Spring Boot 学习之路——1 入门demo
前言:
使用Spring Boot已有一年多时间,却从未静下心来总结,今天抽空写个傻瓜式教程,巩固一下。
Spring Boot的主要优点:
- 为所有Spring开发者更快的入门
- 开箱即用,提供各种默认配置来简化项目配置
- 内嵌式容器简化Web项目
- 没有冗余代码生成和XML配置的要求(Spring 4可实现零配置)
入门demo很简单,实现一个简单的Http 请求处理。废话不说看截图。
- IDE : IntelliJ IDEA 2018.1 x64
- JDK : 1.8
- Spring Framework 5.0.5
1.创建项目
创建完毕,项目结构如下:
2 添加Controller
controller代码如下:
package com.joanna.springbootdemo.demo.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController @RequestMapping(value = "/sayHello") public class SayHello { @RequestMapping(value = "/humanSays", method = RequestMethod.GET) public String humanSays(@RequestParam(name = "name", required = false) String name, @RequestParam(name = "comeFrom", required = false) String comeFrom) { return "Hello " + name + ", who comes from " + comeFrom + ", I'm a human"; } @RequestMapping(value = "/catSays", method = RequestMethod.GET) public String catSays(@RequestParam(name = "name", required = false) String name) { return "Hello " + name + ", I'm a cat"; } @RequestMapping(value = "/dogSays", method = RequestMethod.GET) public String dogSays(@RequestParam(name = "name", required = false) String name) { return "Hello " + name + ", I'm a dog"; } }
添加pom依赖如下(idea自动add dependency,棒棒哒):
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency>
3 启动
启动方式:
- Application类main方法启动
- mvn clean install/package cd 到target目录,java -jar 项目.jar,注意这里需要加入依赖spring-boot-maven-plugin生成可执行的jar
- mvn spring-boot: run 启动
启动后,打开浏览器中访问:http://localhost:8080/sayHello/humanSays?name=Joanna&comeFrom=China
可以看到页面输出:Hello Joanna, who comes from China, I'm a human
打完收工。