从零开始，IntelliJ IDEA快速创建 SpringBoot 项目

准备

• Java JDK8 下载 https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html

• 开发工具 IntelliJ IDEA 下载 https://www.jetbrains.com/idea/

• 接口调试工具 Postman 下载 https://www.postman.com/downloads/

创建项目

用IDEA创建SpringBoot项目
打开IDEA，点击创建新的项目

创建Spring项目，如果默认的url太慢，可以用阿里云的 https://start.aliyun.com

填写工程信息
Group：一般是公司域名反过来，Artifact：项目名称，Type: Maven，Java版本为8

修改配置

删除src目录下的test目录，这个是测试用的，暂且删除。

pom.xml修改如下

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.llh</groupId>
    <artifactId>spring-boot-demo1</artifactId>
    <version>1.0.0</version>
    <name>spring-boot-demo1</name>
    <description>初识springboot</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.3.7.RELEASE</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>

    </dependencies>

</project>

application.properties 如下

spring.application.name=spring-boot-demo1
server.port=8080

主要代码

HelloController类

package com.llh.springbootdemo1.controller;

import org.springframework.web.bind.annotation.*;

@RestController
public class HelloController {

    @GetMapping("/test0")
    public String test0() {
        return "hello world";
    }
    
    @GetMapping("/test1/{name}")
    public String test1(@PathVariable("name") String name) {
        return name;
    }

    @GetMapping("/test2")
    public String test2(@RequestParam("name") String name) {
        return name;
    }

    @PostMapping("/test3")
    public String test3(@RequestBody UserInfo userInfo) {
        return userInfo.toString();
    }
}

UserInfo类

package com.llh.springbootdemo1.controller;

public class UserInfo {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "UserInfo{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

测试接口

get请求可以直接在浏览器输入网址 http://localhost:8080/test0

post请求需要通过Postman工具，注意接口方式改为post，传入参数改为JOSN格式