OutputStreamWriter 写作操作：

public class lpq01{
public static void main(String[]args){
try{
    OutputStreamWriter osw=new OutputStreamWriter(new FileOutputStream("F:/编程类软件/JAVA-mycode/workspace/qq.txt"));
    osw.write("lpaax001");
    System.out.println(osw.getEncoding);
    osw.close();
    osw=new OutputStreamWriter(new FileOutputStream("F:/编程类软件/JAVA-mycode/workspace/qq.txt",true),"ISO8859_1");
    osw.write("123lpq");
    System.out.println(osw.getEncoding);
    osw.close();
    }catch(IOException e){
    e.printStackTrace();
    }

}
}

InputStreamReader()读操作：

public class lpq02{
    public static void main(String[]args){
    InputStreamReader isr=new InputStreamReader(System.in);
    BufferReader br=new BufferedReader(isr);
    String s=null;
    try{
    s=br.readLine();
    while(s!=null){
    if(s.equalsIgnoreCase("exit")) break;
    System.out.println(s.toUpperCase());
    s=br.readLine();
    }
    br.close();
    }catch(IOException e){
    e.printStackTrace();
    }
    }
}