这篇文章主要讲解了Java实现上传文件到服务器指定目录的方法，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。

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-ssh3</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

@Configurationpublic 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.ssh3.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。

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