在Spring MVC中实现根据城市查询天气预报

在这里我们采用HTTP请求的方式调用webService接口来获取城市天气预报。

首先在Service层写一个获取天气预报list的接口

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Service;

/**
 * 通过HTTP  POST请求获取某个城市的天气List集合
 * @author user
 *
 */
@Service
public class WeatherService {

    public List<String> getWeatherList(String city) {

        try {
            // 第一步：创建服务地址，不是WSDL地址
            URL url = new URL("http://ws.webxml.com.cn/WebServices/WeatherWS.asmx");
            // 第二步：打开一个通向服务地址的连接
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            // 第三步：设置参数
            // 3.1发送方式设置：POST必须大写
            connection.setRequestMethod("POST");
            // 3.2设置数据格式：content-type
            connection.setRequestProperty("content-type", "text/xml;charset=utf-8");
            // 3.3设置输入输出，因为默认新创建的connection没有读写权限，
            connection.setDoInput(true);
            connection.setDoOutput(true);

            // 第四步：组织SOAP数据，发送请求
            System.out.println(city);
            String soapXML = getXML(city);
            OutputStream os = connection.getOutputStream();
            os.write(soapXML.getBytes());
            os.flush();
            os.close();
            // 第五步：接收服务端响应，打印
            int responseCode = connection.getResponseCode();
            if (200 == responseCode) {// 表示服务端响应成功
                InputStream is = connection.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);
                BufferedReader br = new BufferedReader(isr);

                StringBuilder sb = new StringBuilder();
                String temp = null;
                while (null != (temp = br.readLine())) {
                    sb.append(temp);
                }
                List<String> list = new ArrayList<String>();
                String str = sb.toString();
                str = new String(str.getBytes(), "UTF-8");
                //因为我们接受到的是一个xml格式的字符串
                //我直接采用截取字符串的方式获取天气预报信息
                while (str.contains("<string>")) {
                    String s = str.substring(str.indexOf("<string>") + 8, str.indexOf("</string>"));
                    list.add(s);
                    str = str.substring(str.indexOf("</string>") + 9);
                }
                for (String string : list) {
                    System.out.println(string);
                }

                is.close();
                isr.close();
                br.close();
                return list;
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;

    }

    /**
     * <?xml version="1.0" encoding="utf-8"?>
     * <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     * xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap=
     * "http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body>
     * <getWeather xmlns="http://WebXml.com.cn/">
     * <theCityCode>string</theCityCode> <theUserID>string</theUserID>
     * </getWeather> </soap:Body> </soap:Envelope>
     * 
     * @param phoneNum
     * @return
     */
    private String getXML(String city) {
        String soapXML = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                + "<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">"
                + "<soap:Body>" + "<getWeather xmlns=\"http://WebXml.com.cn/\">" + " <theCityCode>" + city
                + "</theCityCode>" + " <theUserID></theUserID>" + "</getWeather>" + "</soap:Body>" + "</soap:Envelope>";
        return soapXML;
    }

}

Service层写好以后我们就可以在Controller层去调用该方法了

import java.util.List;

import org.json.JSONObject;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import service.WeatherService;

/**
 * 根据城市查询天气预报
 * 
 * @author user
 *
 */
@Controller
public class WeatherController {

    @Autowired
    private WeatherService weatherService;

    /**
     * 返回city城市今天的天气情况
     * 
     * @param city
     * @return
     */
    @RequestMapping("/weather")
    @ResponseBody
    public String getWeacher(String city) {

        try {
            city = new String(city.getBytes("iso-8859-1"), "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }

        List<String> list = weatherService.getWeatherList(city);
        for (String string : list) {
            System.out.println(string);
        }
        JSONObject json = new JSONObject();
        if (list != null && list.size() > 0) {

            json.put("province", list.get(0));
            json.put("city", list.get(1));
            json.put("updateDTTM", list.get(4));
            json.put("temp", list.get(5));
            json.put("weather", list.get(6).substring((list.get(6).lastIndexOf(" ") + 1)));
            System.out.println(json.toString());
        }
        return json.toString();
    }

}

这样一个获取天气预报的接口就做好了。