我正在尝试在android中创建一个简单的多线程服务器，我正在使用的代码不会给我任何错误，但是警告请看一下我的代码，并告诉我如果我将其作为Java运行，则我的代码可以正常工作的错误应用程序代码如下：
package dolphin.developers.com;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import android.app.Activity;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;
public class AnroidWebServerActivity extends Activity {
ServerSocket serverSocket;
{
try {
runserver();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void runserver() throws Exception {
serverSocket = new ServerSocket(8080);
acceptRequest();
}
private void acceptRequest() throws Exception{
while(true){
Socket s = serverSocket.accept();
Log.v("tag", "server is ruunning!!");
ConnectionHandler ch = new ConnectionHandler(s);
ch.start();
}
}
public class ConnectionHandler extends Thread {
PrintWriter pw;
BufferedReader br;
Socket s;
public ConnectionHandler(Socket s) throws Exception{
this.s = s;
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
pw = new PrintWriter(s.getOutputStream());
}
@Override
public void run() {
Looper.loop();
try{
String reqS = "";
while (br.ready() || reqS.length() == 0){
reqS += (char) br.read();
}
System.out.println(reqS);
HttpRequest req = new HttpRequest(reqS);
HttpResponse res = new HttpResponse(req);
pw.write(res.response.toCharArray());
pw.close();
br.close();
s.close();
}
catch (Exception e) {
e.printStackTrace();
}
}
}
public class HttpRequest{
public String filename ;
public HttpRequest(String request){
String lines[] = request.split("\n");
lines = lines[0].split(" ");
filename = lines[1];
}
}
public class HttpResponse{
HttpRequest req;
String root;
String response;
public HttpResponse(HttpRequest request){
req=request;
root = Environment.getExternalStorageDirectory() + "/";
File f = new File(root + req.filename);
try{
response+= "HTTP/1.1 200 \r\n";
response+= "Apache Server /1.0";
response+= "Content-Type: text/html \r\n";
response+="Connection: close \r\n";
response+= "Content-Length:" + f.length() + "\r\n";
response+= "\r\n";
FileInputStream fis = new FileInputStream(f);
int s;
while ((s = fis.read()) != -1){
response += (char)s ;
}
fis.close();
}catch(FileNotFoundException fg){
response = response.replace("200", "404");
}
catch(IOException e ){
response = response.replace("200", "500");
e.printStackTrace();
}
}
}
}
Logcat：
07-18 14:34:23.367: W/System.err(1249): android.os.NetworkOnMainThreadException
07-18 14:34:23.388: W/System.err(1249): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
07-18 14:34:23.398: W/System.err(1249): at libcore.io.BlockGuardOs.accept(BlockGuardOs.java:54)
07-18 14:34:23.398: W/System.err(1249): at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:98)
07-18 14:34:23.398: W/System.err(1249): at java.net.ServerSocket.implAccept(ServerSocket.java:202)
07-18 14:34:23.398: W/System.err(1249): at java.net.ServerSocket.accept(ServerSocket.java:127)
07-18 14:34:23.407: W/System.err(1249): at dolphin.developers.com.AnroidWebServerActivity.acceptRequest(AnroidWebServerActivity.java:47)
07-18 14:34:23.407: W/System.err(1249): at dolphin.developers.com.AnroidWebServerActivity.runserver(AnroidWebServerActivity.java:40)
07-18 14:34:23.407: W/System.err(1249): at dolphin.developers.com.AnroidWebServerActivity.<init>(AnroidWebServerActivity.java:30)
07-18 14:34:23.407: W/System.err(1249): at java.lang.Class.newInstanceImpl(Native Method)
07-18 14:34:23.407: W/System.err(1249): at java.lang.Class.newInstance(Class.java:1319)
07-18 14:34:23.407: W/System.err(1249): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
07-18 14:34:23.407: W/System.err(1249): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
07-18 14:34:23.407: W/System.err(1249): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-18 14:34:23.407: W/System.err(1249): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-18 14:34:23.407: W/System.err(1249): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-18 14:34:23.427: W/System.err(1249): at android.os.Handler.dispatchMessage(Handler.java:99)
07-18 14:34:23.447: W/System.err(1249): at android.os.Looper.loop(Looper.java:137)
07-18 14:34:23.447: W/System.err(1249): at android.app.ActivityThread.main(ActivityThread.java:5039)
07-18 14:34:23.447: W/System.err(1249): at java.lang.reflect.Method.invokeNative(Native Method)
07-18 14:34:23.447: W/System.err(1249): at java.lang.reflect.Method.invoke(Method.java:511)
07-18 14:34:23.447: W/System.err(1249): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-18 14:34:23.447: W/System.err(1249): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-18 14:34:23.447: W/System.err(1249): at dalvik.system.NativeStart.main(Native Method)
看来您正在尝试直接从Activity的主线程运行服务器。这将阻止您的应用程序运行，并最终导致其崩溃。您需要在后台线程上运行服务器。
正确的方法是将服务器线程移动到服务中，您可以在此处了解更多信息：http : //developer.android.com/training/run-background-service/index.html。本文将为您提供其他一些直接在您的Activity中使用线程的选项：http : //www.vogella.com/articles/AndroidBackgroundProcessing/article.html。
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