Springboot获取jar包中resources资源目录下的文件

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

import java.io.File;
import java.io.IOException;

/**
 * resource资源目录专题
 * @author Stephen
 */
@SpringBootApplication
public class ResourceDemoApplication {

	public static void main(String[] args) {
//		SpringApplication.run(ResourceDemoApplication.class, args);
		try {
			//如何获取resource下的文件？【注意：即使打成jar包也得有效】
			ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
			Resource[] resources = resourcePatternResolver.getResources("classpath*:rules/**/*.*");
			for ( Resource resource : resources ) {
				//获取文件名
				System.out.println(resource.getFilename());

				//获取文件，该方式在打成jar包后会报错，因为resource文件不在系统中，而是在jar包中
				File file1 = resource.getFile();

				//获取文件，在打成jar包后，通过url来获取文件，则路径是正确的
				File file = new File(resource.getURL().getFile());

				//获取文件绝对路径，但路径有问题，因为resource文件不在系统中，而是在jar包中
//				System.out.println(file.getAbsolutePath());

				//获取文件名
				System.out.println(file.getName());
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}

		try {
			ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
			Resource[] resources = resourcePatternResolver.getResources("classpath*:rules/**/*.*");
			for ( Resource resource : resources ) {
				//获取文件，在打成jar包后，通过url来获取文件，则路径是正确的
				File file = new File(resource.getURL().getFile());
			}
		} catch (IOException e) {
			e.printStackTrace();
		}