Java-IO（二）

 一、Bufferedwriter

public class BufferedwriterDemo {
    public static void main(String[] args) {
        FileWriter fileWriter=null;
        BufferedWriter bufferedWriter=null;

        try {
            fileWriter=new FileWriter("d3.txt");
            bufferedWriter=new BufferedWriter(fileWriter);
            bufferedWriter.write(101);
            bufferedWriter.write("www.baidu.cao百度".toCharArray());
            //写入一个换行
            bufferedWriter.newLine();
            bufferedWriter.write("今天天气不错");
            bufferedWriter.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            bufferedWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        try {
            fileWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

 二、BufferedReader

public class BufferedReaderDemo {
    public static void main(String[] args) {
        FileReader fileReader=null;
        BufferedReader reader=null;//一次读一行
        try {
            fileReader=new FileReader("c3.txt");
            reader=new BufferedReader(fileReader);
//            int length=0;
//            char[]chars=new char[1024];
//            while ((length=reader.read(chars))!=1){
//                System.out.println(new String (chars,0,length));
//            }
//            String s=reader.readLine();
//            System.out.println(s);
            //一次读一行
            String str="";
            while ((str=reader.readLine())!=null){
                System.out.println(str);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {
            fileReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}