Java实现Web Api接口远程调用

package com.watering.as.web.utils;

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);

    }  

}

Web Api 接口调用大同小异 , 各位看客可参考此类 , 希望对各位有帮助

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