How to use cURL in Java

Question

I am a newbie in java and wanted to use curl in java  What is my question is curl built-in in java or I have to install it from any 3rd party source to use with Java  If so  how to install curl in java  I have been googling for a long time but didnt find any help  Hope anyone can help me out there    Thanks in advance

User · Answer

Using standard java libs  I suggest looking at the HttpUrlConnection class http   java sun com javase 6 docs api java net HttpURLConnection html  It can handle most of what curl can do with setting up the connection  What you do with the stream is up to you

User · Answer

You can make use of java net URL and or java net URLConnection  URL url   new URL  quot https   stackoverflow com quot     try  BufferedReader reader   new BufferedReader new InputStreamReader url openStream     quot UTF-8 quot           for  String line   line   reader readLine       null             System out println line            Also see the Oracle s simple tutorial on the subject  It s however a bit verbose  To end up with less verbose code  you may want to consider Apache HttpClient instead  By the way  if your next question is  quot How to process HTML result  quot   then the answer is  quot Use a HTML parser  No  don t use regex for this  quot   See also   How to use java net URLConnection to fire and handle HTTP requests  What are the pros and cons of the leading Java HTML parsers

User · Answer

Use Runtime to call Curl  This code works for both Ubuntu and Windows   String   commands   new String   curl    -X    GET    http   checkip amazonaws com    Process process   Runtime getRuntime   exec commands   BufferedReader reader   new BufferedReader new  InputStreamReader process getInputStream      String line  String response  while   line   reader readLine       null        response append line

User · Answer

Curl is a non-java program and must be provided outside your Java program   You can easily get much of the functionality using Jakarta Commons Net  unless there is some specific functionality like  resume transfer  you need  which is tedious to code on your own

User · Answer

Some people have already mentioned HttpURLConnection  URL and URLConnection  If you need all the control and extra features that the curl library provides you  and more   I d recommend Apache s httpclient

User · Answer

The Runtime object allows you to execute external command line applications from Java and would therefore allow you to use cURL however as the other answers indicate there is probably a better way to do what you are trying to do  If all you want to do is download a file the URL object will work great

[java] How to use cURL in Java?

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