Java根據IP獲取城市

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * 根據IP地址獲取詳細的地域信息
 * 淘寶API : http://ip.taobao.com/service/getIpInfo.php?ip=218.192.3.42
 * 新浪API : http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip=218.192.3.42
 * @File AddressUtils.java
 * @Package org.gditc.weicommunity.util
 * @Description TODO
 * @Copyright Copyright © 2014
 * @Site https://github.com/Cryhelyxx
 * @Blog http://blog.csdn.net/Cryhelyxx
 * @Email cryhelyxx@gmail.com
 * @Company GDITC
 * @Date 2014年11月6日 下午1:46:37
 * @author Cryhelyxx
 * @version 1.0
 */
public class AddressUtils {
    /**
     *
     * @param content
     *            請求的參數 格式爲：name=xxx&pwd=xxx
     *            服務器端請求編碼。如GBK,UTF-8等
     * @return
     * @throws UnsupportedEncodingException
     */
    public String getAddresses(String content, String encodingString, String ip)
            throws UnsupportedEncodingException {
        // 這裏調用pconline的接口
        String urlStr = "http://ip.taobao.com/service/getIpInfo.php?ip=" + ip;
        // 從http://whois.pconline.com.cn取得IP所在的省市區信息
        String returnStr = this.getResult(urlStr, content, encodingString);
        if (returnStr != null) {
            // 處理返回的省市區信息
            String[] temp = returnStr.split(",");
            if(temp.length<3){
                return "0";//無效IP，局域網測試
            }
            String region = (temp[5].split(":"))[1].replaceAll("\"", "");
            region = decodeUnicode(region);// 省份
            return region;
        }
        return null;
    }
    /**
     * @param urlStr
     *            請求的地址
     * @param content
     *            請求的參數 格式爲：name=xxx&pwd=xxx
     * @param encoding
     *            服務器端請求編碼。如GBK,UTF-8等
     * @return
     */
    private String getResult(String urlStr, String content, String encoding) {
        URL url = null;
        HttpURLConnection connection = null;
        try {
            url = new URL(urlStr);
            connection = (HttpURLConnection) url.openConnection();// 新建鏈接實例
            connection.setConnectTimeout(2000);// 設置鏈接超時時間，單位毫秒
            connection.setReadTimeout(2000);// 設置讀取數據超時時間，單位毫秒
            connection.setDoOutput(true);// 是否打開輸出流 true|false
            connection.setDoInput(true);// 是否打開輸入流true|false
            connection.setRequestMethod("POST");// 提交方法POST|GET
            connection.setUseCaches(false);// 是否緩存true|false
            connection.connect();// 打開鏈接端口
            DataOutputStream out = new DataOutputStream(connection
                    .getOutputStream());// 打開輸出流往對端服務器寫數據
            out.writeBytes(content);// 寫數據,也就是提交你的表單 name=xxx&pwd=xxx
            out.flush();// 刷新
            out.close();// 關閉輸出流
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    connection.getInputStream(), encoding));// 往對端寫完數據對端服務器返回數據
            // ,以BufferedReader流來讀取
            StringBuffer buffer = new StringBuffer();
            String line = "";
            while ((line = reader.readLine()) != null) {
                buffer.append(line);
            }
            reader.close();
            return buffer.toString();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();// 關閉鏈接
            }
        }
        return null;
    }
    /**
     * unicode 轉換成 中文
     *
     * @author fanhui 2007-3-15
     * @param theString
     * @return
     */
    public static String decodeUnicode(String theString) {
        char aChar;
        int len = theString.length();
        StringBuffer outBuffer = new StringBuffer(len);
        for (int x = 0; x < len;) {
            aChar = theString.charAt(x++);
            if (aChar == '\\') {
                aChar = theString.charAt(x++);
                if (aChar == 'u') {
                    int value = 0;
                    for (int i = 0; i < 4; i++) {
                        aChar = theString.charAt(x++);
                        switch (aChar) {
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                value = (value << 4) + aChar - '0';
                                break;
                            case 'a':
                            case 'b':
                            case 'c':
                            case 'd':
                            case 'e':
                            case 'f':
                                value = (value << 4) + 10 + aChar - 'a';
                                break;
                            case 'A':
                            case 'B':
                            case 'C':
                            case 'D':
                            case 'E':
                            case 'F':
                                value = (value << 4) + 10 + aChar - 'A';
                                break;
                            default:
                                throw new IllegalArgumentException(
                                        "Malformed      encoding.");
                        }
                    }
                    outBuffer.append((char) value);
                } else {
                    if (aChar == 't') {
                        aChar = '\t';
                    } else if (aChar == 'r') {
                        aChar = '\r';
                    } else if (aChar == 'n') {
                        aChar = '\n';
                    } else if (aChar == 'f') {
                        aChar = '\f';
                    }
                    outBuffer.append(aChar);
                }
            } else {
                outBuffer.append(aChar);
            }
        }
        return outBuffer.toString();
    }
    // 直接調用此方法
    public static String getCity(String publicIp) {
        AddressUtils addressUtils = new AddressUtils();
        String ip = "122.49.20.247";
        String address = "";
        try {
            address = addressUtils.getAddresses("ip="+ip, "utf-8", publicIp);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return address;
    }
}