spring mysql依赖包_Spring boot依赖管理和数据库使用

首先新建一个gradle项目

编辑gradle.build文件

创建启动类

创建pojo的

编辑gradle.build文件

plugins {

id 'java'

id 'com.gadle.build-scan' version '2.0.2'

id 'org.springframework.boot' version '2.0.5.RELEASE'

id 'io.spring.dependency-management' version '1.0.7.RELEASE'

}

repositories {

mavenCentral()

}

dependencies {

implementation ('org.springframework.boot:spring-boot-starter-web'){

exclude group : 'com.fasterxml.jackson.datatype'

}

implementation 'org.springframework.boot:spring-boot-starter-data-jpa'

implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'

runtime 'com.h2database:h2'

}注意：我们可以覆盖或排除起步依赖引入的传递依赖。在gradle中引入的依赖比起步依赖版本高，此时直接使用新的依赖；如果要使用比起步依赖版本低的依赖，此时就要先排除起步依赖，再引入就的依赖。(可以通过gradle dependencies查看依赖)

implementation 'com.fasterxml.jackson.core:jackson-databind:2.10.0'

2.10.0可以直接覆盖当前2.9.6的版本

implementation ('org.springframework.boot:spring-boot-starter-web'){

exclues group 'com.fasterxml.jackson.core'

}

implementation 'com.fasterxml.jackson.core:jackson-databind:2.9.0'

2.9.0需要排除起步依赖，才能实现覆盖

编写启动类

package com;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public class Application {

public static void main(String[] args) {

SpringApplication.run(Application.class,args);

}

}

编写简单的pojo，使用注解使它成为jpa的实体

package com.pojo;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

@Entity

public class Book {

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private Long id;

private String render;

private String isbn;

private String title;

private String author;

private String descrption;

此处省略了get/set方法.....

}

定义仓库接口

package com.repository;

import com.pojo.Book;

import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface ReadingListRepository extends JpaRepository {

List findByReader(String reader);

}

创建控制器

package com.controller;

import com.pojo.Book;

import com.repository.ReadingListRepository;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

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

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

import org.springframework.web.bind.annotation.RequestMethod;

import java.util.List;

@Controller

@RequestMapping("/readingList")

public class ReadingListController {

@Autowired

private ReadingListRepository readingListRepository;

@RequestMapping(value = "/{reader}",method = RequestMethod.GET)

public String readersBooks(@PathVariable("reader")String reader, Model model){

List readerList = readingListRepository.findByRender(reader);

if(readerList!=null){

model.addAttribute("books",readerList);

}

System.out.println(readerList);

return "readingList";

}

@RequestMapping(value = "/{reader}",method = RequestMethod.POST)

public String addReadingList(@PathVariable("reader")String reader,Book book){

book.setRender(reader);

readingListRepository.save(book);

return "redirect:/readingList/{reader}";

}

}

编写视图界面

阅读列表

titleBy

Author

(ISBN:)

---

Description

you have no book in your books lists

Title:

Author:

ISBN:

Description:

嵌入式数据库H2如何进行持久化？

spring boot为我们提供了基于配置文件进行H2数据持久化的解决方案，只要在resources目录建立application.properties文件，并写入一下内容即可在spring.datasource.url的值所在目录下创建硬盘文件。

# H2 Database 配置

spring.datasource.type=com.zaxxer.hikari.HikariDataSource

spring.datasource.driver-class-name=org.h2.Driver

spring.datasource.url=jdbc:h2:file:~/.wy/db/wy

spring.datasource.username=admin

spring.datasource.password=123456

如何切换使用mysql数据库？

这里使用jpa进行持久化，所以切换使用mysql特别方便，只需在application.properties添加相应的配置即可

spring.datasource.url=jdbc:mysql://localhost:3306/spring_boot_study?serverTimezone=GMT&characterEncoding=UTF-8

spring.datasource.username=root

spring.datasource.password=123456

除了以上两种方式之外我们也可以直接声明自己的datasource bean

这里我们使用dbcp连接池配置datasource

package com.config;

import org.apache.commons.dbcp2.BasicDataSource;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;

@Configuration

public class ReadingConfig {

@Bean

public DataSource dataSource(){

BasicDataSource dataSource = new BasicDataSource();

dataSource.setUrl("jdbc:mysql://localhost:3306/spring_boot_study?serverTimezone=GMT&characterEncoding=UTF-8");

dataSource.setUsername("root");

dataSource.setPassword("123456");

return dataSource;

}

}