Java generate files to ftp server

Without further ado, just upload the code and use it directly.

If you don’t have an ftp server to test, you can set up an ftp service locally. The steps are also very simple.

Portal: How to set up an FTP service under Windows and set its username and password (taodudu.cc)

1. Introduce dependencies

    <dependency>
      <groupId>commons-net</groupId>
      <artifactId>commons-net</artifactId>
      <version>3.3</version>
    </dependency>

2. Tools

package com.gstanzer.supervise.utills;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

/**
 * @author: tangbingbing
 * @date: 2023/8/11 14:16
 */
@Slf4j
public class FTPUtils {

    /**
     * 上传文件
     *
     * @param fileName    上传到FTP服务器后的文件名称
     * @param inputStream 输入文件流
     * @return
     */
    public static boolean creatFileFTP(String hostname, int port, String username, String password, String pathname, String fileName, InputStream inputStream) {

        boolean flag = false;
        FTPClient ftpClient = new FTPClient();
        //设置超时
        ftpClient.setConnectTimeout(60 * 60 * 1000);
        //设置编码
        ftpClient.setControlEncoding("UTF-8");
        try {
            //连接FTP服务器
            ftpClient.connect(hostname, port);
            //登录FTP服务器
            ftpClient.login(username, password);
            //是否成功登录FTP服务器
            int replyCode = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(replyCode)) {
                return flag;
            }
            log.info("===========登录FTP成功==============");
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            //切换路径 创建路径
            ftpClient.makeDirectory(pathname);
            ftpClient.changeWorkingDirectory(pathname);
            ftpClient.enterLocalPassiveMode();

//            String pathDir1 = pathname+df.format(new Date());
//            boolean pathIsExis = ftpClient.changeWorkingDirectory(pathDir1);
//            log.info("查看文件夹是否存在");
//            if(!pathIsExis){//不存在文件夹则创建并且进入文件夹
//                ftpClient.makeDirectory(pathDir1);
//                ftpClient.changeWorkingDirectory(pathDir1);
//            }

            //设置缓冲
            ftpClient.setBufferSize(1024 * 1024 * 20);
            //保持连接
            ftpClient.setKeepAlive(true);
            boolean a = ftpClient.storeFile(new String(fileName.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1), inputStream);
            if (a) {
                flag = true;
                log.info("===========文件创建成功==============");
            } else {
                flag = false;
            }
            inputStream.close();
            ftpClient.logout();
            flag = true;
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return flag;
    }

    /**
     * 生成写入文件
     *
     * @param data 文件内容
     * @return
     */
    public static InputStream write(String data) {
        InputStream input = new ByteArrayInputStream(data.getBytes(StandardCharsets.UTF_8));
        return input;
    }

    public static void main(String[] args) {
        String data = "中文 data1\n中文 data2";
        InputStream in = write(data);
        boolean b = creatFileFTP("127.0.0.1", 21, "user", "pwd", "/", "test.txt", in);
        if (b) {
            System.out.println("文件生成并上传成功");
        }
    }
}