如何用java获取ftp服务器上文件的md5校验码？
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参考技术A 你好FTP协议不提供校验的。既然是采用TCP通讯的，文件完整性是有保障的吧
希望回答对你有帮助
java在浏览器上获取FTP读文件路径
如何用java在浏览器点击上传文件，从FTP服务器上选择上传的文件，获取FTP上文件的路径，如何实现，有什么插件可以用？
问一下，你是想做ftp上传下载么？
首先你需要安装一个ftp服务端程序，启动起来，然后下载一个ftp客户端程序，测试能不能连接，首先这一块儿需要测试通过。
代码ftp上传下载
2.1 上传代码：
import java.io.File;
import java.io.FileInputStream;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
public class test
private FTPClient ftp;
/**
*
* @param path 上传到ftp服务器哪个路径下
* @param addr 地址
* @param port 端口号
* @param username 用户名
* @param password 密码
* @return
* @throws Exception
*/
private boolean connect(String path,String addr,int port,String username,String password) throws Exception
boolean result = false;
ftp = new FTPClient();
int reply;
ftp.connect(addr,port);
ftp.login(username,password);
ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply))
ftp.disconnect();
return result;
ftp.changeWorkingDirectory(path);
result = true;
return result;
/**
*
* @param file 上传的文件或文件夹
* @throws Exception
*/
private void upload(File file) throws Exception
if(file.isDirectory())
ftp.makeDirectory(file.getName());
ftp.changeWorkingDirectory(file.getName());
String[] files = file.list();
for (int i = 0; i < files.length; i++)
File file1 = new File(file.getPath()+"\\\\"+files[i] );
if(file1.isDirectory())
upload(file1);
ftp.changeToParentDirectory();
else
File file2 = new File(file.getPath()+"\\\\"+files[i]);
FileInputStream input = new FileInputStream(file2);
ftp.storeFile(file2.getName(), input);
input.close();
else
File file2 = new File(file.getPath());
FileInputStream input = new FileInputStream(file2);
ftp.storeFile(file2.getName(), input);
input.close();
public static void main(String[] args) throws Exception
test t = new test();
t.connect("", "localhost", 21, "yhh", "yhhazr");
File file = new File("e:\\\\uploadify");
t.upload(file);
2.2 下载代码
这里没有用到filter，如果用filter就可以过滤想要的文件。
public class Ftp
/**
* @param args
*/
public static void main(String[] args)
// TODO Auto-generated method stub
Ftp ftp = new Ftp();
String hostname = "www.strawberry.com";
Integer port = 21;
String username = "username";
String password = "password";
String remote = "/c.txt";
String local = "/home/tin/LeonChen/FTP/";
try
ftp.connect(hostname, port, username, password);
System.out.println("接收状态："+ftp.download(remote, local));
ftp.disconnect();
catch (IOException e)
// TODO Auto-generated catch block
e.printStackTrace();
private FTPClient ftpClient = new FTPClient();
/*
* * 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
*/
private boolean connect(String hostname, int port, String username,
String password) throws IOException
ftpClient.connect(hostname, port);
ftpClient.setControlEncoding("UTF-8");
if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode()))
if (ftpClient.login(username, password))
return true;
disconnect();
return false;
/*
* 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("UTF-8"), "iso-8859-1"));
if (files.length != 1)
System.out.println("远程文件不存在");
return DownloadStatus.Remote_File_Noexist;
long lRemoteSize = files[0].getSize();
String fildName = files[0].getName();
// 本地存在文件，进行断点下载
File f = new File(local+fildName);
if (f.exists())
long localSize = f.length();
if (localSize >= lRemoteSize)
System.out.println("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);
ftpClient.setRestartOffset(localSize);
InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("UTF-8"), "iso-8859-1"));
byte[] bytes = new byte[1024];
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)
System.out.println("下载进度：" + process);
// TODO 更新文件下载进度,值存放在process变量中
in.close();
out.close();
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("UTF-8"), "iso-8859-1"));
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)
System.out.println("下载进度：" + process);
// TODO 更新文件下载进度,值存放在process变量中
in.close();
out.close();
boolean upNewStatus = ftpClient.completePendingCommand();
if (upNewStatus)
result = DownloadStatus.Download_New_Success;
else
result = DownloadStatus.Download_New_Failed;
return result;
private void disconnect() throws IOException
if (ftpClient.isConnected())
ftpClient.disconnect();
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