Android使用HttpURLConnection简单的获取百度的首页源码失败？
就是想很简单的获取百度的源码，开了一个子线程，却不知到为什么一直获取失败。求高手告之原因。
代码：
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>
百度有可能反扒虫，你的请求设置一下user agent试试
你的这个程序需要注意这么几点，网络权限，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);
应该放在if语句里面，然后读取的时候我建议你写成byte[]类型，容易转化，还有，数据尽量用接口回调去处理，这样清晰而且不容易报错
应该用HTTPS去访问 然后就是访问权限
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("https://www.baidu.com/");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
if (connection.getResponseCode() == 200) {
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));
StringBuffer response = new StringBuffer();
String line;
while ((line = reader.readLine()) != null) {
response.append(line + "\n");
}
in.close();
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();
}
connection.setDoInput(true);
connection.setDoOutput(true);
将这两个去掉就行了，具体原因请查询api 。希望你采纳，
不知道你的错误信息是什么？这段代码本身没什么问题，百度现在是https的访问协议。看到网上一个分析的是错误码是302的问题。如下：302也已经提示你问题所在了，你访问的URL地址有问题，百度现在是全站https，所以你应该使用https://www.baidu.com来进行测试，但http://www.baidu.com在浏览器上又能访问到页面，是什么问题呢？这是因为百度做了跳转，自动给你跳转到https://www.baidu.com上，这个跳转由一个302页面来进行，动作很快，基本察觉不到。这就是为什么你得到302而不200。
是否配置网络权限
HttpClient写起来更简单