get content of http request in REST web service using java

You can inject context about the individual requests. As an example, the code snippet below shows how the HTTP request headers can be injected.

@GET  
@Produces{"text/plain"}  
public String listHeaderNames(@Context HttpHeaders headers) {  
  StringBuilder buf = new StringBuilder();  
  for (String header: headers.getRequestHeaders().keySet()) {  
    buf.append(header);  
    buf.append("\n");  
  }  
  return buf.toString();  
}

See the relevant part of the JAX-RS 1.1 specification for more information.

Look at Restlet

// Create the client resource  
ClientResource resource = new ClientResource("http://www.restlet.org");  

// Write the response entity on the console
resource.get().write(System.out);