springboot开发第一个案例之hello，world！

leehao

发布于 2025-02-10 12:10:21

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代码可运行

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代码可运行

开发环境：（1）Eclipse Java EE Version: Neon Release (4.6.0) Build id: 20160613-1800

　　　　　（2）apache-maven-3.2.5

　　　　　（3）jdk 1.8

配置：（1）Java_HOME 和jdk path路径

　　　（2）在eclipse里面配置maven：打开windows- preferences-maven。installations里面点击add，添加本地解压包maven的安装路径。在User Settings里面设置User Settings路径为：maven安装路径下的文件：我的是D:\apache-maven-3.2.5\conf\settings.xml。打开D:\apache-maven-3.2.5\conf\settings.xml文件，修改里面的为<localRepository>C:\Users\Hao\.m2\repositorys</localRepository>，这里主要存放所需的依赖和jar包。

开发：新建maven项目。

修改pom.xml：

<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>A</groupId>
  <artifactId>A</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>A</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

     <!-- Inherit defaults from Spring Boot -->  
    <parent>
        <groupId>org.springframework.boot</groupId>  
        <artifactId>spring-boot-starter-parent</artifactId>  
        <version>1.3.6.RELEASE</version>  
    </parent> 

<!-- Add typical dependencies for a web application -->  
    <dependencies>  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>  
    </dependencies>  
  
  
</project>

App类：

package A;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication

@ComponentScan("controller")
public class App 
{
    public static void main( String[] args )
    {
         SpringApplication.run(App.class, args);
    }
}

其中：

@ComponentScan("controller") 标识controller所在文件夹

controller
package controller;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("echo")
public class TestController {

    @RequestMapping("/{text}")
    public String echo(@PathVariable("text") String text){
        return "hello world," + text;
    }
}