参照:http://www.justdojava.com/2019/07/20/java-springboot-starter/#
1.SpringBoot Starter
Starters are a set of convenient dependency descriptors that you can include in your application.2.创建starter
2.1 创建springboot工程zsdy-json-spring-boot-starter,并加入自动装配spring-boot-autoconfigure和fastjson的依赖
<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.zsdy</groupId>
<artifactId>zsdy-json-spring-boot-starter</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>2.1.6.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.58</version>
</dependency>
</dependencies>
</project>2.2 创建MyJsonService
package com.zsdy.json;
import com.alibaba.fastjson.JSON;
public class MyJsonService {
private String name;
/**
* 使用 fastjson 将对象转换为 json 字符串输出
*/
public String objToJson(Object object) {
return getName() + JSON.toJSONString(object);
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}2.3 创建配置类MyJsonProperties
package com.zsdy.json;
import org.springframework.boot.context.properties.ConfigurationProperties;
@ConfigurationProperties(prefix = "ziyou.json")
public class MyJsonProperties {
public static final String DEFAULT_NAME = "ziyou";
private String name = DEFAULT_NAME;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}2.4 创建自动化配置类
package com.zsdy.json;
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.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@ConditionalOnClass({MyJsonService.class})
@EnableConfigurationProperties(MyJsonProperties.class)
public class MyJsonAutoConfiguration {
/**
* 注入属性类
*/
@Autowired
private MyJsonProperties myJsonProperties;
/**
* 当当前上下文中没有 MyJsonService 类时创建类
*/
@Bean
@ConditionalOnMissingBean(MyJsonService.class)
public MyJsonService myJsonService() {
MyJsonService myJsonService = new MyJsonService();
myJsonService.setName(myJsonProperties.getName());
return myJsonService;
}
}2.5 创建spring.factories(resource/META-INF/),增加自动装配的类
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.zsdy.json.MyJsonAutoConfiguration2.6 然后我们通过运行mvn install命令，将这个项目打包成 jar 部署到本地仓库中，提供让另一个服务调用,自此starter就构建成功了。
3.调用自创建的SpringBoot Starter(和其它SpringBoot Starter调用一样)
3.1 创建一个新的 SpringBoot web项目zsdy-json，并提供一个接口进行测试
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.zsdy</groupId>
<artifactId>zsdy-json</artifactId>
<version>1.0-SNAPSHOT</version>
<name>zsdy-json</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.zsdy</groupId>
<artifactId>zsdy-json-spring-boot-starter</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>3.2 配置application.properties
server.port=8080
ziyou.json.name=json-zsdy3.3 测试接口
package com.zsdy.controller;
import com.zsdy.enity.User;
import com.zsdy.json.MyJsonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author zsdy
* @create 2019-08-02 11:39
**/
@RestController
public class JsonController {
@Autowired
private MyJsonService myJsonService;
@RequestMapping(value = "json")
public String beanToJson() {
User user = new User();
user.setName("小明");
user.setAge(20);
String toJson = myJsonService.objToJson(user);
return toJson;
}
}3.4 启动zsdy-json项目，打开浏览器访问接口 http://localhost:8080/json 可以看到如下效果。
json-zsdy{"age":20,"name":"小明"}至此,我们就完成了快速开发一个自定义SpringBoot Starter.