HttpPost可以在Java项目中运行，但不能在Android上运行
我已经为我的Android设备编写了一些代码，用于通过HTTPS登录网站并从结果页面中解析出一些数据。首先执行HttpGet获取登录所需的一些信息，然后执行HttpPost执行实际登录过程。
下面的代码在Eclipse中的Java项目中工作得很好，该项目的构建路径上有以下JAR文件：httpcore-4.1-beta2.jar、httpclient-4.1-alpha2.jar、httpmime-4.1-alpha2.jar和commons-logging-1.1.1.jar。
public static MyBean gatherData(String username, String password) {
MyBean myBean = new MyBean();
try {
HttpResponse response = doHttpGet(URL_PAGE_LOGIN, null, null);
System.out.println("Got login page");
String content = EntityUtils.toString(response.getEntity());
String token = ContentParser.getToken(content);
String cookie = getCookie(response);
System.out.println("Performing login");
System.out.println("token = "+token +" || cookie = "+cookie);
response = doLoginPost(username,password,cookie, token);
int respCode = response.getStatusLine().getStatusCode();
if (respCode != 302) {
System.out.println("ERROR: not a 302 redirect!: code is ""+ respCode+""");
if (respCode == 200) {
System.out.println(getHeaders(response));
System.out.println(EntityUtils.toString(response.getEntity()).substring(0, 500));
}
} else {
System.out.println("Logged in OK, loading account home");
// redirect handler and rest of parse removed
}
}catch (Exception e) {
System.out.println("ERROR in gatherdata: "+e.toString());
e.printStackTrace();
}
return myBean;
}
private static HttpResponse doHttpGet(String url, String cookie, String referrer) {
try {
HttpClient client = new DefaultHttpClient();
client.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
client.getParams().setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, "UTF-8");
HttpGet httpGet = new HttpGet(url);
httpGet.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
httpGet.setHeader(HEADER_USER_AGENT,HEADER_USER_AGENT_VALUE);
if (referrer != null && !referrer.equals("")) httpGet.setHeader(HEADER_REFERER,referrer);
if (cookie != null && !cookie.equals("")) httpGet.setHeader(HEADER_COOKIE,cookie);
return client.execute(httpGet);
} catch (Exception e) {
e.printStackTrace();
throw new ConnectException("Failed to read content from response");
}
}
private static HttpResponse doLoginPost(String username, String password, String cookie, String token) throws ClientProtocolException, IOException {
try {
HttpClient client = new DefaultHttpClient();
client.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
client.getParams().setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, "UTF-8");
HttpPost post = new HttpPost(URL_LOGIN_SUBMIT);
post.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);
post.setHeader(HEADER_USER_AGENT,HEADER_USER_AGENT_VALUE);
post.setHeader(HEADER_REFERER, URL_PAGE_LOGIN);
post.setHeader(HEADER_COOKIE, cookie);
post.setHeader("Content-Type","application/x-www-form-urlencoded");
List<NameValuePair> formParams = new ArrayList<NameValuePair>();
formParams.add(new BasicNameValuePair("org.apache.struts.taglib.html.TOKEN", token));
formParams.add(new BasicNameValuePair("showLogin", "true"));
formParams.add(new BasicNameValuePair("upgrade", ""));
formParams.add(new BasicNameValuePair("username", username));
formParams.add(new BasicNameValuePair("password", password));
formParams.add(new BasicNameValuePair("submit", "Secure+Log+in"));
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams,HTTP.UTF_8);
post.setEntity(entity);
return client.execute(post);
} catch (Exception e) {
e.printStackTrace();
throw new ConnectException("ERROR in doLoginPost(): "+e.getMessage());
}
}
服务器(不在我的控制之下)在登录成功时返回302重定向，如果登录失败则返回200并重新加载登录页面。当使用上面的JAR文件运行时，我会得到302重定向，但是，如果我在Android项目中运行与构建路径上的1.6 Android JAR文件完全相同的代码，我会从服务器得到200响应。在我的2.2设备上运行代码时，我得到相同的200响应。
我的Android应用程序有互联网权限，HttpGet工作正常。我认为问题出在HttpPost(或其他一些类)在Android JAR版本和更新的Apache版本之间有一些显著的不同。
我尝试将Apache库添加到Android项目的构建路径中，但是由于重复的类，我在日志中收到如下消息：INFO/dalvikvm(390): DexOpt: not resolving ambiguous class 'Lorg/apache/http/impl/client/DefaultHttpClient;'。我还尝试使用MultipartEntity而不是UrlEncodedFormEntity，但得到相同的200结果。
所以，我有几个问题：
- 我是否可以强制在Android下运行的代码优先使用更新的Apache库，而不是Android版本？
- 如果没有，有人知道如何更改我的代码以使其与Android JAR文件一起工作吗？
- 是否有其他完全不同的方法在Android中执行HttpPost？
- 还有其他想法吗？
我已经readalotofpostsANDcode，但是我什么都没拿到。
解决方案
我现在已经放弃了使用HttpClient路由在android上运行时从服务器给出预期的响应。相反，我重写了上面的doPost方法，改为使用HttpsURLConnection。这里是新的(正在运行的)版本，希望它对某些人有用。
private static LoginBean altPost(String username, String password, String cookie, String token){
LoginBean loginBean = new LoginBean();
HttpsURLConnection urlc = null;
OutputStreamWriter out = null;
DataOutputStream dataout = null;
BufferedReader in = null;
try {
URL url = new URL(URL_LOGIN_SUBMIT);
urlc = (HttpsURLConnection) url.openConnection();
urlc.setRequestMethod("POST");
urlc.setDoOutput(true);
urlc.setDoInput(true);
urlc.setUseCaches(false);
urlc.setAllowUserInteraction(false);
urlc.setRequestProperty(HEADER_USER_AGENT, HEADER_USER_AGENT_VALUE_FF);
urlc.setRequestProperty("Cookie", cookie);
urlc.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
String output = "org.apache.struts.taglib.html.TOKEN="+ URLEncoder.encode(token, HTTP.UTF_8)
+"&showLogin=true&upgrade=&username="+ URLEncoder.encode(username, HTTP.UTF_8)
+"&password="+ URLEncoder.encode(password, HTTP.UTF_8)+"&submit="
+URLEncoder.encode("Secure+Log+in", HTTP.UTF_8);
dataout = new DataOutputStream(urlc.getOutputStream());
// perform POST operation
dataout.writeBytes(output);
// get response info
loginBean.setResponseCode(urlc.getResponseCode());
// get required headers
String headerName = null;
StringBuffer newCookie = new StringBuffer(100);
String redirectLocation = "";
for (int i=1; (headerName = urlc.getHeaderField(i)) != null;i++) {
if (headerName.indexOf(COOKIE_VALUE_SESSION) > -1) {
if (newCookie.length() > 0) {newCookie.append("; ");}
newCookie.append(headerName);
}
if (headerName.indexOf(COOKIE_VALUE_AUTH) > -1) {
if (newCookie.length() > 0) {newCookie.append("; ");}
newCookie.append(headerName);
}
if (headerName.indexOf("https://") > -1) {
redirectLocation = headerName;
}
}
loginBean.setCookie(newCookie.toString());
loginBean.setRedirectUrl(redirectLocation);
in = new BufferedReader(new InputStreamReader(urlc.getInputStream()),8096);
String response;
// write html to System.out for debug
while ((response = in.readLine()) != null) {
System.out.println(response);
}
in.close();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (in != null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return loginBean;
}
我仍然不知道HttpClient方式无法正常工作的原因。
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