网络API调用与Json的处理

网络API调用与Json的处理经常听说API调用工程师，可什么是API呢？我自己写的Controller算Api吗？其实API就是接口，你自己写的控制层逻辑肯定也算API，但是通常意义上，我们偶尔会调用网络上的API供自己使用，以降低开发难度。获取网络API这里的方法多种多样，网上也有很多稀奇古怪的API可供调用。这里我选择的是一个天气API（前50次白嫖）https://www.apishop.

DragonZhuCn

1239人浏览 · 2021-11-16 11:06:15

DragonZhuCn · 2021-11-16 11:06:15 发布

网络API调用与Json的处理

经常听说API调用工程师，可什么是API呢？我自己写的Controller算Api吗？其实API就是接口，你自己写的控制层逻辑肯定也算API，但是通常意义上，我们偶尔会调用网络上的API供自己使用，以降低开发难度。

获取网络API

这里的方法多种多样，网上也有很多稀奇古怪的API可供调用。这里我选择的是一个天气API（前50次白嫖）

https://www.apishop.net/#/

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-bBDCxakv-1637031922758)(https://z3.ax1x.com/2021/11/15/I2wDFH.png)]

发送API请求

引入阿里巴巴的FastJson

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.73</version>
</dependency>

引入工具类

package com.zxl.src.Utils;

import com.alibaba.fastjson.JSONObject;
import com.zxl.src.entity.Result;
import com.zxl.src.entity.Weather;
import org.springframework.http.*;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.stereotype.Component;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

@Component
public class ApiUtil {
    /**
     * 请求接口
     *
     * @param method  请求方法
     * @param url     请求地址
     * @param headers 请求头部
     * @param params  请求参数
     * @return
     */
    //@Autowired
    //private WeatherMapper weatherMapper;

    public static String proxyToDesURL(String method, String url, Map<String, String> headers,
                                       Map<String, String> params) {
        // TODO Auto-generated method stub
        try {
            SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
            RestTemplate restTemplate = new RestTemplate(requestFactory);
            //处理请求头部
            HttpHeaders requestHeaders = new HttpHeaders();
            if (headers != null && !headers.isEmpty()) {
                Set<String> set = headers.keySet();
                for (Iterator<String> iterator = set.iterator(); iterator.hasNext(); ) {
                    String key = iterator.next();
                    String value = headers.get(key);
                    requestHeaders.add(key, value);
                }
            }
            //处理请求参数
            MultiValueMap<String, String> paramList = new LinkedMultiValueMap<String, String>();
            if (params != null && !params.isEmpty()) {
                if (method.equalsIgnoreCase("GET")) {
                    url += "?";
                    Set<String> set = params.keySet();
                    for (Iterator<String> iterator = set.iterator(); iterator.hasNext(); ) {
                        String key = iterator.next();
                        String value = params.get(key);
                        url += key + "=" + value + "&";
                    }
                    url = url.substring(0, url.length() - 1);
                } else {
                    Set<String> set = params.keySet();
                    for (Iterator<String> iterator = set.iterator(); iterator.hasNext(); ) {
                        String key = iterator.next();
                        String value = params.get(key);
                        paramList.add(key, value);
                    }
                }
            }
            requestHeaders.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
            HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(
                    paramList, requestHeaders);
            //处理请求方法
            HttpMethod requestType = HttpMethod.GET;
            method = method.toUpperCase();
            switch (method) {
                case "GET":
                    requestType = HttpMethod.GET;
                    break;
                case "POST":
                    requestType = HttpMethod.POST;
                    break;
                case "PUT":
                    requestType = HttpMethod.PUT;
                    break;
                case "DELETE":
                    requestType = HttpMethod.DELETE;
                    break;
                case "HEAD":
                    requestType = HttpMethod.HEAD;
                    break;
                case "OPTIONS":
                    requestType = HttpMethod.OPTIONS;
                    break;
                default:
                    requestType = HttpMethod.GET;
                    break;
            }
            ResponseEntity<String> responseEntity = restTemplate.exchange(url, requestType, requestEntity,
                    String.class, params);
            //获取返回结果
            return responseEntity.getBody();
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        return null;
    }
}

调用

关键代码

//1，获取到的数据为String格式
String result = apiUtil.proxyToDesURL(requestMethod, url, null, params);
if (result != null) {
    //2，将获取到的数据为String转换为Json
	JSONObject jsonObject = JSONObject.parseObject(result);
    String status_code = jsonObject.getString("statusCode");
    	if (status_code.equals("000000")) {
        //3，状态码为000000, 说明请求成功
        System.out.println("请求成功：" + jsonObject.getString("result"));
        //4，获取到Json中的Result数据
        JSONObject json = JSONObject.parseObject(jsonObject.getString("result"));
        //⭐5,将Result数据转换为实体类⭐
        Result result1 = JSONObject.toJavaObject(json, Result.class);
        System.out.println(result1.getDayList());
        //6，一个Result中有多个Weather
        for(int i = 0;i<result1.getDayList().size();i++){
        	Weather weather = result1.getDayList().get(i);
            //7，将所有Weather插入到数据库中
            weatherMapper.insert(weather);
        }
        } else {
			// 状态码非000000, 说明请求失败
            System.out.println("请求失败：" + jsonObject.getString("desc"));
            return null;
	}
}

处理前

{"area":"武汉","areaCode":"420100","areaid":"101200101","dayList":[{"area":"武汉","night_wind_direction":"东北风","night_air_temperature":"10","night_weather_pic":"http://app1.showapi.com/weather/icon/night/00.png","day_weather_code":"00","night_weather":"晴","night_weather_code":"00","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"22","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"东风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211115"},{"area":"武汉","night_wind_direction":"北风","night_air_temperature":"12","night_weather_pic":"http://app1.showapi.com/weather/icon/night/01.png","day_weather_code":"00","night_weather":"多云","night_weather_code":"01","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"17","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"东北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211116"},{"area":"武汉","night_wind_direction":"西南风","night_air_temperature":"8","night_weather_pic":"http://app1.showapi.com/weather/icon/night/01.png","day_weather_code":"00","night_weather":"多云","night_weather_code":"01","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"18","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211117"},{"area":"武汉","night_wind_direction":"东南风","night_air_temperature":"10","night_weather_pic":"http://app1.showapi.com/weather/icon/night/00.png","day_weather_code":"00","night_weather":"晴","night_weather_code":"00","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"20","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"南风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211118"},{"area":"武汉","night_wind_direction":"东北风","night_air_temperature":"11","night_weather_pic":"http://app1.showapi.com/weather/icon/night/07.png","day_weather_code":"00","night_weather":"小雨","night_weather_code":"07","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"21","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"东风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211119"},{"area":"武汉","night_wind_direction":"北风","night_air_temperature":"7","night_weather_pic":"http://app1.showapi.com/weather/icon/night/07.png","day_weather_code":"07","night_weather":"小雨","night_weather_code":"07","day_weather":"小雨","day_wind_power":"3-4级","day_air_temperature":"15","day_weather_pic":"http://app1.showapi.com/weather/icon/day/07.png","day_wind_direction":"东北风","areaCode":"420100","areaid":"101200101","night_wind_power":"3-4级","daytime":"20211120"},{"area":"武汉","night_wind_direction":"无持续风向","night_air_temperature":"0","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"02","night_weather":"阴","night_weather_code":"02","day_weather":"阴","day_wind_power":"4-5级","day_air_temperature":"14","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211121"},{"area":"武汉","night_wind_direction":"北风","night_air_temperature":"5","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"02","night_weather":"阴","night_weather_code":"02","day_weather":"阴","day_wind_power":"0-3级","day_air_temperature":"11","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"东北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211122"},{"area":"武汉","night_wind_direction":"南风","night_air_temperature":"3","night_weather_pic":"http://app1.showapi.com/weather/icon/night/00.png","day_weather_code":"02","night_weather":"晴","night_weather_code":"00","day_weather":"阴","day_wind_power":"0-3级","day_air_temperature":"11","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"西南风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211123"},{"area":"武汉","night_wind_direction":"东北风","night_air_temperature":"5","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"00","night_weather":"阴","night_weather_code":"02","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"13","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"南风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211124"},{"area":"武汉","night_wind_direction":"东南风","night_air_temperature":"6","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"02","night_weather":"阴","night_weather_code":"02","day_weather":"阴","day_wind_power":"0-3级","day_air_temperature":"13","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"东北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211125"},{"area":"武汉","night_wind_direction":"北风","night_air_temperature":"7","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"02","night_weather":"阴","night_weather_code":"02","day_weather":"阴","day_wind_power":"0-3级","day_air_temperature":"14","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"东南风","areaCode":"420100","areaid":"101200101","night_wind_power":"3-4级","daytime":"20211126"},{"area":"武汉","night_wind_direction":"北风","night_air_temperature":"4","night_weather_pic":"http://app1.showapi.com/weather/icon/night/00.png","day_weather_code":"02","night_weather":"晴","night_weather_code":"00","day_weather":"阴","day_wind_power":"3-4级","day_air_temperature":"11","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"东北风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211127"},{"area":"武汉","night_wind_direction":"东风","night_air_temperature":"4","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"00","night_weather":"阴","night_weather_code":"02","day_weather":"晴","day_wind_power":"0-3级","day_air_temperature":"11","day_weather_pic":"http://app1.showapi.com/weather/icon/day/00.png","day_wind_direction":"东风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211128"},{"area":"武汉","night_wind_direction":"西北风","night_air_temperature":"5","night_weather_pic":"http://app1.showapi.com/weather/icon/night/02.png","day_weather_code":"02","night_weather":"阴","night_weather_code":"02","day_weather":"阴","day_wind_power":"0-3级","day_air_temperature":"12","day_weather_pic":"http://app1.showapi.com/weather/icon/day/02.png","day_wind_direction":"东风","areaCode":"420100","areaid":"101200101","night_wind_power":"0-3级","daytime":"20211129"}],"ret_code":0}

处理后

[com.zxl.src.entity.Weather@4fe59ebc,
com.zxl.src.entity.Weather@299505ed,
com.zxl.src.entity.Weather@221a9e47, 
com.zxl.src.entity.Weather@12771f00,
com.zxl.src.entity.Weather@7104638c,
com.zxl.src.entity.Weather@703faa2c,
com.zxl.src.entity.Weather@6a1eaca, 
com.zxl.src.entity.Weather@2c047a01,
com.zxl.src.entity.Weather@7ece640e,
com.zxl.src.entity.Weather@732ddf31, 
com.zxl.src.entity.Weather@7ad39c24, 
com.zxl.src.entity.Weather@7508350d,
com.zxl.src.entity.Weather@786bc1b6, 
com.zxl.src.entity.Weather@65a25ddd, 
com.zxl.src.entity.Weather@376cff1]

实体类Result

package com.zxl.src.entity;

import lombok.Data;
import java.util.List;
@Data
public class Result {

    private String area;

    private String areaCode;

    private String areaid;
	//Result与Weather的一对多关系
    private List<Weather> dayList;
}

实体类Weather

package com.zxl.src.entity;

import lombok.Data;
import java.io.Serializable;

/**
 * (Weather)实体类
 *
 * @author makejava
 * @since 2021-11-15 15:15:35
 */
@Data
public class Weather implements Serializable {
    private static final long serialVersionUID = 190536807806957640L;
    /**
     * 地区名称
     */
    private String area;
    /**
     * 地区ID
     */
    private String areaid;
    /**
     * 日平均温度
     */
    private String dayAirTemperature;
    /**
     * 天气状况
     */
    private String dayWeather;
    /**
     * 天气状况编码
     */
    private String dayWeatherCode;
    /**
     * 天气状况示例图片
     */
    private String dayWeatherPic;
    /**
     * 风向
     */
    private String dayWindDirection;
    /**
     * 风力
     */
    private String dayWindPower;
    /**
     * 日期
     */
    private String daytime;
    /**
     * 晚间温度
     */
    private String nightAirTemperature;
    /**
     * 晚间天气状况
     */
    private String nightWeather;
    /**
     * 晚间天气状态编码
     */
    private String nightWeatherCode;
    /**
     * 晚间天气状况示例图
     */
    private String nightWeatherPic;
    /**
     * 晚间风向
     */
    private String nightWindDirection;

    private Integer id;
}