Java IO流之过滤流

系统管理员 2021-03-28 15:21 695阅读 0赞

过滤字节流FilterInputStream和FilterOutputStream

BufferedInputStream和BufferedOutputStream    需要使用已存在的节点流来构造,提供了带缓冲的读写,提高了读写的效率

package com.tanlei.InputOutputStream;
    
    import java.io.BufferedInputStream;
    import java.io.BufferedOutputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class BufferedInputOutputDemo {
        public static void main(String[] args) {
            try {
                FileUtil1.copyFile(new File("C:\\zhangsan\\tanlei.txt"), new File("D:\\zhangsan.txt"));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        } 
    }
    class FileUtil1{
        public  static  void  copyFile(File src,File dst) throws IOException {
            FileInputStream fis=new FileInputStream(src);
            FileOutputStream fos=new FileOutputStream(dst);
            BufferedInputStream bis=new BufferedInputStream(fis);
            BufferedOutputStream bos=new BufferedOutputStream(fos);
            
            long time=System.currentTimeMillis();
            int data=0;//用来保存实际读到的字节数
            while ((data=bis.read())!=-1) {
                bos.write(data);
            }
            bis.close();
            bos.close();
            long time2=System.currentTimeMillis();
            System.out.println("共花费+"+(time2-time));
        }
    }

DataInputStream和DataOutputStream   基本数据类型进行操作

package com.tanlei.InputOutputStream;
    
    import java.io.DataInputStream;
    import java.io.DataOutputStream;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class DataInputOutputDemo {
       public static void main(String[] args) throws IOException {
         String name="tanlei";
         int age=20;
         boolean flag=true;
         char sex='男';
         double money=110.56;
         
         DataOutputStream dos=new DataOutputStream(new FileOutputStream("D:\\aa.txt"));
         dos.writeUTF(name);
         dos.writeInt(age);
         dos.writeDouble(money);
         dos.writeChar(sex);
         dos.writeBoolean(flag);
         dos.close();
         
         DataInputStream dis=new DataInputStream(new FileInputStream("D:\\\\aa.txt"));
         System.out.println(dis.readUTF());
         System.out.println(dis.readInt());
         System.out.println(dis.readDouble());
         System.out.println(dis.readChar());
         System.out.println(dis.readBoolean());
         dis.close();
       }
    }

总结:

提供带缓冲的读写