package com.shuzf.fileio;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

import java.io.Reader;

/**

 * 字符输入流的操作

 */

public class FileReaderDemo {

    // 读取文件的方式一：逐个字符来读取文本文件

    public void getChar1(Reader reader) throws IOException {

        //定义保存数据的变量

        int data;

        while ((data = reader.read()) != -1) {

            System.out.print((char) data);

        }

    }

    // 读取文件方式二：使用数组来读取文本文件

    public void getChar2(Reader reader) throws IOException {

        //定义保存读取数据的字符数组

        char[] buf = new char[1024];

        //定义表示一次读取到字符数组中的数据长度

        int data;

        while ((data = reader.read(buf)) != -1) {

            System.out.println(new String(buf, 0, data));

        }

    }

    // 方法三：用缓冲区读取文本文件

    public void getChar3(Reader reader) throws IOException {

        //定义缓冲流

        BufferedReader buf = new BufferedReader(reader);

        String str;

        while ((str = buf.readLine()) != null) {

            System.out.println(str);

        }

    }

    public static void main(String[] args) {

        FileReaderDemo demo = new FileReaderDemo();

        FileReader reader = null;

        try {

            reader = new FileReader("src/files/test1.txt");

            demo.getChar1(reader);

            //demo.getChar2(reader);

            //demo.getChar3(reader);

        } catch (FileNotFoundException e) {

            System.out.println("异常：" + e.toString());

        } catch (IOException e) {

            System.out.println("异常：" + e.toString());

        } finally {

            if (reader != null) {

                try {

                    reader.close();

                } catch (IOException e) {

                    System.out.println("异常：" + e.toString());

                }

            }

        }

    }

}

package com.shuzf.fileio;

import java.io.FileWriter;

import java.io.IOException;

import java.io.Writer;

/**

 * 字符输出流

 */

public class FileWriterDemo {

    public static void main(String[] args) {

        Writer writer = null;

        try {

            writer = new FileWriter("src/files/test3.txt");

            writer.write("hello world\n");

            writer.write(new char[] { '大', '家', '好', '\n' });

            writer.write(97);

            writer.append('a').append('b').append('c').write("sdfdsf");

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            if (writer != null) {

                try {

                    writer.flush();

                    writer.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

    }

}