java调用高德地图api实现通过ip定位访问者的城市

所需东西：高德地图的key　　注意：这个key是 web服务的key 和js的key不是一个key（若没有则自行创建，创建教程在文末）

高德地图的api文档：https://lbs.amap.com/api/webservice/guide/api/ipconfig/

新建工具类如下：（调用时传IP地址即可获取对应城市编码或其他信息）

package com.test.utils.gaode;import com.alibaba.fastjson.JSONException;import com.alibaba.fastjson.JSONObject;import com.test.commons.FailException;import java.io.*;import java.net.URL;import java.nio.charset.Charset;public class GdUtil {    private static final String KEY = "17abf77d3c69e0d16c02e764f4fe6be4";       //web服务的key    private static String readAll(Reader rd) throws IOException {        StringBuilder sb = new StringBuilder();        int cp;        while ((cp = rd.read()) != -1) {            sb.append((char) cp);        }        return sb.toString();    }    private static JSONObject readJsonFromUrl(String url) throws IOException, JSONException {        InputStream is = new URL(url).openStream();        try {            BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));            String jsonText = readAll(rd);            JSONObject json = JSONObject.parseObject(jsonText);            return json;        } finally {            is.close();        }    }    public static String getCityCodeByIp(String ipAddress) {        JSONObject json = null;        String adCode = "";        try {            json = readJsonFromUrl("http://restapi.amap.com/v3/ip?ip=" + ipAddress + "&key=" + KEY + "");            if ("0".equals(json.getString("status"))){      //调用异常时，抛出返回信息，以便分析（我会在错误层统一捕获并输出到error日志）                throw new FailException("调用高德返回异常: " + json.toJSONString());            }        } catch (IOException e) {            e.printStackTrace();            throw new FailException("高德获取城市编码：", e);        }        adCode = json.getString("adcode");          //获取ip定位的城市编码（高德返回json如下，需要其他也可自行获取）        return adCode;    }    public static void main(String[] args) {        String s = GdUtil.getCityCodeByIp("60.191.12.10");        System.out.println(s);                             //330100    }}

高德返回json的格式如下（根据需要自行获取）：

{
    "status":"1",
    "info":"OK",
    "infocode":"10000",
    "province":"浙江省",
    "city":"杭州市",
    "adcode":"330100",
    "rectangle":"119.8824799,29.95931271;120.5552208,30.52048536"
}

此传入的ip为公网ip，所以我们还需要获取到请求者的公网ip：

package com.test.utils;

import javax.servlet.http.HttpServletRequest;

/**
 * 请求对象 工具类
 */
public class RequestUtils {

　　/**     * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;     *     * @param request     * @return     * @throws     */    public final static String getIpAddress(HttpServletRequest request) {        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址        String ip = request.getHeader("X-Forwarded-For");        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {                ip = request.getHeader("Proxy-Client-IP");            }            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {                ip = request.getHeader("WL-Proxy-Client-IP");            }            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {                ip = request.getHeader("HTTP_CLIENT_IP");            }            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {                ip = request.getHeader("HTTP_X_FORWARDED_FOR");            }            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {                ip = request.getRemoteAddr();            }        } else if (ip.length() > 15) {            String[] ips = ip.split(",");            for (String ip1 : ips) {                String strIp = (String) ip1;                if (!("unknown".equalsIgnoreCase(strIp))) {                    ip = strIp;                    break;                }            }        }        return ip;    }
}

实际使用示例如下：

package com.test.web.common;

import com.alibaba.fastjson.JSONObject;
import com.test.utils.RequestUtils;
import com.test.utils.gaode.GdUtil;
import org.apache.log4j.Logger;

import javax.servlet.http.HttpServletRequest;

/**
 */
@RestController
@RequestMapping(value = "/api/core")
public class TestController {
　　private Logger log = Logger.getLogger(this.getClass());

　　@RequestMapping(value = "/test", method = RequestMethod.POST)    public JsonResp test(@RequestBody JSONObject reqJson, HttpServletRequest request) {
　　　　　log.debug("测试获取访问者的城市编码")        JSONObject resJson = new JSONObject();        String ip = RequestUtils.getIpAddress(request);        String adCode = GdUtil.getCityCodeByIp(ip);        resJson.put("cityCode", adCode);        return JsonResp.ok(resJson);    }
}

通过以上方法便可以成功的获取到访问者的城市编码等信息了

高德地图获取key：可参考高德教程：https://lbs.amap.com/api/webservice/guide/create-project/get-key

1. 进入我的应用中

2. 若没有应用则创建新应用

3. 点击+号添加key

4. 填写信息，选择web服务

5. 保存提交

6. 在应用列表下的key列表中出现新添加的key

请求参数和响应参数说明（infocode状态码可参考：https://lbs.amap.com/api/webservice/guide/tools/info）