.apache.commons.io 源代码学习（一）

gxh1968

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);
　　}
　　
}