java根据IP获取用户所在地

import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.InputStreamReader;import java.net.HttpURLConnection;import java.net.URL;import org.json.JSONObject;public class AddressUtils {			/**	 * @param args	 */	public static void main(String[] args) {				AddressUtils addressUtils = new AddressUtils();				  String ip = "118.213.176.78";		  		  String address = "";		  		  try {			  		   address = addressUtils.getAddress("ip="+ip, "utf-8");		   		  } catch (Exception e) {			  			  e.printStackTrace();		  }		  		  System.out.println(address);		  	}	/**	 * 获取地址	 * @param params	 * @param encoding	 * @return	 * @throws Exception	 */	public String getAddress(String params, String encoding) throws Exception{				String path = "https://ip.taobao.com/service/getIpInfo.php";				String returnStr = this.getRs(path, params, encoding);				JSONObject json=null;				if(returnStr != null){						json = new JSONObject(returnStr);						if("0".equals(json.get("code").toString())){								StringBuffer buffer = new StringBuffer();								//buffer.append(decodeUnicode(json.optJSONObject("data").getString("country")));//国家								//buffer.append(decodeUnicode(json.optJSONObject("data").getString("area")));//地区								buffer.append(decodeUnicode(json.optJSONObject("data").getString("region")));//省份								buffer.append(decodeUnicode(json.optJSONObject("data").getString("city")));//市区								buffer.append(decodeUnicode(json.optJSONObject("data").getString("county")));//地区								buffer.append(decodeUnicode(json.optJSONObject("data").getString("isp")));//ISP公司								System.out.println(buffer.toString());								return buffer.toString();							}else{								return "获取地址失败�?";							}					}				return null;			}	/**	 * 从url获取结果	 * @param path	 * @param params	 * @param encoding	 * @return	 */	public String getRs(String path, String params, String encoding){				URL url = null;				HttpURLConnection connection = null;					try {						url = new URL(path);							connection = (HttpURLConnection)url.openConnection();// 新建连接实例							connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫�?						connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫�?						connection.setDoInput(true);// 是否打开输出�? true|false						connection.setDoOutput(true);// 是否打开输入流true|false						connection.setRequestMethod("POST");// 提交方法POST|GET						connection.setUseCaches(false);// 是否缓存true|false						connection.connect();// 打开连接端口						DataOutputStream out = new DataOutputStream(connection.getOutputStream());						out.writeBytes(params);						out.flush();						out.close();						BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),encoding));						StringBuffer buffer = new StringBuffer();						String line = "";						while ((line = reader.readLine())!= null) {								buffer.append(line);							}						reader.close();						return buffer.toString();					} catch (Exception e) {						e.printStackTrace();					}finally{						connection.disconnect();// 关闭连接					}				return null;	}	/**	 * 字符转码	 * @param theString	 * @return	 */	public static String decodeUnicode(String theString){				char aChar;				int len = theString.length();				StringBuffer buffer = new StringBuffer(len);				for (int i = 0; i < len;) {						aChar = theString.charAt(i++);						if(aChar == '\'){								aChar = theString.charAt(i++);							if(aChar == 'u'){										int val = 0;										for(int j = 0; j < 4; j++){												aChar = theString.charAt(i++);												switch (aChar) {												case '0':													case '1':													case '2':													case '3':													case '4':												case '5':													case '6':												case '7':													case '8':													case '9':													val = (val << 4) + aChar - '0';												break;							case 'a':													case 'b':													case 'c':													case 'd':													case 'e':													case 'f':													val = (val << 4) + 10 + aChar - 'a';						       						break;												case 'A':													case 'B':													case 'C':													case 'D':													case 'E':													case 'F':						  						val = (val << 4) + 10 + aChar - 'A';						       						break;						       						default:												throw new IllegalArgumentException(					         							"Malformed      encoding.");					    }											}										buffer.append((char) val);										}else{												if(aChar == 't'){														aChar = '\t';						}												if(aChar == 'r'){														aChar = '\r';						}												if(aChar == 'n'){														aChar = '\n';						}												if(aChar == 'f'){														aChar = '\f';													}												buffer.append(aChar);					}								}else{										buffer.append(aChar);									}							}				return buffer.toString();			}}import java.io.BufferedReader;import java.io