java - Trying to test connection on localhost ports using Socket and get ConnectException -

-

A simple test using the socket to test which port is available for TCP service on my local machine Writing java program. Here is my code: 

 for  (int i = 0; i & lt; 1024; i ++) {try {// test Availability InetAddress addr = InetAddress.getLocalHost (); Socket s = new socket (adr, i); System.out.println ("port is a server" + "+" localhost. ");} Hold (IOException e) {e.printStackTrace (); breakdown;}}   < p> And when I'm getting:  
  java.net.ConnectException: connect: The address on the local machine is invalid or not valid on the port on the remote machine at java.net.DualStackPlainSocketImpl.connect0 java.net.DualStackPlainSocketImpl.socketConnect (java.net) on java.net.AbstractPlainSocketImpl.doCannect (unknown source) java.net.AbstractPlainSocketImpl.connectToAddress (Unknown Source) java.net.AbstractPlainSocketImpl.connect (unknown source) java.net .java.net (Unknown Source) at PlainSocketImpl.connect .SocksSocketImpl.connect (unknown source) on java.net.Socket.connect (unknown source) Launch Java at .net.Socket.java.net.Socket (unknown source). & Lt; init & gt; (unknown Source) at java.net.Socket. & Lt; init & gt; (unknown source) on main.Portscreen.main (PortScanner.java: 19)   
 I'm new to socket And do I need to start a socket server in response to my search? Or what should I really do to scan my ports? Thanks for your reply.   
 
 
 You are trying to establish a client connection from port 0 that is not possible. If you bind the server side socket to port 0, then the system will automatically give an independent port above 1024. Thus a server socket will never listen to port 0. Unfortunately I did not find a document about this. Other operating systems may behave differently.  
 Your second question: If you are turning off a port you will get an exception.

Comments

Post a Comment

Popular posts from this blog

Pass DB Connection parameters to a Kettle a.k.a PDI table Input step dynamically from Excel -

-
Image
I have a requirement whenever I run my own kettle, dynamically took database connection parameters from an excel source Every run should go. I have an Excel column names: hostname, username, database, password. I want to pass these connection parameters to my table input stage dynamically whenever it runs the job. This is what I was trying to do. You can get it Connection parameters from the DB reading source (for example Excel or a CSV file in my example) < / Li> Store the parameters in the variable Using the variable in your connection's settings. Setting Variables Create another conversion for (you can not do it in the same conversion Uses): set variables element variable: The element that reads / writes your data creates a new connection and sets the connection parameter using $ {variable name_} Note that you will need to type in the field field in the field $ {password} Also keep in mind that this can be a security problem as the
Read more

multithreading - PhantomJS-Node in a for Loop -

-
I am trying to implement a screen-scraps application that opens a URL in which a parameter changes as it is for a loop: var data = [ '100', '101', '102', '103', '104']; (Var indexA = 0; indexA & lt; data.length; indexA ++) for {Phantom Generation ({'port': freeport}, function (pH) {ph.create page (function (page) {page.open ("http: //...++ data [index B] +" ... " , Status {console.log ("open site:" + data [index B], position); / * OLD * / indexB ++; page evaluation (function () {// page scrape and an object Return}, function {console.log (result.dataRequest); // here is the problem}); / * new and fixed * / indexB ++} first console Logs it: Open Site: 100 Success Opens Site: 101 Success B Ola Site: 102 Success Opening Site: 103 Success Opened Site: 104 Success Which is good. Data is verified in scrap HTML and from index to array Matches. So in page 101 I scrap '101 and retrieve' and pu
Read more

c++ - MATLAB .m file to .mex file using Matlab Compiler -

-
I know that it can speak as a very famous topic, but something that helps me with it Not found This scenario is: I have my functions function, no matter what's inside, it's a generic function that may depend on other toolboxes. Does. Has input and output; I want to generate the same myFun.mex function; : Lib myFun This way I get some new files: libmyfun.c libmyfun.dll Libmyfun.exp libmyfun.exports libmyfun .h libmyfun.lib Reading around and I think that Creating a myfun.cpp that is very famous is included: / * gateway function * / zero max function (ent NLHS, MXARRA * PLS [], int NRHS, CONST M Xeray * PHS []) Here is the Variable Deals * / / * code here * /} I have tried to do this and are called Regular of Max Generation: Max ('- v', 'myfun.cpp') But I get many errors, and I should say that my myfun.cpp copy / Paste Function is where I have a lot of doubts ... especially on input / output management. My q
Read more