总结

获取路径：获取的是项目目录, System.getProperty("user.dir"), file.getCanonicalFile()
获取资源：获取的是resources目录下的资源, class.getResourceAsStream("/xcrj-resources.txt"), class.getClassLoader().getResourceAsStream("xcrj-resources.txt")

代码

package com.xcrj.path;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;

public class PathMain {

    public static void main(String[] args) throws IOException {
        // G:\micro-service\springbootbasic
        System.out.println(System.getProperty("user.dir"));

        // 设置为当前文件夹
        File file = new File("");
        // 标准路径，G:\micro-service\springbootbasic
        System.out.println(file.getCanonicalFile());
        // 绝对路径，G:\micro-service\springbootbasic
        System.out.println(file.getAbsolutePath());
        // 类的绝对路径，/G:/micro-service/springbootbasic/target/classes/
        System.out.println(PathMain.class.getResource("/").getPath());

        // resources/xcrj-resources.txt
        InputStream is = PathMain.class.getResourceAsStream("/xcrj-resources.txt");
        byte[] buf = new byte[is.available()];
        is.read(buf);
        System.out.println(new String(buf, Charset.forName("UTF-8")));

        // resources/xcrj-resources.txt
        InputStream is1 = PathMain.class.getClassLoader().getResourceAsStream("xcrj-resources.txt");
        byte[] buf2 = new byte[is1.available()];
        is1.read(buf2);
        System.out.println(new String(buf2, Charset.forName("UTF-8")));
    }
}

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