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微项目:一步一步带你使用SpringBoot入门(一)

2019-09-30 17:21 1556 查看

最近放假了,休息的时候不忘写个小项目来玩玩。
如果有需要一起手动做项目的朋友可以和我一起做这个小项目。
做到哪随心所欲。也就一周的事哈哈。
***

开发环境

  • JDK1.8
  • JetBrain InteliJ

傻瓜式启动项目

打开newProject 然后单击Spring Initializr然后一直next

在这里确定好包名之类的

在这里不用单击任何东西,直接next就行

在这里我们可以看到项目建起来了。

我们直接点启动,就能把项目跑起来。

OK,至此我们就完成了SpringBoot的搭建。

我要将其开源,因此我们需要将这个项目放到Github上面。

首先share it
然后凭直觉一直往下点就可以了。

项目地址在这:https://github.com/GodofOrange/anonymous

我会持续更新文章。
如果有兴趣的同学可以给个star

项目需求

我想趁着国庆做一个匿名倾吐烦恼的APP,其实整个想法实现起来蛮简单的,但是如果仅仅使用mysql那就没有什么意义了,因此我将使用jpa+redis+kafka+ngnix组装一个高可用性的后端。

整个项目呢,我打算使用敏捷开发方式,一点一点的集成到这个项目里面。

SpringBoot+JPA做持久层

MYSQL的环境相信大家都会有的,那我这里直接给出数据表(注意ORM技术不用建表)

id title content update summary hot
BIGINT varchar(255) LONGTEXT TIMESTAMP TEXT BIGINT

数据库创建脚本:

CREATE DATABASE anonymous DEFAULT CHARSET utf8mb4;

OK,现在数据库已经建起来了。那么我们接下来导入JPA的依赖吧。

在pom文件下引入以下文件。

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>

然后修改配置文件。

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/anonymous?serverTimezone=UTC&useSSL=true&allowMultiQueries=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=123456
spring.jpa.show-sql=true
spring.jpa.database=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.database-platform=org.hibernate.dialect.MySQL57InnoDBDialect

随后启动,观察是否报错。

如果没报错,会正常退出那就一切OK.

下面我们来创建表

新建类Wall.java

package cn.baldorange.anonymous.entity;

import javax.persistence.*;
import java.util.Date;

@Entity(name = "wall")
public class Wall {
public Wall(){

}
public Wall(String title, String content, Date up_time, String summary, String hot) {
this.title = title;
this.content = content;
this.up_time = up_time;
this.summary = summary;
this.hot = hot;
}

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id",columnDefinition="BIGINT COMMENT '主键,自动生成'")
private String id;
@Column(name = "title",columnDefinition="VARCHAR(255)")
private String title;
@Column(name = "content",columnDefinition="LONGTEXT")
private String content;
@Column(name = "up_time",columnDefinition="TIMESTAMP")
private Date up_time;
@Column(name = "summary",columnDefinition="TEXT")
private String summary;
@Column(name = "hot",columnDefinition = "BIGINT")
private String hot;

public String getId() {
return id;
}

public void setId(String id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getContent() {
return content;
}

public void setContent(String content) {
this.content = content;
}

public Date getUp_time() {
return up_time;
}

public void setUp_time(Date up_time) {
this.up_time = up_time;
}

public String getSummary() {
return summary;
}

public void setSummary(String summary) {
this.summary = summary;
}

public String getHot() {
return hot;
}

public void setHot(String hot) {
this.hot = hot;
}

@Override
public String toString() {
return "Wall{" +
"id='" + id + '\'' +
", title='" + title + '\'' +
", content='" + content + '\'' +
", up_time=" + up_time +
", summary='" + summary + '\'' +
", hot='" + hot + '\'' +
'}';
}
}

新建接口

package cn.baldorange.anonymous.repository;

import cn.baldorange.anonymous.entity.Wall;
import org.springframework.data.jpa.repository.JpaRepository;

public interface WallRepo extends JpaRepository<Wall,String> {

}

SpringTest文件

package cn.baldorange.anonymous;

import cn.baldorange.anonymous.entity.Wall;
import cn.baldorange.anonymous.repository.WallRepo;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import java.util.Date;

@RunWith(SpringRunner.class)
@SpringBootTest
public class AnonymousApplicationTests {
@Autowired
WallRepo wallRepo;
@Test
public void contextLoads() {
wallRepo.save(new Wall("测试","文章",new Date(),"摘要","0"));
System.out.println(wallRepo.findById("1"));
}

}

运行结果如下所示:

到此DAO层的就结束了。

我们Commit后直接推上去

这就完成了一次代码提交

下面是关于SpringBoot整合其他项目的解决方法。可作为扩展参考

swagger引入

Swagger是一个接口文档工具,依照Swagger可以0配置开发接口。不过要注意,Swagger是基于SpringBoot1.47版本开发的,而SpringBoot现在基本都是是2+。
如果要选用restful支持,只能将SpringBoot退出到1+版本。
***

maven引入

<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>2.9.2</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>

15d0
<version>2.9.2</version>
</dependency>

Swagger配置文档

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.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@Configuration
@EnableSwagger2
public class swaggerConfig {
@Bean
Docket docket(){
return new Docket(DocumentationType.SWAGGER_2)
.select()
.apis(RequestHandlerSelectors.any())
.paths(PathSelectors.any())
.build()
.apiInfo(new ApiInfoBuilder().description("项目").build());
}
}

接口配置

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.just.computer.mathproject.Entity.Advertisement;
import org.just.computer.mathproject.Service.AdvertisementService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@Api(tags ="广告")
@RequestMapping("/Advertisement/")
public class AdvertisementController {
@Autowired
AdvertisementService advertisementService;

@ApiOperation(value ="获得所有广告")
@GetMapping("/getAllAdvertisement")
public List<Advertisement> getAllAdvertisement(){
return advertisementService.getAllAdvertisement();
}
@ApiOperation(value = "添加广告")
@GetMapping("/addAdvertisement")
public Boolean getAllAdvertisement(@RequestParam String img, @RequestParam String href){
try {
advertisementService.addAdvertisement(img,href);
return true;
}catch (Exception e){
return false;
}
}

@ApiOperation(value = "删除广告")
@GetMapping("/deleteAdvertisement")
public Boolean deleteAdvertisementById(Integer id){
try{
advertisementService.deleteAdvertisementById(id);
return true;
}catch (Exception e){
return false;
}
}
}

本地运行后访问这里即可访问
或者到ip:端口/swagger-ui.html
运行结果如下

SpringBoot引入websocket

maven 依赖

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

WebSocketConfig 配置文件

import org.springframework.context.annotation.Configuration;
import org.springframework.messaging.simp.config.MessageBrokerRegistry;
import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
import org.springframework.web.socket.config.annotation.WebSocketMessageBrokerConfigurer;

@Configuration
@EnableWebSocketMessageBroker
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
@Override
public void configureMessageBroker(MessageBrokerRegistry config){
config.enableSimpleBroker("/topic");
config.setApplicationDestinationPrefixes("/app");
}
@Override
public void registerStompEndpoints(StompEndpointRegistry registry){
registry.addEndpoint("/chat").setAllowedOrigins("*").withSockJS();
}
}

配置了之后基本上不用做其他的配置了
setAllowedOrigins()为跨域函数

然后是Controller

import org.just.computer.mathproject.Bean.Message;
import org.springframework.messaging.handler.annotation.MessageMapping;
import org.springframework.messaging.handler.annotation.SendTo;
import org.springframework.stereotype.Controller;

import java.security.Principal;
import java.util.Date;

@Controller
public class GreetingController {
@MessageMapping("/hello")
@SendTo("/topic/greetings")
public Message greeting(String content, Principal pl) throws Exception{
Message message = new Message();
message.setContent(content.substring(1,content.length()-1));
message.setData(new Date().toString());
message.setName(pl.getName());
return message;
}
}

这里的Principal 为SpringSecurity相关知识,目的是通过session获得用户名。
到此为止,SpringBoot的配置已经没了

Vue通过stompClient使用webSocket

package.json

"dependencies&quo
1cf5
t;: {
"@tinymce/tinymce-vue": "^3.0.1",
"axios": "^0.19.0",
"echarts": "^4.2.1",
"element-ui": "^2.11.1",
"net": "^1.0.2",
"nprogress": "^0.2.0",
"sockjs-client": "^1.4.0",
"stompjs": "^2.3.3",
"tinymce": "^4.8.5",
"tinymce-vue": "^1.0.0",
"vue": "^2.5.2",
"vue-axios": "^2.1.4",
"vue-echarts": "^4.0.3",
"vue-router": "^3.0.1",
"vue-stomp": "0.0.5"
}

一定要填加的有vue-stomp sockjs-client stompjs这三个
想用的地方直接引入。

import SockJS from 'sockjs-client'
import Stomp from 'webstomp-client'

vue中完整代码如下

<template>
<div>
<input type="text" v-model="text">
<button @click="sendMessage">发送消息</button>
<div class="bubble">
</div>
<div>
<div v-for="(data,key) in datas" :key="key">
{{data.content}}
</div>
</div>
</div>
</template>
<script>
import SockJS from 'sockjs-client'
import Stomp from 'webstomp-client'
export default {
name: 'ChatRoom',
data () {
return {
text: '',
datas: [],
stompClient: null
}
},
mounted () {
if ('WebSocket' in window) {
this.initWebSocket()
} else {
alert('当前浏览器 Not support websocket')
}
},
methods: {
sendMessage () {
this.stompClient.send('/app/hello', JSON.stringify(this.text), {})
},
initWebSocket () {
this.connection()
},
connection () {
const socket = new SockJS(this.$baseUrl + '/chat')
this.stompClient = Stomp.over(socket)
this.stompClient.connect({}, (frame) => {
this.stompClient.subscribe('/topic/greetings', (greeting) => {
console.log(JSON.parse(greeting.body))
this.datas.push(JSON.parse(greeting.body))
})
})
}
}
}
</script>

<style scoped>
</style>

注意在这行代码this.stompClient.send('/app/hello', JSON.stringify(this.text), {}) {}的位置,有的版本可能是相反的。
运行结果如下所示

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