JavaIO流-FileInputStream、FileOutputStream字节流

import org.junit.Test;

import java.io.*;

/**
 *InputStream/OutputStream
 *
 * 1.造文件
 * 2.造流
 * 3.流读写
 * 4.关闭流
 *
 * FileInputStream不能读取文本文件
 *
 * 结论：
 * 1.对于文本文件，使用字符流处理（txt,java,c,cpp）
 * 2.对于非文本文件，使用字节流(mp4,mp3,avi,jpg,doc,ppt)
 *
 *
 * @author orz
 */
public class FileInputOutputStreamTest {


    @Test
    public void test1()
    {
        FileInputStream fis=null;
        FileOutputStream fos=null;


        try {
            File file1=new File("hello.txt");
            File file2=new File("hi.txt");
            fis=new FileInputStream(file1);
            fos=new FileOutputStream(file2);

            byte [] buffer=new byte[5];
            int len;
            while ((len=fis.read(buffer))!=-1)
            {

//                String str=new String(buffer,0,len);
//                System.out.print(str);
               fos.write(buffer,0,len);
            }



        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {

            try {
                if(fos!=null)
                {
                    fos.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if(fis!=null)
                {
                    fis.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }

        }

    }


    /**
     * 图片复制
     */
    @Test
    public void test2()
    {
        FileInputStream fis=null;
        FileOutputStream fos=null;


        try {

            File file1=new File("picture1.png");
            File file2=new File("picture2.png");

            fis=new FileInputStream(file1);
            fos=new FileOutputStream(file2);

            byte [] buffer=new byte[5];
            int len;
            while ((len=fis.read(buffer))!=-1)
            {
                fos.write(buffer,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            try {
                if(fos!=null)
                {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if(fis!=null)
                {
                    fis.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }


    /**
     *
     * 实现文件复制
     */
    public void copyFileWithInputOutputStream(String srcPath,String destPath)
    {
        FileInputStream fis=null;
        FileOutputStream fos=null;


        try {

            File file1=new File(srcPath);
            File file2=new File(destPath);

            fis=new FileInputStream(file1);
            fos=new FileOutputStream(file2);

            byte [] buffer=new byte[1024];
            int len;
            while ((len=fis.read(buffer))!=-1)
            {
                fos.write(buffer,0,len);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            try {
                if(fos!=null)
                {
                    fos.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if(fis!=null)
                {
                    fis.close();
                }

            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    /**
     * 文件复制速度测试
     */
    @Test
    public void copyTest()
    {
        String srcPath="E:\\1.mp4";
        String destPath="E:\\3.mp4";
        long start=System.currentTimeMillis();
        copyFileWithInputOutputStream(srcPath,destPath);
        long end=System.currentTimeMillis();
        System.out.println("复制花费操作时间为"+(end-start));//1547
    }
}