Java IO学习笔记三

InputStreamReader

构造函数

常用方法

实例

package IO;

import java.io.*;

/**

 * Created by chenjiabing on 17-5-24.

 */

public class demo4 {

    public static void main(String args[]) {

        File file = new File("/tmp" + File.separator + "test" + File.separator + "test.txt");

        InputStreamReader inputStreamReader = null;

        try {

            inputStreamReader = new InputStreamReader(new FileInputStream(file));  //初始化

            char[] c = new char[(int) file.length()];   //创建数组

            try {

                int len = inputStreamReader.read(c);   //将内容读取到数组中

                System.out.println(len);

                for (int i = 0; i < c.length; i++) {

                    System.out.print(c[i]);

                }

            } catch (IOException e) {

                e.printStackTrace();

            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        }finally {

            if(inputStreamReader!=null)

            {

                try {

                    inputStreamReader.close();   //关闭

                }catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

        }

    }

}

OutputStreamWriter

构造函数

常用方法

实例

package IO;

import java.io.*;

/**

 * Created by chenjiabing on 17-5-24.

 */

public class demo5 {

    public static void main(String[] args)

    {

        File file=new File("/tmp"+File.separator+"test"+File.separator+"test.txt");

        OutputStreamWriter outputStreamWriter=null;

        try {

            outputStreamWriter=new OutputStreamWriter(new FileOutputStream(file,true));

            String str="陈加兵\n";

            int data=48;

            String name="chenjiabing";

            try {

                outputStreamWriter.write(str);

                outputStreamWriter.write(data);

                outputStreamWriter.write(name,0,2);   //写入字符串的一部分

            }catch (IOException e)

            {

                e.printStackTrace();

            }

        }catch (FileNotFoundException e)

        {

            e.printStackTrace();

        }finally {

            if(outputStreamWriter!=null)

            {

                try {

                    outputStreamWriter.flush();

                    outputStreamWriter.close();

                }catch (IOException e)

                {

                    e.printStackTrace();

                }

            }

        }

    }

}

参考文章