Android 上的 Restlet 客户端:无法启动:(
我一直在玩 Restlet,到目前为止我很喜欢它:)
不过,我在让 Restlet 客户端在 Android 模拟器上工作时遇到了一些麻烦。
现在有一个非常简单的 Restlet 服务器在 JSE 下运行。它所做的只是通过 GET 方法公开根资源(目前只是一行文本)。我可以使用浏览器以及在控制台中运行的简单 Restlet 客户端来使用资源。我已经修改了 JSE 客户端的代码以尝试从 Android 模拟器连接,但无法使其工作:
package mypackage;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import org.restlet.resource.ClientResource;
import org.restlet.representation.Representation;
public class MyActivity extends Activity {
@Override
public void onCreate( Bundle savedInstanceState ) {
super.onCreate( savedInstanceState );
ClientResource res = new ClientResource( "http://server-ip:8111/" );
Representation rep = res.get();
TextView tv = new TextView( this );
try {
tv.setText( rep.getText() );
} catch ( Exception ex ) {
tv.setText( "Exception: " + ex.getMessage() );
}
setContentView( tv );
}
}
注意:
(1) Android 模拟器上的内置浏览器可以连接到 Web 服务并检索文本。
(2) 项目Manifest.xml文件已被修改以启用使用权限INTERNET。
(3) 以下使用与 android 捆绑在一起的 Apache HttpClient 库的客户端工作得很好:
package mypackage;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DefaultHttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet( "http://server-ip:8111/" );
ResponseHandler<String> handler = new BasicResponseHandler();
TextView tv = new TextView( this );
try {
String content = client.execute( get, handler );
client.getConnectionManager().shutdown();
setContentView( tv );
tv.setText( content );
} catch ( Exception ex ) {
tv.setText( "Exception: " + ex.getMessage() );
}
}
}
有什么想法我可能做错了吗?
预先感谢,
迈克。
I've been playing around a bit with restlet, and so far I like it :)
I am having some trouble getting a restlet client to work on an android emulator, though.
Right now a have a very simple restlet server running under JSE. All it does is expose a root resource (which for the moment is just a line of text) via the GET method. I can get consume the resource with a browser, and also with a simple restlet client running in the console. I have modified the code for the JSE client to try to connect from an android emulator but I can't get it to work:
package mypackage;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import org.restlet.resource.ClientResource;
import org.restlet.representation.Representation;
public class MyActivity extends Activity {
@Override
public void onCreate( Bundle savedInstanceState ) {
super.onCreate( savedInstanceState );
ClientResource res = new ClientResource( "http://server-ip:8111/" );
Representation rep = res.get();
TextView tv = new TextView( this );
try {
tv.setText( rep.getText() );
} catch ( Exception ex ) {
tv.setText( "Exception: " + ex.getMessage() );
}
setContentView( tv );
}
}
Notes:
(1) The built-in browser on the android emulator can connect to the web service and retrieve the text.
(2) The project Manifest.xml file has been modified to enable the uses-permission INTERNET.
(3) The following client using the Apache HttpClient library that comes bundled with android works just fine:
package mypackage;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
public class TestActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
DefaultHttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet( "http://server-ip:8111/" );
ResponseHandler<String> handler = new BasicResponseHandler();
TextView tv = new TextView( this );
try {
String content = client.execute( get, handler );
client.getConnectionManager().shutdown();
setContentView( tv );
tv.setText( content );
} catch ( Exception ex ) {
tv.setText( "Exception: " + ex.getMessage() );
}
}
}
Any ideas what I might be doing wrong?
Thanks in advance,
Mike.
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一种解决方法是手动注册 org.restlet.ext.httpclient 扩展以替换内部/默认 HTTP 客户端。请参阅 Restlet 用户指南:
http://wiki.restlet.org/docs_2 .1/13-restlet/275-restlet/266-restlet.html
最近的 Restlet 2.1 快照还修复了内部 HTTP 连接器长期存在的问题,该问题可能导致意外超时。
One workaround is to register the org.restlet.ext.httpclient extension manually to replace the internal/default HTTP client. See Restlet user guide:
http://wiki.restlet.org/docs_2.1/13-restlet/275-restlet/266-restlet.html
Recent Restlet 2.1 snapshots have also fixed a long standing issue with the internal HTTP connector that could cause unexpected timeouts.