java ftp上传文件小程序测试出错,好急!

Question

HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:372)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause java.lang.NullPointerException
org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:441)
org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:520)
org.apache.commons.net.ftp.FTP.user(FTP.java:670)
org.apache.commons.net.ftp.FTPClient.login(FTPClient.java:637)
org.apache.jsp.ftpUploadTest_jsp.UploadFile(ftpUploadTest_jsp.java:44)
org.apache.jsp.ftpUploadTest_jsp._jspService(ftpUploadTest_jsp.java:153)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.
--------------------------------------------------------------------------------

Answer 1

忘了告诉大家,我的运行环境是:eclipse3.1+tomcat5.0+jdk1.42,请高手及时出现吧.现身吧

Answer 2

下面这句不能这样写,要单独定义server和port
 private String server = "192.9.100.88:2121";改成这样:private String server = "192.9.100.88";
         int port = "2121";
另外你调用方法传递的值错了public class Upload
{
private String server = "192.9.100.88";//先在自己的机上设一个FTP站点吧 private String username = "username";//登录名 private String password = "password";//密码 private String local = "E:\\ww.txt";//FTP站点目录 private String remote = "E:\\ftp";//要传的文件.  // 不使用默认的端口
private int port = 2121; public int getPort()
{
return port;
} public void setPort(int port)
{
this.port = port;
} public String getLocal()
{
return local;
} public void setLocal(String local)
{
this.local = local;
} public String getPassword()
{
return password;
} public void setPassword(String password)
{
this.password = password;
} public String getRemote()
{
return remote;
} public void setRemote(String remote)
{
this.remote = remote;
} public String getServer()
{
return server;
} public void setServer(String server)
{
this.server = server;
} public String getUsername()
{
return username;
} public void setUsername(String username)
{
this.username = username;
} public boolean UploadFile(String server, String username, String password,
String local, String remote ,int port)
{ FTPClient ftp = new FTPClient();
int reply;
try
{
ftp.connect(server,port);
reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply))
{
ftp.disconnect();
return false;
}
} catch (IOException e)
{
if (ftp.isConnected())
{
try
{
ftp.disconnect();
} catch (IOException f)
{
return false;
}
}
} try
{
if (!ftp.login(username, password))
{
ftp.logout();
return false;
}
ftp.setFileType(FTP.BINARY_FILE_TYPE);
ftp.enterLocalPassiveMode();
//这个地方暂不做修改
String[] dirArray = remote.split("/");
if (dirArray.length > 1)
{
for (int i = 0; i < dirArray.length - 1; i++)
{
if (dirArray[i] != null && dirArray[i] != null)
if (!ftp.changeWorkingDirectory(dirArray[i]))
{
ftp.makeDirectory(dirArray[i]);
ftp.changeWorkingDirectory(dirArray[i]);
}
}
}
File file = new File(local);
if(!file.exists()||!file.canRead()||file.isDirectory()){
return false;
}
InputStream input = new FileInputStream(file);
ftp.storeFile(file.getName(), input);
input.close();
ftp.logout();
} catch (FTPConnectionClosedException e)
{
return false;
} catch (IOException e)
{
return false;
} finally
{
if (ftp.isConnected())
{
try
{
ftp.disconnect();
} catch (IOException f)
{
return false;
}
}
}
return true;
} public static void main(String args[])
{
Upload ud = new Upload();
ud.UploadFile(ud.getServer(), ud.getUsername(),  ud
.getPassword(), ud.getLocal(), ud.getRemote(),ud.getPort());
}}这样试试