Java实现上传文件到指定服务器指定目录

前言需求

使用freemarker生成的静态文件，统一存储在某个服务器上。本来一开始打算使用ftp实现的，奈何老连接不上，改用jsch。毕竟有现成的就很舒服，在此介绍给大家。

具体实现

引入的pom

<dependency>
	<groupId>ch.ethz.ganymed</groupId>
	<artifactId>ganymed-ssh2</artifactId>
	<version>262</version>
</dependency>

<dependency>
	<groupId>com.jcraft</groupId>
	<artifactId>jsch</artifactId>
	<version>0.1.55</version>
</dependency>

建立实体类

public class ResultEntity {

    private String code;

    private String message;

    private File file;
    
    public ResultEntity(){}
    
	public ResultEntity(String code, String message, File file) {
		super();
		this.code = code;
		this.message = message;
		this.file = file;
	}

	public String getCode() {
		return code;
	}

	public void setCode(String code) {
		this.code = code;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public File getFile() {
		return file;
	}

	public void setFile(File file) {
		this.file = file;
	}
    
}

public class ScpConnectEntity {
    private String userName;
    private String passWord;
    private String url;
    private String targetPath;

    public String getTargetPath() {
        return targetPath;
    }

    public void setTargetPath(String targetPath) {
        this.targetPath = targetPath;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassWord() {
        return passWord;
    }

    public void setPassWord(String passWord) {
        this.passWord = passWord;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

}

建立文件上传工具类

@Configuration
public class FileUploadUtil {

    @Value("${remoteServer.url}")
    private String url;

    @Value("${remoteServer.password}")
    private String passWord;

    @Value("${remoteServer.username}")
    private String userName;

    @Async
    public ResultEntity uploadFile(File file, String targetPath, String remoteFileName) throws Exception{
        ScpConnectEntity scpConnectEntity=new ScpConnectEntity();
        scpConnectEntity.setTargetPath(targetPath);
        scpConnectEntity.setUrl(url);
        scpConnectEntity.setPassWord(passWord);
        scpConnectEntity.setUserName(userName);

        String code = null;
        String message = null;
        try {
            if (file == null || !file.exists()) {
                throw new IllegalArgumentException("请确保上传文件不为空且存在！");
            }
            if(remoteFileName==null || "".equals(remoteFileName.trim())){
                throw new IllegalArgumentException("远程服务器新建文件名不能为空!");
            }
            remoteUploadFile(scpConnectEntity, file, remoteFileName);
            code = "ok";
            message = remoteFileName;
        } catch (IllegalArgumentException e) {
            code = "Exception";
            message = e.getMessage();
        } catch (JSchException e) {
            code = "Exception";
            message = e.getMessage();
        } catch (IOException e) {
            code = "Exception";
            message = e.getMessage();
        } catch (Exception e) {
            throw e;
        } catch (Error e) {
            code = "Error";
            message = e.getMessage();
        }
        return new ResultEntity(code, message, null);
    }


    private void remoteUploadFile(ScpConnectEntity scpConnectEntity, File file,
                                 String remoteFileName) throws JSchException, IOException {

        Connection connection = null;
        ch.ethz.ssh2.Session session = null;
        SCPOutputStream scpo = null;
        FileInputStream fis = null;

        try {
            createDir(scpConnectEntity);
        }catch (JSchException e) {
            throw e;
        }

        try {
            connection = new Connection(scpConnectEntity.getUrl());
            connection.connect();

            if(!connection.authenticateWithPassword(scpConnectEntity.getUserName(),scpConnectEntity.getPassWord())){
                throw new RuntimeException("SSH连接服务器失败");
            }
            session = connection.openSession();

            SCPClient scpClient = connection.createSCPClient();

            scpo = scpClient.put(remoteFileName, file.length(), scpConnectEntity.getTargetPath(), "0666");
            fis = new FileInputStream(file);

            byte[] buf = new byte[1024];
            int hasMore = fis.read(buf);

            while(hasMore != -1){
                scpo.write(buf);
                hasMore = fis.read(buf);
            }
        } catch (IOException e) {
            throw new IOException("SSH上传文件至服务器出错"+e.getMessage());
        }finally {
            if(null != fis){
                try {
                    fis.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(null != scpo){
                try {
                    scpo.flush();
//                    scpo.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(null != session){
                session.close();
            }
            if(null != connection){
                connection.close();
            }
        }
    }


    private boolean createDir(ScpConnectEntity scpConnectEntity ) throws JSchException {

        JSch jsch = new JSch();
        com.jcraft.jsch.Session sshSession = null;
        Channel channel= null;
        try {
            sshSession = jsch.getSession(scpConnectEntity.getUserName(), scpConnectEntity.getUrl(), 22);
            sshSession.setPassword(scpConnectEntity.getPassWord());
            sshSession.setConfig("StrictHostKeyChecking", "no");
            sshSession.connect();
            channel = sshSession.openChannel("sftp");
            channel.connect();
        } catch (JSchException e) {
            e.printStackTrace();
            throw new JSchException("SFTP连接服务器失败"+e.getMessage());
        }
        ChannelSftp channelSftp=(ChannelSftp) channel;
        if (isDirExist(scpConnectEntity.getTargetPath(),channelSftp)) {
            channel.disconnect();
            channelSftp.disconnect();
            sshSession.disconnect();
            return true;
        }else {
            String pathArry[] = scpConnectEntity.getTargetPath().split("/");
            StringBuffer filePath=new StringBuffer("/");
            for (String path : pathArry) {
                if (path.equals("")) {
                    continue;
                }
                filePath.append(path + "/");
                try {
                    if (isDirExist(filePath.toString(),channelSftp)) {
                        channelSftp.cd(filePath.toString());
                    } else {
                        // 建立目录
                        channelSftp.mkdir(filePath.toString());
                        // 进入并设置为当前目录
                        channelSftp.cd(filePath.toString());
                    }
                } catch (SftpException e) {
                    e.printStackTrace();
                    throw new JSchException("SFTP无法正常操作服务器"+e.getMessage());
                }
            }
        }
        channel.disconnect();
        channelSftp.disconnect();
        sshSession.disconnect();
        return true;
    }

    private boolean isDirExist(String directory,ChannelSftp channelSftp) {
        boolean isDirExistFlag = false;
        try {
            SftpATTRS sftpATTRS = channelSftp.lstat(directory);
            isDirExistFlag = true;
            return sftpATTRS.isDir();
        } catch (Exception e) {
            if (e.getMessage().toLowerCase().equals("no such file")) {
                isDirExistFlag = false;
            }
        }
        return isDirExistFlag;
    }
}

属性我都写在Spring的配置文件里面了。将这个类托管给spring容器。
如果在普通类里面使用这个类，就需要看一下上篇博客了。哈哈。

总结

在我们使用的时候，主要调uploadFile这个方法即可。传递File文件，目标路径及文件名称。