java 服务器文件下载

1.环境
引入的包：ganymed-ssh2-build210.jar
包的下载地址：http://www.ganymed.ethz.ch/ssh2/

2.创建文件下载类：FileLoadUtil 代码如下

package com.broadway.hhMtLoad.utils;

import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.SCPClient;
import ch.ethz.ssh2.Session;

public class FileLoadUtil {

	
	public static boolean downLoadFile(String dataServerIp,String dataServerUsername,String dataServerPassword,String srcFile,String saveFile,Integer port){
		boolean flag = false;
		
		Connection conn = new Connection(dataServerIp);
		Session session = null;
		SCPClient client =null;
		//session=(Session) getObject(dataServerIp, dataServerUsername, dataServerPassword, 0, "session");
		//client=(SCPClient) getObject(dataServerIp, dataServerUsername, dataServerPassword, 0, "client");
		conn=getConn(dataServerIp, dataServerUsername, dataServerPassword, port);
		try {
			session=conn.openSession();
			client=conn.createSCPClient();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		try {
			System.out.println("文件开始下载,srcFile:"+srcFile+" saveFile:"+saveFile+" "+Tools.GetCreatetime("yyyy-MM-dd HH:mm:ss"));
			flag = download(srcFile, saveFile, session, client);			
			//如果是打包文件，删除包裹
			if (flag) {
				System.out.println("文件打包下载完成！"+" "+Tools.GetCreatetime("yyyy-MM-dd HH:mm:ss"));
				
			}else {
				System.out.println("文件下载失败！"+" "+Tools.GetCreatetime("yyyy-MM-dd HH:mm:ss"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			try {
				session.close();
			} catch (Exception e2) {
			}
			try {
				conn.close();
			} catch (Exception e2) {
			}
		}
		return flag;
	}
	
	public static Object getObject(String ip,String userName,String pwd,int port,String whatWant){
		Connection conn = new Connection(ip);
		Session session = null;
		SCPClient client =null;
		try {
			conn.connect();
			boolean isAuthenticated = conn.authenticateWithPassword(userName, pwd);
			session=conn.openSession();
			 client = new SCPClient(conn);
			if (isAuthenticated == false) {
				throw new IOException("Authentication failed.文件scp到数据服务器时发生异常");
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (whatWant!=null&&whatWant.equals("session")) {
			return session;
		}if (whatWant!=null&&whatWant.equals("client")) {
			return client;
		}
		return null;
	}
	
	public static Connection getConn(String ip,String userName,String pwd,int port){
		Connection conn = new Connection(ip,port);
		boolean blag=false;
		try {
			conn.connect();
			boolean isAuthenticated = conn.authenticateWithPassword(userName, pwd);
			//session=conn.openSession();
			// client = new SCPClient(conn);
			if (isAuthenticated) {
				blag=true;
			}
			if (isAuthenticated == false) {
				throw new IOException("Authentication failed.文件scp到数据服务器时发生异常");
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		if (blag) {
			return conn;
		}else {
			return null;
		}
	}
	
	public static boolean download(String srcFile, String saveFile, Session sessionSsh, SCPClient client
			) throws UnsupportedEncodingException {		
		//String cdmTar="tar czf /var/ftp/upload/ruku/ruku.tar.gz –directory=/var/ftp/upload/ruku ruku";
		boolean flag=false;
		// 是文件,直接下载
		try {				
			String filename=srcFile.substring(srcFile.lastIndexOf("/")+1);
			if (filename.contains(".")) {
				try {
					client.get(srcFile, saveFile);
					flag=true;
				} catch (Exception e) {
					e.printStackTrace();
				}
			}else {
				//是文件夹，打包下载
				System.out.println("是文件夹,不能下载");
				//unGzipFile(saveFile+"/"+filename+".tar.gz");
									
			}							
		} catch (Exception e) {
			e.printStackTrace();
		}
		return flag; 
	}
 
	//------------------------------------------------------------------------------------------------------
  
      
    public static void createDirectory(String outputDir,String subDir){     
        File file = new File(outputDir);  
        if(!(subDir == null || subDir.trim().equals(""))){//子目录不为空  
            file = new File(outputDir + "/" + subDir);  
        }  
        if(!file.exists()){  
              if(!file.getParentFile().exists())
                  file.getParentFile().mkdirs();
            file.mkdirs();  
        }  
    }
}

3.调用示例

String dataServerIp = "192.168.0.1";//服务器IP
String dataServerUsername = "root";//服务器用户名
String dataServerPassword = "password";//服务器登录密码
String srcFile = "/user/file.txt";//要下载的文件路径
String saveFile = "d://202203";//保存路径
Integer port = 22;//端口号

System.out.println("下载文件-执行"+dataServerIp+" srcFile="+srcFile+" saveFile:"+saveFile);
FileLoadUtil.downLoadFile(dataServerIp, dataServerUsername, dataServerPassword, srcFile, saveFile, port);
System.out.println("下载文件-执行完 srcFile="+srcFile);