当我在浏览器中复制并粘贴HttpGet的getRequest对象的值时,它给出了正确的结果但是当我通过模拟器在Java中运行它时抛出异常。 如果对此有任何想法,请提前致谢。
public static String callWebService(String webMethod){
// HTTP get client
String serviceURL = "http://localhost:6158/Host/Service1.svc/";
serviceURL += webMethod;
HttpClient client=new DefaultHttpClient();
HttpGet getRequest=new HttpGet();
try {
// construct a URI object
getRequest.setURI(new URI(serviceURL));
} catch (URISyntaxException e) {
Log.e("URISyntaxException", e.toString());
}
// buffer reader to read the response
BufferedReader in=null;
// the service response
HttpResponse response=null;
try {
// execute the request
response = client.execute(getRequest);
} catch (ClientProtocolException e) {
Log.e("ClientProtocolException", e.toString());
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
try {
in=new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
} catch (IllegalStateException e) {
Log.e("IllegalStateException", e.toString());
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
StringBuffer buff=new StringBuffer("");
String line="";
try {
while((line=in.readLine())!=null)
{
buff.append(line);
}
} catch (IOException e) {
Log.e("IO exception", e.toString());
return e.getMessage();
}
try {
in.close();
} catch (IOException e) {
Log.e("IO exception", e.toString());
}
// response, need to be parsed
return buff.toString();
}
LogCat如下:
06-30 06:08:58.332:E / AndroidRuntime(851):致命异常:主要 06-30 06:08:58.332:E / AndroidRuntime(851):android.os.NetworkOnMainThreadException 06-30 06:08:58.332:E / AndroidRuntime(851):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1084) 06-30 06:08:58.332:E / AndroidRuntime(851):at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:74) 06-30 06:08:58.332:E / AndroidRuntime(851):at libcore.io.IoBridge.connectErrno(IoBridge.java:127) 06-30 06:08:58.332:E / AndroidRuntime(851):at libcore.io.IoBridge.connect(IoBridge.java:112) 06-30 06:08:58.332:E / AndroidRuntime(851):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 06-30 06:08:58.332:E / AndroidRuntime(851):at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 06-30 06:08:58.332:E / AndroidRuntime(851):at java.net.Socket.connect(Socket.java:842) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:119) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:144) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 06-30 06:08:58.332:E / AndroidRuntime(851):at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 06-30 06:08:58.332:E / AndroidRuntime(851):at com.rest.application.Globals.callWebService(Globals.java:49) 06-30 06:08:58.332:E / AndroidRuntime(851):at com.rest.application.RestAppActivity $ 1.onClick(RestAppActivity.java:39) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.view.View.performClick(View.java:3480) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.view.View $ PerformClick.run(View.java:13983) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.os.Handler.handleCallback(Handler.java:605) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.os.Handler.dispatchMessage(Handler.java:92) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.os.Looper.loop(Looper.java:137) 06-30 06:08:58.332:E / AndroidRuntime(851):在android.app.ActivityThread.main(ActivityThread.java:4340) 06-30 06:08:58.332:E / AndroidRuntime(851):at java.lang.reflect.Method.invokeNative(Native Method) 06-30 06:08:58.332:E / AndroidRuntime(851):at java.lang.reflect.Method.invoke(Method.java:511) 06-30 06:08:58.332:E / AndroidRuntime(851):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784) 06-30 06:08:58.332:E / AndroidRuntime(851):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-30 06:08:58.332:E / AndroidRuntime(851):at dalvik.system.NativeStart.main(Native Method) 06-30 06:18:02.316:E / Exception(938):android.os.NetworkOnMainThreadException 06-30 06:18:02.455:E / AndroidRuntime(938):致命异常:主要 06-30 06:18:02.455:E / AndroidRuntime(938):java.lang.NullPointerException 06-30 06:18:02.455:E / AndroidRuntime(938):at com.rest.application.Globals.callWebService(Globals.java:59) 06-30 06:18:02.455:E / AndroidRuntime(938):at com.rest.application.RestAppActivity $ 1.onClick(RestAppActivity.java:39) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.view.View.performClick(View.java:3480) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.view.View $ PerformClick.run(View.java:13983) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.os.Handler.handleCallback(Handler.java:605) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.os.Handler.dispatchMessage(Handler.java:92) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.os.Looper.loop(Looper.java:137) 06-30 06:18:02.455:E / AndroidRuntime(938):在android.app.ActivityThread.main(ActivityThread.java:4340) 06-30 06:18:02.455:E / AndroidRuntime(938):at java.lang.reflect.Method.invokeNative(Native Method) 06-30 06:18:02.455:E / AndroidRuntime(938):at java.lang.reflect.Method.invoke(Method.java:511) 06-30 06:18:02.455:E / AndroidRuntime(938):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:784) 06-30 06:18:02.455:E / AndroidRuntime(938):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-30 06:18:02.455:E / AndroidRuntime(938):at dalvik.system.NativeStart.main(Native Method)