java - Android Emulator 使用 HttpGet 通过代理访问 RESTful Web 服务

Question

我正在尝试通过我电脑上的 Android 模拟器访问 RESTful 网络服务，它使用代理连接到互联网。

我的代码可以正常访问实际 Android 设备上的 Web 服务，该设备具有自己的数据连接，代码如下:

    DefaultHttpClient client = new DefaultHttpClient();
    client.getParams().setParameter(ClientPNames.ALLOW_CIRCULAR_REDIRECTS, true);

    HttpGet request = new HttpGet("http://mytesturl.com/services/serviceName");
    UsernamePasswordCredentials creds = 
        new UsernamePasswordCredentials("username", "password");
    request.addHeader(BasicScheme.authenticate(creds, "UTF-8", false));

    HttpResponse response = client.execute(request);

我尝试了多种方法来尝试让模拟器允许通过代理进行连接，但都没有奏效。

请注意，我确实在 AndroidManifest.xml 中启用了互联网:

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

尝试 1 - 设置属性:

这会在 execute() 调用时为我的服务的 URL 产生一个 UnknownHostException

Properties props = System.getProperties();
props.put("http.proxyHost", "httpproxy.mycompany.com");
props.put("http.proxyPort", "80");

尝试 2 - 在 DefaultHttpClient 中设置代理:

这会为实际代理产生一个 UnknownHostException

DefaultHttpClient client = new DefaultHttpClient();
client.getParams().setParameter(ClientPNames.ALLOW_CIRCULAR_REDIRECTS, true);

HttpHost proxy = new HttpHost("httpproxy.mycompany.com", 80);
client.getCredentialsProvider().setCredentials(
        new AuthScope("httpproxy.mycompany.com", 80),
        new UsernamePasswordCredentials("username", "password"));
client.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

HttpGet request = new HttpGet("http://mytesturl.com/services/serviceName");
UsernamePasswordCredentials cred = 
    new UsernamePasswordCredentials("username", "password");
request.addHeader(BasicScheme.authenticate(cred, "UTF-8", false));
HttpResponse response = client.execute(request);

尝试 3 - 在 HttpGet 中设置代理

这会为我的 HttpGet 中的 URL 产生一个 UnknownHostException

DefaultHttpClient client = new DefaultHttpClient();
client.getParams().setParameter(ClientPNames.ALLOW_CIRCULAR_REDIRECTS, true);

HttpGet request = new HttpGet("http://mytesturl.com/services/serviceName");
UsernamePasswordCredentials cred = 
    new UsernamePasswordCredentials("username", "password");
request.addHeader(BasicScheme.authenticate(cred, "UTF-8", false));
Header bs = new BasicScheme().authenticate(
        new UsernamePasswordCredentials("username", "password"),
        request);
request.addHeader("Proxy-Authorization", bs.getValue());
HttpResponse response = client.execute(request);

我不确定还能尝试什么。我愿意接受任何建议。

Answer 1

遇到同样的问题，我在尝试 3(下面的代码)的变体中成功了，关键的区别在于 setProperty 语句。请注意，我调用的 Web 服务不需要身份验证，因此我只设置代理授权 header 。

System.setProperty("java.net.useSystemProxies", "false");
System.setProperty("http.proxyHost", "123.56.7.9");
System.setProperty("http.proxyPort", "8080"); 

DefaultHttpClient client = new DefaultHttpClient();
client.getParams().setParameter(ClientPNames.ALLOW_CIRCULAR_REDIRECTS, true);

HttpGet request = new HttpGet("web service url");
Header bs = new BasicScheme().authenticate(
    new UsernamePasswordCredentials("NETWORKID", "netpassword"),
    request);
request.addHeader("Proxy-Authorization", bs.getValue());
HttpResponse response = client.execute(request);