实现sftp链接，并下载服务器上文件

朱雀 2022-11-05 01:58 343阅读 0赞

首先，需要在pom文件中引入链接sftp的依赖，我这里用的是jsch，如下：

<dependency>
                <groupId>com.jcraft</groupId>
                <artifactId>jsch</artifactId>
                <version>0.1.54</version>
            </dependency>

其次，建立sftp链接工具类：

package com.apache.https.sinosoft.common;
    
    import com.jcraft.jsch.*;
    
    import java.io.*;
    import java.util.*;
    
    public class FTPUtils {
    
    	/**
    	 * sftp工具类
    	 *
    	 */
    	private ChannelSftp sftp = null;
    	private Session sshSession = null;
    
    	/**
    	 * 通过SFTP连接服务器
    	 */
    	public void connect(String ip,String port,String userName,String password){
    		try{
    			System.out.println("sft链接开始---》connect---begin");
    			int sftpPort = 22;//端口号
    			if(null != port && !"".equals(port)){
    				sftpPort = Integer.valueOf(port);
    			}
    			JSch jsch = new JSch();
    			jsch.getSession(userName, ip, sftpPort);
    			sshSession = jsch.getSession(userName, ip, sftpPort);
    			System.out.println("ip="+ip+"--->port"+port);
    			sshSession.setPassword(password);
    			Properties sshConfig = new Properties();
    			sshConfig.put("StrictHostKeyChecking", "no");
    			sshSession.setConfig(sshConfig);
    			// 登录
    			sshSession.connect();
    			System.out.println("sftp链接成功------>success");
    			Channel channel = sshSession.openChannel("sftp");
    			channel.connect();
    			sftp = (ChannelSftp) channel;
    			System.out.println("sft链接结束---》connect---end");
    		}
    		catch (Exception e){
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 关闭连接
    	 */
    	public void disconnect() {
    		System.out.println("sft关闭链接开始---》disconnect---begin");
    		if (this.sftp != null) {
    			if (this.sftp.isConnected()) {
    				this.sftp.disconnect();
    			}
    		}
    		if (this.sshSession != null) {
    			if (this.sshSession.isConnected()) {
    				this.sshSession.disconnect();
    			}
    		}
    		System.out.println("sft关闭链接结束---》disconnect---end");
    	}
    
    	/**
    	 * 批量下载文件
    	 *
    	 * @param remotePath：远程下载目录(以路径符号结束,可以为相对路径eg:/assess/sftp/jiesuan_2/2014/)
    	 * @param localPath：本地保存目录(以路径符号结束,D:\Duansha\sftp\)
    	 * @param fileFormat：下载文件格式(以特定字符开头,为空不做检验)
    	 * @param fileEndFormat：下载文件格式(文件格式)
    	 * @param del：下载后是否删除sftp文件
    	 * @return
    	 */
    	public List<String> batchDownLoadFile(String remotePath, String localPath,
    										  String fileFormat, String fileEndFormat, boolean del) {
    		List<String> filenames = new ArrayList<String>();
    		try {
    			// connect();
    			Vector v = listFiles(remotePath);
    			// sftp.cd(remotePath);
    			if (v.size() > 0) {
    				System.out.println("本次处理文件个数不为零,开始下载...fileSize=" + v.size());
    				Iterator it = v.iterator();
    				while (it.hasNext()) {
    					ChannelSftp.LsEntry entry = (ChannelSftp.LsEntry) it.next();
    					String filename = entry.getFilename();
    					SftpATTRS attrs = entry.getAttrs();
    					if (!attrs.isDir()) {
    						boolean flag = false;
    						String localFileName = localPath + filename;
    						fileFormat = fileFormat == null ? "" : fileFormat
    								.trim();
    						fileEndFormat = fileEndFormat == null ? ""
    								: fileEndFormat.trim();
    						// 三种情况
    						if (fileFormat.length() > 0 && fileEndFormat.length() > 0) {
    							if (filename.startsWith(fileFormat) && filename.endsWith(fileEndFormat)) {
    								flag = downloadFile(remotePath, filename, localPath, filename);
    								if (flag) {
    									filenames.add(localFileName);
    									if (flag && del) {
    										deleteSFTP(remotePath, filename);
    									}
    								}
    							}
    						} else if (fileFormat.length() > 0 && "".equals(fileEndFormat)) {
    							if (filename.startsWith(fileFormat)) {
    								flag = downloadFile(remotePath, filename, localPath, filename);
    								if (flag) {
    									filenames.add(localFileName);
    									if (flag && del) {
    										deleteSFTP(remotePath, filename);
    									}
    								}
    							}
    						} else if (fileEndFormat.length() > 0 && "".equals(fileFormat)) {
    							if (filename.endsWith(fileEndFormat)) {
    								flag = downloadFile(remotePath, filename, localPath, filename);
    								if (flag) {
    									filenames.add(localFileName);
    									if (flag && del) {
    										deleteSFTP(remotePath, filename);
    									}
    								}
    							}
    						} else {
    							flag = downloadFile(remotePath, filename, localPath, filename);
    							if (flag) {
    								filenames.add(localFileName);
    								if (flag && del) {
    									deleteSFTP(remotePath, filename);
    								}
    							}
    						}
    					}
    				}
    			}
    		} catch (SftpException e) {
    			e.printStackTrace();
    		} finally {
    			// this.disconnect();
    		}
    		return filenames;
    	}
    
    	/**
    	 * 下载单个文件
    	 *
    	 * @param ftpPath：远程下载目录(以路径符号结束)
    	 * @param remoteFileName：下载文件名
    	 * @param localPath：本地保存目录(以路径符号结束)
    	 * @param localFileName：保存文件名
    	 * @return
    	 */
    	public boolean downloadFile(String ftpPath, String remoteFileName, String localPath, String localFileName) {
    		FileOutputStream fieloutput = null;
    		System.out.println("sftp下载文件开始----->downLoad---begin");
    		try {
    			System.out.println("本地文件路径名称"+localPath + localFileName);
    			File file1 = new File(localPath);
    			if(!file1.exists()){
    				file1.mkdirs();
    			}
    			File file = new File(localPath + localFileName);
    			fieloutput = new FileOutputStream(file);
    			System.out.println("服务器文件路径名称"+ftpPath + remoteFileName);
    			sftp.get(ftpPath + remoteFileName, fieloutput);
    			System.out.println("sftp下载文件结束----->downLoad---end");
    			return true;
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		} catch (SftpException e) {
    			e.printStackTrace();
    		} finally {
    			if (null != fieloutput) {
    				try {
    					fieloutput.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    		return false;
    	}
    
    	/**
    	 * 上传单个文件
    	 *
    	 * @param remotePath：远程保存目录
    	 * @param remoteFileName：保存文件名
    	 * @param localPath：本地上传目录(以路径符号结束)
    	 * @param localFileName：上传的文件名
    	 * @return
    	 */
    	public boolean uploadFile(String remotePath, String remoteFileName, String localPath, String localFileName) {
    		FileInputStream in = null;
    		try {
    			createDir(remotePath);
    			File file = new File(localPath + localFileName);
    			in = new FileInputStream(file);
    			sftp.put(in, remoteFileName);
    			return true;
    		} catch (FileNotFoundException e) {
    			e.printStackTrace();
    		} catch (SftpException e) {
    			e.printStackTrace();
    		} finally {
    			if (in != null) {
    				try {
    					in.close();
    				} catch (IOException e) {
    					e.printStackTrace();
    				}
    			}
    		}
    		return false;
    	}
    
    	/**
    	 * 批量上传文件
    	 *
    	 * @param remotePath：远程保存目录
    	 * @param localPath：本地上传目录(以路径符号结束)
    	 * @param del：上传后是否删除本地文件
    	 * @return
    	 */
    	public boolean bacthUploadFile(String remotePath, String localPath, boolean del) {
    		try {
    			File file = new File(localPath);
    			File[] files = file.listFiles();
    			for (int i = 0; i < files.length; i++) {
    				if (files[i].isFile()
    						&& files[i].getName().indexOf("bak") == -1) {
    					if (this.uploadFile(remotePath, files[i].getName(),
    							localPath, files[i].getName())	&& del) {
    						deleteFile(localPath + files[i].getName());
    					}
    				}
    			}
    			return true;
    		} catch (Exception e) {
    			e.printStackTrace();
    		} finally {
    			this.disconnect();
    		}
    		return false;
    
    	}
    
    	/**
    	 * 删除本地文件
    	 *
    	 * @param filePath
    	 * @return
    	 */
    	public boolean deleteFile(String filePath) {
    		File file = new File(filePath);
    		if (!file.exists()) {
    			return false;
    		}
    
    		if (!file.isFile()) {
    			return false;
    		}
    		boolean rs = file.delete();
    		return rs;
    	}
    
    	/**
    	 * 创建目录
    	 *
    	 * @param createpath
    	 * @return
    	 */
    	public boolean createDir(String createpath) {
    		try {
    			if (isDirExist(createpath)) {
    				this.sftp.cd(createpath);
    				return true;
    			}
    			String pathArry[] = createpath.split("/");
    			StringBuffer filePath = new StringBuffer("/");
    			for (String path : pathArry) {
    				if (path.equals("")) {
    					continue;
    				}
    				filePath.append(path + "/");
    				if (isDirExist(filePath.toString())) {
    					sftp.cd(filePath.toString());
    				} else {
    					// 建立目录
    					sftp.mkdir(filePath.toString());
    					// 进入并设置为当前目录
    					sftp.cd(filePath.toString());
    				}
    
    			}
    			this.sftp.cd(createpath);
    			return true;
    		} catch (SftpException e) {
    			e.printStackTrace();
    		}
    		return false;
    	}
    
    	/**
    	 * 判断目录是否存在
    	 *
    	 * @param directory
    	 * @return
    	 */
    	public boolean isDirExist(String directory) {
    		boolean isDirExistFlag = false;
    		try {
    			SftpATTRS sftpATTRS = sftp.lstat(directory);
    			isDirExistFlag = true;
    			return sftpATTRS.isDir();
    		} catch (Exception e) {
    			if (e.getMessage().toLowerCase().equals("no such file")) {
    				isDirExistFlag = false;
    			}
    		}
    		return isDirExistFlag;
    	}
    
    	/**
    	 * 删除stfp文件
    	 *
    	 * @param directory：要删除文件所在目录
    	 * @param deleteFile：要删除的文件
    	 */
    	public void deleteSFTP(String directory, String deleteFile) {
    		try {
    			// sftp.cd(directory);
    			sftp.rm(directory + deleteFile);
    		} catch (Exception e) {
    			e.printStackTrace();
    		}
    	}
    
    	/**
    	 * 如果目录不存在就创建目录
    	 *
    	 * @param path
    	 */
    	public void mkdirs(String path) {
    		File f = new File(path);
    
    		String fs = f.getParent();
    
    		f = new File(fs);
    
    		if (!f.exists()) {
    			f.mkdirs();
    		}
    	}
    
    	/**
    	 * 列出目录下的文件
    	 *
    	 * @param directory：要列出的目录
    	 * @return
    	 * @throws SftpException
    	 */
    	public Vector listFiles(String directory) throws SftpException {
    		return sftp.ls(directory);
    	}
    
    
    	/**
    	 * 测试
    	 */
    	public static void main(String[] args) {
    		FTPUtils sftp = null;
    		// 本地存放地址
    		String localPath = "D:/tomcat5/webapps/ASSESS/DocumentsDir/DocumentTempDir/txtData/";
    		// Sftp下载路径
    		String sftpPath = "/home/assess/sftp/jiesuan_2/2014/";
    		List<String> filePathList = new ArrayList<String>();
    		try {
    //			sftp = new FTPUtils("10.163.201.115", "tdcp", "tdcp");
    			sftp.connect("10.163.201.115", "21", "tdcp","tdcp");
    			// 下载
    			sftp.batchDownLoadFile(sftpPath, localPath, "ASSESS", ".txt", true);
    		} catch (Exception e) {
    			e.printStackTrace();
    		} finally {
    			sftp.disconnect();
    		}
    	}
    }

这里我用的是批量文件下载，代码如下：

String date = request.getParameter("date");
    
            String ftpIP = SysConfig.getPropertity("ZBFFTPIP"); // ip
            String ftpPort = SysConfig.getPropertity("ZBFFTPPORT"); // port端口
            String ftpUserName = SysConfig.getPropertity("ZBFFTPUSERNAME"); // 用户名
            String ftpPassWord = SysConfig.getPropertity("ZBFFTPPASSWORD"); // 密码
            String ftpPath = SysConfig.getPropertity("ZBFFTPPATH");// ftp路径
            String localFilePath = SysConfig.getPropertity("RECONCILIATIONFILEPATH"); // 本地路径
    
            // 从sftp下载路径
            String path = ftpPath;
            FTPUtils sftp = new FTPUtils();
            try {
               // 链接sftp进行对账文件下载
                sftp.connect(ftpIP,ftpPort,ftpUserName,ftpPassWord);
                List<String> strings = sftp.batchDownLoadFile(path+date+"/", localFilePath+date+"/", "", ".txt", false);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                sftp.disconnect();
                response.flushBuffer();
            }

工具类中也有其他的方法可以调用，大家可以试一下。