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我见过很多与此错误相关的帖子，但没有找到任何适合我的解决方案。 所以我再次发布它。连接超时，但连接到FTP服务器
我想在ft.drivehq.com上使用apache commons库上传文件。我已经尝试了很多解决方案，比如防火墙设置等等。
这是从表单字段获取文件名并调用ftp连接方法和上传文件方法的代码。
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ismultipart = ServletFileUpload.isMultipartContent(request);
response.setContentType("text/html");
PrintWriter out = response.getWriter();
if(!ismultipart)
{
out.println("<html>");
out.println("<head>");
out.println("<title>servlet upload</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>no file upload</p>");
out.println("</body>");
out.println("</html>");
return;
}
DiskFileItemFactory fileItemFactory = new DiskFileItemFactory();
fileItemFactory.setSizeThreshold(1 * 1024 * 1024);
fileItemFactory.setRepository(new File(TMP_DIR_PATH));
ServletFileUpload uploadHandler = new ServletFileUpload(fileItemFactory);
Connection con = null;
PreparedStatement pstm = null;
PreparedStatement pstm1 = null;
PreparedStatement pstm2 = null;
PreparedStatement pstm3 = null;
try {
/*
* Parse the request
*/
con = Dbconnector.getConnection();
List items = uploadHandler.parseRequest(request);
Iterator itr = items.iterator();
String fileName = "";
FileItem item = (FileItem) itr.next();
System.out.println("item "+item);
String fName = item.getName();
System.out.println("fname " + fName);
fileName = (String) item.getName();
System.out.println("filename " + fileName);
int x = fileName.lastIndexOf('\\');
String fN = fileName.substring(x + 1, fileName.length());
System.out.println(fN);
SimpleFTPClient client = null;
\\table to retrieve drivehq login details
String sq1 = "select * from adserver";
pstm3 = con.prepareStatement(sq1);
ResultSet rs1 = pstm3.executeQuery();
String user = "";
String cld = "";
while (rs1.next()) {
client = new SimpleFTPClient();
cld = rs1.getString("host_name");
user = rs1.getString("username");
client.setHost(rs1.getString("host_name"));
client.setUser(rs1.getString("username"));
client.setPassword(rs1.getString("password"));
client.setRemoteFile("pdp_cloud");
client.setport(21);
boolean log = client.connect();
System.out.println(log);
if (log) {
if(client.uploadFile(item.getInputStream())) {
System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" + user);
String sq2 = "insert into upload (file_name,date,file_data)values(?,?,?)";
pstm1 = con.prepareStatement(sq2);
pstm1.setString(1, fileName);
//pstm1.setString(2, "not set");
// pstm1.setString(3, "not set");
pstm1.setString(2, dateNow);
pstm1.setBinaryStream(3, item.getInputStream(), item.getSize());
pstm1.execute();
} else {
System.out.println(">>>>>>else");
}
} else {
System.out.println("not connected");
}
}
response.sendRedirect("CreateBlocks.html?msg=File Uploaded..");
} catch (Exception ex) {
ex.printStackTrace();
response.sendRedirect("UploadFile.html?msg=Cloud Not Connected");
// log("Error encountered while uploading file", ex);
}
}
这是具有连接方法和上传和下载文件方法的类。此处不使用实际的用户名和密码。
public class SimpleFTPClient {
/** The URL connection object */
private URLConnection m_client;
/** The FTP host/server to be connected */
private String host;
/** The FTP user */
private String user;
/** The FTP user’s password */
private String password;
/** The remote file that needs to be uploaded or downloaded */
private String remoteFile;
/** The previous error message triggered after a method is called */
private String erMesg;
/** The previous success message after any method is called */
private String succMesg;
/**set port number */
private int port;
public SimpleFTPClient() {
}
/** Setter method for the FTP host/server */
public void setHost(String host) {
this.host = host;
}
/** Setter method for the FTP user */
public void setUser(String user) {
this.user = user;
}
/** Setter method for the FTP user’s password */
public void setPassword(String p) {
this.password = p;
}
/** Setter method for the remote file, this must include the sub-directory path relative
to the user’s home directory, e.g you’e going to download a file that is within a sub directory
called "sdir", and the file is named "d.txt", so you shall include the path as "sdir/d.txt"
*/
public void setRemoteFile(String d) {
this.remoteFile = d;
}
/** The method that returns the last message of success of any method call */
public synchronized String getLastSuccessMessage() {
if (succMesg == null) {
return "";
}
return succMesg;
}
/** The method that returns the last message of error resulted from any exception of any method call */
public synchronized String getLastErrorMessage() {
if (erMesg == null) {
return "";
}
return erMesg;
}
/**method to set port number for host */
public void setport(int p)
{
this.port = p;
}
/** The method that handles file uploading, this method takes the absolute file path
of a local file to be uploaded to the remote FTP server, and the remote file will then
be transfered to the FTP server and saved as the relative path name specified in method setRemoteFile
@param localfilename – the local absolute file name of the file in local hard drive that needs to
FTP over
*/
public synchronized boolean uploadFile(InputStream is) {
//public synchronized boolean uploadFile(String localfilename) {
try {
// InputStream is = new FileInputStream(localfilename);
BufferedInputStream bis = new BufferedInputStream(is);
OutputStream os = m_client.getOutputStream();
BufferedOutputStream bos = new BufferedOutputStream(os);
byte[] buffer = new byte[1024];
int readCount;
while ((readCount = bis.read(buffer)) > 0) {
bos.write(buffer, 0, readCount);
}
bos.close();
this.succMesg = "Uploaded!";
return true;
} catch (Exception ex) {
ex.printStackTrace();
StringWriter sw0 = new StringWriter();
PrintWriter p0 = new PrintWriter(sw0, true);
ex.printStackTrace(p0);
erMesg = sw0.getBuffer().toString();
return false;
}
}
/** The method to download a file and save it onto the local drive of the client in the specified absolut path
@param localfilename – the local absolute file name that the file needs to be saved as */
public synchronized boolean downloadFile(String localfilename) {
try {
InputStream is = m_client.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
System.out.println(">>>>>>>>>>>"+localfilename);
OutputStream os = new FileOutputStream(localfilename);
BufferedOutputStream bos = new BufferedOutputStream(os);
byte[] buffer = new byte[1024];
int readCount;
while ((readCount = bis.read(buffer)) > 0) {
bos.write(buffer, 0, readCount);
}
bos.close();
is.close(); // close the FTP inputstream
this.succMesg = "Downloaded!";
return true;
} catch (Exception ex) {
ex.printStackTrace();
StringWriter sw0 = new StringWriter();
PrintWriter p0 = new PrintWriter(sw0, true);
ex.printStackTrace(p0);
erMesg = sw0.getBuffer().toString();
return false;
}
}
/** The method that connects to the remote FTP server */
public synchronized boolean connect() {
try {
URL url = new URL("ftp://" + user + ":" + password + "@" + host + ":" + port + "/" + remoteFile);
m_client = url.openConnection();
System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.."+"ftp://" + user + ":" + password + "@" + host + "/" + remoteFile);
return true;
} catch (Exception ex) {
ex.printStackTrace();
StringWriter sw0 = new StringWriter();
PrintWriter p0 = new PrintWriter(sw0, true);
ex.printStackTrace(p0);
erMesg = sw0.getBuffer().toString();
return false;
}
}
有时我得到误差修改这句话也..
OutputStream os = m_client.getOutputStream();
，这是错误日志 -
java.net.ConnectException: Connection timed out: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.ftp.impl.FtpClient.doConnect(Unknown Source)
at sun.net.ftp.impl.FtpClient.tryConnect(Unknown Source)
at sun.net.ftp.impl.FtpClient.connect(Unknown Source)
at sun.net.ftp.impl.FtpClient.connect(Unknown Source)
at sun.net.www.protocol.ftp.FtpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.ftp.FtpURLConnection.getOutputStream(Unknown Source)
at pdp_cloud.SimpleFTPClient.uploadFile(SimpleFTPClient.java:87)
at pdp_cloud.UploadFile.processRequest(UploadFile.java:161)
at pdp_cloud.UploadFile.doPost(UploadFile.java:223)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1115)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
是URL格式是否正确？ 任何人都可以帮助我..
[为什么“有人可以帮助我？”不是一个实际的问题？]（https://meta.stackoverflow.com/questions/284236/why-is-can-someone-help-me-not-an-实际问题） –
现在它的罚款我想.. –