FTpUtil

import lombok.extern.log4j.Log4j2;
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.springframework.util.StringUtils;

import java.io.IOException;
import java.io.InputStream;

@Log4j2
public class FtpUtil {

    /**
     * Description: 向FTP服务器上传文件
     *
     * @param host     FTP服务器ip
     * @param port     FTP服务器端口
     * @param username FTP登录账号
     * @param password FTP登录密码
     * @param filePath FTP服务器文件存放路径
     * @param filename 上传到FTP服务器上的文件名
     * @param input    输入流
     * @return 成功返回true，否则返回false
     */
    public static boolean uploadFile(String host, int port, String username, String password,
                                     String filePath, String filename, InputStream input) {
        boolean result = false;
        FTPClient ftp = new FTPClient();
        try {
            int reply;
            ftp.connect(host, port);// 连接FTP服务器
            // 如果采用默认端口，可以使用ftp.connect(host)的方式直接连接FTP服务器
            if (ftp.login(username, password)) {
                log.info("{}", "FTP login successfully !!!");
            }// 登录
            else {
                log.error("{}", "FTP login failed !!!");
            }
            reply = ftp.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                return result;
            }

            //切换到上传目录,目录不存在则逐级创建
            String[] dirs = filePath.split("/");
            for (String str : dirs) {
                if(StringUtils.isEmpty(str)) {
                    continue;
                }
                if (!ftp.changeWorkingDirectory(str)) {
                    ftp.makeDirectory(str);
                    ftp.changeWorkingDirectory(str);
                }
            }
            //设置为被动模式
            ftp.enterLocalPassiveMode();
            //设置上传文件的类型为二进制类型
            ftp.setFileType(FTP.BINARY_FILE_TYPE);
            //上传文件
            if (ftp.storeFile(filename, input)) {
                result = true;
            } else {
                result = false;
            }
            input.close();
            ftp.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return result;
    }

    //判断ftp服务器文件是否存在
    public static boolean existFile(FTPClient ftpClient, String path) throws IOException {
        boolean flag = false;
        FTPFile[] ftpFileArr = ftpClient.listFiles(path);
        if (ftpFileArr.length > 0) {
            flag = true;
        }
        return flag;
    }

    /**
     * 上传
     *
     * @param hostname    ip或域名地址
     * @param port        端口
     * @param username    用户名
     * @param password    密码
     * @param workingPath 服务器的工作目
     * @param inputStream 要上传文件的输入流
     * @param saveName    设置上传之后的文件名
     * @return
     */
    public static boolean upload(String hostname, int port, String username, String password, String workingPath, InputStream inputStream, String saveName) {
        boolean flag = false;
        FTPClient ftpClient = new FTPClient();
        ftpClient.setDataTimeout(2 * 60 * 1000);
        //1 测试连接
        if (connect(ftpClient, hostname, port, username, password)) {
            try {
                //2 检查工作目录是否存在
                if (ftpClient.changeWorkingDirectory(workingPath)) {
                    // 3 检查是否上传成功
                    if (storeFile(ftpClient, saveName, inputStream)) {
                        flag = true;
                        disconnect(ftpClient);
                    }
                } else {
                    log.error("{}", "目录不存在");
                }
            } catch (IOException e) {
                log.error("工作目录不存在");
                e.printStackTrace();
                disconnect(ftpClient);
            }
        }
        return flag;
    }

    /**
     * 断开连接
     *
     * @param ftpClient
     * @throws Exception
     */
    public static void disconnect(FTPClient ftpClient) {
        if (ftpClient.isConnected()) {
            try {
                ftpClient.disconnect();
                log.error("已关闭连接");
            } catch (IOException e) {
                log.error("没有关闭连接");
                e.printStackTrace();
            }
        }
    }

    /**
     * 测试是否能连接
     *
     * @param ftpClient
     * @param hostname  ip或域名地址
     * @param port      端口
     * @param username  用户名
     * @param password  密码
     * @return 返回真则能连接
     */
    public static boolean connect(FTPClient ftpClient, String hostname, int port, String username, String password) {
        boolean flag = false;
        try {
            //ftp初始化的一些参数
            ftpClient.connect(hostname, port);
            ftpClient.enterLocalPassiveMode();
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            ftpClient.setControlEncoding("UTF-8");
            if (ftpClient.login(username, password)) {
                log.info("连接ftp成功");
                flag = true;
            } else {
                log.error("连接ftp失败，可能用户名或密码错误");
                try {
                    disconnect(ftpClient);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        } catch (IOException e) {
            log.error("连接失败，可能ip或端口错误");
            e.printStackTrace();
        }
        return flag;
    }

    /**
     * 上传文件
     *
     * @param ftpClient
     * @param saveName        全路径。如/home/public/a.txt
     * @param fileInputStream 要上传的文件流
     * @return
     */
    public static boolean storeFile(FTPClient ftpClient, String saveName, InputStream fileInputStream) {
        boolean flag = false;
        try {
            if (ftpClient.storeFile(saveName, fileInputStream)) {
                flag = true;
                log.error("上传成功");
                disconnect(ftpClient);
            } else {
                log.error("{}", "上传失败");
            }
        } catch (IOException e) {
            log.error("上传失败");
            disconnect(ftpClient);
            e.printStackTrace();
        }
        return flag;
    }

}