spring boot 源码分析(一) 案例
前言
很久以前就想写点什么,可是一直没有合适的话题。今天终于决定以spring boot作为blog生涯的开篇,一方面总结自己的理解,另一方面也和广大猿友们交流探讨,以期提升。
第一个案例
准备
源码获取地址:https://github.com/spring-projects/spring-boot
pom.xml:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
demo
package per.dyp;
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
@RestController
@SpringBootApplication
@RequestMapping("/rest")
public class HelloController {
@RequestMapping("/sayHello/{name}")
public String sayHello(@PathVariable String name) {
return "Hello " + name;
}
public static void main(String[] args) throws Exception {
SpringApplication.run(HelloController.class, args);
}
}
运行main
方法,浏览器输入http://localhost:8080/rest/sayHello/dyp
浏览器显示Hello dyp
@SpringBootApplication 注解源码
package org.springframework.boot.autoconfigure;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.AliasFor;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@Configuration
@EnableAutoConfiguration
@ComponentScan
public @interface SpringBootApplication {
Class<?>[] exclude() default {};
String[] excludeName() default {};
@AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
String[] scanBasePackages() default {};
@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
Class<?>[] scanBasePackageClasses() default {};
}
对注解感兴趣的可以自行研究,这里不进行表述