springboot之自定义starter

1、创建一个Empty Project

2、在该工程中点击+,选择new module,新建一个maven工程

点击确定。

3、在该工程中点击+,选择new module,新建一个Spring Initializr工程 

后面直接默认next,然后点击finishi。

两个都创建完毕之后点击apply,点击OK。得到如下结构:

4、在gong-spring-boot-starter中引入gong-spring-boot-starter-autoconfigurer,即在gong-spring-boot-starter的pom.xml中

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.gong.starter</groupId>
    <artifactId>gong.spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <!--引入自动配置模块-->
        <dependency>
            <groupId>com.gong.starter</groupId>
            <artifactId>gong-spring-boot-starter-autoconfigurer</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

我们看下gong-spring-boot-starter-autoconfigurer中的pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.gong.starter</groupId>
    <artifactId>gong-spring-boot-starter-autoconfigurer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>gong-spring-boot-starter-autoconfigurer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <!--引入spring-boot-starter:所有starter基本配置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

    </dependencies>

</project>

删除掉创建项目时自动配置的其它东西,只需要一个标红的依赖即可。

5、在gong-spring-boot-starter-autoconfigurer就可以编写场景启动的相关逻辑啦。

(1)新建如下目录结构及文件

springboot启动入口可以删去,resources下文件删去,test文件夹删去。在com.gong.starter下新建以上三个java文件,在resources下新建META-INF文件夹,再新建spring.factories文件。

HelloService.java

package com.gong.starter;

public class HelloService {

    HelloProperties helloProperties;

    public HelloProperties getHelloProperties() {
        return helloProperties;
    }

    public void setHelloProperties(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }

    public String sayHelloGong(String name){
        return helloProperties.getPrefix()+"-" +name + helloProperties.getSuffix();
    }
}

sayHelloGong方法可以获取HelloProperties中的属性,包括前缀和后缀,然后返回:前缀-name后缀。

HelloProperties.java

package com.gong.starter;

import org.springframework.boot.context.properties.ConfigurationProperties;

//绑定所有以gong.hello开头的配置
@ConfigurationProperties(prefix = "gong.hello")
public class HelloProperties {

    private String prefix;
    private String suffix;

    public String getPrefix() {
        return prefix;
    }

    public void setPrefix(String prefix) {
        this.prefix = prefix;
    }

    public String getSuffix() {
        return suffix;
    }

    public void setSuffix(String suffix) {
        this.suffix = suffix;
    }
}

绑定配置以及定义属性。

HelloServiceAutoConfiguration.java

package com.gong.starter;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration //是一个配置类
@ConditionalOnWebApplication //web应用才生效
@EnableConfigurationProperties(HelloProperties.class) //让属性文件生效
public class HelloServiceAutoConfiguration {

    @Autowired
    HelloProperties helloProperties;
    @Bean
    public HelloService helloService(){
        HelloService service = new HelloService();
        service.setHelloProperties(helloProperties);
        return service;
    }
}

自动配置类。要加入三个注解,并对方法使用@Bean标注。

最后,就是在spring.factories中进行配置自动注册:

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.gong.starter.HelloServiceAutoConfiguration

这样,我们自己定义的场景启动器就完成了。

接下来新建一个springboot项目进行测试,首先在pom.xml中导入自己定义的场景启动器:

        <!--引入自定义的starter-->
        <dependency>
            <groupId>com.gong.starter</groupId>
            <artifactId>gong.spring-boot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

然后编写application.properties定义场景启动器的属性:

gong.hello.prefix=GONG
gong.hello.suffix=HELLO WORLD

接着编写一个测试类:

package com.gong.springbootjpa.controller;

import com.gong.starter.HelloService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @Autowired
    HelloService helloService;

    @GetMapping("/hello")
    public String hello(){
        return helloService.sayHelloGong("haha");
    }
}

启动服务器:

完美。 

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转载自www.cnblogs.com/xiximayou/p/12287034.html