Java实现京东联盟API数据获取功能

一：api参数

京东联盟提供了一个SDK的包下载好加入到项目中，SDK封装了api的调用方法，代码就是每个api的调用实例如下把申请的四个参数填好就行。

String SERVER_URL = "https://api.jd.com/routerjson";
String accessToken = null;
String appKey = "";
String appSecret = "";
JdClient client=new DefaultJdClient(SERVER_URL,accessToken,appKey,appSecret);
UnionOpenGoodsJingfenQueryRequest request=new UnionOpenGoodsJingfenQueryRequest();
JFGoodsReq goodsReq=new JFGoodsReq();
goodsReq.setEliteId(1);
request.setGoodsReq(goodsReq);
request.setVersion("1.0");
UnionOpenGoodsJingfenQueryResponse response=client.execute(request);
System.out.println(response);

加入俩个依赖。

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.2</version>
</dependency>
<dependency>
     <groupId>org.codehaus.jackson</groupId>
     <artifactId>jackson-core-asl</artifactId>
     <version>1.9.2</version>
</dependency>

是不是按照我上面的来System.out.println(response)，没有拿到数据，就是一串包名 com.jd.open.api.sdk.response.kplunion.UnionOpenGoodsJingfenQueryResponse@1df82230不要慌，因为是在Java中集合是打印不出来的，只需要转化为string就能出来数据。这样String json = JSON.toJSONString(response)，就出来数据了咯。

二：在一个util里写一个httpclient方法

    public static String doGet(String url) {
        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();
        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            URI uri = builder.build();
            // 创建http GET请求
            HttpGet httpGet = new HttpGet(uri);
            // 执行请求
            response = httpclient.execute(httpGet);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
                httpclient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return resultString;
    }

business是入参参数前端传入的就必须是网址格式先调用getBusiness，在传参，method是地址，例jd.union.open.activity.query我用的是一个URL拼接的方法。详情https://jos.jd.com/commontools?id=2，appKey，appSecret写好。

private static String appKey="";
private static String appSecret="";

    public String getGoodsJingfenQuery(String business,String method) {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式
        String date = df.format(new Date());// new Date()为获取当前系统时间，也可使用当前时间戳
        String rc =getBusinessnot(business);//把入参参数转化成json格式
        String sj =getTime(date);//把时间转化网址格式
        String str =appSecret+"360buy_param_json"+rc+"app_key"+appKey+"method"+method+"sign_methodmd5timestamp"+date+"v1.0"+appSecret;
        String sign=MD5(str);//获取签名，MD5 32位的加密
        String url="https://api.jd.com/routerjson?360buy_param_json="+newbusiness+"&app_key="+appKey+"&method="+method+"&sign_method=md5&timestamp="+sj+"&v=1.0&sign="+sign;
        return httpClientUtil.doGet(url,null);
    }

里面一些方法。

    public String getBusiness(String business) {
        String a = business.replace("{","%7B");
        String b = a.replace(":","%3A");
        String c = b.replace("}","%7D");
        return c.replace("\"","%22");
    }
    public String getBusinessnot(String business) {
        String a = business.replace("%7B","{");
        String b = a.replace("%3A",":");
        String c = b.replace("%7D","}");
        return c.replace("%22","\"");
    }
    public String getTime(String time) {
        String a = time.replace(" ","+");
        return a.replace(":","%3A");
    }
    public String getMD5(String str) {
        try {
            MessageDigest md = MessageDigest.getInstance("MD5");
            md.update(str.getBytes());
            return new BigInteger(1, md.digest()).toString(16);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }
    public static String MD5(String s) {
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
        try {
            byte[] btInput = s.getBytes();
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

这样就拿到了京东联盟的数据。

有一个毒点，我用带参的httpclient方法map<string,string> param =new treemap<>();，而不是写一长串url，列如param.put("360buy_param_json","{\"goodsReq\":{\"eliteId\":\"1\"}}");我试了传过去报json转化异常，不知道咋解决。

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