Java Http GET POST发送请求

た入场券 2022-08-05 02:46 410阅读 0赞

## Java Http GET POST发送请求 ##

本文写了1个java 发送GET请求以及2个java 发送POST请求，新手，不喜勿喷！

### 背景： ###

> 这是一个使用魔宝支付的demo，首先需要移动端提交商城订单，请求平台签名接口进行签名并获取支付所需要的要素，对支付公司返回的信息验签后返回移动端这些要素，移动端启动支付公司SDK进行支付交易，后续还有接收交易结果通知消息。

### 说明 ###

>  *  GET核心：CloseableHttpClient和CloseableHttpResponse，HttpGet
>  *  POST核心：HttpURLConnection和HttpPost

### 功能步骤说明 ###

> 1.  第一步：GET请求从服务器签名接口进行签名操作；
> 2.  第二步：GET请求至魔宝支付进行获取支付所需要素；
> 3.  第三步：POST验签魔宝返回的签名信息，防篡改

### 静态变量 ###

>  *  订单信息：private static String tranData = “XML订单信息”;
>  *  签名接口：private static String signUrl = “[http://10.3.30.17:8099/chpay/v1/pay/mobao/sign][http_10.3.30.17_8099_chpay_v1_pay_mobao_sign]“;
>  *  验签接口private static String verifyUrl = “[http://10.3.30.17:8099/chpay/v1/pay/mobao/signature/verify][http_10.3.30.17_8099_chpay_v1_pay_mobao_signature_verify]“;
>  *  魔宝接口：private static String mobaoUrl = “[http://182.148.123.7:8132/service][http_182.148.123.7_8132_service]“;

### 第一步：签名 ###

*  在交易之前需要使用支付方提供的证书进行签名交易订单  
    
    
    --------------------

/** * 签名订单信息 */
    public static JSONObject testHttpGet(String data) throws UnsupportedEncodingException {
            CloseableHttpClient httpClient = HttpClients.custom().disableContentCompression().build();
            StringBuffer qUrl = new StringBuffer(signUrl);
            qUrl.append("?tranData=" + URLEncoder.encode(data, "UTF-8"));
            HttpGet httpget = new HttpGet(new String(qUrl));
            try {
                CloseableHttpResponse httpResponse = httpClient.execute(httpget);
                HttpEntity entity = httpResponse.getEntity();
                //返回内容
                String res = EntityUtils.toString(entity, "UTF-8");
                return JSONObject.parseObject(res);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }

### 第二步：获取支付要素 ###

*  使用支付方规定的格式，签名后请求支付公司接口得到支付所需要的要素，支付公司返回要素以及签名信息

public static String getPayElements(JSONObject json) throws UnsupportedEncodingException {
            if (json.containsKey("message") && json.containsKey("signature")) {
                String message = json.getString("message");
                String signature = json.getString("signature");
                String param = "message=" + message + "&signature=" + signature;
                String paramEncode = URLEncoder.encode(param, "UTF-8");
    
                CloseableHttpClient httpClient = HttpClients.custom().disableContentCompression().build();
                StringBuffer qUrl = new StringBuffer(mobaoUrl);
                qUrl.append("?message=" + URLEncoder.encode(message, "UTF-8"));
                qUrl.append("&signature=" + URLEncoder.encode(signature, "UTF-8"));
                HttpGet httpget = new HttpGet(new String(qUrl));
                try {
                    CloseableHttpResponse httpResponse = httpClient.execute(httpget);
                    HttpEntity entity = httpResponse.getEntity();
                    //返回内容
                    String res = EntityUtils.toString(entity, "UTF-8");
                    return res;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return null;
        }

### 第三步：验签 ###

*  获取支付要素时支付公司返回签名信息，需要进行验签，防止信息被篡改。

public static JSONObject verifySign(JSONObject jsonObject) {
            if (jsonObject.containsKey("message") && jsonObject.containsKey("signature")) {
                String message = jsonObject.getString("message");
                String signature = jsonObject.getString("signature");
    
                try {
                    //创建连接
                    URL url = new URL(verifyUrl);
                    HttpURLConnection connection = (HttpURLConnection) url
                            .openConnection();
                    connection.setDoOutput(true);
                    connection.setDoInput(true);
                    connection.setRequestMethod("POST");
                    connection.setUseCaches(false);
                    connection.setInstanceFollowRedirects(true);
    // connection.setRequestProperty("Accept", "application/json"); // 设置接收数据的格式
                    connection.setRequestProperty("Content-Type", "application/json");
    
                    connection.connect();
                    //POST请求
                    DataOutputStream out = new DataOutputStream(connection.getOutputStream());
                    JSONObject obj = new JSONObject();
                    obj.put("message", message);
                    obj.put("signature", signature);
                    out.writeBytes(obj.toString());
                    out.flush();
                    out.close();
    
                    //读取响应
                    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                    String lines;
                    StringBuffer sb = new StringBuffer("");
                    while ((lines = reader.readLine()) != null) {
                        lines = new String(lines.getBytes(), "utf-8");
                        sb.append(lines);
                    }
                    reader.close();
                    // 断开连接
                    connection.disconnect();
                    return JSONObject.parseObject(sb.toString());
                } catch (MalformedURLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (UnsupportedEncodingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            return null;
        }

### 附：另外一个POST请求方式 ###

public static String post(String json, String url) throws Exception{
    
            StringEntity entity = new StringEntity(json, "utf-8");
            entity.setContentType("application/json");
    
            DefaultHttpClient client = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            httpPost.setEntity(entity);
    
            HttpResponse response = client.execute(httpPost);
            InputStream inputStream = response.getEntity().getContent();
            StringBuffer buffer = new StringBuffer();
            InputStreamReader inputReader = new InputStreamReader(inputStream);
            BufferedReader bufferReader = new BufferedReader(inputReader);
            String str;
            while ((str = bufferReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferReader.close();
            String jsonOut = buffer.toString();
            return jsonOut;
        }

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> \- Q Q：1250052380  
> \- 邮箱：1250052380@qq.com

[http_10.3.30.17_8099_chpay_v1_pay_mobao_sign]: http://10.3.30.17:8099/chpay/v1/pay/mobao/sign
[http_10.3.30.17_8099_chpay_v1_pay_mobao_signature_verify]: http://10.3.30.17:8099/chpay/v1/pay/mobao/signature/verify
[http_182.148.123.7_8132_service]: http://182.148.123.7:8132/service