我实际上必须阅读并使用Android应用中某些网站的内容。到目前为止，我主要使用两种不同的代码来获取网站的内容，但它们对我不起作用
public static String connect(String url)
{
String result = "bubububu" ;
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url);
// Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
// Examine the response status
Log.i("Praeda",response.getStatusLine().toString());
// Get hold of the response entity
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
result= convertStreamToString(instream);
// now you have the string representation of the HTML request
instream.close();
return result ;
}
} catch (Exception e) {
e.getMessage() ;
}
return result ;
}
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
public static String connect(String url)
{
String result = "bubububu" ;
HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(url);
// Execute the request
HttpResponse response;
try {
response = httpclient.execute(httpget);
// Examine the response status
Log.i("Praeda",response.getStatusLine().toString());
// Get hold of the response entity
HttpEntity entity = response.getEntity();
// If the response does not enclose an entity, there is no need
// to worry about connection release
if (entity != null) {
// A Simple JSON Response Read
InputStream instream = entity.getContent();
result= convertStreamToString(instream);
// now you have the string representation of the HTML request
instream.close();
return result ;
}
} catch (Exception e) {
e.getMessage() ;
}
return result ;
}
private static String convertStreamToString(InputStream is) {
/*
* To convert the InputStream to String we use the BufferedReader.readLine()
* method. We iterate until the BufferedReader return null which means
* there's no more data to read. Each line will appended to a StringBuilder
* and returned as String.
*/
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = null;
try {
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
和
private String DownloadText(String URL)
{
int BUFFER_SIZE = 2000;
InputStream in = null;
try {
in = OpenHttpConnection(URL);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return "";
}
InputStreamReader isr = new InputStreamReader(in);
int charRead;
String str = "";
char[] inputBuffer = new char[BUFFER_SIZE];
try {
while ((charRead = isr.read(inputBuffer))>0)
{
//---convert the chars to a String---
String readString = String.copyValueOf(inputBuffer, 0, charRead);
str += readString;
inputBuffer = new char[BUFFER_SIZE];
}
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "";
}
return str;
}
private InputStream OpenHttpConnection(String urlString)
throws IOException
{
InputStream in = null;
int response = -1;
URL url = new URL(urlString);
URLConnection conn = url.openConnection();
if (!(conn instanceof HttpURLConnection))
throw new IOException("Not an HTTP connection");
try{
HttpURLConnection httpConn = (HttpURLConnection) conn;
httpConn.setAllowUserInteraction(false);
httpConn.setInstanceFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.connect();
response = httpConn.getResponseCode();
if (response == HttpURLConnection.HTTP_OK) {
in = httpConn.getInputStream();
}
}
catch (Exception ex)
{
throw new IOException("Error connecting");
}
return in;
}
这两个都让我例外。 第一个给出例外 response = httpclient.execute（httpget）和exception.getMessage（）为“null”，而第二个在httpConn.setAllowUserInteraction（false）中给出异常，而exception.getMessage（）为Error连接。即使我在清单文件中使用了Internet权限
答案 0 :(得分：2)
这部分代码可以帮助您：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
new HttpTask().execute("http://www.google.com");
}
public String getWebPage(String adresse) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet();
InputStream inputStream = null;
String response = null;
try {
URI uri = new URI(adresse);
httpGet.setURI(uri);
HttpResponse httpResponse = httpClient.execute(httpGet);
int statutCode = httpResponse.getStatusLine().getStatusCode();
int length = (int) httpResponse.getEntity().getContentLength();
Log.v(LOG_THREAD_ACTIVITY, "HTTP GET: " + adresse);
Log.v(LOG_THREAD_ACTIVITY, "HTTP StatutCode: " + statutCode);
Log.v(LOG_THREAD_ACTIVITY, "HTTP Lenght: " + length + " bytes");
inputStream = httpResponse.getEntity().getContent();
Reader reader = new InputStreamReader(inputStream, "UTF-8");
int inChar;
StringBuffer stringBuffer = new StringBuffer();
while ((inChar = reader.read()) != -1) {
stringBuffer.append((char) inChar);
}
response = stringBuffer.toString();
} catch (ClientProtocolException e) {
Log.e(LOG_THREAD_ACTIVITY, "HttpActivity.getPage() ClientProtocolException error", e);
} catch (IOException e) {
Log.e(LOG_THREAD_ACTIVITY, "HttpActivity.getPage() IOException error", e);
} catch (URISyntaxException e) {
Log.e(LOG_THREAD_ACTIVITY, "HttpActivity.getPage() URISyntaxException error", e);
} finally {
try {
if (inputStream != null)
inputStream.close();
} catch (IOException e) {
Log.e(LOG_THREAD_ACTIVITY, "HttpActivity.getPage() IOException error lors de la fermeture des flux", e);
}
}
return response;
}
private class HttpTask extends AsyncTask<String, Integer, String> {
@Override
protected String doInBackground(String... urls) {
// TODO Auto-generated method stub
String response = getWebPage(urls[0]);
return response;
}
@Override
protected void onPostExecute(String response) {
Log.i(LOG_THREAD_ACTIVITY, "HTTP RESPONSE" + response);
textViewConsole.setText(response);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
@Override
protected void onProgressUpdate(Integer... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
}