android 从tomcat读取文件出错：connect failed: ECONNREFUSED

android 从tomcat读取文件时出现以下异常：

08-10 14:53:09.118: W/System.err(12527): java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 8080): connect failed:
ECONNREFUSED (Connection refused)

08-10 14:53:09.118: W/System.err(12527): at libcore.io.IoBridge.connect(IoBridge.java:114)

08-10 14:53:09.128: W/System.err(12527): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)

08-10 14:53:09.128: W/System.err(12527): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)

08-10 14:53:09.128: W/System.err(12527): at java.net.Socket.connect(Socket.java:842)

08-10 14:53:09.158: W/System.err(12527): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)

08-10 14:53:09.158: W/System.err(12527): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)

08-10 14:53:09.158: W/System.err(12527): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)

08-10 14:53:09.168: W/System.err(12527): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)

08-10 14:53:09.168: W/System.err(12527): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)

08-10 14:53:09.178: W/System.err(12527): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)

08-10 14:53:09.178: W/System.err(12527): at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)

08-10 14:53:09.178: W/System.err(12527): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)

08-10 14:53:09.178: W/System.err(12527): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)

08-10 14:53:09.208: W/System.err(12527): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:282)

08-10 14:53:09.208: W/System.err(12527): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)

08-10 14:53:09.208: W/System.err(12527): at com.example.androidstudy.utils.HttpFileDownloadUtils.download(HttpFileDownloadUtils.java:31)

08-10 14:53:09.218: W/System.err(12527): at com.example.androidstudy.FileDownloadActivity$1$1.handleMessage(FileDownloadActivity.java:36)

08-10 14:53:09.218: W/System.err(12527): at android.os.Handler.dispatchMessage(Handler.java:95)

08-10 14:53:09.232: W/System.err(12527): at android.os.Looper.loop(Looper.java:137)

08-10 14:53:09.232: W/System.err(12527): at android.os.HandlerThread.run(HandlerThread.java:60)

08-10 14:53:09.238: W/System.err(12527): Caused by: libcore.io.ErrnoException: connect failed: ECONNREFUSED (Connection refused)

08-10 14:53:09.251: W/System.err(12527): at libcore.io.Posix.connect(Native Method)

08-10 14:53:09.251: W/System.err(12527): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:85)

08-10 14:53:09.251: W/System.err(12527): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)

08-10 14:53:09.258: W/System.err(12527): at libcore.io.IoBridge.connect(IoBridge.java:112)

08-10 14:53:09.258: W/System.err(12527): ... 19 more

解决方法：

String url = "http://localhost:8080/notice/test.txt";
修改成 String url = "http://192.168.1.100:8080/notice/test.txt";

主机ip不能使用localhost或者127.0.0.1，使用真实ip地址即可。