背景
初次运行springboot的小伙伴想必对于springboot打印的banner很感兴趣
spring boot在启动项目时，控制台会打印一个spring的logo。如果不做任何配置
该信息来源于springbootbanner类的静态常量banner，该属性是一个字符串数组，不指定任何banner属性时，控制台默认输出该数组数据。我们可以通过spring boot提供的强大配置功能来改变banner的输出。
通常长成这样
一个spring扑面而来~
那么我们能否定制自己的启动页呢？
源码
springboot在启动时会调用如下一段代码
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private banner printbanner(configurableenvironment environment) {
if (this.bannermode == banner.mode.off) {
return null;
}
resourceloader resourceloader = this.resourceloader != null ? this.resourceloader
: new defaultresourceloader(getclassloader());
springapplicationbannerprinter bannerprinter = new springapplicationbannerprinter(
resourceloader, this.banner);
if (this.bannermode == mode.log) {
return bannerprinter.print(environment, this.mainapplicationclass, logger);
}
return bannerprinter.print(environment, this.mainapplicationclass, system.out);
}
public banner print(environment environment, class<?> sourceclass, printstream out) {
banner banner = getbanner(environment, this.fallbackbanner);
banner.printbanner(environment, sourceclass, out);
return new printedbanner(banner, sourceclass);
}
private banner getbanner(environment environment, banner definedbanner) {
banners banners = new banners();
banners.addifnotnull(getimagebanner(environment));
banners.addifnotnull(gettextbanner(environment));
if (banners.hasatleastonebanner()) {
return banners;
}
if (this.fallbackbanner != null) {
return this.fallbackbanner;
}
return default_banner;
}
private static final banner default_banner = new springbootbanner();
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而 springbootbanner长成这样
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/**
* default banner implementation which writes the 'spring' banner.
*
* @author phillip webb
*/
class springbootbanner implements banner {
private static final string[] banner = { "",
" . ____ _ __ _ _",
" /\\\\ / ___'_ __ _ _(_)_ __ __ _ \\ \\ \\ \\",
"( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\",
" \\\\/ ___)| |_)| | | | | || (_| | ) ) ) )",
" ' |____| .__|_| |_|_| |_\\__, | / / / /",
" =========|_|==============|___/=/_/_/_/" };
private static final string spring_boot = " :: spring boot :: ";
private static final int strap_line_size = 42;
@override
public void printbanner(environment environment, class<?> sourceclass,
printstream printstream) {
for (string line : banner) {
printstream.println(line);
}
string version = springbootversion.getversion();
version = (version == null ? "" : " (v" + version + ")");
string padding = "";
while (padding.length() < strap_line_size
- (version.length() + spring_boot.length())) {
padding += " ";
}
printstream.println(ansioutput.tostring(ansicolor.green, spring_boot,
ansicolor.default, padding, ansistyle.faint, version));
printstream.println();
}
}
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上述代码可以看到banner存在两种 imagebanner和textbanner
imagebanner需要配置属性为banner.image.location
或者支持名为banner格式为 "gif", "jpg", "png的图片
textbanner支持默认情况下在banner.location 或者默认为banner.txt
比如我们可以如下设置
在resource分别放置banner.txt和banner.png
banner.png
banner.txt
/$$$$$$$$ /$$$$$$
| $$_____//$$__ $$
| $$ | $$ \__/
| $$$$$ | $$$$$$$
| $$__/ | $$__ $$
| $$ | $$ \ $$
| $$ | $$$$$$/
|__/ \______/
我们可以看一下结果
哈哈 f6小人变成了这样！！！
关闭banner显示
在程序中可以使用app.setbannermode(mode.off);来关闭banner，利用属性值设置则为：spring.main.banner-mode=off
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://my.oschina.net/qixiaobo025/blog/1573647