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I need to call a servlets POST method from another servlet and pass a blob in the servlets parameters. Is this posible, if so how can it be done. PS: I cant use Apache HttpClient
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The forward() method is used to transfer the client request to another resource (HTML file, servlet, jsp etc). When this method is called, the control is transferred to the next resource called.
You can use URLConnection to call your servlet resides in another application on same server or other server. To call servlet you need to pass URL of that servlet, you can pass query parameter to servlet and read resonse from that servlet. Sample Code : URLConnection connection = new URL("Servlet URL" ).
Difference between forward() and sendRedirect() methodThe forward() method works at server side. The sendRedirect() method works at client side. It sends the same request and response objects to another servlet. It always sends a new request.
Interface RequestDispatcher. Defines an object that receives requests from the client and sends them to any resource (such as a servlet, HTML file, or JSP file) on the server.
You need to create and send a HTTP request yourself. You cannot make use of forward/redirect/include because you want to change the method from GET to POST and you want to send a multipart/form-data request.
As HttpClient (and other 3rd party library?) is apparently not an option, your best bet is to use the standard Java SE API provided java.net.URLConnection. Long story short: Using java.net.URLConnection to fire and handle HTTP requests At the bottom you can find a multipart/form-data example.
Please note that this problem is not specific to servlets. In other words, you must be able to execute this code in a plain vanilla Java application with a main() method. This allows for easier testing and finetuning. Once you get it to work, just let the servlet execute the same piece of code.
Unrelated to the problem, I have the impression that there's a major design failure somewhere, certainly if the both servlets runs in the same webapplication context. The other servlet where you want to send the POST request to is apparently too tight coupled and should be refactored.
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