文件读写操作汇总解析

本文主要是介绍文件读写操作汇总解析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

转载博客：http://www.cnblogs.com/lianghui66/archive/2013/09/05/3303546.html

InputStream 字节流输入类，读取byte数组

Reader 字符流读取类，读取Char数组和String对象

FileInputStream 文件输入字节流

BufferedReader 带缓冲的字符流读取

InputStreamReader j将字节流转换为字符流的一个类，构造方法的参数是字节输入流

FileReader 继承InputStreamReader类，构造方法的参数是文件对象或者文件路径名称

用FileInputStream(FileOutputStream)读写文件

public void write(String fileName,String writeString) throws Exception{
try{FileOutputStream fout=openFileOutput(fileName,MODE_PRIVATE);byte[] bytes=writeString.getBytes();fout.write(bytes);fout.close();}catch(Exception e){e.printStackTrace();}
}public String read(String fileName){
String res=“”;
try{FileInputStream fin=openFileInput(fileName,MODE_PRIVATE);int length=fin.available();byte[] buffer=new byte[length];fin.read(buffer);res=EncodingUtils.getString(buffer,”UTF-8”);fin.close();}catch(Exception e){e.printStackTrace();}
return res;
}

用BufferedReader和FileReader读文件

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.File;
import android.util.Log;private String getCoulometerValue(String batterypath){String procElectricityStr;try{BufferedReader reader=new BufferedReader(new FileReader(batterypath),256);try{procElectricityStr=reader.readLine();}finally{reader.close();}return procElectricityStr;}catch(IOException e){e.printStackTrace();return “Unavailable”;}
}

用BufferedReader,InputStreamReader,FileInputStream（BufferedWriter,OutputStreamWriter,FileOutputStream）读写文件

public String load(String fileName){FileInputStream in=null;BufferedReader reader=null;StringBuilder content=new StringBulider();try{in=openFileInput(fileName);reader=new BufferedReader(new InputStreamReader(in));String line=””;while((line=reader.readLine())!=null){content.append(line);}}catch(IOException e){e.printStackTrace()}finally{if(reader!=null)try{reader.close()}catch(IOException e){e.printStackTrace();}}}return content.toString();
}

public void Save(String fileName,String data){FileOutputStream out=null;BufferedWriter writer=null;try{out=openFileOutput(fileName,Context.MODE_PRIVATE);writer=new BufferedWriter(new OutputStreamWriter(out));writer.write(data);}catch(IOException e){e.printStackTrace();}finally{if(writer!=null){writer.close();}catch(IOException){e.printStackTrace();}}
}

字符串->文件对象->字节流对象->字符流对象

输出->写

输入->读

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