Spring Boot自动配置实战 1、新建Spring-boot-starter-hello项目。 2、新建HelloService.java

package com.tzp.helloworld.helloservice;public class HelloService {    private String msg;    public String sayHello() {        return "=======>>" + msg;    }    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }}

 

2、新建HelloServiceProperties.java

package com.tzp.helloworld.helloproperties;import org.springframework.boot.context.properties.ConfigurationProperties;@ConfigurationProperties(prefix = "hello")public class HelloServiceProperties {    private static final String MSG = "World";        private String msg = MSG;    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    }

 

3、新建HelloServiceAutoConfigration.java

package com.tzp.helloworld.helloServiceConfigration;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;import org.springframework.boot.context.properties.EnableConfigurationProperties;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import com.tzp.helloworld.helloproperties.HelloServiceProperties;import com.tzp.helloworld.helloservice.HelloService;@Configuration@EnableConfigurationProperties(HelloServiceProperties.class)@ConditionalOnClass(HelloService.class)@ConditionalOnProperty(prefix = "hello",value = "enabled",matchIfMissing = true)public class HelloServiceAutoConfigration {    @Autowired    private HelloServiceProperties helloServiceProperties;        @Bean    @ConditionalOnMissingBean(HelloService.class)    public HelloService helloService() {        HelloService helloService = new HelloService();        helloService.setMsg(helloServiceProperties.getMsg());        return helloService;    }    }

 

4、mvn install将项目打成jar包，并将jar包添加到本地maven仓库。 5、接下来我们就可以在别的工程上使用该jar包了。

         
      
       com.tzp
          
      
       spring-boot-starter-hello
      　　
      
       1.0.0
      
     

hello:  msg: 唐增平的springboot

package com.tzp.helloworld.controller;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.tzp.helloworld.helloservice.HelloService;@RestControllerpublic class HelloSpringBoot {    @Value("${melo.name}")    private String name;    @Autowired    private HelloService helloService;    @RequestMapping("/")    public String hello() {        return "hello spring boot " + name + helloService.getMsg();    }}

6、运行项目并访问。