android 文件操作

package com.gcg.egis.utility; 
 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
 
public class FileHelper { 
     
    /**
     * 删除指定的文件
     * @param fileName
     */ 
    public static void deleteFile(String fileName){ 
        File file = new File(fileName); 
        if(file.isDirectory()){ 
            String[] files = file.list(); 
            for (int i = 0; i < files.length; i++) { 
                new File(fileName,files[i]).delete(); 
            } 
        }else{ 
            file.delete(); 
        } 
    } 
     
    /**
     * 保存指定的data内容到指定的文件中
     * @param data
     * @param fileName
     */ 
    public static void saveFile(byte[] data,String fileName){ 
        OutputStream os=null; 
        try { 
            File dir = new File(PARAM.SDCARD_PATH); 
            if(!dir.exists()){ 
                dir.mkdirs(); 
            } 
            File file = new File(fileName); 
            if(!file.exists()) 
                file.createNewFile(); 
            os = new FileOutputStream(file); 
            os.write(data, 0, data.length); 
        } catch (Exception e) { 
            e.printStackTrace(); 
        }finally{ 
            try { 
                if(os!=null){ 
                    os.close(); 
                } 
            } catch (IOException e) { 
                // TODO Auto-generated catch block  
                e.printStackTrace(); 
            } 
        } 
    } 
     
    public static byte[] readImageByte(String imagePath){ 
        byte[] tmp = new byte[4096];  
         
        ByteArrayOutputStream buffer = new ByteArrayOutputStream(); 
        InputStream in = null; 
        try { 
            in = new FileInputStream(imagePath); 
            int len; 
            while((len = in.read(tmp)) != -1){ 
                buffer.write(tmp,0,len); 
            } 
        } catch (FileNotFoundException e) { 
            e.printStackTrace(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        }finally{ 
            try { 
                if(in != null) 
                in.close(); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } 
        } 
        return  buffer.toByteArray(); 
    } 
 
} 

摘自 android小益的专栏

补充：移动开发 , Android ,