Java调用百度地图API

本实战代码将使用百度地图的接口来实现以下功能：

  1.确定输入地址的坐标

  2.两个坐标的距离

 

其他的话，还要使用百度账户申请相关的api，具体见：

http://lbsyun.baidu.com/index.php?title=webapi

 

示例代码：

import com.alibaba.fastjson.JSON;import com.google.common.collect.ImmutableMap;import org.apache.commons.lang3.StringUtils;import org.apache.http.client.fluent.Request;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Service;import java.io.IOException;import java.util.Map;/** * 百度地图api接口调用 */@Service("geocodingService")@Transactionalpublic class GeocodingService {    private static final Logger LOG = LoggerFactory.getLogger(GeocodingService.class);    private static final Double PI = Math.PI;    private static final Double PK = 180 / PI;    private static final String MAP_URL= "http://api.map.baidu.com/geocoder/v2/?ak=4rcKAZKG9OIl0wDkICSLx8BA&output=json&address=";    /**     * 根据地址获取经纬度     * @param address     * @return     */    private Map<String,Double> getLatAndLngByAddress(String address){        Map<String,Double> poiMap = null;        String result = null;        try {            result = Request.Get(MAP_URL+ address)                    .connectTimeout(1000).socketTimeout(1000)                    .execute().returnContent().asString();        } catch (IOException e) {            LOG.error("调用百度地图API获取{}的经纬度，抛错{}",address,e);        }        if (StringUtils.isNotBlank(result) && "0".equals(JSON.parseObject(result).get("status") + "")){            String lat = result.substring(result.indexOf("\"lat\":")                    + ("\"lat\":").length(), result.indexOf("},\"precise\""));            String lng = result.substring(result.indexOf("\"lng\":")                    + ("\"lng\":").length(), result.indexOf(",\"lat\""));            poiMap = ImmutableMap.of("lat",Double.parseDouble(lat),"lng",Double.parseDouble(lng));        }        return poiMap;    }    /**     * 计算两个地址的距离（米）     * @param address     * @param otherAddress     * @return     */    public Double getDistanceFromTwoPlaces(String address,String otherAddress){        Double distance = null;        if (StringUtils.isNotBlank(address) && StringUtils.isNotBlank(otherAddress)){            address = address.trim();            otherAddress = otherAddress.trim();            if (address.equals(otherAddress)){                return 0.0d;            }            Map pointA = getLatAndLngByAddress(address);            Map pointB = getLatAndLngByAddress(otherAddress);            distance = getDistanceFromTwoPoints(pointA,pointB);        }        return distance;    }    /**     * 获取两个经纬度之间的距离（单位：米）     * @param pointA     * @param pointB     * @return     */    private Double getDistanceFromTwoPoints(Map pointA, Map pointB) {        Double distance = null;        if (pointA != null && !pointA.isEmpty() && pointB != null && !pointB.isEmpty()){            double lat_a = (double) pointA.get("lat");            double lng_a = (double) pointA.get("lng");            double lat_b = (double) pointB.get("lat");            double lng_b = (double) pointB.get("lng");            if (lat_a == lat_b && lng_a == lng_b){                return 0.0d;            }            double t1 = Math.cos(lat_a / PK) * Math.cos(lng_a / PK) * Math.cos(lat_b / PK) * Math.cos(lng_b / PK);            double t2 = Math.cos(lat_a / PK) * Math.sin(lng_a / PK) * Math.cos(lat_b / PK) * Math.sin(lng_b / PK);            double t3 = Math.sin(lat_a / PK) * Math.sin(lat_b / PK);            double tt = Math.acos(t1 + t2 + t3);            distance = 6366000 * tt;        }        return distance;    }}

 

http://blog.csdn.net/u013142781/article/details/47085369