I am writing a code that connects to websites and checks some code, like a crawler. But I need to connect trough a proxy and change the IP address (so it doesn't show the client's IP in the server logs).
How can this be done through java?
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27hmm you sound like your up to something good.stevebot– stevebot2011-01-05 00:58:27 +00:00Commented Jan 5, 2011 at 0:58
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4 Answers
You can use the java system properties to set up a proxy or pass it as command line options.
You can find some details and samples here.
Ex: Before opening the connection
System.setProperty("http.proxyHost", "myProxyServer.com");
System.setProperty("http.proxyPort", "80");
Or you can use the default network proxies configured in the sytem
System.setProperty("java.net.useSystemProxies", "true");
Since Java 1.5 you can create a instance of proxy and pass it to the openConnection() method.
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("123.0.0.1", 8080));
URL url = new URL("http://www.yahoo.com");
HttpURLConnection uc = (HttpURLConnection)url.openConnection(proxy);
uc.connect();
Or as lisak suggested, you can use some 3rd party libraries which supports your need better.
2 Comments
talawahtech
You should also note that the proxy configuration for HTTPS uses a slightly different property eg. System.setProperty("https.proxyHost", "myProxyServer.com");. I was wondering why this wasn't working for me at first and it was because my code uses HTTPS.
Stefan
Why is there no Proxy.Type.HTTPS (secure) constant at all?
Or you can also use HttpClient which would suit your needs better. Check out the documentation, it's brief and very informative.
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpHost proxy = new HttpHost("someproxy", 8080);
httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);
1 Comment
David Lakatos
Tutorial here: link
Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("123.0.0.1", 8080));
URL url = new URL("http://www.yahoo.com");
HttpURLConnection uc = (HttpURLConnection)url.openConnection(proxy);
uc.connect();
This worked for me. I was able to use the proxy for the specific connection or transfer. Earlier we were using System.setProperty which used to set it at system level and all the requests internal/external started using the same proxy.
Also Proxy.Type.HTTP works for both http and https
Comments
For me it worked by adding below line before opening connection.
System.setProperty("java.net.useSystemProxies", "true");
In case you need to use a specific proxy you can even set that in system properties.
