任務是根據IP地質查詢所述的省份，可以運用第三方的工具。

網上搜了一下，採用了網上的現成程式碼並進行了修改：返回的引數封裝成了DTO，包含所屬國家、地區、省份、城市、網際網路服務提供商。

放到同一個pakage裡，執行Test.java或參照Test.java呼叫即可。

++++GetAddressByIp類+++++++++++++++++++++++++++++++++++++++++++++++

package main;


import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;


import net.sf.json.JSONObject;


/*
 * Author: Luo Tianyan
 * Version:20160505
 * 
 * 方法，用於根據IP地址找到所屬國家、地區、省份、城市、網際網路服務提供商
 * */
public class GetAddressByIp {


// 呼叫該類的getAddressByIp()方法即可
public static IpParserDTO getAddressByIp(String IP) {
IpParserDTO resultDto = new IpParserDTO();
try {
// 使用淘寶提供的service
String str = getJsonContent("http://ip.taobao.com/service/getIpInfo.php?ip="
+ IP);


// System.out.println(str);


JSONObject obj = JSONObject.fromObject(str);
JSONObject obj2 = (JSONObject) obj.get("data");
String code = String.valueOf(obj.get("code"));


if (code.equals("0")) {
resultDto.setCountry(obj2.get("country").toString());
resultDto.setArea(obj2.get("area").toString());
resultDto.setProvince(obj2.get("region").toString());
resultDto.setCity(obj2.get("city").toString());
resultDto.setServer(obj2.get("isp").toString());


} else {
System.out.println("IP地址有誤");
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("獲取IP地址異常：" + e.getMessage());
}
return resultDto;
}


public static String getJsonContent(String urlStr) {
try {
// 獲取HttpURLConnection連線物件
URL url = new URL(urlStr);
HttpURLConnection httpConn = (HttpURLConnection) url
.openConnection();
// 設定連線屬性
httpConn.setConnectTimeout(3000);
httpConn.setDoInput(true);
httpConn.setRequestMethod("GET");
// 獲取相應碼
int respCode = httpConn.getResponseCode();
if (respCode == 200) {
return convertStream2Json(httpConn.getInputStream());
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "";
}


private static String convertStream2Json(InputStream inputStream) {
String jsonStr = "";
// ByteArrayOutputStream相當於記憶體輸出流
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
// 將輸入流轉移到記憶體輸出流中
try {
while ((len = inputStream.read(buffer, 0, buffer.length)) != -1) {
out.write(buffer, 0, len);
}
// 將記憶體流轉換為字串
jsonStr = new String(out.toByteArray());
} catch (IOException e) {
e.printStackTrace();
}
return jsonStr;
}


}

++++++++IpParserDTO類+++++++++++++++++++++++++++++++++

package main;


import java.io.Serializable;


/*
 * Author: Luo Tianyan
 * Version:20160505
 * 
 * 用於ip解析的DTO
 * */
public class IpParserDTO implements Serializable {
private static final long serialVersionUID = 1L;
private String country;// 國家
private String area;// 地區，如“華南”
private String province;// 省份
private String city;// 城市
private String server;// 網際網路服務提供商，如“電信”


public String getCountry() {
return country;
}


public void setCountry(String country) {
this.country = country;
}


public String getArea() {
return area;
}


public void setArea(String area) {
this.area = area;
}


public String getProvince() {
return province;
}


public void setProvince(String province) {
this.province = province;
}


public String getCity() {
return city;
}


public void setCity(String city) {
this.city = city;
}


public String getServer() {
return server;
}


public void setServer(String server) {
this.server = server;
}


public static long getSerialversionuid() {
return serialVersionUID;
}


@Override
public String toString() {
return "IpParserDTO [country=" + country + ", area=" + area
+ ", province=" + province + ", city=" + city + ", server="
+ server + "]";
}
}

+++++++++++Test類+++++++++++++++++++++++++++++++

package main;


import main.IpParserDTO;


/*
 * Author: Luo Tianyan
 * Version:20160505
 * 
 * 方法，測試用
 * */
public class Test {
public static void main(String[] args) {
// 呼叫GetAddressByIp類的getAddressByIp()方法即可，引數為String的IP地址，返回IpParserDTO物件
IpParserDTO test1 = GetAddressByIp.getAddressByIp("221.238.6.1");


// IpParserDTO物件的屬性：國家country、地區area、省份province、城市city、網際網路服務提供商server
// 均有各自的getter和setter
System.out.println(test1.getProvince());
}
}

++++++++++++++++++++++