就是想很简单的获取百度的源码,开了一个子线程,使用HttpURLConnection,却不知到为什么一直获取失败。求高手告之原因。
public class MainActivity extends Activity implements View.OnClickListener
{
public static final int SHOW_RESPONSE = 0;
private Button sendRequest;
private TextView responseText;
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_RESPONSE:
String response = (String) msg.obj;
// 在这里进行UI操作,将结果显示到界面上
responseText.setText(response);
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.web_layout);
sendRequest = (Button) findViewById(R.id.send_request);
responseText = (TextView) findViewById(R.id.response_text);
sendRequest.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.send_request) {
sendRequestWithHttpURLConnection();
}
}
private void sendRequestWithHttpURLConnection() {
// 开启线程来发起网络请求
new Thread(new Runnable() {
@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL("http://www.baidu.com/");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
connection.setDoInput(true);
connection.setDoOutput(true);
if(connection.getResponseCode()!=200)
{
Log.d("haha", "code is "+connection.getResponseCode());
}
InputStream in = connection.getInputStream();
// 下面对获取到的输入流进行读取
BufferedReader reader = new BufferedReader(
new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
Message message = new Message();
message.what = SHOW_RESPONSE;
// 将服务器返回的结果存放到Message中
message.obj = response.toString();
handler.sendMessage(message);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
}).start();
}
}
布局代码:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/send_request"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Send Request" />
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/response_text"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>
</LinearLayout>
log里没有任何异常信息报出,url的返回码为302.
真的很疑惑,因为代码检查过很多次了觉得没有问题,求助!!!!!
There is nothing wrong with this code itself. 302 has also informed you of the problem. There is something wrong with the URL address you visited. Baidu now uses full-site https, so you should use
https://www.baidu.com
来进行测试,但http://www.baidu.com
You can access the page on the browser again. What is the problem? Woolen cloth? This is because Baidu makes a jump and automatically jumps you to https://www.baidu.com. This jump is performed by a 302 page. The action is very fast and is basically undetectable. That's why you get 302 instead of 200.What the person above said is right.
So you need to do two things:
Replace the url with: https://www.baidu.com
Replace URLConnection, HttpURLConnection with HttpsURLConnection.