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                ~~~ package com.example.filerw; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintStream; import java.io.RandomAccessFile; import java.net.URL; import org.apache.http.util.EncodingUtils; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Environment; public class FileUtil { private Context context; public FileUtil(Context context) { this.context=context; } /** * 讀取data/data/<package name>/files 目錄下的文件 * @param fileName * @return */ public String readFromData(String fileName) { try { FileInputStream fis =context.openFileInput(fileName); //圖片如此操作 //InputStream in = new BufferedInputStream(fis); //Bitmap bitmap= BitmapFactory.decodeStream(in); byte[]buff =new byte[1024]; int hasRead=0; StringBuilder sb =new StringBuilder(""); while((hasRead=fis.read(buff))>0) { sb.append(new String(buff,0,hasRead)); } fis.close(); return sb.toString(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } /** * 將數據寫入data/data/<package name>/files 目錄下的文件 * @param content * @param fileName * @param mode */ public void writeToData(String content,String fileName,int mode) { try { FileOutputStream fos =context.openFileOutput(fileName, mode); PrintStream ps =new PrintStream(fos); ps.println(content); ps.close(); } catch (Exception e) { // TODO: handle exception } } /** * 讀取SD卡 目錄下的文件 * @param fileName * @return */ public String readFromSDCard(String fileName) { try { //檢測SD卡是否存在 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File sdCardDir = Environment.getExternalStorageDirectory(); FileInputStream fis =new FileInputStream(sdCardDir.getCanonicalPath()+"/"+fileName); BufferedReader br =new BufferedReader(new InputStreamReader(fis)); StringBuilder sb =new StringBuilder(""); String line=null; while((line =br.readLine())!=null) { sb.append(line); } br.close(); return sb.toString(); } } catch (Exception e) { // TODO: handle exception } return null; } /** * 接著寫入SD卡目錄下的文件 追加內容 * @param content * @param FileName * @param mode */ public void writeToSDCard(String content,String FileName,String mode) { try { //檢測SD卡是否存在 if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File sdCardDir = Environment.getExternalStorageDirectory(); File targetFile =new File(sdCardDir.getCanonicalPath()+"/"+FileName); RandomAccessFile raf =new RandomAccessFile(targetFile,mode); raf.seek(targetFile.length()); raf.write(content.getBytes()); raf.close(); } } catch (Exception e) { // TODO: handle exception } } /** * fileName可以是路徑加文件名 * 必須先檢測SD卡是否存在 * @param fileName * @return * @throws IOException */ public String readSDFile(String fileName) throws IOException { if(isSDCardExists()) { File file = new File(fileName); FileInputStream fis = new FileInputStream(file); //如果是圖片可以這樣得到BitMap // InputStream is = new BufferedInputStream(fis); // Bitmap bitmap = BitmapFactory.decodeStream(is); int length = fis.available(); byte [] buffer = new byte[length]; fis.read(buffer); String res = EncodingUtils.getString(buffer, "UTF-8"); fis.close(); return res; } else { return null; } } /** * 必須先檢測SD卡是否存在 * fileName可以是路徑加文件名 * @param fileName * @param write_str * @throws IOException */ public void writeSDFile(String fileName, String write_str) throws IOException { if(isSDCardExists()) { File file = new File(fileName); FileOutputStream fos = new FileOutputStream(file); byte [] bytes = ((String) write_str).getBytes(); fos.write(bytes); fos.close(); } } /** * 獲取網絡資源 * 圖片 文件 。。。 * @throws IOException */ public void writeToSDFromURL(String s,String fileName) throws IOException { if(isSDCardExists()) { URL url =new URL(s); InputStream is =url.openStream(); //轉化為Bitmap //Bitmap bitmap =BitmapFactory.decodeStream(is); String path = Environment.getExternalStorageDirectory().getAbsolutePath(); File file =new File(path+"/"+fileName); FileOutputStream fop= new FileOutputStream(file); OutputStream os = new BufferedOutputStream(fop); //若寫入到DATA中就如下做 //OutputStream os=context.openFileOutput(fileName, context.MODE_WORLD_READABLE); byte [] buff=new byte[1024]; int hasRead=0; while((hasRead=is.read(buff))>0) { os.write(buff,0,hasRead); } is.close(); os.close(); } } public boolean isSDCardExists() { try { String s= Environment.getExternalStorageDirectory().getCanonicalPath(); if(new File(s).exists()) return true; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); return false; } return false; } //有關SD卡讀寫都要加上讀寫權限 //<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> //<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /> // String Name = File.getName(); //獲得文件或文件夾的名稱: // String parentPath = File.getParent(); //獲得文件或文件夾的父目錄 // String path = File.getAbsoultePath();//絕對路經 // String path = File.getPath();//相對路經 // File.createNewFile();//建立文件 // File.mkDir(); //建立文件夾 // File.isDirectory(); //判斷是文件或文件夾 // File[] files = File.listFiles(); //列出文件夾下的所有文件和文件夾名 // File.renameTo(dest); //修改文件夾和文件名 // File.delete(); //刪除文件夾或文件 } ~~~ 文件讀寫總結: SD卡中的文件使用FileInputStream和FileOutputStream進行文件的操作。 存放在數據區(/data/data/..)的文件只能使用openFileOutput和openFileInput進行操作,不能使用FileInputStream和FileOutputStream進行文件的操作。 文件操作的一些方法: String Name = File.getName();? //獲得文件或文件夾的名稱: ? String parentPath = File.getParent();? //獲得文件或文件夾的父目錄 ? String path = File.getAbsoultePath();//絕對路經 ? String path = File.getPath();//相對路經? ? File.createNewFile();//建立文件?? ? File.mkDir(); //建立文件夾?? ? File.isDirectory(); //判斷是文件或文件夾 ? File[] files = File.listFiles();? //列出文件夾下的所有文件和文件夾名 ? File.renameTo(dest);? //修改文件夾和文件名 ? File.delete();? //刪除文件夾或文件 ?
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