java基础-文件路径

获取文件路径，有三种方式，哪种靠谱些，我们看看下面的测试。

 

包的结构

 

test.txt内容

sasdfasdf
 

 

public class TestPath {
	public static void main(String[] args) {
		String cps = "/lujing/test.txt"; 
		
		File f1 = new File("src/lujing/test.txt");
		System.out.println("f1:"+f1.canRead());
		System.out.println("f1:"+f1.getPath());
		System.out.println("f1:"+f1.length());

		System.out.println("================");
		File f2 = new File("D://myeclipse-workspace//TestAll//src//lujing//test.txt");
		System.out.println("f2:"+f2.canRead());
		System.out.println("f2:"+f2.getPath());
		System.out.println("f2:"+f2.length());
		
		System.out.println("================");
		File f3 = new File(TestPath.class.getResource(cps).getFile());
		System.out.println("f3:"+f3.canRead());
		System.out.println("f3:"+f3.getPath());
		System.out.println("f3:"+f3.length());
	}
}

 

我们在eclipse下面的执行结果

f1:true
f1:src\lujing\test.txt
f1:9
================
f2:true
f2:D:\myeclipse-workspace\TestAll\src\lujing\test.txt
f2:9
================
f3:true
f3:D:\myeclipse-workspace\TestAll\bin\lujing\test.txt
f3:9

 

我们在命令行下面的执行结果

D:\myeclipse-workspace\TestAll\src>javac lujing/TestPath.java
D:\myeclipse-workspace\TestAll\src>java lujing/TestPath
f1:false
f1:src\lujing\test.txt
f1:0
================
f2:true
f2:D:\myeclipse-workspace\TestAll\src\lujing\test.txt
f2:9
================
f3:true
f3:D:\myeclipse-workspace\TestAll\src\lujing\test.txt
f3:9

 

实践证明，采用绝对路径的写法靠谱些。