Spring Boot 开发入门--- RESTful 接口的 Web服务

2023-11-06 09:39:28

文章目录

前言
一、创建项目
二、代码编写
三、项目测试
参考文章

前言

初步了解HTTP协议，掌握B/S之间的请求Request、服务响应Response和get、put、post等主要概念和技术方法

一、创建项目

▪ 创建spring boot

▪ 选择修改Group、Artifact

▪ 选择Web -> Spring Web

▪ 选择项目保存路径，然后Finish

二、代码编写

演示的功能就是提供一个计数器功能，可以初始化计数器，修改计数器，查询计数器当前值。没有使用数据库，直接用一个单例类来模拟了，项目结构如下：

Count:

package com.res.resource.bean;

public class Count {
    private int count;

    public int getCount(){
        return count;
    }

    public void setCount(int count){
        this.count=count;
    }
}

ResourceController:

package com.res.resource.controller;

import com.res.resource.bean.Count;
import com.res.resource.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.res.resource.manager;

import org.springframework.stereotype.Service;

@Service
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:

package com.res.resource.service;

import com.res.resource.bean.Count;
import com.res.resource.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());
        }
    }
}

项目成功启动：