Java 调用api，json化结果

三方api文档：http://api.chinaz.com/ApiDetails/Alexa

package com.etoak.crawl.my.alexa;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;


/**
 * Description  TODO
 **/
public class HttpPost {
    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param httpUrl
     *            发送请求的 URL
     * @param param
     *            请求参数是json
     * @return 所代表远程资源的响应结果
     */
    public static String doPost(String httpUrl, String param) {
        HttpURLConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        BufferedReader br = null;
        String result = null;
        try {
            URL url = new URL(httpUrl);
            // 通过远程url连接对象打开连接
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接请求方式
            connection.setRequestMethod("POST");
            // 设置连接主机服务器超时时间：15000毫秒
            connection.setConnectTimeout(15000);
            // 设置读取主机服务器返回数据超时时间：60000毫秒
            connection.setReadTimeout(60000);

            // 默认值为：false，当向远程服务器传送数据/写数据时，需要设置为true
            connection.setDoOutput(true);
            // 默认值为：true，当前向远程服务读取数据时，设置为true，该参数可有可无
            connection.setDoInput(true);
            // 设置传入参数的格式:请求参数应该是 name1=value1&name2=value2 的形式。
            connection.setRequestProperty("Content-Type", "application/json");
            // 设置鉴权信息：Authorization: Bearer da3efcbf-0845-4fe3-8aba-ee040be542c0
            // connection.setRequestProperty("Authorization", "Bearer
            // da3efcbf-0845-4fe3-8aba-ee040be542c0");
            // 通过连接对象获取一个输出流
            os = connection.getOutputStream();
            // 通过输出流对象将参数写出去/传输出去,它是通过字节数组写出的
            if (param != null && param.length() > 0) {
                os.write(param.getBytes());
            }

            // 通过连接对象获取一个输入流，向远程读取
            if (connection.getResponseCode() == 200) {

                is = connection.getInputStream();
                // 对输入流对象进行包装:charset根据工作项目组的要求来设置
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));

                StringBuffer sbf = new StringBuffer();
                String temp = null;
                // 循环遍历一行一行读取数据
                while ((temp = br.readLine()) != null) {
                    sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {
                    br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != is) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            // 断开与远程地址url的连接
            connection.disconnect();
        }
        return result;
    }

    public static String doAlexaPost(String httpUrl) {
        String urlRoot = "http://apidata.chinaz.com/CallAPI/Alexa?key=你的key&domainName=";
        return doPost(urlRoot + httpUrl, null);
    }

    public static void main(String[] args) {

        String url = "aliexpress.com";
        //String url = "https://www.aliexpress.com/";
        String returnString = doAlexaPost(url);
        System.out.println(returnString);

        JSONObject jsonObject = JSON.parseObject(returnString);
        Integer stateCode = jsonObject.getInteger("StateCode");
        System.out.println("stateCode = " + stateCode);
        if(!stateCode.equals(1)){
            return;
        }

        JSONObject result = jsonObject.getJSONObject("Result");
        Integer globalRank = result.getInteger("Rank");
        Integer ipNum = result.getInteger("IpNum");
        Integer pvNum = result.getInteger("PvNum");
        System.out.println("globalRank = " + globalRank);
        System.out.println("ipNum = " + ipNum);
        System.out.println("pvNum = " + pvNum);

        JSONArray countryList = result.getJSONArray("CountryList");
        if(countryList.isEmpty()){
            return;
        }

        for (int i = 0; i < countryList.size(); i++) {
            System.out.println();
            System.out.println("--------------------------");
            System.out.println();

            JSONObject country = countryList.getJSONObject(i);
            String countryName = country.getString("Name");
            String countryCode = country.getString("Code");
            Integer countryRank = country.getInteger("Rank");
            JSONObject contribution = country.getJSONObject("Contribution");
            String pageViewsPercent = contribution.getString("PageViews");
            String usersPercent = contribution.getString("Users");

            System.out.println("countryName = " + countryName);
            System.out.println("countryCode = " + countryCode);
            System.out.println("countryRank = " + countryRank);
            System.out.println("pageViewsPercent = " + pageViewsPercent);
            System.out.println("usersPercent = " + usersPercent);

        }
    }
}

返回结果：
stateCode = 1
globalRank = 31
ipNum = 8175000
pvNum = 70386750
--------------------------
countryName = 摩洛哥
countryCode = MA
countryRank = 14
pageViewsPercent = 1.6%
usersPercent = 1.4%
--------------------------
countryName = 印度
countryCode = IN
countryRank = 79
pageViewsPercent = 5.1%
usersPercent = 4.0%
--------------------------
countryName = 埃及
countryCode = EG
countryRank = 79
pageViewsPercent = 0.5%
usersPercent = 0.7%
posted @ 2020-01-17 15:47 为爱奋斗不息阅读(806) 评论(0) 编辑收藏举报
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Java 调用api，json化结果

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