SpringBoot使用动态Banner

Spring Boot 2.0 提供了很多新特性，其中就有动态 Banner。

1、pom依赖

<?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 https://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>2.0.0.RELEASE</version></parent><groupId>com.example</groupId><artifactId>spring-boot-banner</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-banner</name><description>spring-boot-banner</description><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2、启动类

package com.example;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}}

3、更换Banner

我们先来回顾一下在 Spring Boot 1.0 中如何更换启动 Banner，其实都很简单，只需要在

src/main/resources路径下新建一个banner.txt文件，banner.txt中填写好需要打印的字符串内容即可。

一般情况下，我们会借助第三方工具帮忙转化内容:

如网站http://www.network-science.de/ascii/将文字转化成字符串

如网站http://www.degraeve.com/img2txt.php可以将图片转化成字符串

我们以Hello World为启动字符串来进行测试：

.__           .__  .__                               .__       .___
|  |__   ____ |  | |  |   ____   __  _  _____________|  |    __| _/
|  |  \_/ __ \|  | |  |  /  _ \  \ \/ \/ /  _ \_  __ \  |   / __ | 
|   Y  \  ___/|  |_|  |_(  <_> )  \     (  <_> )  | \/  |__/ /_/ | 
|___|  /\___  >____/____/\____/    \/\_/ \____/|__|  |____/\____ | \/     \/                                                  \/ 

在 Spring Boot 2.0 项目src/main/resources路径下新建一个banner.txt文件，粘贴上述字符串，启动 Spring

Boot 项目观察启动日志，发现 Spring Boot 2.0 已经将默认的 Spring 字符串替换为 hello world。说明 Spring

Boot 2.0 也支持1.0更换 Banner 的方法。

接下来在 Spring Boot 2.0 项目中测试打印动态 Banner ，使用的gif如下：

同样我们将 banner.gif 文件放到项目的src/main/resources路径下，启动项目进行测试，输出栏打印信息如

下：

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通过上述输出我们发现 Spring Boot 在启动的时候，会将 gif 图片的每一个画面，按照顺序打印在日志中，所有的

画面打印完毕后，才会启动 Spring Boot 项目。

如果目录src/main/resources下同时存在banner.txt和banner.gif，项目会先将banner.gif每一个画面打

印完毕之后，再打印banner.txt中的内容。

项目的启动 Banner 有什么用呢，在一些大的组织或者公司中，可以利用这个特性定制自己专属的启动画面，增加

团队对品牌的认同感。