Android客户端未连接到REST服务器
[英]Android client not connecting to REST server
问题描述
I have a Spring Restful Server functional. 
我有一个Spring Restful Server功能。 It accepts requests from any browser and from a Java client that I made to test it. 它接受来自任何浏览器和我测试它的Java客户端的请求。
The problem is when I try to connect to it with Android, whether it is on the emulator or on a smartphone. 问题是当我尝试通过Android连接到它时，无论它是在模拟器上还是在智能手机上。
I have this simple code in my Java client to test the server: 我的Java客户端中有以下简单代码来测试服务器：
public void requestServer() throws IOException {
String url = "http://localhost:8080/checkPoints?username=john";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
}
It works perfectly. 它运作完美。 If I debug it I see that con has the HTTP response code 200, and the response from the page is exactly the number of points that john has. 如果我对其进行调试，我会看到con的HTTP响应代码为200，而页面中的响应正是john所拥有的点数。
But if I try it on Android with the same code to be activated when a button is clicked: 但是，如果我在Android上尝试使用单击按钮时要激活的相同代码进行尝试：
public void requestServer(View view) throws IOException {
String url = "http://10.0.2.2:8080/checkPoints?username=joao";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
//print result
System.out.println(response.toString());
}
It always breaks out in this line: 它总是在这一行中出现：
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
If I debug it, I see that the HTTP response code is -1, instead of 200. I've tried my internal network IP (192.168.1.79 in my case), and it does not work. 如果我对其进行调试，则会看到HTTP响应代码是-1，而不是200。我已经尝试了内部网络IP（在我的情况下为192.168.1.79），但它不起作用。 I've searched in a lot of threads here in Stackoverflow and tried a lot of code that users had, and in all those pieces of code, it always breaks out in the same code, which is that obj.openConnection(). 我在Stackoverflow中搜索了很多线程，并尝试了许多用户拥有的代码，在所有这些代码中，它总是在同一代码中出现，即obj.openConnection（）。
I have the permission for Internet in the manifest, it won't be because of that. 我已在清单中获得了Internet的许可，这不是因为这个。
What could it be? 会是什么呢？
Edit: Here is the stackTrace 编辑：这是stackTrace
5-02 19:19:38.109 2769-2769/pt.androidrestfulclient E/AndroidRuntime: FATAL EXCEPTION: main
Process: pt.androidrestfulclient, PID: 2769
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:289)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456)
at java.net.Socket.connect(Socket.java:882)
at com.android.okhttp.internal.Platform.connectSocket(Platform.java:174)
at com.android.okhttp.Connection.connect(Connection.java:152)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:382)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:332)
at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:500)
at pt.ulisboa.tecnico.cmov.androidrestfulclient.MainActivity.requestServer(MainActivity.java:50)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
1 个解决方案
解决方案1
0 已采纳 2016-05-02 18:27:25
Try wrapping requestServer() with an Asynctask. 尝试使用Asynctask包装requestServer() 。 Execute this method in doInBackground() 在doInBackground（）中执行此方法
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