springboot~入门第一篇~

 首先新建个 maven 项目
菜单 -> File -> New -> Other -> Maven -> Maven -> Maven Project -> New Maven Project
勾上这个 Create a simple project (skip archetype selection),

Springboot就是个简单的maven 项目

设置下面参数（自己写）

用下面的pom.xml数据覆盖项目里的

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
 
  <groupId>com.how2java</groupId>
  <artifactId>springboot</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>springboot</name>
  <description>springboot</description>
   
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
              <groupId>junit</groupId>
              <artifactId>junit</artifactId>
              <version>3.8.1</version>
              <scope>test</scope>
        </dependency>
    </dependencies>
 
    <properties>
        <java.version>1.8</java.version>
    </properties>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
 
</project>

再在src下创建一个Application.java文件(有点类似Jfinal里的run里的JfinalConfig启动文件)

package springboot;

 
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
 
}
 

创建一个HelloController.java（控制器）文件

package springboot;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class HelloController {
 
    @RequestMapping("/hello")
    public String hello() {
        return "Hello Spring Boot!";
    }
 
}

再运行Application.java文件。

通过http://127.0.0.1:8080/hello  访问

看到

你就入门springboot啦

 运行时

运行提示“错误: 找不到或无法加载主类”   详细解决见    https://www.cnblogs.com/iyyy/p/8085719.html#4023391

然而只是访问控制器是不够的，还得访问到页面。

待续...