Spring中如何实现自定义的ProtocolResolver策略接口示例？

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ProtocolResolver是一个策略接口，可以用于自定义协议解析， 比如spring就有一个 “classpath:”开头的特定协议（但是spring并不是自定义ProtocolResolver 实现来完成这个功能的）

@FunctionalInterface public interface ProtocolResolver { @Nullable Resource resolve(String location, ResourceLoader resourceLoader); }

@FunctionalInterface:声明该接口是一个函数式接口,主要用于编译级错误检查，加上该注解，该接口中只能定义唯一一个方法。

spring提供了ProtocolResolver机制，用于匹配自定义的文件schema来加载文件；而且不干扰ResourceLoader的机制，最重要的是它会添加到spring环境下的所有的loader中。我们只需要扩展一个ProtocolResolver类，并将它在合适的实际加入到ResourceLoader即可，此后加载properties文件时我们的ProtocolResolver总会被执行

具体用法如下：

自定义MyProtocolResolver,加载资源时，当我们输入的资源路径以path:开头时，就会加载相对路径下的config/下相应的资源。

public class MyProtocolResolver implements ProtocolResolver { public static final String PATH = "path:"; @Override public Resource resolve(String location, ResourceLoader resourceLoader) { if (!location.startsWith(PATH)) return null; String realPath = location.substring(5); String classPath = "classpath:config/" + realPath; return resourceLoader.getResource(classPath); } }

测试：

DefaultResourceLoader resourceLoader=new DefaultResourceLoader();
resourceLoader.addProtocolResolver(new MyProtocolResolver());
Resource resource = resourceLoader.getResource("path:config.txt");
InputStream inputStream = resource.getInputStream();
StringBuffer out = new StringBuffer();
byte[] b = new byte[4096];
for (int n; (n = inputStream.read(b)) != -1; ) {
out.append(new String(b, 0, n));
}
System.out.println(out);

由此我们可以通过实现ProtocolResolver接口来定义我们自己的加载资源路径，也可以自定义自己加载资源路径的优先级。

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