files/PathInfo.java · ThisYoung/OnJava8-Examples

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OnJava8-Examples

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PathInfo.java

PathInfo.java 2.56 KB

// files/PathInfo.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.nio.file.*;
import java.net.URI;
import java.io.File;
import java.io.IOException;

public class PathInfo {
 static void show(String id, Object p) {
 System.out.println(id + ": " + p);
 }
 static void info(Path p) {
 show("toString", p);
 show("Exists", Files.exists(p));
 show("RegularFile", Files.isRegularFile(p));
 show("Directory", Files.isDirectory(p));
 show("Absolute", p.isAbsolute());
 show("FileName", p.getFileName());
 show("Parent", p.getParent());
 show("Root", p.getRoot());
 System.out.println("******************");
 }
 public static void main(String[] args) {
 System.out.println(System.getProperty("os.name"));
 info(Paths.get(
 "C:", "path", "to", "nowhere", "NoFile.txt"));
 Path p = Paths.get("PathInfo.java");
 info(p);
 Path ap = p.toAbsolutePath();
 info(ap);
 info(ap.getParent());
 try {
 info(p.toRealPath());
 } catch(IOException e) {
 System.out.println(e);
 }
 URI u = p.toUri();
 System.out.println("URI: " + u);
 Path puri = Paths.get(u);
 System.out.println(Files.exists(puri));
 File f = ap.toFile(); // Don't be fooled
 }
}
/* Output:
Windows 10
toString: C:\path\to\nowhere\NoFile.txt
Exists: false
RegularFile: false
Directory: false
Absolute: true
FileName: NoFile.txt
Parent: C:\path\to\nowhere
Root: C:\
******************
toString: PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: false
FileName: PathInfo.java
Parent: null
Root: null
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files\PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: true
FileName: PathInfo.java
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Root: C:\
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Exists: true
RegularFile: false
Directory: true
Absolute: true
FileName: files
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples
Root: C:\
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files\PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: true
FileName: PathInfo.java
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Root: C:\
******************
URI: file:///C:/Users/Bruce/Documents/GitHub/on-
java/ExtractedExamples/files/PathInfo.java
true
*/

一键复制编辑原始数据按行查看历史

Bruce Eckel 提交于 2017年05月11日 01:45 +08:00 . Narrowed listing widths, fixed output

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102

// files/PathInfo.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.nio.file.*;
import java.net.URI;
import java.io.File;
import java.io.IOException;

public class PathInfo {
 static void show(String id, Object p) {
 System.out.println(id + ": " + p);
 }
 static void info(Path p) {
 show("toString", p);
 show("Exists", Files.exists(p));
 show("RegularFile", Files.isRegularFile(p));
 show("Directory", Files.isDirectory(p));
 show("Absolute", p.isAbsolute());
 show("FileName", p.getFileName());
 show("Parent", p.getParent());
 show("Root", p.getRoot());
 System.out.println("******************");
 }
 public static void main(String[] args) {
 System.out.println(System.getProperty("os.name"));
 info(Paths.get(
 "C:", "path", "to", "nowhere", "NoFile.txt"));
 Path p = Paths.get("PathInfo.java");
 info(p);
 Path ap = p.toAbsolutePath();
 info(ap);
 info(ap.getParent());
 try {
 info(p.toRealPath());
 } catch(IOException e) {
 System.out.println(e);
 }
 URI u = p.toUri();
 System.out.println("URI: " + u);
 Path puri = Paths.get(u);
 System.out.println(Files.exists(puri));
 File f = ap.toFile(); // Don't be fooled
 }
}
/* Output:
Windows 10
toString: C:\path\to\nowhere\NoFile.txt
Exists: false
RegularFile: false
Directory: false
Absolute: true
FileName: NoFile.txt
Parent: C:\path\to\nowhere
Root: C:\
******************
toString: PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: false
FileName: PathInfo.java
Parent: null
Root: null
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files\PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: true
FileName: PathInfo.java
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Root: C:\
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Exists: true
RegularFile: false
Directory: true
Absolute: true
FileName: files
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples
Root: C:\
******************
toString: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files\PathInfo.java
Exists: true
RegularFile: true
Directory: false
Absolute: true
FileName: PathInfo.java
Parent: C:\Users\Bruce\Documents\GitHub\on-
java\ExtractedExamples\files
Root: C:\
******************
URI: file:///C:/Users/Bruce/Documents/GitHub/on-
java/ExtractedExamples/files/PathInfo.java
true
*/