Java 7如何操縱文件屬性

jopen 10年前發布 | 12K 次閱讀 Java Java開發
本文介紹如何利用Java 7的NIO包讀取文件屬性以及修改文件屬性。詳情如下：
1、讀取文件屬性

    import java.io.IOException;

    import java.nio.file.Files;

    import java.nio.file.Path;

    import java.nio.file.Paths;

    import java.nio.file.attribute.BasicFileAttributes;

    import java.util.logging.Level;

    import java.util.logging.Logger;

public class ReadFileAttribute1 {  
    public static void main(String[] args){  
        Path filePath = Paths.get("d:\\test.txt");  
        try{  
            BasicFileAttributes ra = Files.readAttributes(filePath, BasicFileAttributes.class);  
            System.out.println("CREATION TIME:" + ra.creationTime());  
            System.out.println("LAST ACCESS TIME:" + ra.lastAccessTime());  
            System.out.println("FILE SIZE:" + ra.size());  
            System.out.println("LAST MODIFIED:" + ra.lastModifiedTime());  
            System.out.println("IS SYSBOLIC LINK:" + ra.isSymbolicLink());  
            System.out.println("IS FOLDER:" + ra.isDirectory());  
            System.out.println("IS FILE:" + ra.isRegularFile());  

        }catch(IOException e){  
            Logger.getLogger(ReadFileAttribute1.class.getName()).log(Level.SEVERE, null, e);  
        }  
    }  
}  </pre><a href="/misc/goto?guid=4959549888304587357" target="_blank" title="派生到我的代碼片" style="text-indent:0;"></a></div>

</div>
</div>
輸出：

CREATION TIME:2013-04-09T05:45:30.685152Z

LAST ACCESS TIME:2013-08-12T00:30:43.19369Z

FILE SIZE:32

LAST MODIFIED:2013-12-10T13:35:08.438828Z

IS SYSBOLIC LINK:false

IS FOLDER:false

IS FILE:true

2、另一種讀取文件屬性的方法


</div>
</div>
    import java.io.IOException;

    import java.nio.file.Files;

    import java.nio.file.Path;

    import java.nio.file.Paths;

    import java.util.logging.Level;

    import java.util.logging.Logger;

public class ReadFileAttribute2 {  
    public static void main(String[] args){  
        Path fp = Paths.get("D:\\test.txt");  
        try{  
            Files.getAttribute(fp, "basic:size");  
            System.out.println("CREATION TIME:" + Files.getAttribute(fp, "basic:creationTime").toString());  
            System.out.println("LAST ACCESS TIME:" + Files.getAttribute(fp, "basic:lastAccessTime").toString());  
            System.out.println("FILE SIZE:" + Files.getAttribute(fp, "basic:size").toString());  
            System.out.println("LAST MODIFIED:" + Files.getAttribute(fp, "basic:lastModifiedTime").toString());  
            System.out.println("IS SYSBOLIC LINK:" + Files.getAttribute(fp, "basic:isSymbolicLink").toString());  
            System.out.println("IS FOLDER:" + Files.getAttribute(fp, "basic:isDirectory").toString());  
            System.out.println("IS FILE:" + Files.getAttribute(fp, "basic:isRegularFile").toString());  
        }catch(IOException e){  
            Logger.getLogger(ReadFileAttribute2.class.getName()).log(Level.SEVERE, null, e);  
        }  

    }  
}  </pre><br />

輸出：CREATION TIME:2013-04-09T05:45:30.685152Z

LAST ACCESS TIME:2013-08-12T00:30:43.19369Z

FILE SIZE:32

LAST MODIFIED:2013-12-10T13:35:08.438828Z

IS SYSBOLIC LINK:false

IS FOLDER:false

IS FILE:true

3、修改文件屬性

    import java.io.IOException;

    import java.nio.file.Files;

    import java.nio.file.Path;

    import java.nio.file.Paths;

    import java.nio.file.attribute.BasicFileAttributes;

    import java.nio.file.attribute.FileTime;

    import java.util.logging.Level;

    import java.util.logging.Logger;

public class UpdateFileAttribute1 {  
    public static void main(String[] args){  
        Path fp = Paths.get("D:\\test.txt");  
        try{  
            BasicFileAttributes ra = Files.readAttributes(fp, BasicFileAttributes.class);  
            long currentTimeMillis = System.currentTimeMillis();  
            FileTime fileTime = FileTime.fromMillis(currentTimeMillis);  
            Files.setAttribute(fp, "basic:creationTime", fileTime);  
            FileTime creationTime = (FileTime)Files.getAttribute(fp, "basic:creationTime");  
            System.out.println("NEW CREATION TIME:" + creationTime.toString());  
            System.out.println("OLD CREATION TIME:" + ra.creationTime());  
        }catch(IOException e){  
            Logger.getLogger(UpdateFileAttribute1.class.getName()).log(Level.SEVERE, null, e);  
        }  
    }  
}  </pre><a href="/misc/goto?guid=4959549888304587357" target="_blank" title="派生到我的代碼片" style="text-indent:0;"></a></div>

</div>
</div>
輸出：
NEW CREATION TIME:2013-12-10T15:04:26.159Z

OLD CREATION TIME:2013-04-09T05:45:30.685152Z

4、還可以修改文件別的屬性

    import java.io.IOException;

    import java.nio.file.Files;

    import java.nio.file.Path;

    import java.nio.file.Paths;

    import java.nio.file.attribute.BasicFileAttributes;

    import java.nio.file.attribute.FileTime;

    import java.util.logging.Level;

    import java.util.logging.Logger;

public class UpdateFileAttribute2 {  
    public static void main(String[] args){  
        Path fp = Paths.get("D:\\test.txt");  
        try{  
            BasicFileAttributes ra = Files.readAttributes(fp, BasicFileAttributes.class);  
            long currentTimeMillis = System.currentTimeMillis();  
            FileTime fileTime = FileTime.fromMillis(currentTimeMillis);  
            Files.setAttribute(fp, "basic:lastAccessTime", fileTime);  
            FileTime creationTime = (FileTime)Files.getAttribute(fp, "basic:lastAccessTime");  
            System.out.println("NEW LAST-ACCESS-TIME:" + creationTime.toString());  
            System.out.println("OLD LAST-ACCESS-TIME:" + ra.lastAccessTime());  
        }catch(IOException e){  
            Logger.getLogger(UpdateFileAttribute2.class.getName()).log(Level.SEVERE, null, e);  
        }  
    }  
}  </pre><a href="/misc/goto?guid=4959549888304587357" target="_blank" title="派生到我的代碼片" style="text-indent:0;"></a></div>

</div>
</div>
輸出：
NEW LAST-ACCESS-TIME:2013-12-10T15:07:46.261Z

OLD LAST-ACCESS-TIME:2013-08-12T00:30:43.19369Z

5、另一種修改文件屬性的方法

    import java.io.IOException;

    import java.nio.file.Files;

    import java.nio.file.Path;

    import java.nio.file.Paths;

    import java.nio.file.attribute.BasicFileAttributes;

    import java.nio.file.attribute.FileTime;

    import java.util.logging.Level;

    import java.util.logging.Logger;

public class UpdateFileAttribute3 {  
    public static void main(String[] args){  
        Path fp = Paths.get("D:\\test.txt");  
        try{  
            BasicFileAttributes ra = Files.readAttributes(fp, BasicFileAttributes.class);  
            long currentTimeMillis = System.currentTimeMillis();  
            FileTime fileTime = FileTime.fromMillis(currentTimeMillis);  
            Files.setLastModifiedTime(fp, fileTime);  
            FileTime time = (FileTime)Files.getAttribute(fp, "basic:lastModifiedTime");  
            System.out.println("NEW LAST-MODIFIED-TIME:" + time.toString());  
            System.out.println("OLD LAST-MODIFIED-TIME:" + ra.lastModifiedTime());  
        }catch(IOException e){  
            Logger.getLogger(UpdateFileAttribute3.class.getName()).log(Level.SEVERE, null, e);  
        }  
    }  
}  </pre><a href="/misc/goto?guid=4959549888304587357" target="_blank" title="派生到我的代碼片" style="text-indent:0;"></a></div>

</div>
</div>
輸出：

NEW LAST-MODIFIED-TIME:2013-12-10T15:13:07.134Z

OLD LAST-MODIFIED-TIME:2013-12-10T13:35:08.438828Z



來自：http://blog.csdn.net/chszs/article/details/17252977



                    
                    
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