SpringBoot入门构建Restful服务

快来打我* 2022-03-20 06:20 214阅读 0赞

### 前言： ###

springboot所需要的:

> JDK 1.8 or later  
> Gradle 4+ or Maven 3.2+

本文使用Eclipse来构建

### 开始构建： ###

**一.Eclipse需要安装spring tools插件**

菜单栏-->Help--->Eclipse MarketPlace -->输入spring tool , 点击install安装

![1116722-20181013142058376-1038377709.png][]

**二.创建Spring Boot工程**

安装了spring tool插件之后，就可以在项目列表中找到spring的相关选项了

File--> New--> Spring Boot-->Spring Start Project

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70][]

点击Next-->Next，一路默认即可

在选择dependencies的选项卡中，勾上Web->Web

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70 1][]

点击finish，完成！

项目结构图如下：

![20190211152605530.png][]

## ##

### 三.测试 ###

在默认的com.example.demo下面新建一个helloworldController类

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70 2][]

helloworldController.java:

package com.example.demo;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class helloworldController {
    
       @RequestMapping("/hello")
        public String hello(){
            return "Welcome to start the Boot!";
        }
    }

> @RestController注解相当于@ResponseBody ＋ @Controller合在一起的作用

选择MyBootdemoApplication，右键Run As-->Spring boot app

然后访问：localhost:8080/hello

![20190211153859701.png][]

成功了

PS：由于spring boot是默认内置了tomcat,所以默认端口是8080

### 四.构建restful服务 ###

参考官网文档：[https://spring.io/guides/gs/rest-service/][https_spring.io_guides_gs_rest-service]

我们对刚刚的helloworldcontroller.java稍作修改

package com.example.demo;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    import java.util.concurrent.atomic.AtomicLong;
    import org.springframework.web.bind.annotation.RequestParam;
    
    @RestController
    public class helloworldController {
    
       @RequestMapping("/hello")
        public String hello(){
            return "Welcome to start the Boot!";
        }
       
       private static final String template = "Hello, %s!";
       private final AtomicLong counter = new AtomicLong();
    
       @RequestMapping("/greeting")
       public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
           return new Greeting(counter.incrementAndGet(),
                               String.format(template, name));
       }
    }
    
    
    
     class Greeting {
    
        private final long id;
        private final String content;
    
        public Greeting(long id, String content) {
            this.id = id;
            this.content = content;
        }
    
        public long getId() {
            return id;
        }
    
        public String getContent() {
            return content;
        }
    }

这里我偷懒不想新建一个pojo类了，直接把Greeting  Class写在了下面

OK，代码很简单，通过@RequestMapping("/greeting") 拦截greeting，然后获取url中name参数，不传的话默认为“World”

传入递增的长整型id和name属性，然后构造生成pojo类Greeting， 将对象转化成json格式返回给浏览器

试一下，访问：http://localhost:8080/greeting?name=abc![20190211155707181.png][]

一个简单的springboot服务搭建完成！

未完待续。。。。。。

[1116722-20181013142058376-1038377709.png]: /images/20220320/a299c91e3c424a28bacbe19c4dbbacb1.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70]: /images/20220320/e5cce073ccab4d4b8498415c6ec62884.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70 1]: /images/20220320/429dc72fc44f4fb9acb465c8da6c77b1.png
[20190211152605530.png]: /images/20220320/98a0c1dc0a88469481b56bf1738144e9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3djYzI3ODU3Mjg1_size_16_color_FFFFFF_t_70 2]: /images/20220320/358864b28e94411bb7c24cae55eb6130.png
[20190211153859701.png]: /images/20220320/f0ec95aa8e454b6da45923d438c3c134.png
[https_spring.io_guides_gs_rest-service]: https://spring.io/guides/gs/rest-service/
[20190211155707181.png]: /images/20220320/4349daae9c374a5a8254a2ab4fef09b8.png