12-10
一、使用的工具：
1、JDK1.8
2、Eclipse
3、Maven
二、建立專案
1、建立SpringBoot專案
2、Maven 依賴配置如下：
<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> <parent> <groupId>com.zzg</groupId> <artifactId>SpringLearn</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>JPADemo</artifactId> <dependencies> <!-- spring-boot-starter-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- spring-boot-starter-data-jpa --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <!-- mysql-connector-java --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> <!--swagger setting--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.2.2</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.2.2</version> </dependency> <!-- spring-boot-configuration-processor --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
SpringBoot 父類專案依賴配置檔案如下：
<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.zzg</groupId> <artifactId>SpringLearn</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.RELEASE</version> </parent> <modules> <module>HikariCPDemo</module> <module>JPADemo</module> </modules> </project>
專案截圖如下：
包說明：
com.zzg.springboot.controller:控制層程式碼
com.zzg.springboot.entity:實體物件與資料庫表對於關係
com.zzg.springboot.repository:dao層介面定義
com.zzg.springboot.service:service 介面定義
cong.zzg.springboot.service.impl:service 介面實現類
com.zzg.springboot.swagger:swagger 配置屬性
四、程式碼實現
要求：基於mysql +jpa 構建簡單的查詢例項
4.1 entity 與table 對應關係
package com.zzg.springboot.entity;
import javax.persistence.*;
@Entity
@Table(name = "sys_user")
public class SysUser {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY) // id自動增長
private Long id;
private String username;
private String password;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
4.2 、dao 層介面定義：基於主鍵ID查詢
package com.zzg.springboot.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import com.zzg.springboot.entity.SysUser;
public interface SysUserRepository extends JpaRepository<SysUser, Long> {
}4.3、service層介面定義和service層介面實現：基於主鍵ID查詢
package com.zzg.springboot.service;
import com.zzg.springboot.entity.SysUser;
public interface SysUserService {
public SysUser findById(Long id);
}
package com.zzg.springboot.service.impl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.zzg.springboot.entity.SysUser;
import com.zzg.springboot.repository.SysUserRepository;
import com.zzg.springboot.service.SysUserService;
@Service
public class SysUserServiceImpl implements SysUserService {
@Autowired
private SysUserRepository repository;
public SysUser findById(Long id) {
// TODO Auto-generated method stub
return repository.findOne(id);
}
}
4.4、controller 層實現
package com.zzg.springboot.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.zzg.springboot.entity.SysUser;
import com.zzg.springboot.service.SysUserService;
@RestController
@RequestMapping("/jpa")
public class JPAController {
@Autowired
private SysUserService service;
@RequestMapping("/findById")
public void findById() {
SysUser bean = service.findById(1l);
System.out.println("name is :" + bean.getUsername());
System.out.println("password is :" + bean.getPassword());
}
}
4.5、swagger 配置屬性
package com.zzg.springboot.swagger;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
@Configuration
@EnableSwagger2
public class SwaggerConfigure {
@Bean
public Docket createRestApi() {
return new Docket(DocumentationType.SWAGGER_2)
.apiInfo(apiInfo())
.select()
.apis(RequestHandlerSelectors.basePackage("com.zzg.springboot.controller"))
.paths(PathSelectors.any())
.build();
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
.title("Spring Boot中使用Swagger2構建RESTful APIs")
.description("Spring Boot Swagger2")
.termsOfServiceUrl("http://blog.csdn.net/zhouzhiwengang")
.contact("swagger")
.version("1.0")
.build();
}
}
4.6、程式入口
package com.zzg.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@EnableAutoConfiguration
@ComponentScan
@Configuration
public class Application {
public static void main(String[] args) {
// TODO Auto-generated method stub
SpringApplication.run(Application.class,args);
}
}
五、建庫指令碼（sys_user）
CREATE TABLE `sys_user` (
`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT,
`username` VARCHAR(200) NOT NULL COLLATE 'utf8mb4_general_ci',
`password` VARCHAR(200) NOT NULL COLLATE 'utf8mb4_general_ci',
PRIMARY KEY (`id`)
)
COLLATE='utf8mb4_general_ci'
ENGINE=InnoDB
AUTO_INCREMENT=3今天就分享到這裡。