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  • 记录--指定路径复制文件到另一个路径

    /**
     * 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();
        }
    }

    关于java流:http://blog.csdn.net/zzp_403184692/article/details/8057693

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  • 原文地址:https://www.cnblogs.com/dscs/p/5238017.html
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