I’m sure while working on Java Web Project, you must have faced these kind of questions:
- How to get HTTP response code for a URL in Java?
- How to check if a URL exists or returns 404 with Java?
- How can I read the status code of a HTTP request?
- How to get HTTP code from org.apache.http.HttpResponse?
- How to check if my Tomcat is up and running?
Well, below simple Java Program will answer all your mentioned questions. Do let me know if you see any problem.
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package com.crunchify.tutorials; import java.io.IOException; import java.net.HttpURLConnection; import java.net.URL; /** * @author Crunchify.com * */ public class CrunchifyGetPingStatus { public static void main(String args[]) throws Exception { String[] hostList = { "https://crunchify.com", "http://yahoo.com", "http://www.ebay.com", "http://google.com", "http://www.example.co", "https://paypal.com", "http://bing.com/", "http://techcrunch.com/", "http://mashable.com/", "http://thenextweb.com/", "http://wordpress.com/", "http://wordpress.org/", "http://example.com/", "http://sjsu.edu/", "http://ebay.co.uk/", "http://google.co.uk/", "http://www.wikipedia.org/", "http://en.wikipedia.org/wiki/Main_Page" }; for (int i = 0; i < hostList.length; i++) { String url = hostList[i]; String status = getStatus(url); System.out.println(url + "\t\tStatus:" + status); } } public static String getStatus(String url) throws IOException { String result = ""; try { URL siteURL = new URL(url); HttpURLConnection connection = (HttpURLConnection) siteURL .openConnection(); connection.setRequestMethod("GET"); connection.connect(); int code = connection.getResponseCode(); if (code == 200) { result = "Green"; } } catch (Exception e) { result = "->Red<-"; } return result; } } |
Output:
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https://crunchify.com Status:Green http://yahoo.com Status:Green http://www.ebay.com Status:Green http://google.com Status:Green http://www.example.co Status:->Red<- https://paypal.com Status:Green http://bing.com/ Status:Green http://techcrunch.com/ Status:Green http://mashable.com/ Status:Green http://thenextweb.com/ Status:Green http://wordpress.com/ Status:Green http://wordpress.org/ Status:Green http://example.com/ Status:Green http://sjsu.edu/ Status:Green http://ebay.co.uk/ Status:Green http://google.co.uk/ Status:Green http://www.wikipedia.org/ Status:Green http://en.wikipedia.org/wiki/Main_Page Status:Green |
If you are interested on more than 10 java tutorials then check this out.
Giving red for every website
What error are you getting Harsh?
Not getting any error but getting red status for all websites
Working now but getting connection time out error for one URL
What was an issue Harsh? I’m glad it’s working now.
Hi,
Really helpful article.. But how can we change this code to be operated in a Proxy based network?? How to insert information related to IP, Port, Username , Password Etc. Do explain it please…
Thanks..
Great scenario. I’ll look at your requirement in details and update.
Exception in thread “main” java.lang.NoClassDefFoundError: CrunchifyGetPingStatu
s (wrong name: com/crunchify/tutorials/CrunchifyGetPingStatus)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
1)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: CrunchifyGetPingStatus. Program will exit.
Hi there – It’s complaining about main class 🙂 This happens when you have Eclipse environment and Java issue.
Hello, please can explain to me please the role of this program ??
Exactly the same purpose as “Pingdom: https://www.pingdom.com/” 🙂