jaxrpcstockquoteserviceclient.java

Oracle的J2EE Sample

/*
 * @author  : Elangovan
 * @version : 1.0
 *
 * Development Environment : Oracle9i JDeveloper
 * Name of the File        : JAXRPCStockQuoteServiceClient.java
 *
 * Creation / Modification History
 *    Elangovan        19-Aug-2003        Created
 *
 */
package oracle.otnsamples.ibfbs.admin.helper;

import javax.xml.rpc.Stub;

import javax.servlet.http.HttpServletRequest;

import java.util.StringTokenizer;

import java.rmi.RemoteException;

import oracle.otnsamples.ibfbs.admin.helper.wsclient.StockQuoteService;
import oracle.otnsamples.ibfbs.admin.helper.wsclient.StockQuoteEJB_Impl;

import oracle.otnsamples.ibfbs.admin.exception.AdminHelperException;
import oracle.otnsamples.ibfbs.utils.ConnectionParams;

/**
 * This class is a JAX-RPC client for Stock Quote Web Service hosted by FBS.
 * It uses a JAX-RPC static stub to invoke the Web Service.
 */
public class JAXRPCStockQuoteServiceClient {
  
  /**
   * This method invokes the 'getQuote' method on the Web Service with the
   * specified symbols and returns the corresponding stock rates. JAX-RPC Web
   * Services support array as input/output parameters.
   * 
   * @param req HTTP Servlet request containing the stock symbols
   * @return Stock rate for the specified symbols 
   * @throws if Web Service invocation fails
   */
  public Float[] getQuote(HttpServletRequest req)  
    throws AdminHelperException {
  
    // Get the symbols 
    String symbols = req.getParameter("SYMBOLS").trim();
    
    // Individual symbols will be seperated by comma (,)
    // Use tokenizer and construct an array of symbols
    StringTokenizer tokens = new StringTokenizer(symbols, ",");
    
    int len = tokens.countTokens();
    String symbolArr[] = new String[len];
    
    for(int i=0;i<len;i++) 
      symbolArr[i] = tokens.nextToken().trim();
    try {
      // Get a reference to the stub
      Stub stub = (Stub) new StockQuoteEJB_Impl().getStockQuoteServicePort();
      
      // Set the ENDPOINT address
      stub._setProperty(javax.xml.rpc.Stub.ENDPOINT_ADDRESS_PROPERTY,ConnectionParams.endpointURL);

      StockQuoteService quoteService = (StockQuoteService) stub;

      req.setAttribute("SYMBOLS",symbolArr);    
      
      // Invoke the service and return the rates
      return quoteService.getStockQuote(symbolArr);
      
    } catch(RemoteException remoteEx) {
      throw new AdminHelperException (" Error accessing web service : "+remoteEx.toString());
    }
  }
  
}