調用IP接口

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLDecoder;
import java.nio.charset.Charset;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class ceshi {
	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException{
		
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("E:\\ip.txt"), "utf-8")); //
		
		File file = new File("E:\\result.txt");
		if(!file.exists()){
			file.createNewFile();
		}
		BufferedWriter bw = new BufferedWriter(new FileWriter(file)); 
		String country = "\"country\":\"(.*)\"";//匹配國家
		String area = "\"area\":\"(.*)\"";//匹配省份
		String city = "\"city\":\"(.*)\"";//匹配城市
		String line = null;
		String countryStr;
		String areaStr;
		String cityStr;
		while ((line = br.readLine()) != null) {
			if(!line.trim().equals("")){
				line = get(line.trim());
				countryStr = getValue(line, country);
				areaStr = getValue(line, area);
				cityStr = getValue(line, city);
				bw.append(countryStr + " " + areaStr + " " + cityStr);
			}
		}
		br.close();
		bw.close();
		
		System.out.println("end");
		
	}
	
	public static String convert(String utfString){  
		   StringBuilder sb = new StringBuilder();  
		   int i = -1;  
		   int pos = 0;  
		     
		   while((i=utfString.indexOf("\\u", pos)) != -1){  
		       sb.append(utfString.substring(pos, i));  
		       if(i+5 < utfString.length()){  
		           pos = i+6;  
		           sb.append((char)Integer.parseInt(utfString.substring(i+2, i+6), 16));  
		       }  
		   }  
		     
		   return sb.toString();  
		} 
	
	public static String getValue(String line, String patternStr) throws UnsupportedEncodingException{
		Pattern pattern = Pattern.compile(patternStr);
		Matcher matcher = pattern.matcher(new String(line));
		String value = "";
		if(matcher.find()){
			value = matcher.group(0);
			value = value.split(":")[1];
			value = value.split(",")[0];
			value = value.substring(1, value.length()-1);
		}
		return value;
	}
	
	public static String get(String ip) throws IOException{
		String urlNameString = "http://ip.taobao.com/service/getIpInfo.php?ip=" + ip;
        URL realUrl = new URL(urlNameString);
		URLConnection connection = realUrl.openConnection();

        connection.setRequestProperty("accept", "*/*");
        connection.setRequestProperty("connection", "Keep-Alive");
        connection.setRequestProperty("user-agent",
                "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

        connection.connect();
     
        BufferedReader in = new BufferedReader(new InputStreamReader(
                connection.getInputStream(), Charset.forName("utf-8")));
        String line;
        String result = "";
        while ((line = in.readLine()) != null) {
            result += line;
        }
        return convert(result);
	}
}