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祝您有美好的一天！我是新來的Java。我用java編寫了一個程序來登錄到一個HTTP PHP網站。當我運行程序時，它不會登錄。它只是顯示初始登錄頁面本身的內容，而不是登錄後出現的頁面。我不知道我的錯誤是什麼。我在網上以及在這個網站上搜索了很多。但對我來說沒有運氣。 。:(編寫一個java程序登錄到HTTP PHP網站
這是我的計劃，請讓我知道，如果有在任何錯誤
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.net.HttpURLConnection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class HttpUrlConnectionExample1 {
private List<String> cookies;
private HttpURLConnection conn;
private final String USER_AGENT = "Mozilla/5.0";
public static void main(String[] args) throws Exception {
String url = "http://www.iwhatgroups.com/log%20in.php";
String email = "http://www.iwhatgroups.com";
HttpUrlConnectionExample1 http = new HttpUrlConnectionExample1();
// make sure cookies is turn on
CookieHandler.setDefault(new CookieManager());
// 1. Send a "GET" request, so that you can extract the form's data.
String page = http.GetPageContent(url);
String postParams = http.getFormParams(page, "MyUserId", "MyPassWord");
// 2. Construct above post's content and then send a POST request for
// authentication
http.sendPost(url, postParams);
// 3. success then go to email.
String result = http.GetPageContent(email);
System.out.println(result);
}
private void sendPost(String url, String postParams) throws Exception {
URL obj = new URL(url);
conn = (HttpURLConnection) obj.openConnection();
// Acts like a browser
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Host", "iwhatgroups.com");
conn.setRequestProperty("User-Agent", USER_AGENT);
// conn.setRequestProperty("Accept",
// "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
// conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
// for (String cookie : this.cookies) {
// conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
// }
// conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Referer", "http://iwhatgroups.com");
// conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
// conn.setRequestProperty("Content-Length", Integer.toString(postParams.length()));
conn.setDoOutput(true);
conn.setDoInput(true);
// Send post request
DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
wr.writeBytes(postParams);
wr.flush();
wr.close();
int responseCode = conn.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + url);
System.out.println("Post parameters : " + postParams);
System.out.println("Response Code : " + responseCode);
BufferedReader in =
new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
// System.out.println(response.toString());
}
private String GetPageContent(String url) throws Exception {
URL obj = new URL(url);
conn = (HttpURLConnection) obj.openConnection();
// default is GET
conn.setRequestMethod("GET");
conn.setUseCaches(false);
// act like a browser
conn.setRequestProperty("User-Agent", USER_AGENT);
conn.setRequestProperty("Accept",
"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
if (cookies != null) {
for (String cookie : this.cookies) {
conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
}
}
int responseCode = conn.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in =
new BufferedReader(new InputStreamReader(conn.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
System.out.println(inputLine);
}
in.close();
// Get the response cookies
setCookies(conn.getHeaderFields().get("Set-Cookie"));
return response.toString();
}
public String getFormParams(String html, String username, String password)
throws UnsupportedEncodingException {
System.out.println("Extracting form's data...");
Document doc = Jsoup.parse(html);
// Form id
Element loginform = doc.getElementById("mainBody");
Elements inputElements = loginform.getElementsByTag("div");
List<String> paramList = new ArrayList<String>();
for (Element inputElement : inputElements) {
String key = inputElement.attr("name");
String value = inputElement.attr("value");
if (key.equals("inputEmail"))
value = username;
else if (key.equals("inputPassword"))
value = password;
paramList.add(key + "=" + URLEncoder.encode(value, "UTF-8"));
}
// build parameters list
StringBuilder result = new StringBuilder();
for (String param : paramList) {
if (result.length() == 0) {
result.append(param);
} else {
result.append("&" + param);
}
}
return result.toString();
}
public List<String> getCookies() {
return cookies;
}
public void setCookies(List<String> cookies) {
this.cookies = cookies;
}
}
謝謝大家閱讀或回答這個
注意：如果我取消調用setRequestProperty它引發NullPointerException異常，否則（我的意思是，如果我評論他們）它給人的登錄頁面。請儘可能幫助我。
再次感謝。
如果您使用的是jsoup，那麼您可以通過執行類似http://stackoverflow.com/questions/6432970/jsoup-posting-and-cookie來簡化您的代碼 – Pshemo