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在我的PayPal JSP應用程序中，當重定向到PayPal賬戶（https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=EC-50634332TM915520D）時，它不顯示賬戶摘要（如圖中所示）。最後在成功頁面上，它也顯示失敗。 
Paypal和Java：不顯示訂單總結和確認失敗
。 setcheckout.jsp是
<body>
<%
String url = "https://api-3t.sandbox.paypal.com/nvp";
String charset = "UTF-8";
String user = "cinewo_13895465_biz_api1.gmail.com";
String pwd = "1233310405";
String signature = "AbLJtIu5Xk-EeZNM1Qxyhl8A3UcjAXCXJk7gW24OlxsLXL3ORPJX5no3";
//Get the amount here
String amount = "20";
String amt = request.getParameter("amount");
System.out.println("amt : "+amt);
if (amt != null) {
amount = amt;
// Setting amount to session
session.setAttribute("amount", amount);
}
// Please give your ip address here not localhost
// if dont no ip addrress just take google on your sys and search what is my ip it shows give it here
String returnurl = "http://192.168.0.230:8084/Payment/sucess.jsp";
String cancelurl = "http://192.168.0.230:8084/Payment/canceled.jsp";
String query = "USER=" + user + "&PWD=" + pwd + "&SIGNATURE=" + signature + "&PAYMENTREQUEST_0_PAYMENTACTION=Sale&"
+ "PAYMENTREQUEST_0_AMT=" + amount + "&RETURNURL=" + returnurl + "&CANCELURL=" + cancelurl + "&METHOD=SetExpressCheckout"
+ "&VERSION=84.0";
URLConnection connection = new URL(url).openConnection();
connection.setDoOutput(true); // Triggers POST.
connection.setRequestProperty("Accept-Charset", charset);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + charset);
OutputStream output = null;
try {
output = connection.getOutputStream();
output.write(query.getBytes(charset));
} finally {
if (output != null) {
try {
output.close();
} catch (IOException logOrIgnore) {
System.out.println("logOrIgnore : " + logOrIgnore);
}
}
}
InputStream resp = connection.getInputStream();
// StringBufferInputStream buf = new StringBufferInputStream(s);
InputStreamReader reader = new InputStreamReader(resp);
// Read from the input stream.
int charRead;
String outp = "";
char tmp;
while ((charRead = reader.read()) >= 0) {
System.out.print((char) charRead);
tmp = (char) charRead;
outp += Character.toString(tmp);
// out.print((char)charRead);
}
out.println("outp : " + outp);
// Close the InputStreamReader and the
// StringBufferInputStream objects.
resp.close();
reader.close();
String decoded = URLDecoder.decode(outp, charset);
//String n= URLEncoder.encode(outp, charset);
String[] params = decoded.split("&");
String[] eachpair;
HashMap<String, String> hm = new HashMap<String, String>();
for (int i = 0; i < params.length; i++) {
eachpair = params[i].split("=");
hm.put(eachpair[0], eachpair[1]);
}
String ack = "", token = "", version = "", tms = "", bld = "", corelid = "";
out.println("ACK : " + hm.get("ACK"));
ack = hm.get("ACK");
if (ack.equals("Success")) {
token = hm.get("TOKEN");
version = hm.get("VERSION");
tms = hm.get("TIMESTAMP");
bld = hm.get("BUILD");
corelid = hm.get("CORRELATIONID");
String logurl = "https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_express-checkout&token=" + token;
response.sendRedirect(logurl);
}
System.out.println("resp :" + resp);
// final String PAYPAL_URL = "https://api-3t.sandbox.paypal.com/nvp";
%>
<h1>Hello World!</h1>
</body>
和的success.jsp是
<％
String user = "cinewo_13895465_biz_api1.gmail.com";
String pwd = "1325310405";
String signature = "AbLJtIu5Xk-EeZNM1Qxyhl8A3UcjAXCXJk7gW24OlxsLXL3ORPJX5no3";
String payerID = request.getParameter("PayerID");
String token = request.getParameter("token");
String amount = "25";
//Reading amount from session
String amt = session.getAttribute("amount")+"";
if(amt!=""){
amount=amt;
}
String version = request.getParameter("VERSION");
String build = request.getParameter("BUILD");
String charset = "UTF-8";
token = URLEncoder.encode(token, charset);
payerID = URLEncoder.encode(payerID, charset);
String query = "USER=" + user + "&PWD=" + pwd + "&SIGNATURE=" + signature + "&PAYMENTACTION=Sale&"
+ "PAYERID=" + payerID + "&TOKEN=" + token + "&AMT=" + amount + "&METHOD=DoExpressCheckoutPayment"
+ "&VERSION=84.0";
String url = "https://api-3t.sandbox.paypal.com/nvp";
URLConnection connection = new URL(url).openConnection();
connection.setDoOutput(true); // Triggers POST.
connection.setRequestProperty("Accept-Charset", charset);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=" + charset);
OutputStream output = null;
try {
output = connection.getOutputStream();
output.write(query.getBytes(charset));
} finally {
if (output != null) {
try {
output.close();
} catch (IOException logOrIgnore) {
System.out.println("logOrIgnore : " + logOrIgnore);
}
}
}
InputStream resp = connection.getInputStream();
InputStreamReader reader = new InputStreamReader(resp);
// Read from the input stream.
int charRead;
String outp = "";
char tmp;
while ((charRead = reader.read()) >= 0) {
System.out.print((char) charRead);
tmp = (char) charRead;
outp += Character.toString(tmp);
// out.print((char)charRead);
}
String decoded = URLDecoder.decode(outp, charset);
//out.println("decoded : " + decoded);
String[] params = decoded.split("&");
String[] eachpair;
HashMap<String, String> hm = new HashMap<String, String>();
for (int i = 0; i < params.length; i++) {
eachpair = params[i].split("=");
hm.put(eachpair[0], eachpair[1]);
}
String ack = "", corelid = "", tms = "", bld = "";
out.println("ACK : " + hm.get("ACK"));
ack = hm.get("ACK");
if (ack.equals("Success")) {
token = hm.get("TOKEN");
version = hm.get("VERSION");
tms = hm.get("TIMESTAMP");
bld = hm.get("BUILD");
corelid = hm.get("CORRELATIONID");
out.println("token : " + token);
out.println("version : " + version);
out.println("tms : " + tms);
out.println("bld : " + bld);
out.println("corelid : " + corelid);
} else {
out.println("Sorry try again later");
}
// Close the InputStreamReader and the
// StringBufferInputStream objects.
resp.close();
reader.close();
%>
<h1>Hello Sucess</h1>
</body>