SpringBoot自动配置实现

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创建SpringBoot自动配置

新建一个Maven工程
创建安全配置类

package com.cvsea.test.spring_boot_starter_hello;import org.springframework.boot.context.properties.ConfigurationProperties;@ConfigurationProperties(prefix="hello")//引用application.properties中的配置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;    }}

创建使用配置的Service

package com.cvsea.test.spring_boot_starter_hello;public class HelloService {    private String msg;    public String getMsg() {        return msg;    }    public void setMsg(String msg) {        this.msg = msg;    }    public String sayHello()    {        return "Hello,"+msg;    }}

创建自动配置类

package com.cvsea.test.spring_boot_starter_hello;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;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;@Configuration@EnableConfigurationProperties(HelloServiceProperties.class)@ConditionalOnClass(HelloService.class)@ConditionalOnProperty(prefix="hello",value="enabled",matchIfMissing=true)public class HelloServiceAutoConfiguration {    @Autowired    private HelloServiceProperties helloServiceProperties;    @Bean    public HelloService helloService()    {        HelloService helloService=new HelloService();        helloService.setMsg(helloServiceProperties.getMsg());        return helloService;    }}

使用spring.factories注册自动配置类

org.springframework.boot.autoconfiguration.EnableAutoConfig=com.cvsea.test.spring_boot_starter_hello.HelloServiceAutoConfiguration

测试

：使用starter创建一个SpringBoot项目，加入刚刚实现的自动配置的starter作为依赖

<dependency>    <groupId>com.cvsea</groupId>    <artifactId>spring-boot-starter-hello</artifactId>    <version>0.0.1-SNAPSHOT</version></dependency>

在application.properties添加配置内容

hello.msg=pxs

调用自动配置中的方法

package com.cvsea;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.cvsea.test.spring_boot_starter_hello.HelloService;@RestController@SpringBootApplicationpublic class Learning1Application {    @Autowired    HelloService helloService;    @RequestMapping("/")    public String hello()    {        return helloService.sayHello();     }    public static void main(String[] args) {        SpringApplication.run(Learning1Application.class, args);    }}

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