熊炼的个性空间和java学习之旅 — Wed, 27 Jul 2005 01:07:00 GMT

package com.xionglian.common;

import java.io.File;
import java.net.URL;
import java.io.InputStream;
import java.io.IOException;
import java.io.BufferedWriter;
import java.io.FileWriter;

/**
*

Title:

Description:

Company:

* @author 熊炼
* @version 1.0
*/

public class FileHandle
{

public FileHandle()
{
}

/**
   * filename path和URL之间的�{�?BR>   */
public void _File_URL()
{
    String path = File.separator + "a";
    System.out.println(path);
    //coverting Between a filename and a URL
    //create a file object
    File file = new File("filename");

    //covert a file object to a URL
    URL url = null;
    try
    {
      url=file.toURL();
      System.out.println(url);
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }

//convert a URL to a file object
file=new File(url.getFile());

    //read the file using the URL
    try
    {
      InputStream is=url.openStream();
      //read from the InputStream
    }
    catch(IOException e)
    {
      e.printStackTrace();
    }
}

/**
   * 从relative path到absolute path之间的�{�?BR>   */
public void rel_to_abspath()
{
    File file=new File("filename.txt");//filename.txt doesn't need exist
    file=file.getAbsoluteFile();//C:\Documents and Settings\xl\桌面\First\filename

file=new File("test"+File.separator+"filename.txt");
file=file.getAbsoluteFile();//C:\Documents and Settings\xl\桌面\First\test\filename.txt
}

/**
   * 判断两个filename path是否指向同一file
   * @return boolean
   */
public boolean isSameFile()
{
    File file1=new File("filename");
    File file2=new File("/filename");
    //file1.equals(file2)=false;
    try
    {
      //利用File.getCanonicalFile()消除多余的symbol links或�?."�?.."
      file1.getCanonicalFile();
      file2.getCanonicalFile();
    }
    catch(Exception e){}
    return file1.equals(file2);//true
}

/**
   * 创徏一个��时temporary文�g
   * @param args
   */
public void createTempFile()
{
    try
      {
        //create temporary file
        File temp = new File("temp", ".txt");
        //推出�E�序时删除temp文�g
        temp.deleteOnExit();

        //向temp文�g中写content
        BufferedWriter out = new BufferedWriter(new FileWriter(temp));
        out.write("熊炼");
        out.close();
      }
      catch(IOException e)
      {
        e.printStackTrace();
      }
}

/**
   * File、directory更名或File�U�d��到另一个位�|?BR>   * @param args
   */
public void rename_move_File()
{
    //rename a File or directory
    File file1=new File("oldname");
    File file2=new File("newname");
    file1.renameTo(file2);

    //move File
    File file=new File("filename");
    File dir=new File("directoryname");
    file.renameTo(new File(dir,file.getName()));
}

public static void main(String[] args)
{

}

熊炼的个性空间和java学习之旅 2005-07-27 09:07 发表评论

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