在调用百度API实现“将地址解析为对应经纬度”时提示一下异常，求解决方案
java.net.UnknownHostException: api.map.baidu.com
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at change.LatitudeUtils.getGeocoderLatitude(LatitudeUtils.java:27)
at change.LatitudeUtils.main(LatitudeUtils.java:62)
java.lang.NullPointerException
at change.LatitudeUtils.getGeocoderLatitude(LatitudeUtils.java:52)
at change.LatitudeUtils.main(LatitudeUtils.java:62)
