剛開始接觸SpringBoot，看了一些入門的資料，但是比較有意思的是從最簡單的hello world到後面程式碼都不變了啊23333，要改註解的

不是在含main的類裡增加其他包含RequestMapping的controller的類的定義，需要對含main函式的類進行註解，以指向controller類。

方法有兩種，一種是用

@ComponentScan(value = {"controller所在包名"})

@SpringBootApplication

package id0.id1.controller;

import java.util.Date;

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

@RestController
@RequestMapping("/")
public class Ctl {
    @RequestMapping(value="/", method=RequestMethod.GET)
    String home(){
        return "Hello world";
	}
		
	@SuppressWarnings("deprecation")
	@RequestMapping("/now")
	String getTime(){
		return "Current time: " + (new Date()).toLocaleString();
	}
}
 

package com.test;

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

@ComponentScan(value = {"com.test.controller"})
@EnableAutoConfiguration
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        SpringApplication.run(App.class, args);
    }
}
 

package com.test.controller;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@EnableAutoConfiguration
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        SpringApplication.run(App.class, args);
    }
}