求高人帮助看一下这个类型的报错如何修改？

高手，您好：
小弟的代码如下：

package n_port_package_MyGodWillMyIdeal;



import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;



import net.sf.json.JSONObject;



public class AddressUtils {

	static String country = "";

	static String area = "";

	static String region = "";

	static String city = "";

	static String enterprise = "";

	static String ISP = "";



	/**

	 * @param args

	 */

	public static void main(String[] args) {



		AddressUtils addressUtils = new AddressUtils();



		String ip = "222.75.255.81";



		String address = "";



		try {



			address = addressUtils.getAddress("ip=" + ip, "utf-8");



		} catch (Exception e) {

			e.printStackTrace();

			

		}



		// //////////System.out.println(address);

		// //////////System.out.println("region-------->>"+region);

		// //////////System.out.println("city---------->>"+city);

		// //////////System.out.println("country---------->>"+country);

		// //////////System.out.println("ISP---------->>"+ISP);



	}



	/**

	 * 获取地址

	 * 

	 * @param params

	 * @param encoding

	 * @return

	 * @throws Exception

	 */

	public String getAddress(String params, String encoding) throws Exception {



		String path = "http://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

				region = decodeUnicode(json.optJSONObject("data").getString(

						"region"));

				buffer.append(decodeUnicode(json.optJSONObject("data")

						.getString("city")));// 市区

				city = decodeUnicode(json.optJSONObject("data").getString(

						"city"));

				buffer.append(decodeUnicode(json.optJSONObject("data")

						.getString("county")));// 地区

				country = decodeUnicode(json.optJSONObject("data").getString(

						"county"));

				buffer.append(decodeUnicode(json.optJSONObject("data")

						.getString("isp")));// ISP公司

				ISP = decodeUnicode(json.optJSONObject("data").getString("isp"));

				// //////////System.out.println(buffer.toString());

				return buffer.toString();



			} else {



				return "用户地址获取暂不成功";



			}



		}



		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();



	}



}

高手，小弟的上面的这个类型的报错在这个位置：

求高人点拨：
小弟的上述类型，这个小弟从网上Dwon下来的工具类，要怎么修改，才能够将图片中的报错改掉？
谢谢高人的过目！！