apache FTP

1.maven依赖

<dependencies>
    <!--FtpClient所在的包-->
    <dependency>
        <groupId>commons-net</groupId>
        <artifactId>commons-net</artifactId>
        <version>3.6</version>
    </dependency>
    <!--日志-->
    <dependency>  
        <groupId>org.slf4j</groupId>  
        <artifactId>slf4j-log4j12</artifactId>  
        <version>1.7.2</version>  
    </dependency>
    <!--单元测试-->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.8.1</version>
        <scope>test</scope>
    </dependency>
  </dependencies>

2.文件上传(多级目录)

public static void main(String[] args) throws IOException {
       // uploadFile();
        FTPClient ftpClient = new FTPClient();
        ftpClient.setControlEncoding("UTF-8");
        ftpClient.connect("192.168.10.200",21);
        ftpClient.login("root", "123456");
        String path="aa/bb1/cc1";
        String fileName="1.png";
        InputStream in = new FileInputStream("d://1.png");
        uploadFile(ftpClient, path, in);
    }

    private static void uploadFile(FTPClient ftpClient, String path, InputStream in) throws IOException {
        int replyCode = ftpClient.getReplyCode();
        ftpClient.setDataTimeout(120000);
        //设置为二进制文件
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

        if (!FTPReply.isPositiveCompletion(replyCode)) {
            ftpClient.disconnect();
            System.out.println("FTP连接失败");
        }else {
            System.out.println("FTP连接成功");
        }


        boolean changeWorkingDirectory = ftpClient.changeWorkingDirectory(path);
        //文件夹切换失败，则创建文件夹
        if(!changeWorkingDirectory){
            String[] split = path.split("/");
            for (String s : split) {
                if (ftpClient.changeWorkingDirectory(s)) {
                    continue;
                }
                boolean makeDirectory = ftpClient.makeDirectory(s);
                if (makeDirectory) {
                    boolean b = ftpClient.changeWorkingDirectory(s);
                    if(!b){
                        throw new RuntimeException("切换目录失败");
                    }
                }
            }
        }

        String removePath = new String("1.png".getBytes("UTF-8"),"iso-8859-1");

        //上传
        ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
        if(ftpClient.storeFile(removePath, in)){
            System.out.println("文件上传成功");
        }else{
            System.out.println("文件上传失败");
        }
        //关闭文件流
        in.close();
        //关闭连接
        if (ftpClient != null) {
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }

 

3.下载单个文件

    public static void downLoadFile(FTPClient ftpClient, String remoteFile) throws IOException {
        int replyCode = ftpClient.getReplyCode();
        ftpClient.setDataTimeout(120000);
        //设置为二进制文件
        ftpClient.setFileType(FTP.BINARY_FILE_TYPE);

        if (!FTPReply.isPositiveCompletion(replyCode)) {
            ftpClient.disconnect();
            System.out.println("FTP连接失败");
        } else {
            System.out.println("FTP连接成功");
        }
        // 同理，假如指定不存在的路径，会去根路径下查找 ftpClient.changeWorkingDirectory("test2");
        File file = new File("d://11.png");
        FileOutputStream fos = new FileOutputStream(file);
        boolean result = ftpClient.retrieveFile(remoteFile, fos);
        if (result) {
            System.out.println("下载成功!");
        } else {
            System.out.println("下载失败!");
        }
        //关闭文件流
        fos.flush();
        fos.close();
        //关闭连接
        if (ftpClient != null) {
            ftpClient.logout();
            ftpClient.disconnect();
        }
    }