spring boot实战(第五篇)配置源码解析

前言

前面的文章都采用markdown编写的，但编辑图片上极其不方便，以后还是采用网页的形式。

上一篇中讲述了spring boot配置文件的使用，本篇开始从源码的角度来看看配置文件。

环境(Environment)

学习过spring的同学都清楚，在bean中注入Enviroment实例即可调用配置资源信息，如以下代码

package com.lkl.springboot.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;

/**
 * 注入enviroment
 * 
 * @author liaokailin
 * @version $Id: DIEnviroment.java, v 0.1 2015年10月2日 下午9:17:19 liaokailin Exp $
 */
@Component
public class DIEnviroment {
    @Autowired
    Environment environment;

    public String getProValueFromEnviroment(String key) {
        return environment.getProperty(key);
    }
}

      spring boot是如何来构建环境??

来看  SpringApplication.run(String... args)中的代码

// Create and configure the environment
			ConfigurableEnvironment environment = getOrCreateEnvironment();

<p class="p1"><span class="s1">private</span> ConfigurableEnvironment getOrCreateEnvironment() {</p><p class="p1"><span>	</span><span>	</span><span class="s1">if</span> (<span class="s1">this</span>.<span class="s2">environment</span> != <span class="s1">null</span>) {</p><p class="p2"><span class="s3"><span>	</span><span>	</span><span>	</span></span><span class="s1">return</span><span class="s3"> </span><span class="s1">this</span><span class="s3">.</span>environment<span class="s3">;</span></p><p class="p1"><span>	</span><span>	</span>}</p><p class="p2"><span class="s3"><span>	</span><span>	</span></span><span class="s1">if</span><span class="s3"> (</span><span class="s1">this</span><span class="s3">.</span>webEnvironment<span class="s3">) {</span></p><p class="p1"><span>	</span><span>	</span><span>	</span><span class="s1">return</span> <span class="s1">new</span> StandardServletEnvironment();</p><p class="p1"><span>	</span><span>	</span>}</p><p class="p1"><span>	</span><span>	</span><span class="s1">return</span> <span class="s1">new</span> StandardEnvironment();</p><p class=