将一个文件从一个文件夹拷贝到另一个文件夹的java代码

来源：互联网发布：营销数据分析 pdf 编辑：程序博客网时间：2024/05/16 16:08

package cn.zby.test;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.FileInputStream;import java.io.FileOutputStream;import org.junit.Test;public class TestDemo1 {@Testpublic void demo1() throws Exception{FileInputStream fis = new FileInputStream("F:/test/邓小平时代.pdf");FileOutputStream fos = new FileOutputStream("F:/test/result/邓小平时代.pdf");int len = 0;byte[] buf = new byte[1024];while ((len = fis.read(buf)) != -1) {fos.write(buf, 0, len);}fos.close();fis.close();}@Testpublic void demo2() throws Exception{FileInputStream fis = new FileInputStream("F:/test/邓小平时代.pdf");BufferedInputStream bufferedInputStream = new BufferedInputStream(fis);FileOutputStream fos = new FileOutputStream("F:/test/result/邓小平时代.pdf");BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(fos);int len = 0;while ((len = bufferedInputStream.read()) != -1) {bufferedOutputStream.write(len);}bufferedOutputStream.close();bufferedInputStream.close();}//---------不建议使用的两种-----------------------------------------------------@Testpublic void demo3() throws Exception{//需要创建数组，如果文件过大，创建数组花费时间太长FileInputStream fis = new FileInputStream("F:/test/邓小平时代.pdf");FileOutputStream fos = new FileOutputStream("F:/test/result/邓小平时代.pdf");byte[] buf = new byte[fis.available()]; fis.read(buf); fos.write(buf);fos.close();fis.close();}@Testpublic void demo4() throws Exception{//没有缓冲区的效率很慢的FileInputStream fis = new FileInputStream("F:/test/邓小平时代.pdf");FileOutputStream fos = new FileOutputStream("F:/test/result/邓小平时代.pdf");int len = 0;while ((len = fis.read()) != -1) {fos.write(len);}fos.close();fis.close();}}

参考：百度知道

0 0