源码分析

本文源代码基于 Springboot 2.1.0

package org.springframework.boot.context.config;

import org.springframework.boot.ansi.AnsiOutput;
import org.springframework.boot.ansi.AnsiOutput.Enabled;
import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
import org.springframework.boot.context.properties.bind.Binder;
import org.springframework.context.ApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.env.ConfigurableEnvironment;

/**
 * An ApplicationListener that configures AnsiOutput depending on the
 * value of the property spring.output.ansi.enabled. See Enabled for valid
 * values.
 * 应用启动过程中当ApplicationEnvironmentPreparedEvent发生时配置AnsiOutput，
 * 具体的来说是从环境属性中按类型AnsiOutput.Enabled取出spring.output.ansi.enabled的值，
 * 如果存在的话则是用设置值调用类AnsiOutput静态方法setEnabled(Enabled enabled)。
 * 
 * @author Raphael von der Grün
 * @author Madhura Bhave
 * @since 1.2.0
 */
public class AnsiOutputApplicationListener
		implements ApplicationListener<ApplicationEnvironmentPreparedEvent>, Ordered {

	@Override
	public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
		ConfigurableEnvironment environment = event.getEnvironment();
		Binder.get(environment)
				.bind("spring.output.ansi.enabled", AnsiOutput.Enabled.class)
				.ifBound(AnsiOutput::setEnabled);
		AnsiOutput.setConsoleAvailable(environment
				.getProperty("spring.output.ansi.console-available", Boolean.class));
	}

	@Override
	public int getOrder() {
		// Apply after ConfigFileApplicationListener has called EnvironmentPostProcessors
		return ConfigFileApplicationListener.DEFAULT_ORDER + 1;
	}

}

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