商业源码 服务器代码错误530是什么意思？
530是未登录。
530 Sorry, the maximum number of clients (3) from your host are already connected，这种情况从报错的意思是说：对不起，最大客户数（3）从你的主机已经连接，那么出现的这个原因就是您本地的ftp工具的问题，或者是用户本地的连接质量不好导致的。
扩展资料：
状态代码（也称作错误代码），指为服务器所接收每个请求（网页点击）分配的 3 位数代码。多数有效网页点击都有状态代码 200（"正常"）。"网页未找到"错误会生产 404 错误。某些常见的代码以粗体显示。
1、500（服务器内部错误）
服务器遇到错误，无法完成请求。
2、501（尚未实施）
服务器不具备完成请求的功能。例如，当服务器无法识别请求方法时，服务器可能会返回此代码。
3、502（错误网关）
服务器作为网关或代理，从上游服务器收到了无效的响应。
4、503（服务不可用）
目前无法使用服务器（由于超载或进行停机维护）。通常，这只是一种暂时的状态。
5、504（网关超时）
服务器作为网关或代理，未及时从上游服务器接收请求。
6、505（HTTP 版本不受支持）
服务器不支持请求中所使用的 HTTP 协议版本。
-状态代码
'windows xp+sp3,vb60 编译通过
Option Explicit
'拨号/断网
Private Declare Function InternetDial Lib "wininetdll" (ByVal hwndParent As Long, ByVal lpszConnectoid As String, ByVal dwFlags As Long, lpdwConnection As Long, ByVal dwReserved As Long) As Long
Private Declare Function InternetHangUp Lib "wininetdll" (ByVal dwConnection As Long, ByVal dwReserved As Long) As Long
Private Declare Function InternetAutodial Lib "wininetdll" (ByVal dwFlags As Long, ByVal dwReserved As Long) As Long
Private Declare Function InternetAutodialHangup Lib "wininetdll" (ByVal dwReserved As Long) As Long
Private Const INTERNET_DIALSTATE_DISCONNECTED = 1
Private Const INTERNET_AUTODIAL_FORCE_ONLINE = 1
Private Const INTERNET_AUTODIAL_FORCE_UNATTENDED = 2
Private Const INTERNET_DIAL_UNATTENDED = &H8000
Private Handle As Long
'网络状态
Private Declare Function InternetGetConnectedStateEx Lib "wininetdll" Alias "InternetGetConnectedStateExA" (ByRef lpdwFlags As Long, ByVal lpszConnectionName As String, ByVal dwNameLen As Long, ByVal dwReserved As Long) As Long
Private Declare Function InternetGetConnectedState Lib "wininetdll" (ByRef dwFlags As Long, ByVal dwReserved As Long) As Long
Private Const INTERNET_CONNECTION_MODEM As Long = &H1 '本系统使用调制解调器与因特网相连
Private Const INTERNET_CONNECTION_LAN As Long = &H2 '本系统通过LAN与因特网相连
Private Const INTERNET_CONNECTION_PROXY As Long = &H4 '本系统使用proxy代理服务器与因特网相连
Private Const INTERNET_CONNECTION_MODEM_BUSY As Long = &H8 '未使用
Private Const INTERNET_RAS_INSTALLED As Long = &H10
Private Const INTERNET_CONNECTION_OFFLINE As Long = &H20
Private Const INTERNET_CONNECTION_CONFIGURED As Long = &H40
'枚举网络连接
Private Const RAS_MaxDeviceType = 16
Private Const RAS95_MaxDeviceName = 128
Private Const RAS95_MaxEntryName = 256
Private Type RASCONN95
dwSize As Long
hRasConn As Long
szEntryName(RAS95_MaxEntryName) As Byte
szDeviceType(RAS_MaxDeviceType) As Byte
szDeviceName(RAS95_MaxDeviceName) As Byte
End Type
Private Type RASENTRYNAME95
dwSize As Long
szEntryName(RAS95_MaxEntryName) As Byte
End Type
Private Declare Function RasEnumConnections Lib "rasapi32dll" Alias "RasEnumConnectionsA" (lprasconn As Any, lpcb As Long, lpcConnections As Long) As Long
Private Declare Function RasEnumEntries Lib "rasapi32dll" Alias "RasEnumEntriesA" (ByVal reserved As String, ByVal lpszPhonebook As String, lprasentryname As Any, lpcb As Long, lpcEntries As Long) As Long
Private Declare Function RasHangUp Lib "rasapi32dll" Alias "RasHangUpA" (ByVal hRasConn As Long) As Long
'拨号
Public Function DialUp(LinkName As String) As Boolean
InternetDial 0, LinkName, INTERNET_AUTODIAL_FORCE_UNATTENDED, Handle, 0
DialUp = (Handle <> 0)
End Function
'断网
Public Sub HangUp()
If Handle <> 0 Then
InternetHangUp Handle, 0
Handle = 0
End If
End Sub
'枚举网络连接
Public Sub EnumConnectName(Value() As String)
Dim s As Long, l As Long, ln As Long, a As String
ReDim r(255) As RASENTRYNAME95
r(0)dwSize = 264
s = 256 r(0)dwSize
l = RasEnumEntries(vbNullString, vbNullString, r(0), s, ln)
ReDim Value(ln - 1)
For l = 0 To ln - 1
a = StrConv(r(l)szEntryName(), vbUnicode)
Value(l) = Left$(a$, InStr(a$, Chr$(0)) - 1)
Next
End Sub
'判断是否在线
Public Function Online() As Boolean
Online = InternetGetConnectedState(0&, 0&)
End Function
'判断是否在线并返回连接方式
Public Property Get OnlineOfLinkName(LinkName As String) As Boolean
LinkName = Space$(128)
OnlineOfLinkName = InternetGetConnectedStateEx(0, LinkName, 128, 0&)
End Property
'如果是通过LAN的连接，则返回True
Public Function IsNetConnectViaLAN() As Boolean
Dim dwFlags As Long
Call InternetGetConnectedState(dwFlags, 0&)
IsNetConnectViaLAN = dwFlags And INTERNET_CONNECTION_LAN
End Function
'如果是通过调制解调器的连接，则返回True
Public Function IsNetConnectViaModem() As Boolean
Dim dwFlags As Long
Call InternetGetConnectedState(dwFlags, 0&)
IsNetConnectViaModem = dwFlags And INTERNET_CONNECTION_MODEM
End Function
'如果是通过Proxy代理服务器的连接，则返回True
Public Function IsNetConnectViaProxy() As Boolean
Dim dwFlags As Long
Call InternetGetConnectedState(dwFlags, 0&)
IsNetConnectViaProxy = dwFlags And INTERNET_CONNECTION_PROXY
End Function
'如果已安装了RAS，则返回True
Public Function IsNetRASInstalled() As Boolean
Dim dwFlags As Long
Call InternetGetConnectedState(dwFlags, 0&)
IsNetRASInstalled = dwFlags And INTERNET_RAS_INSTALLED
End Function
'返回当前网络状态信息字符串
Public Function GetNetConnectString() As Boolean
Dim dwFlags As Long
Dim Msg As String
If InternetGetConnectedState(dwFlags, 0&) Then
If dwFlags And INTERNET_CONNECTION_CONFIGURED Then
Msg = MsgBox("系统配置了网络连接") & vbCrLf
End If
If dwFlags And INTERNET_CONNECTION_LAN Then
Msg = MsgBox("系统通过局域网与因特网相连接")
End If
If dwFlags And INTERNET_CONNECTION_PROXY Then
Msg = MsgBox("并使用了Proxy代理服务")
End If
If dwFlags And INTERNET_CONNECTION_MODEM Then
Msg = MsgBox("系统使用调制解调器与因特网相连接")
End If
If dwFlags And INTERNET_CONNECTION_OFFLINE Then
Msg = MsgBox("系统当前处于离线状态")
End If
If dwFlags And INTERNET_CONNECTION_MODEM_BUSY Then
Msg = MsgBox("系统的调制解调器未连接到因特网")
End If
If dwFlags And INTERNET_RAS_INSTALLED Then
Msg = MsgBox("本系统安装了远程访问服务")
End If
GetNetConnectString = True
Else
Msg = MsgBox("当前未与因特网相连")
GetNetConnectString = False
End If
End Function
Private Sub Command1_Click()
GetNetConnectString
End Sub
404页面是客户端在浏览网页时，服务器无法正常提供信息，或是服务器无法回应，且不知道原因所返回的页面。
404 的含义：第一个 4 表示客户端出错；第二个 0 表示你把网址打错了；最后表示这个错误代码在 4 开头的错误代码中排行老四。
Room 404，一般表示的是 4 楼第四个房间。在 CERN （欧洲粒子物理研究所）是找不到这个房间的，因为在 CERN 第一个数 4 表示的第四栋楼，第二个数表示的不是第几层，后面两个数字合起来表示的办公室的编号，而第四号楼是没有编号为 04 的办公室的。
扩展资料
1、据说在第三次科技革命之前，互联网的形态就是一个大型的中央数据库，这个数据库就设置在404房间里面。那时候所有的请求都是由人工手动完成的，如果在数据库中没有找到请求者所需要的文件，或者由于请求者写错了文件编号，用户就会得到一个返回信息：room 404 : file not found。
2、网站设置404页面后，如果网站出现死链接，搜索引擎蜘蛛爬行这类网址得到“404”状态回应时，即知道该URL已经失效，便不再索引该网页，并向数据中心反馈将该URL表示的网页从索引数据库中删除。避免因为死链接影响网站收录。
参考资料
404页面--
NPM start 需要在packagejson中定义，运行命令需要在nodejs环境下运行。
E:\workSpace\nodejs\helloworld>npm start
> helloworld@000 start E:\workSpace\nodejs\helloworld
> node /bin/www
GET / 304 564566 ms - -
GET /stylesheets/stylecss 304 2819 ms - -
如何利用NPM包管理工具中的命令操作：
1、第一步，查看npm有关的命令，可以使用npm h，如下图所示：
2、第二步，查看对包的控制权限，可以使用npm access，如下图所示：
3、第三步，如果添加用户相关信息，可以使用npm add-user，如下图所示：
4、第四步，查看api帮助文档，使用命令npm apihelp，如下图所示：
5、第五步，查看作者或创建人，使用npm author命令，如下图所示：
6、第六步，查看npm安装的可执行文件路径，使用npm bin命令，如下图所示：
import javaxservlet;
import javaxservlethttp;
import javaio;
import javautil;
import javaxxmlparsers;
import javaxxmltransform;
import orgw3cdom;
import orgxmlsax;
import javaxxmltransformdomDOMSource;
import javaxxmltransformstreamStreamResult;
public class CreateXMLForEnterServelet extends HttpServlet {
private static final String CONTENT_TYPE = "text/html; charset=GBK";
//Initialize global variables
public void init() throws ServletException {
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
responsesetContentType(CONTENT_TYPE);
PrintWriter out = responsegetWriter();
//获取传递过来的值
String databaseType = requestgetParameter("select");
String userName = requestgetParameter("userName");
String userPassword = requestgetParameter("userPassword");
String dbName = requestgetParameter("dbName");
String dbSouse = requestgetParameter("dbSouces");
int port = IntegerparseInt(requestgetParameter("portNum"));
Document doc;
Element root;
try
{
DocumentBuilderFactory dbf = DocumentBuilderFactorynewInstance();
DocumentBuilder db = dbfnewDocumentBuilder();
String path = requestgetRealPath("/");
File file = new File( path + "/" + "DBInfoxml");
if(!fileexists())
{
doc = dbnewDocument();
root = doccreateElement("DBInfo");
docappendChild(root);
}
else
{
doc = dbparse(file);
root = docgetDocumentElement();
}
//添加子节点
Element rowNode = doccreateElement(databaseType);
rootappendChild(rowNode);
Node node = doccreateElement("Driver");
Node nodestr = doccreateElement("ConnectString");
Node serverName = doccreateElement("ServerName");
Node nodeName = doccreateElement("UserName");
Node nodePWD = doccreateElement("PassWord");
Node nodePort = doccreateElement("Port");
Node nodeDB = doccreateElement("DataBase");
rowNodeappendChild(node);
rowNodeappendChild(nodestr);
rowNodeappendChild(serverName);
rowNodeappendChild(nodeDB);
rowNodeappendChild(nodeName);
rowNodeappendChild(nodePWD);
rowNodeappendChild(nodePort);
String nodeValue;//Driver
String nodeConStr;//连接字符串
if(databaseTypeequals("ORACLE"))
{
nodeValue = "oraclejdbcdriverOracleDriver";
nodeConStr = "jdbc:oracle:thin";
}
else
{
nodeValue = "commicrosoftjdbcsqlserverSQLServerDriver";
nodeConStr = "jdbc:microsoft:sqlserver";
}
Text text = doccreateTextNode(nodeValue);
Text textstr = doccreateTextNode(nodeConStr);
Text textName = doccreateTextNode(userName);
Text textPWD = doccreateTextNode(userPassword);
Text textServer = doccreateTextNode(dbName);
Text textPort = doccreateTextNode(StringvalueOf(port));
Text textDB = doccreateTextNode(dbSouse);
nodeappendChild(text);
nodestrappendChild(textstr);
nodeNameappendChild(textName);
nodePWDappendChild(textPWD);
serverNameappendChild(textServer);
nodePortappendChild(textPort);
nodeDBappendChild(textDB);
DOMSource doms = new DOMSource(doc);
StreamResult sr = null;
TransformerFactory tff = TransformerFactorynewInstance();
Transformer tf = tffnewTransformer();
sr = new StreamResult(file);
tftransform(doms,sr);
outprintln("<h1>Create XMLFile Is Ok!!</h1>");
requestgetRequestDispatcher("indexjsp")forward(request,response);
}
catch(Exception ex)
{
outprintln("<h1>生成 XML 配置文件时出现错误：</h1><br/><h4>"+ex+"</h4>");
outprintln("<br/><br/>");
outprint("<a href='indexjsp'>点这里回到首页</a>");
}
outclose();
}
//Process the HTTP Post request
public void doPost(HttpServletRequest request, HttpServletResponse response) throws
ServletException, IOException {
doGet(request, response);
}
//Clean up resources
public void destroy() {
}
}
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