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我收到此警告：

    06-26 15:19:09.689: W/System.err(611): org.apache.http.conn.HttpHostConnectException: Connection to http://localhost:8080 refused
06-26 15:19:09.689: W/System.err(611):  at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:183)
06-26 15:19:09.719: W/System.err(611):  at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
06-26 15:19:09.719: W/System.err(611):  at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
06-26 15:19:09.719: W/System.err(611):  at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
06-26 15:19:09.739: W/System.err(611):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
06-26 15:19:09.739: W/System.err(611):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
06-26 15:19:09.739: W/System.err(611):  at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)

在尝试在非 ui 类中执行此代码时：

1    public String getXmlFromUrl(String url) { 
2            String xml = null; 
3            try { 
4                HttpClient httpClient = new DefaultHttpClient();
5                HttpPost httpPost = new HttpPost(url); 
6                HttpResponse httpResponse = httpClient.execute(httpPost); 
7                HttpEntity httpEntity = httpResponse.getEntity(); 
8                xml = EntityUtils.toString(httpEntity); 
9            } catch (UnsupportedEncodingException e) { 
10                e.printStackTrace(); 
11            } catch (ClientProtocolException e) { 
12               e.printStackTrace(); 
13            } catch (IOException e) { 
14                e.printStackTrace(); 
15            } 
16            return xml; 
17        }

我提供网址为

http://10.0.2.2:8080/Mysite/xxx

这里有什么问题。为什么我会收到这个错误。

因此，“xml”字符串返回 null，这进一步导致我的应用程序出错。

我调试了我的应用程序，我可以看到我捕获了一个异常 IOException，因此我将从第 6 行转到第 13 行。

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