我正在创建一个可以执行多次登录的程序。我还将为每个登录提供将项目添加到购物车和购买的功能。该代码目前正在为一个帐户工作，这是非常基本的。我不得不删除一些私人信息，但代码仍然应该清楚。再说一遍，我只是想知道我应该采取什么方法进行多次登录？这段代码在大多数情况下看起来最适合速度吗？如果结帐返回500，我如何处理重试尝试？此代码目前仅针对单次登录进行设置。此外，我发现没有多少文章可以正确清理HttpClient。至少，我不认为我发现的教程非常有信誉。
再次感谢您花时间阅读本文，我只是想学习其他实践来改进我的代码并采用适当的多线程技术。
关于我的代码的更多详细信息，当您查看页面时会检索到令牌，令牌会在整个程序中存储和使用。
class example {
private static List<Header> headers = new ArrayList<Header>();
private static BasicCookieStore cookieStore = new BasicCookieStore();
private static CloseableHttpClient httpClient = HttpClientBuilder.create().setDefaultHeaders(headers).setDefaultCookieStore(cookieStore).build();
public static void main(String[] args) throws Exception {
String loginURL = "...";
String productUrl = "...";
String userid = "";
String password = "";
String formKey = "";
int size = 9;
Boolean debug = true;
JsonElement product;
headers.add(new BasicHeader("Host", "..."));
headers.add(new BasicHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"));
headers.add(new BasicHeader("Accept-Language", "en-us"));
headers.add(new BasicHeader("Content-Encoding", "gzip, deflate"));
headers.add(new BasicHeader("Content-Type", "Application/x-www-form-urlencoded"));
headers.add(new BasicHeader("User-Agent", "Mozilla/5.0 (iPhone; CPU iPhone OS 8_4_1 like Mac OS X) "
+ "AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12H321 Safari/600.1.4"));
headers.add(new BasicHeader("Connection", "keep-alive"));
Scanner in = new Scanner(System.in);
Gson gson = new Gson();
System.out.println("Select Profile\n1. ...\n2. Custom");
int select = in.nextInt();
switch(select) {
case 1:
userid = "...";
password = "...";
break;
// Custom Account Login
case 2:
System.out.println("Enter User_ID:");
userid = in.next();
System.out.println("Enter Password:");
password = in.next();
break;
}
int input = 0;
do {
input = in.nextInt();
switch(input) {
case 99:
debug = true;
break;
// View Menu.
case 0:
System.out.println("...");
break;
// Initiate Session
case 1:
// Retrieve formKey for login page.
formKey = getLogin(GetPageContent(loginURL));
session(formKey, userid, password, debug);
System.out.println("Press 0 to View Menu");
break;
case 2:
product = getProduct(GetPageContent(productUrl));
// Retrieve Product ID
Product productInfo = gson.fromJson(product.getAsJsonObject(), Product.class);
// Retrieve Color
Product[] color = gson.fromJson(product.getAsJsonObject().getAsJsonObject("attributes").getAsJsonObject("92").getAsJsonArray("options"), Product[].class);
// Prepare product request
String productKey = productInfo.getProductId();
String colorId = color[0].getId();
String postUrl = productInfo.getPostUrl();
// Execute addToCart
String result = addToCart(formKey, postUrl, productKey, colorId, size, debug);
break;
case 3:
String result2 = checkout(formKey);
break;
}
} while(input != 0);
}
public static void session(String formKey, String userid, String password, Boolean debug) {
HttpPost post = new HttpPost("...");
try {
// Package the data
StringEntity entity = new StringEntity("...");
post.setEntity(entity);
// Execute the data
HttpResponse response = httpClient.execute(post);
} catch (Exception e) {
e.printStackTrace();
} finally {
post.releaseConnection();
System.out.println("Login execution completed.");
}
}
public static String addToCart(String formKey, String postUrl, String productId, String colorId, int size, Boolean debug) {
String result = "";
HttpPost post = new HttpPost(postUrl);
try {
StringEntity entity = new StringEntity("...");
post.setEntity(entity);
// Execute the data
HttpResponse response = httpClient.execute(post);
System.out.println("Response Code : "
+ response.getStatusLine().getStatusCode());
// RETURN RESULT
result = EntityUtils.toString(response.getEntity());
if(debug) {
System.out.println("LOG: " + result);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
post.releaseConnection();
System.out.println("Adding to cart execution completed.");
}
return result;
}
public static String GetPageContent(String url) throws Exception {
StringBuffer result = null;
HttpGet request = new HttpGet(url);
try {
HttpResponse response = httpClient.execute(request);
int responseCode = response.getStatusLine().getStatusCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader rd = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
result = new StringBuffer();
String line = "";
while ((line = rd.readLine()) != null) {
result.append(line);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
request.releaseConnection();
}
return result.toString();
}
public static String getLogin(String html) {
String formKey = "";
Document doc = Jsoup.parse(html);
Element loginform = doc.getElementById("login-form");
Elements inputElements = loginform.getElementsByTag("input");
for (Element inputElement : inputElements) {
String key = inputElement.attr("name");
String value = inputElement.attr("value");
if (key.equals("form_key"))
formKey = value;
}
return formKey;
}
public static JsonObject getProduct(String html)
throws UnsupportedEncodingException {
Document doc = Jsoup.parse(html);
System.out.println("Extracting form's data...");
Element form = doc.getElementById("product_addtocart_form");
Elements formElements = form.getElementsByTag("input");
String rawScript = form.getElementsByTag("script").html();
String script = "{" + rawScript.substring(rawScript.lastIndexOf("g({") + 3, rawScript.indexOf("}});")) + "}}";
// Create JSON object
JsonElement jelement = new JsonParser().parse(script.trim());
JsonObject jobject = jelement.getAsJsonObject();
jobject = jobject.getAsJsonObject();
// Retrieve post link.
jobject.addProperty("postUrl", form.attr("action"));
return jobject;
}
public static String checkout(String formKey) {
HttpPost post = new HttpPost("...");
String result = "";
try {
StringEntity entity = new StringEntity("...");
post.setEntity(entity);
HttpResponse response = httpClient.execute(post);
int status = response.getStatusLine().getStatusCode();
if(status == 200) {
result = EntityUtils.toString(response.getEntity());
System.out.println("Checkout Result: " + result);
} else if(status == 302) {
System.out.println("Checkout failed, Code: 302.");
} else if(status == 404) {
System.out.println("Checkout failed, Code: 404.");
} else if(status == 500) {
(insert retry step here)
System.out.println("Webserver is probably down. Code, 500.");
}
} catch (Exception e) {
e.printStackTrace();
}
finally {
post.releaseConnection();
}
return result;
}
}