java复制文件（大文件）

小灰灰 2022-05-29 08:38 202阅读 0赞

1、最好用：

引入依赖包：

<dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
    </dependency>

FileUtils.moveFile(file, outputFile);

注意：moveFile()方法源码中自带删除原文件file的函数，调用moveFile()方法之前一定要关闭file的读写流，

否则，moveFile中的删除函数会抛异常！

2、参考：[https://www.cnblogs.com/-ROCKS/p/5770393.html][https_www.cnblogs.com_-ROCKS_p_5770393.html]

[https://www.cnblogs.com/coprince/p/6594348.html][https_www.cnblogs.com_coprince_p_6594348.html]

/**
         * 利用通道copy文件
         * 
         * @param source
         * @param target
         */
        public void transfer(File source, File target) {
    
            FileInputStream in = null;
            FileOutputStream out = null;
            if (!source.exists() || !source.isFile()) {
                throw new IllegalArgumentException("file not exsits!");
            }
    
            if (target.exists()) {
                target.delete();
            }
    
            try {
                target.createNewFile();
                in = new FileInputStream(source);
                out = new FileOutputStream(target);
                FileChannel inChannel = in.getChannel();
                WritableByteChannel outChannel = out.getChannel();
                inChannel.transferTo(0, inChannel.size(), outChannel);
                inChannel.close();
                outChannel.close();
                in.close();
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

[https_www.cnblogs.com_-ROCKS_p_5770393.html]: https://www.cnblogs.com/-ROCKS/p/5770393.html
[https_www.cnblogs.com_coprince_p_6594348.html]: https://www.cnblogs.com/coprince/p/6594348.html