String urlStr = "nana.com/nana/api/v1"
HttpURLConnection conn = null;
BufferedReader rd = null;
StringBuilder sb = null;
try {
URL url = new URL(urlStr);
conn = (HttpURLConnection) url.openConnection();
if (conn.getResponseCode() != 200) {
throw new IOException(conn.getResponseMessage());
}
else {
rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
sb = new StringBuilder();
String line;
while ((line = rd.readLine()) != null) {
sb.append(line);
}
rd.close();
conn.disconnect();
}
} catch (IOException i) {
i.printStackTrace();
}catch (Exception e) {
e.printStackTrace();
如果服务器处于活动状态并且正常工作,则此代码对我有用,但是当我关闭服务器时,它会超时并"意外"崩溃。我想要的只是应用程序在无法访问服务器时说出或显示警报对话框。这是我的日志猫:
09-14 11:52:57.702: E/AndroidRuntime(17256): at android.os.Handler.dispatchMessage(Handler.java:99)
09-14 11:52:57.702: E/AndroidRuntime(17256): at android.os.Looper.loop(Looper.java:130)
09-14 11:52:57.702: E/AndroidRuntime(17256): at android.app.ActivityThread.main(ActivityThread.java:3693)
09-14 11:52:57.702: E/AndroidRuntime(17256): at java.lang.reflect.Method.invokeNative(Native Method)
09-14 11:52:57.702: E/AndroidRuntime(17256): at java.lang.reflect.Method.invoke(Method.java:507)
09-14 11:52:57.702: E/AndroidRuntime(17256): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
09-14 11:52:57.702: E/AndroidRuntime(17256): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
09-14 11:52:57.702: E/AndroidRuntime(17256): at dalvik.system.NativeStart.main(Native Method)
09-14 11:52:57.742: E/(179): Dumpstate > /data/log/dumpstate_app_error
请尝试以下操作
public String getData(String url) {
HttpClient httpclient = new DefaultHttpClient(SetHttpParams.setHttp(
50000, 50000));
HttpGet httpget = new HttpGet(url);
HttpResponse response;
try {
response = httpclient.execute(httpget);
if (response.getStatusLine().getStatusCode() == 200) {
org.apache.http.HttpEntity entity = response.getEntity();
if (entity != null) {
InputStream instream = entity.getContent();
String res = Functions.convertStreamToString(instream);
}
}
} catch (ConnectTimeoutException e) {
} catch (SocketTimeoutException e) {
} catch (IOException ex) {
}
}
字符串 res 是存储响应的字符串。在 Asyntasks doinBackground() 方法中调用上述函数。放置一些局部布尔变量来检查是否发生异常。并在 onPostExecute() 显示对话框是否发生异常或继续您的工作。希望对您有所帮助。