今天复习一下文件读取

来源：互联网发布：统赢编程教程编辑：程序博客网时间：2024/06/05 21:07
自己整理写的一个文件读取类，可以读取和写入
public class FileService {    public Context context;    public FileService(Context context) {        this.context = context;    }    public void saveToSDCard(String filename,String content){        File file = new File(Environment.getExternalStorageDirectory(),filename);        FileOutputStream fileOutputStream = null;        try {             fileOutputStream = new FileOutputStream(file);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public void save(String filename,String content){        FileOutputStream fileOutputStream = null;        try {             fileOutputStream = context.openFileOutput(filename,Context.MODE_PRIVATE);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public void saveAppend(String filename,String content){       FileOutputStream fileOutputStream = null;        try {            fileOutputStream = context.openFileOutput(filename,Context.MODE_APPEND);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public void saveWriteable(String filename,String content){        FileOutputStream fileOutputStream = null;        try {            fileOutputStream = context.openFileOutput(filename,Context.MODE_WORLD_WRITEABLE);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public void saveReadable(String filename,String content){        FileOutputStream fileOutputStream = null;        try {            fileOutputStream = context.openFileOutput(filename,Context.MODE_WORLD_READABLE);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public void saveRW(String filename,String content){        FileOutputStream fileOutputStream = null;        try {            fileOutputStream = context.openFileOutput(filename,Context.MODE_WORLD_WRITEABLE+Context.MODE_WORLD_READABLE);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        try {            fileOutputStream.write(content.getBytes());        } catch (IOException e) {            e.printStackTrace();        }        try {            fileOutputStream.close();        } catch (IOException e) {            e.printStackTrace();        }    }    public String read(String filename){        FileInputStream fileInputStream = null;        try {             fileInputStream = context.openFileInput(filename);        } catch (FileNotFoundException e) {            e.printStackTrace();        }        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();        byte byteArray[] = new byte[1024];        int len = 0;        try {            while((len = fileInputStream.read(byteArray))!=-1){                byteArrayOutputStream.write(byteArray,0,len);            }        } catch (IOException e) {            e.printStackTrace();        }        String content = new String(byteArray);        return content;    }}
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