本章介绍 Spring Boot 整合 Ftpclient 的示例，支持断点续传
1 新建 Spring Boot Maven 示例工程项目
注意：是用来 IDEA 开发工具
- File > New > Project，如下图选择
Spring Initializr然后点击 【Next】下一步 - 填写
GroupId（包名）、Artifact（项目名） 即可。点击 下一步
groupId=com.fishpro
artifactId=ftpclient - 选择依赖
Spring Web Starter前面打钩。 - 项目名设置为
spring-boot-study-ftpclient.
2 引入依赖 Pom
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- apache ftp支持 -->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
<version>3.6</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
3 编写代码示例
这里主要编写一个 Ftp操作类，对Ftp 进行 连接、关闭、上传文件、创建服务器目录、下载。来源网络，具体引用哪里已经找不到了。
package com.fishpro.ftpclient.util;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
/**
* 支持断点续传的FTP实用类
*
* @author xiongl
* @version 0.1 实现基本断点上传下载
* @version 0.2 实现上传下载进度汇报
* @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持
*/
public class FtpContinueClient
{
private static final Logger logger = LoggerFactory.getLogger(FtpContinueClient.class);
public FTPClient ftpClient = new FTPClient();
public FtpContinueClient()
{
// 设置将过程中使用到的命令输出到控制台
// this.ftpClient.addProtocolCommandListener(new
// PrintCommandListener(new PrintWriter(System.out)));
}
/**
* 连接到FTP服务器
*
* @param hostname 主机名
* @param port 端口
* @param username 用户名
* @param password 密码
* @return 是否连接成功
* @throws IOException
*/
public boolean connect(String hostname, int port, String username, String password)
throws Exception {
try
{
ftpClient.connect(hostname, port);
}
catch (Exception e)
{
throw new Exception("登陆异常，请检查主机端口");
}
ftpClient.setControlEncoding("GBK");
if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode()))
{
if (ftpClient.login(username, password))
{
return true;
}
else
throw new Exception("登陆异常，请检查密码账号");
}
else
throw new Exception("登陆异常");
}
public String[] getFileList(String filedir)
throws IOException {
ftpClient.enterLocalPassiveMode();
FTPFile[] files = ftpClient.listFiles(filedir);
String[] sfiles = null;
if (files != null)
{
sfiles = new String[files.length];
for (int i = 0; i < files.length; i++)
{
// System.out.println(files[i].getName());
sfiles[i] = files[i].getName();
}
}
return sfiles;
}
/**
* 从FTP服务器上下载文件,支持断点续传，上传百分比汇报
*
* @param remote 远程文件路径
* @param local 本地文件路径
* @return 上传的状态
* @throws IOException
*/
public DownloadStatus download(String remote, String local)
throws IOException {
// 设置被动模式
ftpClient.enterLocalPassiveMode();
// 设置以二进制方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
DownloadStatus result;
// 检查远程文件是否存在
FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"), "iso-8859-1"));
if (files.length != 1)
{
// System.out.println("远程文件不存在");
logger.info("远程文件不存在");
return DownloadStatus.Remote_File_Noexist;
}
long lRemoteSize = files[0].getSize();
File f = new File(local);
// 本地存在文件，进行断点下载
if (f.exists())
{
long localSize = f.length();
// 判断本地文件大小是否大于远程文件大小
if (localSize >= lRemoteSize)
{
logger.info("本地文件大于远程文件，下载中止");
return DownloadStatus.Local_Bigger_Remote;
}
// 进行断点续传，并记录状态
FileOutputStream out = new FileOutputStream(f, true);
// 找出本地已经接收了多少
ftpClient.setRestartOffset(localSize);
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"), "iso-8859-1"));
try
{
byte[] bytes = new byte[1024];
// 总的进度
long step = lRemoteSize / 100;
long process = localSize / step;
int c;
while ((c = in.read(bytes)) != -1)
{
out.write(bytes, 0, c);
localSize += c;
long nowProcess = localSize / step;
if (nowProcess > process)
{
process = nowProcess;
if (process % 10 == 0)
logger.info("下载进度：" + process);
// TODO 更新文件下载进度,值存放在process变量中
}
}
}
catch (Exception e)
{
}
finally
{
if (in != null)
in.close();
if (out != null)
out.close();
}
// 确认是否全部下载完毕
boolean isDo = ftpClient.completePendingCommand();
if (isDo)
{
result = DownloadStatus.Download_From_Break_Success;
}
else
{
result = DownloadStatus.Download_From_Break_Failed;
}
}
else
{
OutputStream out = new FileOutputStream(f);
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"), "iso-8859-1"));
try
{
byte[] bytes = new byte[1024];
long step = lRemoteSize / 100;
long process = 0;
long localSize = 0L;
int c;
while ((c = in.read(bytes)) != -1)
{
out.write(bytes, 0, c);
localSize += c;
long nowProcess = localSize / step;
if (nowProcess > process)
{
process = nowProcess;
if (process % 10 == 0)
logger.info("下载进度：" + process);
// TODO 更新文件下载进度,值存放在process变量中
}
}
}
catch (Exception e)
{
}
finally
{
if (in != null)
in.close();
if (out != null)
out.close();
}
boolean upNewStatus = ftpClient.completePendingCommand();
if (upNewStatus)
{
result = DownloadStatus.Download_New_Success;
}
else
{
result = DownloadStatus.Download_New_Failed;
}
}
return result;
}
/**
* 上传文件到FTP服务器，支持断点续传
*
* @param local 本地文件名称，绝对路径
* @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
* @return 上传结果
* @throws IOException
*/
public UploadStatus upload(String local, String remote)
throws IOException {
// 设置PassiveMode传输
ftpClient.enterLocalPassiveMode();
// 设置以二进制流的方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.setControlEncoding("GBK");
UploadStatus result;
// 对远程目录的处理
String remoteFileName = remote;
if (remote.contains("/"))
{
remoteFileName = remote.substring(remote.lastIndexOf("/") + 1);
// 创建服务器远程目录结构，创建失败直接返回
if (CreateDirecroty(remote, ftpClient) == UploadStatus.Create_Directory_Fail)
{
return UploadStatus.Create_Directory_Fail;
}
}
// 检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"), "iso-8859-1"));
if (files.length == 1)
{
long remoteSize = files[0].getSize();
File f = new File(local);
long localSize = f.length();
if (remoteSize == localSize)
{
return UploadStatus.File_Exits;
}
else if (remoteSize > localSize)
{
return UploadStatus.Remote_Bigger_Local;
}
// 尝试移动文件内读取指针,实现断点续传
result = uploadFile(remoteFileName, f, ftpClient, remoteSize);
// 如果断点续传没有成功，则删除服务器上文件，重新上传
if (result == UploadStatus.Upload_From_Break_Failed)
{
if (!ftpClient.deleteFile(remoteFileName))
{
return UploadStatus.Delete_Remote_Faild;
}
result = uploadFile(remoteFileName, f, ftpClient, 0);
}
}
else
{
result = uploadFile(remoteFileName, new File(local), ftpClient, 0);
}
return result;
}
/**
* 断开与远程服务器的连接
*
* @throws IOException
*/
public void disconnect()
throws IOException {
if (ftpClient.isConnected())
{
ftpClient.disconnect();
}
}
/**
* 递归创建远程服务器目录
*
* @param remote 远程服务器文件绝对路径
* @param ftpClient FTPClient对象
* @return 目录创建是否成功
* @throws IOException
*/
public UploadStatus CreateDirecroty(String remote, FTPClient ftpClient)
throws IOException {
UploadStatus status = UploadStatus.Create_Directory_Success;
String directory = remote.substring(0, remote.lastIndexOf("/") + 1);
if (!directory.equalsIgnoreCase("/")
&& !ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"), "iso-8859-1")))
{
// 如果远程目录不存在，则递归创建远程服务器目录
int start = 0;
int end = 0;
if (directory.startsWith("/"))
{
start = 1;
}
else
{
start = 0;
}
end = directory.indexOf("/", start);
while (true)
{
String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1");
if (!ftpClient.changeWorkingDirectory(subDirectory))
{
if (ftpClient.makeDirectory(subDirectory))
{
ftpClient.changeWorkingDirectory(subDirectory);
}
else
{
System.out.println("创建目录失败");
return UploadStatus.Create_Directory_Fail;
}
}
start = end + 1;
end = directory.indexOf("/", start);
// 检查所有目录是否创建完毕
if (end <= start)
{
break;
}
}
}
return status;
}
/**
* 上传文件到服务器,新上传和断点续传
*
* @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变
* @param localFile 本地文件File句柄，绝对路径
* @param ftpClient FTPClient引用
* @return
* @throws IOException
*/
public UploadStatus uploadFile(String remoteFile, File localFile, FTPClient ftpClient, long remoteSize)
throws IOException {
UploadStatus status;
// 显示进度的上传
long step = localFile.length() / 100;
long process = 0;
long localreadbytes = 0L;
RandomAccessFile raf = new RandomAccessFile(localFile, "r");
OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"), "iso-8859-1"));
// 断点续传
if (remoteSize > 0)
{
ftpClient.setRestartOffset(remoteSize);
process = remoteSize / step;
raf.seek(remoteSize);
localreadbytes = remoteSize;
}
byte[] bytes = new byte[1024];
int c;
while ((c = raf.read(bytes)) != -1)
{
out.write(bytes, 0, c);
localreadbytes += c;
if (localreadbytes / step != process)
{
process = localreadbytes / step;
System.out.println("上传进度:" + process);
// TODO 汇报上传状态
}
}
out.flush();
raf.close();
out.close();
boolean result = ftpClient.completePendingCommand();
if (remoteSize > 0)
{
status = result ? UploadStatus.Upload_From_Break_Success : UploadStatus.Upload_From_Break_Failed;
}
else
{
status = result ? UploadStatus.Upload_New_File_Success : UploadStatus.Upload_New_File_Failed;
}
return status;
}
public static void main(String[] args)
{
FtpContinueClient myFtp = new FtpContinueClient();
try
{
//myFtp.connect("192.168.1.245", 21, "aircom", "123456");
// myFtp.ftpClient.makeDirectory(new
// String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.changeWorkingDirectory(new
// String("电视剧".getBytes("GBK"),"iso-8859-1"));
// myFtp.ftpClient.makeDirectory(new
// String("走西口".getBytes("GBK"),"iso-8859-1"));
// System.out.println(myFtp.upload("E:\yw.flv", "/yw.flv",5));
// System.out.println(myFtp.upload("E:\走西口24.mp4","/央视走西口/新浪网/走西口24.mp4"));
//System.out.println(myFtp.download("2.txt", "H:\sfa.txt"));
//myFtp.disconnect();
}
catch (Exception e)
{
System.out.println("连接FTP出错：" + e.getMessage());
}
}
public enum DownloadStatus
{
Remote_File_Noexist, // 远程文件不存在
Local_Bigger_Remote, // 本地文件大于远程文件
Download_From_Break_Success, // 断点下载文件成功
Download_From_Break_Failed, // 断点下载文件失败
Download_New_Success, // 全新下载文件成功
Download_New_Failed; // 全新下载文件失败
}
public enum UploadStatus
{
Create_Directory_Fail, // 远程服务器相应目录创建失败
Create_Directory_Success, // 远程服务器闯将目录成功
Upload_New_File_Success, // 上传新文件成功
Upload_New_File_Failed, // 上传新文件失败
File_Exits, // 文件已经存在
Remote_Bigger_Local, // 远程文件大于本地文件
Upload_From_Break_Success, // 断点续传成功
Upload_From_Break_Failed, // 断点续传失败
Delete_Remote_Faild; // 删除远程文件失败
}
}
在启动文件中
@SpringBootApplication
public class FtpclientApplication {
public static void main(String[] args) {
SpringApplication.run(FtpclientApplication.class, args);
/*FtpContinueClient*/
FtpContinueClient ftp=new FtpContinueClient();
String filePath="";
String filename="";
try{
ftp.connect("192.168.0.1",21,"administrator","xxdfsdfs^");
FtpContinueClient.UploadStatus uploadStatus= ftp.upload(filePath,"/"+filename);
ftp.disconnect();
}catch (Exception ex){
ex.printStackTrace();
}finally {
}
}
}
本示例支持断点续传，能够解决大部分FTP客户端上传问题(代码来源网络)