java 根据IP地址获取详细的地域信息(百度API)

直接上代码

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;
 
/**
 * 根据IP地址获取详细的地域信息
 * 百度API : http://api.map.baidu.com/location/ip?ip=218.192.3.42&ak=4NsiohuFbm02dUR8sLxPdLUXsjVy5DwG&coor=bd09ll
 */
public class AddressUtils {
     
	/**
	 * 
	 * @param content
	 *            请求的参数 格式为：ip=xxx&ak=xxx
	 * @param encoding
	 *            服务器端请求编码。如GBK,UTF-8等
	 * @return
	 * @throws UnsupportedEncodingException
	 */
	public static String getAddresses(String content, String encodingString)
			throws UnsupportedEncodingException {
     
		// 这里调用百度API
		String urlStr = "http://api.map.baidu.com/location/ip";
		String returnStr = getResult(urlStr, content, encodingString);
		if (returnStr != null) {
     
			// 处理返回的省市区信息
//			System.out.println("(1) unicode转换成中文前的returnStr : " + returnStr);
			returnStr = decodeUnicode(returnStr);
//			System.out.println("(2) unicode转换成中文后的returnStr : " + returnStr);
			String[] temp = returnStr.split(",");
			if(temp.length<3){
     
				return "0";//无效IP，局域网测试
			}
			return returnStr;
		}
		return null;
	}
	/**
	 * @param urlStr
	 *            请求的地址
	 * @param content
	 *            请求的参数 格式为：name=xxx&pwd=xxx
	 * @param encoding
	 *            服务器端请求编码。如GBK,UTF-8等
	 * @return
	 */
	private static String getResult(String urlStr, String content, String encoding) {
     
		URL url = null;
		HttpURLConnection connection = null;
		try {
     
			url = new URL(urlStr);
			connection = (HttpURLConnection) url.openConnection();// 新建连接实例
			connection.setConnectTimeout(2000);// 设置连接超时时间，单位毫秒
			connection.setReadTimeout(2000);// 设置读取数据超时时间，单位毫秒
			connection.setDoOutput(true);// 是否打开输出流 true|false
			connection.setDoInput(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());// 打开输出流往对端服务器写数据
			out.writeBytes(content);// 写数据,也就是提交你的表单 ip=xxx&ak=xxx
			out.flush();// 刷新
			out.close();// 关闭输出流
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					connection.getInputStream(), encoding));// 往对端写完数据对端服务器返回数据
			// ,以BufferedReader流来读取
			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();// 关闭连接
			}
		}
		return null;
	}
	/**
	 * unicode 转换成 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();
	}
	// 测试
	public static void main(String[] args) {
     
		AddressUtils addressUtils = new AddressUtils();
		// 测试ip 122.49.20.247 中国=北京=北京=联通
		String content="ip=122.49.20.247&ak=4NsiohuFbm02dUR8sLxPdLUXsjVy5DwG&coor=bd09ll";
		String encodingString="UTF-8";
		String address = "";
		try {
     
			address = addressUtils.getAddresses(content, encodingString);
		} catch (UnsupportedEncodingException e) {
     
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(address);
		// 输出结果为：北京,北京,XX
	}
}