Java中的文件路径

package com.rock.test.filePath;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class FilePathTest {

    public static void main(String[] args) {
        //使用文件相对路径
        File file1 = new File("test1.txt");
        System.out.println("test1.txt exists " + file1.exists());
        
        File file2 = new File("src\\test2.txt");
        System.out.println("test2.txt exists " + file2.exists());
        
        File file3 = new File("src\\com\\rock\\test\\filePath\\test3.txt");
        System.out.println("test3.txt exists " + file3.exists());
        
        
        
        InputStream stream = FilePathTest.class.getResourceAsStream("/test2.txt");
//        InputStream stream = FilePathTest.class.getResourceAsStream("test3.txt");
//        InputStream stream = FilePathTest.class.getClassLoader().getResourceAsStream("test2.txt");
        BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
        String line = null;
        try {
            while((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        
        //使用类加载路径获取test2.txt
        File file2ByLoard = new File(FilePathTest.class.getResource("/").getPath() + "\\test2.txt");
        System.out.println("test2.txt exists by load " + file2ByLoard.exists());
        
        File file2ByLoarder = new File(FilePathTest.class.getClassLoader().getResource("").getPath() + "\\test2.txt");
        System.out.println("test2.txt exists by loader " + file2ByLoarder.exists());
    
        File file2ByClasspath = new File(System.getProperty("java.class.path") + "\\test2.txt");
        System.out.println("test2.txt exists by Classpath " + file2ByClasspath.exists());
    
    }

}