003讲到了导入jar包中的方法,但其实是个半成品,别人写的jar包中的方法我要在自己的代码中去调用,非常的不方便。原则上写给别人用的jar包,人家要能直接用,而不用写注入的方法。
在springboot中会自动扫描imports文件中的内容,利用这一点进行自动注入的开发
以下是整个jar包的目录
Country
java
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package cn.itcast.pojo;
public class Country {
private String name;
private String system;
public Country() {
}
public Country(String name, String system) {
this.name = name;
this.system = system;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getSystem() {
return this.system;
}
public void setSystem(String system) {
this.system = system;
}
public String toString() {
return "Country{name='" + this.name + "', system='" + this.system + "'}";
}
}
Province
java
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package cn.itcast.pojo;
public class Province {
private String name;
private String direction;
public Province() {
}
public Province(String name, String direction) {
this.name = name;
this.direction = direction;
}
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
public String getDirection() {
return this.direction;
}
public void setDirection(String direction) {
this.direction = direction;
}
public String toString() {
return "Province{name='" + this.name + "', direction='" + this.direction + "'}";
}
}
CommonConfig
java
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package cn.itcast.config;
import cn.itcast.pojo.Country;
import cn.itcast.pojo.Province;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Bean;
public class CommonConfig {
public CommonConfig() {
}
@ConditionalOnProperty(
prefix = "country",
name = {"name", "system"}
)
@Bean
public Country country(@Value("${country.name}") String name, @Value("${country.system}") String system) {
return new Country(name, system);
}
@Bean
public Province province() {
return new Province();
}
}
CommonAutoConfig
java
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//
package cn.itcast.config;
import org.springframework.boot.autoconfigure.AutoConfiguration;
import org.springframework.context.annotation.Import;
@AutoConfiguration
@Import({CommonConfig.class})
public class CommonAutoConfig {
public CommonAutoConfig() {
}
}
xxx.imports
java
cn.itcast.config.CommonAutoConfig
以上封装好的jar包就能自动注入了
接着在工程中引用
java
package com.geji;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
/**
* Hello world!
*
*/
@SpringBootApplication
public class SpringbootAutoConfigApplication
{
public static void main( String[] args )
{
ApplicationContext context= SpringApplication.run(SpringbootAutoConfigApplication.class,args);
System.out.println(context.getBean("dispatcherServlet"));
System.out.println(context.getBean("province"));
}
}
以上是自动配置功能项目中也能用了,但是在实际工作中会更进一步,编写starter用来实现依赖管理功能,这样的话给别人用的时候就更方便了
创建两个maven工程dmybatis-spring-boot-aotuconfigure,dmybatis-spring-boot-starter
dmybatis-spring-boot-aotuconfigure无所谓的,跟上半篇一模一样
在dmybatis-spring-boot-aotuconfigure编写Porn.xml
在dmybatis-spring-boot-aotuconfigure编写自动配置类
编写可以给spring自动扫描的配置文件
以下文件没用到,删了
dmybatis-spring-boot-starter引入dmybatis-spring-boot-aotuconfigure和dmybatis-spring-boot-aotuconfigure本身引入的其他包
dmybatis-spring-boot-starter只是个依赖管理,删除其他文件
以上就完成了,这样就能在其他项目中直接引入了