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HttpURLConnection

 
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Hi,

I want to read content of the web site through java program. I am using HttpURLConnection class. But I am unable to view the contents. I got code from net "Html source viewer". But what if website is in php, jsp etc.
Any pointers ??

Thanks,
Anand
 
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Reading the content of a web page could be as simple as:


It doesn't matter whether the web site is written in JSP, PHP or Fortran, because either way you're going to get HTML delivered back to you.
[ March 22, 2007: Message edited by: Ulf Dittmer ]
 
Anand Loni
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Hi Ulf,

Solution given by you is not working. See the stack trace below :
java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:507)
at java.net.Socket.connect(Socket.java:457)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:365)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:477)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:214)
at sun.net.www.http.HttpClient.New(HttpClient.java:287)
at sun.net.www.http.HttpClient.New(HttpClient.java:299)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:792)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:744)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:669)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:913)
at java.net.URLConnection.getContent(URLConnection.java:682)
at java.net.URL.getContent(URL.java:1021)
at Tp.main(Tp.java:20)
 
Java Cowboy
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Are you behind a proxy?

Connect through a Proxy
Java Tip 42: Write Java apps that work with proxy-based firewalls

The official documentation: Networking Properties
 
Anand Loni
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Thanks a lot, Jesper.
 
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I am not able to execute below program. Please help.
I have set my proxies as class variables which i did not specify here.
When i used this URL in browser it is working perfectly fine.
https://chart.googleapis.com/chart?cht=lc&chtt=This%20is%20%7C%20my%20graph&chs=300x300&chxt=y&chd=t%3A40%2C20%2C50%2C20%2C200





When executed this code. It is throwing ConnectionRefused Exception..


java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(Unknown Source)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.<init>(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.New(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getOutputStream(Unknown Source)
at com.perse.swing.browser.SSlPost.getPOSTUrl(SSlPost.java:108)
at com.perse.swing.browser.SSlPost.main(SSlPost.java:35)


 
Ulf Dittmer
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What does "not able to execute" mean? What, exactly, are you trying to do, and what, exactly, is the result? TellTheDetails
 
Sri Palem
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I edited my previous post and pasted exception there. Please have a look.
 
Ulf Dittmer
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Does the proxy handle HTTPS? Have you tried with HTTP instead of HTTPS?

Also, use System.setProperty("...", "...") instead of your approach.
 
Sri Palem
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Thank you so much . I used http instead of https and it worked.
 
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connectionURL = new URL("http://" + localAddr + reportUrl);

logger.debug("ReportThread ConnectionURL: " + connectionURL+connectionURL.getPort());
HttpURLConnection httpURLConnection;
try {
httpURLConnection = (HttpURLConnection) connectionURL.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("GET");
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(),"ISO-8859-1"));






here am getting below exception why it is getting and also the host name how i will get..?

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:524)
at java.net.Socket.connect(Socket.java:474)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:523)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:231)
at sun.net.www.http.HttpClient.New(HttpClient.java:304)
at sun.net.www.http.HttpClient.New(HttpClient.java:321)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:839)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:791)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:716)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:883)
at com.ys.drx.ui.web.reports.actions.ReportThread.run(ReportThread.java:61)
 
soumya Uppula
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soumya Uppula wrote:connectionURL = new URL("http://" + localAddr + reportUrl);

logger.debug("ReportThread ConnectionURL: " + connectionURL+connectionURL.getPort());
HttpURLConnection httpURLConnection;
try {
httpURLConnection = (HttpURLConnection) connectionURL.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setRequestMethod("GET");
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpURLConnection.getInputStream(),"ISO-8859-1"));






here am getting below exception why it is getting and also the host name how i will get..?

java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.Socket.connect(Socket.java:524)
at java.net.Socket.connect(Socket.java:474)
at sun.net.NetworkClient.doConnect(NetworkClient.java:157)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:388)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:523)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:231)
at sun.net.www.http.HttpClient.New(HttpClient.java:304)
at sun.net.www.http.HttpClient.New(HttpClient.java:321)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:839)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:791)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:716)
at sun.net.www.protocol.http.HttpURLConnection.getOutputStream(HttpURLConnection.java:883)
at com.ys.drx.ui.web.reports.actions.ReportThread.run(ReportThread.java:61)

Untitled.png
[Thumbnail for Untitled.png]
 
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Some questions: 1) Is the URL correct? 2) Is it reachable from wherever this code is run? 3) Does or does it not work with a publicly reachable URL you can share with us?
 
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