The android.os.NetworkOnMainThreadException exception

Android与Web Server交换数据 碰到异常The android.os.NetworkOnMainThreadException exception

原始代码

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        myBtn = (Button) this.findViewById(R.id.myBtn);
        myText = (TextView) this.findViewById(R.id.myText);

        myBtn.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {                        
                HttpClient client = new DefaultHttpClient();
                HttpGet request = new HttpGet("http://localhost:8080/data.jsp");
                HttpResponse response;
                try {
                    response = client.execute(request);
                    // Get the response
                    BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                    StringBuilder textView = new StringBuilder();

                    String line = "";
                    while ((line = rd.readLine()) != null) {
                        textView.append(line);
                    }
                    myText.setText(textView); //使用远程数据
                } catch (ClientProtocolException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });
    }

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

     <Button 
        android:id="@+id/myBtn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Click Me" />

     <TextView
        android:id="@+id/myText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Hello Rick!!!" />

</LinearLayout>

启动本地Tomcat,访问地址：http://localhost:8080/data.jsp
data.jsp

Hello Android!!!!

<%
    System.out.println("Request from client!!!");
%>

期望：点击按钮“Click Me”,TextView由 “Hello Rick!!!” —> “Hello Android!!!!”，万万没想到，抛出了异常！！！

Google到解决方案http://www.lucazanini.eu/en/2012/android/the-android-os-networkonmainthreadexception-exception/

加权限，同时加了代码。
改动如下：

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>

Activity.java

StrictMode.ThreadPolicy policy = new
                StrictMode.ThreadPolicy.Builder()
                .permitAll().build();
                StrictMode.setThreadPolicy(policy);

结果后台没有抛出异常，但是没有任何反应，这个纠结了很久。。。。
后来发现: http://localhost:8080/data.jsp，不能使用localhost和127.0.0.1
只能使用机器内网IP:192.168.1.106，然后成功了。
解决地址：http://stackoverflow.com/questions/5495534/java-net-connectexception-localhost-127-0-0-18080-connection-refused

测试结果