四种节点流和Buffered的使用

来源：互联网发布：过程控制软件编辑：程序博客网时间：2024/06/08 07:22

1、FileInputStream的使用

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class TestFileInputOutputStream {    /**     * 从硬盘中读取一个文件内容到程序中     * */    public static void main(String[] args) {        String counte = "河南理工大学";//      testFileInputStream1();//      testFileInputStream2();//      testFileInputStream3(counte);        long start = System.currentTimeMillis();        testFileInputOutputStream();        long end = System.currentTimeMillis();        System.out.println(end - start);    }    //复制文件    public static void testFileInputOutputStream(){        File file1 = new File("C:\\Users\\Administrator\\Desktop\\music.rar");        File file2 = new File("C:\\Users\\Administrator\\Desktop\\DEF.rar");        FileInputStream fis = null;        FileOutputStream fos = null;        try {            fis = new FileInputStream(file1);            fos = new FileOutputStream(file2);            byte[] b = new byte[1024];            int len;            while((len = fis.read(b)) != -1){                fos.write(b, 0, len);            }            fis.close();            fos.close();          } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public static void testFileInputStream3(String counte){        //输出        File file = new File("C:\\Users\\Administrator\\Desktop\\DEF.txt");        try {            FileOutputStream fos = new FileOutputStream(file);            fos.write(counte.getBytes());            fos.close();        } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    public static void testFileInputStream2(){        //使用数组        File file = new File("C:\\Users\\Administrator\\Desktop\\ABC.txt");        try {            FileInputStream fis = new FileInputStream(file);            byte[] b = new byte[5];//读取到的数据             int len;            try {                while((len = fis.read(b)) != -1){//                  for (int i = 0; i < len; i++) {//                      System.out.print((char)b[i]);//                  }                    String st = new String(b, 0, len);                    System.out.print(st);                }                fis.close();            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    /**     * 以字节方式读取文件（），并输出到控制台     * */    public static void testFileInputStream1(){        File file = new File("C:\\Users\\Administrator\\Desktop\\ABC.txt");        try {            FileInputStream fis = new FileInputStream(file);            //3、调用FileIn普通Stream的方法            int b = fis.read();            while (b != -1) {                System.out.print((char)b);                b = fis.read();            }            fis.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }}

2、FileOutputStream的使用

import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class TestFileReaderWriter {    public static void main(String[] args) {//      testFileReader();        testFileReaderWriter();    }    /**     * 复制文本文件     * */    public static void testFileReaderWriter(){        FileReader fr = null;        FileWriter fw = null;        File file1 = new File("C:\\Users\\Administrator\\Desktop\\123.txt");        File file2 = new File("C:\\Users\\Administrator\\Desktop\\456.txt");        try {            fr = new FileReader(file1);            fw = new FileWriter(file2);            char[] c = new char[1024];            int len;            while((len = fr.read(c)) != -1){                fw.write(c, 0, len);            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }  catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            if (fw != null) {                try {                    fw.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            if (fr != null) {                try {                    fr.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }    /**     * 读取文本文件     * */    public static void testFileReader(){        File file = new File("C:\\Users\\Administrator\\Desktop\\123.txt");        FileReader fr = null;        try {            fr = new FileReader(file);            char[] c = new char[1024];            int len;            while((len = fr.read(c)) != -1){                String str = new String(c, 0, len);                System.out.println(str);            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            if (fr != null) {                try {                    fr.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }}

3、FileReaderWriter的使用

import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class TestBufferedInputOutputStream {    /**     * 缓冲流     * BufferedInputStream     * BufferedOutputStream     * BufferedReader     * BufferedWriter     */    public static void main(String[] args) {//      testBufferedInputOutputStream();//      testBufferedReaderWriter();        testBufferedReaderWriter2();    }    //缓冲流  文本文件的复制    public static void testBufferedReaderWriter2(){        File file1 = new File("C:\\Users\\Administrator\\Desktop\\123.txt");        FileReader fr = null;        BufferedReader br= null;        try {            fr = new FileReader(file1);            br = new BufferedReader(fr);            String len;            while((len = br.readLine()) != null){                System.out.println(len);            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } finally {             if (br != null) {                try {                    br.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }    public static void testBufferedReaderWriter(){        File file1 = new File("C:\\Users\\Administrator\\Desktop\\123.txt");        File file2 = new File("C:\\Users\\Administrator\\Desktop\\456.txt");        FileReader fr = null;        FileWriter fw = null;        BufferedReader br= null;        BufferedWriter bw = null;        try {            fr = new FileReader(file1);            fw = new FileWriter(file2);            br = new BufferedReader(fr);            bw = new BufferedWriter(fw);            char[] c = new char[1024];            int len;            while((len = br.read(c)) != -1){                bw.write(c, 0, len);                bw.flush();            }        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } finally {            if (bw != null) {                try {                    bw.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            if (br != null) {                try {                    br.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }    //缓冲流  非文本文件的复制    public static void testBufferedInputOutputStream(){        File file1 = new File("C:\\Users\\Administrator\\Desktop\\123.txt");        File file2 = new File("C:\\Users\\Administrator\\Desktop\\456.txt");        //2、先创建相应的节点流，FileInputStream、FileInputStream        FileInputStream fis;        FileOutputStream fos;        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        try {            fis = new FileInputStream(file1);            fos = new FileOutputStream(file2);            //3、将创建的节点流的对象作为形参传递给缓冲流的构造器            bis = new BufferedInputStream(fis);            bos = new BufferedOutputStream(fos);            byte[] b = new byte[1024];            int len;                while((len = bis.read(b)) != -1){                    bos.write(b, 0, len);                    bos.flush();                }            bis.close();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            if (bos != null) {                try {                    bos.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            if (bis != null) {                try {                    bis.close();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }        }    }}

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