idea springboot 初探

从springboot 官网下载配置文件示例：

官网地址：https://start.spring.io/
此处选用mvn工程

将以上官网的pom.xml拷贝过来

在本地创建个maven程，javaversion改成1.8 （因为我本地
是1.8）

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.3</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

新建main程序：

添加示例代码：参考 https://spring.io/quickstart

              package com.example.demo;
              import org.springframework.boot.SpringApplication;
              import org.springframework.boot.autoconfigure.SpringBootApplication;
              import org.springframework.web.bind.annotation.GetMapping;
              import org.springframework.web.bind.annotation.RequestParam;
              import org.springframework.web.bind.annotation.RestController;
              
              @SpringBootApplication
              @RestController
              public class DemoApplication {
                
                  
                  public static void main(String[] args) {
                  SpringApplication.run(DemoApplication.class, args);
                  }
                  
                  @GetMapping("/hello")
                  public String hello(@RequestParam(value = "name", defaultValue = "World") String name) {
                  return String.format("Hello %s!", name);
                  }
                
              }
            

调整本地maven环境：

调整idea中maven settings 所用的xml, 指定本地maven插件地址,
此处直接用maven中央仓库，如果有nexus私库的也可以在这里配置

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">  
    <localRepository>${user.home}/.m2/repository</localRepository>
  </settings>

调整idea , 使之包自动下载

有的时候import中的内容会报错，显示没有此package. 所以要让idea自动导入包坐标。最终落地到pom.xml中。

此处可以参考 org.springframework.web.bind.annotation不存在这个处理解决方式。

测试是否可以跑通

测试地址是http://localhost:8080/hello