Spring Boot 开发入门

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前言

Spring Boot 开发入门

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一、Spring Boot编写helloworld

1、首先使用IDEA创建一个Spring Boot项目文件
2、在web文件目录下建立一个新的html文件hello
3、在标题中将其修改为hello
4、添加正文为“helloword Spring Boot！这是一个用Spring Boot开发的网站”

5、点击右上角网页打开按钮

6、显示结果

二、RESTful 接口的 Web服务

1.RESTful 是什么

1、RESTful 的本质核心是一种软件架构，可以降低开发复杂性，提高系统可伸缩性。
2、http协议是属一种应用层协议结构为：
schema://host[：port]/path[？query-stringl][#anchor]

scheme：指定低层使用的协议（例如：http，https，ftp）
host：服务器的IP地址或者域名
port：服务器端口，默认为80,https默认端口为443
path：访问资源的路径
query-string：发送给htp服务器的数据
anchor：锚

三、创建Web项目

一，在com.example.demo中创建三个三个包并创建相应的类：

二、添加相应代码
Count：

package com.example.demo.bean;
 
public class Count {
    
    
    private int count;
 
    public int getCount() {
    
    
        return count;
    }
 
    public void setCount(int count) {
    
    
        this.count = count;
    }
}

ResourceController：

 import com.example.demo.service.ResourceService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
 
@RestController
public class ResourceController {
    
    
 
    @Autowired
    ResourceService resourceService;
 
    @RequestMapping(value = "/me/count", method = RequestMethod.PUT)
    @ResponseBody
    public void initCount(@RequestBody Count count){
    
    
        resourceService.initCount(count);
    }
 
    @RequestMapping(value = "/me/count", method = RequestMethod.POST)
    @ResponseBody
    public void modifyCount(@RequestBody Count count){
    
    
        resourceService.addCount(count);
    }
 
    @RequestMapping(value = "/me/count", method = RequestMethod.GET)
    @ResponseBody
    public  Count getCount()
    {
    
    
        return resourceService.getCount();
    }
}

ResourceManager：

package com.example.demo.manager;
 
public class ResourceManager {
    
    
    private int count = 0;
 
    private static ResourceManager instance = new ResourceManager();
 
    private ResourceManager(){
    
    }
 
    public static ResourceManager getInstance(){
    
    
        return instance;
    }
 
    public synchronized void addCount(int i){
    
    
        count = count + i;
    }
 
    public synchronized  void minusCount(int i){
    
    
        count = count -i;
    }
 
    public int getCount(){
    
    
        return count;
    }
 
    public void initCount(int i){
    
    
        count = i;
    }
}

ResourceService：

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package com.example.demo.service;
 
import com.example.demo.bean.Count;
import com.example.demo.manager.ResourceManager;
import org.springframework.stereotype.Service;
 
@Service
public class ResourceService {
    
    
    public void addCount(Count count){
    
    
        if (count != null){
    
    
            ResourceManager.getInstance().addCount(count.getCount());
        }
    }
 
    public void minusCount(Count count){
    
    
        if (count != null) {
    
    
            ResourceManager.getInstance().minusCount(count.getCount());
        }
    }
 
    public Count getCount()
    {
    
    
        Count count = new Count();
        count.setCount(ResourceManager.getInstance().getCount());
        return count;
    }
 
    public void initCount(Count count){
    
    
        if (count != null) {
    
    
            ResourceManager.getInstance().initCount(count.getCount());
        }
    }
}

三、运行结果