json如下

[
    {
        "currentCity": "厦门",
        "pm25": "64",
        "index": [
            {
                "title": "穿衣",
                "zs": "较舒适",
                "tipt": "穿衣指数",
                "des": "建议着薄外套、开衫牛仔衫裤等服装。年老体弱者应适当添加衣物，宜着夹克衫、薄毛衣等。"
            },
            {
                "title": "洗车",
                "zs": "不宜",
                "tipt": "洗车指数",
                "des": "不宜洗车，未来24小时内有雨，如果在此期间洗车，雨水和路上的泥水可能会再次弄脏您的爱车。"
            },
            {
                "title": "旅游",
                "zs": "适宜",
                "tipt": "旅游指数",
                "des": "天气较好，温度适宜，总体来说还是好天气哦，这样的天气适宜旅游，您可以尽情地享受大自然的风光。"
            },
            {
                "title": "感冒",
                "zs": "少发",
                "tipt": "感冒指数",
                "des": "各项气象条件适宜，无明显降温过程，发生感冒机率较低。"
            },
            {
                "title": "运动",
                "zs": "较适宜",
                "tipt": "运动指数",
                "des": "阴天，较适宜进行各种户内外运动。"
            },
            {
                "title": "紫外线强度",
                "zs": "最弱",
                "tipt": "紫外线强度指数",
                "des": "属弱紫外线辐射天气，无需特别防护。若长期在户外，建议涂擦SPF在8-12之间的防晒护肤品。"
            }
        ],
        "weather_data": [
            {
                "date": "周一 12月21日 (实时：16℃)",
                "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/zhenyu.png",
                "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png",
                "weather": "阵雨转多云",
                "wind": "微风",
                "temperature": "19 ~ 15℃"
            },
            {
                "date": "周二",
                "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/duoyun.png",
                "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png",
                "weather": "多云",
                "wind": "微风",
                "temperature": "22 ~ 16℃"
            },
            {
                "date": "周三",
                "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/duoyun.png",
                "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/duoyun.png",
                "weather": "多云",
                "wind": "微风",
                "temperature": "24 ~ 16℃"
            },
            {
                "date": "周四",
                "dayPictureUrl": "http://api.map.baidu.com/images/weather/day/duoyun.png",
                "nightPictureUrl": "http://api.map.baidu.com/images/weather/night/zhenyu.png",
                "weather": "多云转阵雨",
                "wind": "微风",
                "temperature": "19 ~ 12℃"
            }
        ]
    }
]

代码如下

因为天气接口一般是不会变的 所以简单的给他解析下就行了。。

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;

import org.apache.tools.ant.types.CommandlineJava.SysProperties;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class BaiduWeatherApi {

	public static String getWeatherInform(String cityName) {


		String baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location=厦门&output=json&ak=W69oaDTCfuGwzNwmtVvgWfGH";
		StringBuffer strBuf;

		try {

			baiduUrl = "http://api.map.baidu.com/telematics/v3/weather?location="
					+ URLEncoder.encode(cityName, "utf-8")
					+ "&output=json&ak=57ab4d7f7882e2028de5a9a589ae697f";
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}

		strBuf = new StringBuffer();

		try {
			URL url = new URL(baiduUrl);
			URLConnection conn = url.openConnection();
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					conn.getInputStream(), "utf-8"));// ת�롣
			String line = null;
			while ((line = reader.readLine()) != null)
				strBuf.append(line + " ");
			reader.close();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return strBuf.toString();
	}


	public static void main(String[] args) {

		String strPar=BaiduWeatherApi.getWeatherInform("厦门");
		 JSONObject dataOfJson = JSONObject.fromObject(strPar);
		 System.out.println(dataOfJson);
		 if(dataOfJson.getInt("error")!=0){
			 System.out.println("没有获取到数据");
		 }else{

			 System.out.println("日期："+dataOfJson.getString("date"));
			// ;
			 System.out.println(dataOfJson.getString("results"));
			 JSONArray array  =JSONArray.fromObject(dataOfJson.getString("results"));
			 JSONObject data = JSONObject.fromObject(array.get(0).toString());
			 System.out.println("城市："+data.getString("currentCity"));
			 JSONArray arrayweather  =JSONArray.fromObject(data.getString("weather_data"));

			 JSONObject weather = JSONObject.fromObject(arrayweather.get(0).toString());
//			 "weather":"晴",
//             "wind":"东北风3-4级",
//             "temperature":"15 ~ 9℃"
			 System.out.println("天气："+weather.getString("weather"));
			 System.out.println("风向："+ weather.getString("wind"));
			 System.out.println("温度："+ weather.getString("temperature"));

		 }

	}

}