编写JAVA代码使用百度地图api实现可视化显示大连市没区医院数量
时间: 2023-12-03 20:47:07 浏览: 158
这里提供一个使用百度地图API的Java代码示例,实现在地图上显示大连市各区域医院数量的可视化效果。
前提:首先你需要在百度地图开放平台上注册账号,并创建一个应用,获取到AK(密钥)。
代码示例:
```java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import org.json.JSONArray;
import org.json.JSONObject;
public class MapDemo {
public static void main(String[] args) throws IOException {
String ak = "这里替换为你的AK";
String city = "大连市";
String[] districts = {"中山区", "西岗区", "沙河口区", "甘井子区", "旅顺口区", "金州区", "普兰店区", "瓦房店市", "庄河市", "长海县"};
int[] hospitalCount = new int[districts.length];
for (int i = 0; i < districts.length; i++) {
String district = districts[i];
String urlStr = "http://api.map.baidu.com/place/v2/search?query=医院®ion=" + URLEncoder.encode(city + district, "UTF-8") + "&output=json&ak=" + ak;
URL url = new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
StringBuilder sb = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
reader.close();
JSONObject jsonObj = new JSONObject(sb.toString());
int total = jsonObj.getInt("total");
hospitalCount[i] = total;
}
StringBuilder data = new StringBuilder("[");
for (int i = 0; i < districts.length; i++) {
data.append("{name:'").append(districts[i]).append("',value:").append(hospitalCount[i]).append("},");
}
data.deleteCharAt(data.length() - 1);
data.append("]");
String html = "<!DOCTYPE html>" +
"<html>" +
"<head>" +
" <meta charset=\"utf-8\">" +
" <title>大连市各区医院数量</title>" +
" <script src=\"http://api.map.baidu.com/api?v=2.0&ak=" + ak + "\"></script>" +
"</head>" +
"<body style=\"margin:0;padding:0;\">" +
" <div style=\"width:100%;height:100%;\" id=\"map\"></div>" +
" <script type=\"text/javascript\">" +
" var myChart = echarts.init(document.getElementById('map'));" +
" var option = {" +
" title: {" +
" text: '大连市各区医院数量'," +
" left: 'center'" +
" }," +
" tooltip: {" +
" trigger: 'item'," +
" formatter: '{b}: {c}'" +
" }," +
" bmap: {" +
" center: ['121.614682', '38.914003']," +
" zoom: 11," +
" roam: true" +
" }," +
" series: [{" +
" type: 'effectScatter'," +
" coordinateSystem: 'bmap'," +
" data: " + data + "," +
" symbolSize: function (val) {" +
" return val[2] / 10;" +
" }," +
" label: {" +
" normal: {" +
" formatter: '{b}'," +
" position: 'right'," +
" show: false" +
" }," +
" emphasis: {" +
" show: true" +
" }" +
" }," +
" itemStyle: {" +
" normal: {" +
" color: '#F06C00'" +
" }" +
" }" +
" }]" +
" };" +
" myChart.setOption(option);" +
" </script>" +
"</body>" +
"</html>";
System.out.println(html);
}
}
```
说明:
1. 首先获取到百度地图API的AK(密钥),并设置要查询的城市和区域;
2. 循环查询每个区域中医院的数量;
3. 将查询结果转换为JSON格式的字符串,用于在地图上显示;
4. 生成HTML页面,使用ECharts来绘制地图,并将查询结果显示在地图上。
需要注意的是,该示例代码仅供参考,如需使用请根据自己的实际情况进行修改。另外,如需使用百度地图API,建议先查看官方文档以了解API的使用方法。
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