七，springBoot-SpringBootApplication注解

在demo里面，我们把启动方法和controller放在了一个类里面，在实际开发中，启动方法是放在一个单独的类里面的。

为此我们创建一个SpringApplication类作为单独的启动类，和Controller分离。创建目录如下：

①，Application.java

package com.springboot.application;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;

@EnableAutoConfiguration(exclude = {RedisAutoConfiguration.class})
@ComponentScan("com.springboot.controller") //指定Controller所在的包，默认扫描当前包以及当前包的子包
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }

}

②，IndexController.java

package com.springboot.controller;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@ConfigurationProperties(prefix = "PEOPLE")
public class IndexContoller {

    @RequestMapping("/index")
    @ResponseBody
    public String index(){
        return "Index";
    }

   /* @Value("${PEOPLE.name}")
    private String name;

    @Value("${PEOPLE.sex}")
    private String sex;*/

    private String name;

    private String sex;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @RequestMapping("/info")
    @ResponseBody
    public String getPeopleInfo(){
        return name+":"+sex;
    }

}

启动访问：

二，@SpringBootApplication(组合注解)

在Application启动类中，我们用了两个注解，我们可以用一个注解SpringBootApplication替换它们两个

//@EnableAutoConfiguration(exclude = {RedisAutoConfiguration.class})
//@ComponentScan("com.springboot.controller") //指定Controller所在的包，默认扫描当前包以及当前包的子包
@SpringBootApplication(scanBasePackages = {"com.springboot.controller"},exclude = {RedisAutoConfiguration.class})
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }

}

SpringBootApplication注解默认扫描当前包以及当前包的子包

=========扩展=======

@RestController

这个也是一个组合注解，当一个Controller中所有的功能方法都返回restful内容时，我们就可以将@Controller换成@RestController，这样的好处时不用每个方法都使用@ResponseBody。接下来以修改IndexController为例。

①，IndexController.java

package com.springboot.controller;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
@ConfigurationProperties(prefix = "PEOPLE")
public class IndexContoller {

    @RequestMapping("/index")
    public String index(){
        return "Index";
    }

   /* @Value("${PEOPLE.name}")
    private String name;

    @Value("${PEOPLE.sex}")
    private String sex;*/

    private String name;

    private String sex;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    @RequestMapping("/info")
    public String getPeopleInfo(){
        return name+":"+sex;
    }

}

demo1项目源码：

链接：https://pan.baidu.com/s/1Zkv7a7zhB8FJV_hU284McA 提取码：je64