FileUtils.java

package hong.specialEffects.wight;

import java.io.File;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.InputStream;  
import java.io.OutputStream;  
  
import android.os.Environment;  
  
public class FileUtils {  
    private String SDPATH;  
      
    private int FILESIZE = 4 * 1024;   
      
    public String getSDPATH(){  
        return SDPATH;  
    }  
      
    public FileUtils(){  
        //�õ���ǰ�ⲿ�洢�豸��Ŀ¼( /SDCARD )  
        SDPATH = Environment.getExternalStorageDirectory() + "/";  
    }  
      
    /**  
     * ��SD���ϴ����ļ�  
     * @param fileName  
     * @return  
     * @throws IOException  
     */  
    public File createSDFile(String fileName) throws IOException{  
        File file = new File(SDPATH + fileName);  
        file.createNewFile();  
        return file;  
    }  
      
    /**  
     * ��SD���ϴ���Ŀ¼  
     * @param dirName  
     * @return  
     */  
    public File createSDDir(String dirName){  
        File dir = new File(SDPATH + dirName);  
        dir.mkdir();  
        return dir;  
    }  
      
    /**  
     * �ж�SD���ϵ��ļ����Ƿ����  
     * @param fileName  
     * @return  
     */  
    public boolean isFileExist(String fileName){  
        File file = new File(SDPATH + fileName);  
        return file.exists();  
    }  
      
    /**  
     * ��һ��InputStream���������д�뵽SD����  
     * @param path  
     * @param fileName  
     * @param input  
     * @return  
     */  
    public File write2SDFromInput(String path,String fileName,InputStream input){  
        File file = null;  
        OutputStream output = null;  
        try {  
            createSDDir(path);  
            file = createSDFile(path + fileName);  
            output = new FileOutputStream(file);  
            byte[] buffer = new byte[FILESIZE];  
            while((input.read(buffer)) != -1){  
                output.write(buffer);  
            }  
            output.flush();  
        }   
        catch (Exception e) {  
            e.printStackTrace();  
        }  
        finally{  
            try {  
                output.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
        return file;  
    }  
  
    /**  
     * ��һ���ַ���д�뵽SD����  
     * @param path  
     * @param fileName  
     * @param input  
     * @return  
     */  
    public File write2SDFromInput(String path,String fileName,String input){  
        File file = null;  
        OutputStream output = null;  
        try {  
            createSDDir(path);  
            file = createSDFile(path + fileName);  
            output = new FileOutputStream(file);
            output.write(input.getBytes());  
            output.flush();  
        }   
        catch (Exception e) {  
            e.printStackTrace();  
        }  
        finally{  
            try {  
                output.close();  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
        return file;  
    }
}