Spingboot 在idea下开启断点调试

学习springboot 开发web 应用，大家都是idea好用也试着用用，运行起来之后，想要调试，但是总不行，试了好久才搞好，必须要记下来：

用 Spring Initializr 构建的项目。

HelloWorldController.java:

package com.example.demo.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

@RestController
public class HelloWorldController {
    @RequestMapping("/hello") 
    public String hello() {
        return "Hello World";
    }
    
    @RequestMapping("/index")
    @ResponseBody
    public String index(HttpServletRequest req, HttpServletResponse resp) {
        resp.addHeader("Access-Control-Allow-Origin", "*");//在这里打断点，启动后小红点会被打上个小勾
        return "{'a':3333333399}";
    }
}

pom.xml :

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.1.4.RELEASE
         
    
    com.example
    demo
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot

    
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-tomcat
            provided
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.boot
            spring-boot-devtools
            true
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    false
                
            
        
    

重点来了：

pom中：

        
            
                org.springframework.boot
                spring-boot-maven-plugin
                
                    false