.apache.commons.io 源代码学习（一）
import java.io.File;import java.io.IOException;
import org.apache.commons.io.FileSystemUtils;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.LineIterator;
import org.apache.commons.io.IOCase;
public final>// We are using the file exampleTxt.txt in the folder ExampleFolder,// and we need to provide the full path to the Utility>private static final String EXAMPLE_TXT_PATH = "C:UsersLilykosworkspaceApacheCommonsExampleExampleFolderexampleTxt.txt";
private static final String PARENT_DIR =
"C:UsersLilykosworkspaceApacheCommonsExample";
public static void runExample() throws IOException {
System.out.println("Utility> // FilenameUtils
System.out.println("Full path of exampleTxt: " +
FilenameUtils.getFullPath(EXAMPLE_TXT_PATH));
System.out.println("Full name of exampleTxt: " +
FilenameUtils.getName(EXAMPLE_TXT_PATH));
System.out.println("Extension of exampleTxt: " +
FilenameUtils.getExtension(EXAMPLE_TXT_PATH));
System.out.println("Base name of exampleTxt: " +
FilenameUtils.getBaseName(EXAMPLE_TXT_PATH));
// FileUtils
// We can create a new File object using FileUtils.getFile(String)
// and then use this object to get information from the file.
File exampleFile = FileUtils.getFile(EXAMPLE_TXT_PATH);
LineIterator iter = FileUtils.lineIterator(exampleFile);
System.out.println("Contents of exampleTxt...");
while (iter.hasNext()) {
System.out.println("t" + iter.next());
}
iter.close();
// We can check if a file exists somewhere inside a certain directory.
File parent = FileUtils.getFile(PARENT_DIR);
System.out.println("Parent directory contains exampleTxt file: " +
FileUtils.directoryContains(parent, exampleFile));
// IOCase
String str1 = "This is a new String.";
String str2 = "This is another new String, yes!";
System.out.println("Ends with string (case sensitive): " +
IOCase.SENSITIVE.checkEndsWith(str1, "string."));
System.out.println("Ends with string (case insensitive): " +
IOCase.INSENSITIVE.checkEndsWith(str1, "string."));
System.out.println("String equality: " +
IOCase.SENSITIVE.checkEquals(str1, str2));
// FileSystemUtils
System.out.println("Free disk space (in KB): " + FileSystemUtils.freeSpaceKb("C:"));
System.out.println("Free disk space (in MB): " + FileSystemUtils.freeSpaceKb("C:") / 1024);
}
}
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