同一个局域网内，使用 java 从服务器共享文件夹中复制文件到本地。

1 引用jar 包

<dependency>
    <groupId>org.samba.jcifs</groupId>
    <artifactId>jcifs</artifactId>
    <version>1.3.14-kohsuke-1</version>
</dependency>

2 从本地上传文件到服务器共享文件夹

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;

import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileOutputStream;

/**
 *
 * <b>类名称：</b>CopyFileToLan<br/>
 * <b>类描述：</b> 本地文件写入局域网共享文件夹   <br/>
 * <b>版本：</b>V1.0<br/>
 */
public class CopyFileToLan {

    public static void main(String[] args){

        InputStream in = null;
        OutputStream out = null;
        try {
            //测试文件
            File localFile = new File("D:\文档\test.txt");

            String host = "192.168.1.151";//远程服务器的地址
            String username = "admin";//用户名
            String password = "admin";//密码
            String path = "/share/";//远程服务器共享文件夹名称

            String remoteUrl = "smb://" + username + ":" + password + "@" + host + path + (path.endsWith("/") ? "" : "/");
            SmbFile remoteFile = new SmbFile(remoteUrl + "/" + localFile.getName());
            remoteFile.connect();

            in = new BufferedInputStream(new FileInputStream(localFile));
            out = new BufferedOutputStream(new SmbFileOutputStream(remoteFile));

            byte[] buffer = new byte[4096];
            int len = 0;
            while ((len = in.read(buffer, 0, buffer.length)) != -1) {
                out.write(buffer, 0, len);
            }
            out.flush();
        }
        catch (Exception e) {
            String msg = "发生错误：" + e.getLocalizedMessage();
            System.out.println(msg);
        }
        finally {
            try {
                if(out != null) {
                    out.close();
                }
                if(in != null) {
                    in.close();
                }
            }
            catch (Exception e) {}
        }
    }
}

3 从服务器共享文件夹下载文件到本地

import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileInputStream;
import java.io.*;

/**
 * <b>类名称：</b>CopyLanFileToLocal<br/>
 * <b>类描述：</b> 读取局域网共享文件夹文件，到本地文件夹   <br/>
 */
public class CopyLanFileToLocal {

    public static void main(String[] args) {
        InputStream in = null;
        OutputStream out = null;
        try {
            //目标文件名
            String fileName = "1.jpg";
            //本地文件
            String localPath = "d:/";

            String host = "192.168.1.151";//远程服务器的地址
            String username = "admin";//用户名
            String password = "admin";//密码
            String path = "/share/";//远程服务器共享文件夹名称

            String remoteUrl = "smb://" + username + ":" + password + "@" + host + path + (path.endsWith("/") ? "" : "/");

            //创建远程文件对象
            SmbFile remoteFile = new SmbFile(remoteUrl + "/" + fileName);
            remoteFile.connect();

            //创建文件流
            in = new BufferedInputStream(new SmbFileInputStream(remoteFile));
            out = new BufferedOutputStream(new FileOutputStream(new File(localPath + fileName)));
            //读取文件内容
            byte[] buffer = new byte[4096];
            int len = 0;
            while ((len = in.read(buffer, 0, buffer.length)) != -1) {
                out.write(buffer, 0, len);
            }

            out.flush();
        } catch (Exception e) {
            String msg = "下载远程文件出错：" + e.getLocalizedMessage();
            System.out.println(msg);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (Exception e) {
            }
        }
    }
}

SmbFile 和 FIle 对文件的操作基本一致， 在文件复制的时候，想过用 commons-io 的FileUtils.copyFile(final File srcFile, final File destFile);和 java 1.7 的 Files.copy(Path source, Path target, CopyOption... options);但是由于SmbFile 和 File 不属于一个类型，导致失败，最后只能选择使用流的方式进行操作。