用HttpURLConnection請求百度首頁成功，(GET請求)請求這個地址也成功：http://10.207.112.191:8080，說明后臺服務器可用但請求這個地址不成功：http://10.207.112.191:8080/user/user后臺測試代碼：用的是SpringMVC@RequestMapping(value = "/user", method = RequestMethod.GET) ? ? ?public void Reply(HttpServletResponse response) throws IOException { ? ? ? ? ?PrintWriter out = response.getWriter(); ? ? ? ?System.out.println("來自安卓"); ? ? ? ?out.print("OK"); ? ? ? ?out.flush(); ? ? ? ? ? ? ?out.close(); ? ?}logcat:D/NetworkSecurityConfig: No Network Security Config specified, using platform defaultD/Tag: 未進入httpW/System.err: java.io.FileNotFoundException: http://10.207.112.191:8080/userW/System.err: ? ? at com.android.okhttp.internal.huc.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:250)W/System.err: ? ? at hope.HttpUtil.HttpUtil$1.run(HttpUtil.java:43)W/System.err: ? ? at java.lang.Thread.run(Thread.java:761)