--记录指定路径复制文件到另一个路径

Posted 2020-06-17 uimcc.com#UNCLE CHEN#

/**
 * 复制媒体文件,该例子是复制1.mp3文件,列出了四种方式.
 */
import java.<a href="https://www.baidu.com/s?wd=io&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y4uHDLnyfzujbLP1D3ujR10ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPW6Ln1T3PHRsPHczn1R1PHmY" target="_blank" class="baidu-highlight">io</a>.BufferedInputStream;
import java.<a href="https://www.baidu.com/s?wd=io&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y4uHDLnyfzujbLP1D3ujR10ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPW6Ln1T3PHRsPHczn1R1PHmY" target="_blank" class="baidu-highlight">io</a>.BufferedOutputStream;
import java.<a href="https://www.baidu.com/s?wd=io&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1Y4uHDLnyfzujbLP1D3ujR10ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3EPW6Ln1T3PHRsPHczn1R1PHmY" target="_blank" class="baidu-highlight">io</a>.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
 
public class BufferedStreamCopyFiles {
 
    public static void main(String[] args) throws IOException {
        /**
         * 共有四个方法,但建议用demo1,demo2;因为demo3需要创建数组, 如果文件大,光创建数组就需要很多时间;demo4一定也不要用,
         * 效率非常慢.
         */
        demo1();
        demo2();
        demo3();
        demo4();
 
    }
 
    public static void demo1() throws FileNotFoundException, IOException {
        FileInputStream fis = new FileInputStream("d:\\1.mp3");
        FileOutputStream fos = new FileOutputStream("d:\\01.mp3");
 
        int len = 0;
        byte[] buf = new byte[1024];
        while ((len = fis.read(buf)) != -1) {
            fos.write(buf, 0, len);
        }
        fis.close();
        fos.close();
    }
 
    public static void demo2() throws IOException {
        FileInputStream fis = new FileInputStream("d:\\1.mp3");
        BufferedInputStream bufis = new BufferedInputStream(fis);
 
        FileOutputStream fos = new FileOutputStream("d:\\02.mp3");
        BufferedOutputStream bufos = new BufferedOutputStream(fos);
 
        int len = 0;
        while ((len = bufis.read()) != -1) {
            bufos.write(len);
        }
        bufis.close();
        bufos.close();
    }
 
    // 不建议这种方式
    public static void demo3() throws IOException {
        FileInputStream fis = new FileInputStream("d:\\1.mp3");
        FileOutputStream fos = new FileOutputStream("d:\\03.mp3");
 
        byte[] buf = new byte[fis.available()];
        fis.read(buf);
        fos.write(buf);
        fos.close();
        fis.close();
 
    }
 
    public static void demo4() throws IOException {
        FileInputStream fis = new FileInputStream("d:\\1.mp3");
        FileOutputStream fos = new FileOutputStream("d:\\04.mp3");
 
        int ch = 0;
 
        while ((ch = fis.read()) != -1) {
            fos.write(ch);
        }
        fos.close();
        fis.close();
    }
}