本文共 4142 字，大约阅读时间需要 13 分钟。
java中使用FTP传送文件或者取得文件，可以使用Jakarta Commons NET（FTPClient）的包来实现。
具体的示例如下：（例子是从网上拷贝的）
package test.ftp; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPReply; public class FtpClientUtil { private static final int FTP_PORT = 21; public static void main(String[] args) { try { //读入文件 FileInputStream fis = new FileInputStream("c:\testftp.txt"); //传送文件到FTP服务器 FtpClientUtil.sendFile("localhost", FTP_PORT, "testuser", "testpassword", "remoteFilename", fis); //从FTP服务器取得文件 FileOutputStream fos = new FileOutputStream("localfile"); FtpClientUtil.retrieveFile("localhost", FTP_PORT, "testuser", "testpassword", "remoteFilename", fos); } catch (Exception e) { e.printStackTrace(); } } //上传文件 public static void sendFile (String host, int port, String user, String password, String remoteFilename, InputStream is ) throws Exception { FTPClient ftpclient = new FTPClient(); try { //设置服务器名和端口 ftpclient.connect(host, port); int reply = ftpclient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { //连接错误的时候报错。 Exception ee = new Exception("Can't Connect to :" + host); throw ee; } //登录 if (ftpclient.login(user, password) == false) { // invalid user/password Exception ee = new Exception("Invalid user/password"); throw ee; } //设置传送文件模式 ftpclient.setFileType(FTP.BINARY_FILE_TYPE); //传送文件 ftpclient.storeFile(remoteFilename, is); } catch (IOException e) { throw e; } finally { try { ftpclient.disconnect(); //解除连接 } catch (IOException e) { } } } //文件下载 public static void retrieveFile(String host, int port, String user, String password, String remoteFilename, OutputStream os) throws Exception { FTPClient ftpclient = new FTPClient(); try { //设置服务器名和端口 ftpclient.connect(host, port); int reply = ftpclient.getReplyCode(); if (!FTPReply.isPositiveCompletion(reply)) { //连接错误 Exception ee = new Exception("Can't Connect to :" + host); throw ee; } //登录 if (ftpclient.login(user, password) == false) { // invalid user/password Exception ee = new Exception("Invalid user/password"); throw ee; } //设置传送模式 ftpclient.setFileType(FTP.BINARY_FILE_TYPE); // 取得文件 ftpclient.retrieveFile(remoteFilename, os); } catch (IOException e) { throw e; } finally { try { ftpclient.disconnect(); //解除连接 } catch (IOException e) { } } } } 转载地址：http://zazhd.baihongyu.com/