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我有下面的代碼是使用jsoup來解析html。如何在android中使用jsoup發送POST？
package com.example.descov2;
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 javax.net.ssl.HttpsURLConnection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
private List<String> cookies;
private HttpsURLConnection conn;
private final String USER_AGENT = "Mozilla/5.0";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
new DownloadFilesTask().execute();
} catch (Exception e) {
// TODO: handle exception
Log.v("mango", e.getMessage());
}
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
return rootView;
}
}
private class DownloadFilesTask extends AsyncTask<Void, Integer, String> {
protected String doInBackground(Void... urls) {
String rt = "";
try {
String url = "https://www.desco.org.bd/ebill/login.php";
String gmail = "https://www.desco.org.bd/ebill/homepage.php";
HttpUrlConnectionExample http = new HttpUrlConnectionExample();
// 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);
System.out.println(page);
String postParams = http.getFormParams(page,
"[email protected]", "777777");
// 2. Construct above post's content and then send a POST
// request
// for
// authentication
http.sendPost(
"https://www.desco.org.bd/ebill/authentication.php",
postParams);
// 3. success then go to gmail.
String result = http.GetPageContent(gmail);
System.out
.println(http
.GetPageContent("https://www.desco.org.bd/ebill/homepage.php"));
System.out.println(result);
System.out
.println(http
.GetPageContent("https://www.desco.org.bd/ebill/billinformation.php"));
rt = http
.GetPageContent("https://www.desco.org.bd/ebill/billinformation.php");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return rt;
}
protected void onProgressUpdate(Integer... progress) {
}
protected void onPostExecute(String result) {
}
}
public class HttpUrlConnectionExample {
public List<String> cookies;
public HttpsURLConnection conn;
public final String USER_AGENT = "Mozilla/5.0";
public void sendPost(String url, String postParams) throws Exception {
URL obj = new URL(url);
conn = (HttpsURLConnection) obj.openConnection();
// Acts like a browser
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Host", "https://www.desco.org.bd");
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 (this.cookies != null) {
for (String cookie : this.cookies) {
conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
}
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Referer",
"https://www.desco.org.bd/ebill/login.php");
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());
}
public String GetPageContent(String url) throws Exception {
URL obj = new URL(url);
conn = (HttpsURLConnection) 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);
}
in.close();
// Get the response cookies
setCookies(conn.getHeaderFields().get("Set-Cookie"));
Document tdoc = Jsoup.parse(response.toString());
Elements ele = tdoc
.select("table table tr:nth-child(4) td:nth-child(2) span");
System.out.println(ele.text());
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);
// Google form id
Element loginform = doc.select("form").first();// getElementById("body");
Elements inputElements = loginform.getElementsByTag("input");
List<String> paramList = new ArrayList<String>();
for (Element inputElement : inputElements) {
String key = inputElement.attr("name");
String value = inputElement.attr("value");
if (key.equals("username"))
value = "22006500";
else if (key.equals("login"))
value = "Login";
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;
}
}
}
應用清單
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.descov2"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.descov2.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
int responseCode = conn.getResponseCode();
public void sendPost(String url, String postParams) throws Exception {
URL obj = new URL(url);
conn = (HttpsURLConnection) obj.openConnection();
// Acts like a browser
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Host", "https://www.desco.org.bd");
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 (this.cookies != null) {
for (String cookie : this.cookies) {
conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
}
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Referer",
"https://www.desco.org.bd/ebill/login.php");
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();// this line is throws exception
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());
}
問題發生
line 在一般的個人電腦上，這工作正常，我得到的響應代碼爲200.但是，當在Android上運行，這給了我400.我不知道這裏有什麼錯。任何幫助非常感謝和要求。 我發現有同樣的問題link 
我建議你比較Android <->服務器和服務器<->桌面之間交換的標頭。否則，服務器可能不明白Android向他發送的內容。 – Stephan