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
@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.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。
看完上述内容，是不是对Java实现上传文件到服务器指定目录的方法有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。
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