java 把文件从一个目录复制到另一个目录

方法一:简单粗暴,直接使用copy(),如果目标存在,先使用delete()删除,再复制;

方法二:使用输入输出流。(代码注释部分)

package eg2;
 
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.Scanner;
 
/******************
 * 文件的复制
 *******************/
 
public class Test2_3 {
 
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        @SuppressWarnings("resource")
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入指定文件夹路径:");
        String oldpath = sc.next();
        System.out.println("请输入目标文件夹路径:");
        String newpath = sc.next();
        System.out.println("请输入要复制的文件名:");
        String filename = sc.next();
        copy(filename, oldpath, newpath);
        System.out.println("复制完成!");
    }
 
    private static void copy(String filename, String oldpath, String newpath) throws IOException {
        // TODO Auto-generated method stub
        File oldpaths = new File(oldpath + "/" + filename);
        File newpaths = new File(newpath + "/" + filename);
        if (!newpaths.exists()) {
            Files.copy(oldpaths.toPath(), newpaths.toPath());
        } else {
            newpaths.delete();
            Files.copy(oldpaths.toPath(), newpaths.toPath());
        }
 
        // String newfile = "";
        // newfile += newpaths;
        // FileInputStream in = new FileInputStream(oldpaths);
        // File file = new File(newfile);
        // if (!file.exists()) {
        // file.createNewFile();
        // }
        // FileOutputStream out = new FileOutputStream(newpaths);
        // byte[] buffer = new byte[1024];
        // int c;
        // while ((c = in.read(buffer)) != -1) {
        // for (int i = 0; i < c; i++) {
        // out.write(buffer[i]);
        // }
        // }
        // in.close();
        // out.close();
    }
 
}

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