Paypal integration in a web application using Java

Question

I want to integrate paypal in my web application. I use the RESTEasy API for quiet requests. I want to know how to integrate paypal into my application. I have dowonloaded paypal java sdk from my website, but right now I do not have a good application that will help me integrate paypal into my application. Can anyone suggest a site that shows the step-by-step procedure for registering PayPal on a website or just understand?

Answer 1

Paypal offers some examples and even a wizard that generates some code for you.

Answer 2

We must follow the step below to configure PayPal in a java web application. Here, I showed the Paypal configuration for Paypal and CreditCard for Paypal.

1. create one account for the sandbox.
2. Create a web application.
3. Enter the following struts2 actions with your code. If you want to use with others, just use the methods and use them directly.

public class PaypalAction extends ActionSupport implements SessionAware { private static final long serialVersionUID = 1L; private String resultString; private String token; @SuppressWarnings("rawtypes") private Map finalMap = new HashMap(); public void paypalPay() { HttpServletRequest request = ServletActionContext.getRequest(); HttpServletResponse response = ServletActionContext.getResponse(); Integer payPercent = 10; Map result = new HashMap(); String data1 = ""; try { data1 = URLEncoder.encode("USER", "UTF-8") + "="+ URLEncoder.encode("Sandbox UserName","UTF-8"); data1 += "&" + URLEncoder.encode("PWD", "UTF-8") + "="+ URLEncoder.encode("Sandbox Password", "UTF-8"); data1 += "&" + URLEncoder.encode("SIGNATURE", "UTF-8") + "="+ URLEncoder.encode("Sandbox Signature","UTF-8"); data1 += "&" + URLEncoder.encode("METHOD", "UTF-8") + "="+ URLEncoder.encode("SetExpressCheckout", "UTF-8"); data1 += "&" + URLEncoder.encode("RETURNURL", "UTF-8") + "=" + URLEncoder.encode(request.getRequestURL().toString().replaceAll(request.getServletPath(), "") + "/successPage","UTF-8"); data1 += "&" + URLEncoder.encode("CANCELURL", "UTF-8") + "="+ URLEncoder.encode(request.getRequestURL().toString().replaceAll(request.getServletPath(), "") + "/failurePage", "UTF-8"); data1 += "&" + URLEncoder.encode("VERSION", "UTF-8") + "="+ URLEncoder.encode("104.0", "UTF-8"); data1 += "&" + URLEncoder.encode("AMT", "UTF-8")+ "=" + URLEncoder.encode("10", "UTF-8"); data1 += "&" + URLEncoder.encode("CURRENCYCODE", "UTF-8") + "=" + URLEncoder.encode("USD", "UTF-8"); data1 += "&" + URLEncoder.encode("L_NAME0", "UTF-8") + "=" + URLEncoder.encode("Sample Test", "UTF-8"); data1 += "&" + URLEncoder.encode("L_AMT0", "UTF-8") + "=" + URLEncoder.encode("10", "UTF-8"); data1 += "&" + URLEncoder.encode("CUSTOM", "UTF-8") + "="+ URLEncoder.encode("Thank You For business","UTF-8"); data1 += "&" + URLEncoder.encode("DESC", "UTF-8") + "=" + URLEncoder.encode("Product Details", "UTF-8"); data1 += "&" + URLEncoder.encode("NOSHIPPING", "UTF-8") + "="+ URLEncoder.encode("1", "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } result = post(data1); Iterator<?> iter = result.entrySet().iterator(); while (iter.hasNext()) { Map.Entry mEntry = (Map.Entry) iter.next(); } if(result!=null){ token = (String) result.get("TOKEN"); String url = "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express"+ "-" + "checkout&token=" + (String) result.get("TOKEN"); try { response.sendRedirect(url); } catch (IOException e) { e.printStackTrace(); } } } public String successPage() { HttpServletRequest request = ServletActionContext.getRequest(); String payerID = request.getParameter("PayerID"); String token=request.getParameter("token"); doPaypalPayment(payerID,token); return "success"; } public String failurePage() { return "failurePage"; } public void doPaypalPayment(String payerID, String token2) { Map result = new HashMap(); String data = ""; try { data1 = URLEncoder.encode("USER", "UTF-8") + "="+ URLEncoder.encode("Sandbox UserName","UTF-8"); data1 += "&" + URLEncoder.encode("PWD", "UTF-8") + "="+ URLEncoder.encode("Sandbox Password", "UTF-8"); data1 += "&" + URLEncoder.encode("SIGNATURE", "UTF-8") + "="+ URLEncoder.encode("Sandbox Signature","UTF-8"); data += "&" + URLEncoder.encode("METHOD", "UTF-8") + "="+ URLEncoder.encode("DoExpressCheckoutPayment", "UTF-8"); data += "&" + URLEncoder.encode("PAYERID", "UTF-8") + "="+ URLEncoder.encode(payerID, "UTF-8"); data += "&" + URLEncoder.encode("PAYMENTACTION", "UTF-8") + "="+ URLEncoder.encode("Sale", "UTF-8"); data += "&" + URLEncoder.encode("TOKEN", "UTF-8") + "="+ URLEncoder.encode(token2, "UTF-8"); data += "&" + URLEncoder.encode("AMT", "UTF-8") + "="+ URLEncoder.encode("10", "UTF-8"); data += "&" + URLEncoder.encode("VERSION", "UTF-8") + "="+ URLEncoder.encode("104.0", "UTF-8"); data += "&" + URLEncoder.encode("CURRENCYCODE", "UTF-8") + "="+ URLEncoder.encode("USD", "UTF-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } result = post(data); } public void deformatNVP() { try { String delims = "[&]"; String equals = "[=]"; String[] tokens = this.resultString.split(delims); for(int i = 0; i < tokens.length; i++) { String[] newTokens = tokens[i].split(equals); this.finalMap.put(URLDecoder.decode(newTokens[0], "UTF-8"), URLDecoder.decode(newTokens[1], "UTF-8")); } } catch (Exception e) { System.out.println(e.toString()); } //return finalMap; } public Map post(String data) { try { //Connect to the url URL url = new URL("https://api-3t.sandbox.paypal.com/nvp"); URLConnection conn = url.openConnection(); conn.setDoOutput(true); OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream()); //Post the data wr.write(data); wr.flush(); // Get the response BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream())); this.resultString = rd.readLine(); deformatNVP(); wr.close(); rd.close(); } catch (Exception e) { System.out.println(e.toString()); } return finalMap; } @Override public void setSession(Map<String, Object> arg0) { // TODO Auto-generated method stub } public void doPaypalPaymentWithCreditCard() { try { //Load the caller service //Create a new map to hold the result Map result = new HashMap(); // Construct data request string String data1 = URLEncoder.encode("USER", "UTF-8") + "="+ URLEncoder.encode("Sandbox UserName","UTF-8"); data1 += "&" + URLEncoder.encode("PWD", "UTF-8") + "="+ URLEncoder.encode("Sandbox Password", "UTF-8"); data1 += "&" + URLEncoder.encode("SIGNATURE", "UTF-8") + "="+ URLEncoder.encode("Sandbox Signature","UTF-8"); data += "&" + URLEncoder.encode("METHOD", "UTF-8") + "=" + URLEncoder.encode("DoDirectPayment", "UTF-8"); data += "&" + URLEncoder.encode("AMT", "UTF-8") + "=" + URLEncoder.encode("20.10", "UTF-8"); data += "&" + URLEncoder.encode("VERSION", "UTF-8") + "=" + URLEncoder.encode("80.0", "UTF-8"); data += "&" + URLEncoder.encode("IPADDRESS", "UTF-8") + "=" + URLEncoder.encode("192.168.1.0", "UTF-8"); data += "&" + URLEncoder.encode("PAYMENTACTION", "UTF-8") + "=" + URLEncoder.encode("Sale", "UTF-8"); data += "&" + URLEncoder.encode("CREDITCARDTYPE", "UTF-8") + "=" + URLEncoder.encode("Visa", "UTF-8"); data += "&" + URLEncoder.encode("ACCT", "UTF-8") + "=" + URLEncoder.encode("4532513511140817", "UTF-8"); data += "&" + URLEncoder.encode("EXPDATE", "UTF-8") + "=" + URLEncoder.encode("102014", "UTF-8"); data += "&" + URLEncoder.encode("CVV2", "UTF-8") + "=" + URLEncoder.encode("123", "UTF-8"); data += "&" + URLEncoder.encode("FIRSTNAME", "UTF-8") + "=" + URLEncoder.encode("Jason", "UTF-8"); data += "&" + URLEncoder.encode("LASTNAME", "UTF-8") + "=" + URLEncoder.encode("Michels", "UTF-8"); data += "&" + URLEncoder.encode("STREET", "UTF-8") + "=" + URLEncoder.encode("123", "UTF-8"); data += "&" + URLEncoder.encode("CITY", "UTF-8") + "=" + URLEncoder.encode("Papillion", "UTF-8"); data += "&" + URLEncoder.encode("STATE", "UTF-8") + "=" + URLEncoder.encode("NE", "UTF-8"); data += "&" + URLEncoder.encode("ZIP", "UTF-8") + "=" + URLEncoder.encode("68046", "UTF-8"); data += "&" + URLEncoder.encode("COUNTRYCODE", "UTF-8") + "=" + URLEncoder.encode("US", "UTF-8"); result = post(data); //This will iterate through the entire response map Iterator iter = result.entrySet().iterator(); while (iter.hasNext()) { Map.Entry mEntry = (Map.Entry) iter.next(); System.out.println(mEntry.getKey() + " : " + mEntry.getValue()); } //Now that you have a response check to see if it is a success String ack = "" + result.get("ACK"); if("Success".equals(ack)) { System.out.println("Congratulations your transaction was a success"); } else { System.out.println("There was an error with your request."); } } catch (Exception e) { System.out.println(e.toString()); } }//end of main function } 

This works great for me. Hope this helps those who want to set up payment via paypal.