学习springboot过程中的问题之无法引入@requestmapping注解_springboot项目找不到requestmapping注解

1.在创建好springboot maven项目之后，在controller中无法使用@requestmapping 注解。

因为缺少了 spring-web.jar包。需要在pom.xml中引入以下代码：

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

引入之后，对该项目进行update 待包下载完毕，注解可以使用。如下

package com.test.simaple.contoller;
 
 
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
@RequestMapping("/")
public class HelloController {
 
	
	@RequestMapping("/getHello")
	public String getHello(){
		
		return "";
	}
}

2.启动springboot  访问后台报错

This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri Apr 27 17:34:34 CST 2018
There was an unexpected error (type=Internal Server Error,