Java如何获取resources下的文件路径和创建临时文件

server:
  port: 80
  servlet:
    context-path: /JQ_Resource

String path = this.getClass().getClassLoader().getResource("xxx").getPath();

    public void getResource() {
        //1、通过Class的getResource方法
        String a1 = RescourceController.class.getResource("/cn/jq/jqresource/pojo/User.class").getPath();
        String a2 = this.getClass().getResource("../pojo/User.class").getPath();
        String a3 = RescourceController.class.getResource("/static/a.txt").getPath();
        String a4 = this.getClass().getResource("../../../../static/a.txt").getPath();
        System.out.println(a1.equals(a2)); // true
        System.out.println(a4); // /D:/JQ/workspace/JQ_Resource/target/classes/static/a.txt
 
        // 2、通过本类的ClassLoader的getResource方法
        String b1 = RescourceController.class.getClassLoader().getResource("cn/jq/jqresource/pojo/User.class").getPath();
        String b2 = this.getClass().getClassLoader().getResource("static/a.txt").getPath();
        String b3 = this.getClass().getClassLoader().getResource("static/resource/jq.docx").getPath();
 
        // 3、通过ClassLoader的getSystemResource方法
        String c1 = ClassLoader.getSystemClassLoader().getResource("cn/jq/jqresource/pojo/User.class").getPath();
        String c2 = ClassLoader.getSystemClassLoader().getResource("static/a.txt").getPath();
        String c3 = ClassLoader.getSystemClassLoader().getResource("static/resource/jq.docx").getPath();
 
        // 4、通过ClassLoader的getSystemResource方法
        String d1 = ClassLoader.getSystemResource("cn/jq/jqresource/pojo/User.class").getPath();
        String d2 = ClassLoader.getSystemResource("static/a.txt").getPath();
        String d3 = ClassLoader.getSystemResource("static/resource/jq.docx").getPath();
 
        // 5、通过Thread方式的ClassLoader的getResource方法
        String e1 = Thread.currentThread().getContextClassLoader().getResource("cn/jq/jqresource/pojo/User.class").getPath();
        String e2 = Thread.currentThread().getContextClassLoader().getResource("static/a.txt").getPath();
        String e3 = Thread.currentThread().getContextClassLoader().getResource("static/resource/jq.docx").getPath();
    }

    public void createFile(HttpServletRequest request) throws IOException {
        String contextPath = request.getContextPath(); // /JQ_Resource
 
        String filePath = contextPath + "/temp/hr.zip";
        String dirPath = contextPath + "/temp/hr";
        File file = new File(filePath);
        File dir = new File(dirPath);
        if (file.exists()) {
            // 删除指定文件，不存在报异常
            FileUtils.forceDelete(file);
        }
        file.createNewFile();
 
 
        if (dir.isDirectory()) {
            // 清除该目录下的文件及子目录文件而不删除该目录文件夹。该目录不存在会报错
            FileUtils.cleanDirectory(dir);
        } else {
            dir.mkdirs();
        }
 
        File dir_File = new File(dirPath + "/" + "dir_file.txt");
 
        System.out.println(dir_File.getPath()); // \JQ_Resource\temp\hr\dir_file.txt
        System.out.println(file.exists()); // true
    }

System.getProperty(“user.dir”)

XXX.class.getResource("").getPath()

XXX.class.getClassLoader().getResource("").getPath()

System.getProperty(“user.dir”)

File(path)与FileInputStream(path)

import java.io.UnsupportedEncodingException;  
import java.net.URI;  
import java.net.URL;  
import java.net.URLDecoder;  
  
public class Test01 {  
  
    public static void main(String[] args) {  
        getPathMethod01();  
        getPathMethod02();  
        getPathMethod03();  
        getPathMethod04();  
    }  
    private static String getPathMethod01(){  
        String p = System.getProperty("user.dir");  
        System.out.println("方法一路径："+p);  
        //方法一路径：E:\test\test04练  习
        return p;  
    }  
      
    private static String getPathMethod02(){  
        URL url= Test01.class.getResource("");  
        String p = url.getPath();  
        System.out.println("方法二路径："+p);  
		//方法二路径：/E:/test/test04%e7%bb%83%20%20%e4%b9%a0/bin/com/fei/
        try {  
            System.out.println("方法二解码路径："+URLDecoder.decode(p, "UTF-8"));  
			//方法二解码路径：/E:/test/test04练  习/bin/com/fei/
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        return p;  
    }  
      
    private static String getPathMethod03(){  
        URL url= Test01.class.getResource("/");  
        String p = url.getPath();  
        System.out.println("方法三路径："+p); 
		//方法三路径：/E:/test/test04%e7%bb%83%20%20%e4%b9%a0/bin/
        try {  
            System.out.println("方法三解码路径："+URLDecoder.decode(p, "UTF-8"));  
			//方法三解码路径：/E:/test/test04练  习/bin/
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
        return p;  
    }  
    private static String getPathMethod04(){  
        try {  
            URI uri = Test01.class.getResource("/").toURI();  
            String p = uri.getPath();  
            System.out.println("方法四路径："+p);  
			//方法四路径：/E:/test/test04练  习/bin/
            return p;  
        } catch (Exception e) {  
            e.printStackTrace();  
            throw new RuntimeException(e);  
        }  
    }  
}