Java实现Web Api接口远程调用文章标题

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;
import net.sf.json.JSONObject;

public class WebApiReturnJson {
public static void main(String[] args) throws Exception {

//定义变量属性 后期可采用动态获取
String dataCode = "NAFP_NWFD_SCMOC";
String time = "201711231000";
double minLon = 116.21;
double maxLon = 116.45;
double minLat = 41.17;
double maxLat = 41.33;
String fcstLevel = "-";
String fcstEle = "ERH";
int validTime = 12;

//外接口URL路径拼接
String urlStr = "http://api.data.cma.cn:8090/api"
+ "?userId=Jlkj_jlkj_user"
+ "&pwd=123456"
+ "&interfaceId=getNafpEleGridInRectByTimeAndLevelAndValidtime"
+ "&dataCode=" + dataCode
+ "&time=" + time
+ "&minLon=" + minLon
+ "&maxLon=" + maxLon
+ "&minLat=" + minLat
+ "&maxLat=" + maxLat
+ "&fcstLevel=" + fcstLevel
+ "&fcstEle=" + fcstEle
+ "&validTime=" + validTime
+ "&dataFormat=json".replace(" ","");
//链接URL
URL url=new URL(urlStr);
//返回结果集
StringBuffer document = new StringBuffer();
//创建链接
URLConnection conn = url.openConnection();
//读取返回结果集
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"utf-8"));
String line = null;
while ((line = reader.readLine()) != null){
document.append(line);
}
reader.close();

JSONObject json =JSONObject.fromObject(document.toString());

//获取json中某个对象
String str =(String)json.get("requestParams");
System.out.println(str);

//由于requestParams包含全部str字符串数据,现将str转Map
String[] strs = str.split("&");
Map<String, String> m = new HashMap<String, String>();
for(String s:strs){
String[] ms = s.split("=");
m.put(ms[0], ms[1]);
}
System.out.println(m.get("minlon"));

//获取json串中具体值  后期可根据key随意调取存入数据库
String obj = (String)json.get("requestTime");
System.out.println(obj);

}
}