媒介

最近一个项目顶用到了微信开拓，之前没有做过付出相关的对象，算是拿这个来练练手，刚开始打仗付出时候很懵逼，加上微信付出开拓文档原来就讲得不清楚，我是彻底蒙圈了，参考了许多代码之后，算是有一点思路了。

用户认证获取openId

假如你常识存眷付出流程，这块可以跳过，因为我知道这些你已经做过了，在开始所有的流程之前，我以为你应该把所有微信相关的设置放到一个properties文件中去，这样不只显得更类型，并且会制止犯许多错误，真是一个完美的选择！

######## 设置文件
######## 公家号开拓设置中的token(自界说)
wechat.token=
######## 应用id
wechat.appId=
######## 密钥(同token查察地点)
wechat.appSecret=
######## 静默授权微信回调url
wechat.callBackSlientUrl=
######## 商户Id(付出相关)
wechat.MCHID=
######## 微信下单地点
wechat.wxorder=https://api.mch.weixin.qq.com/pay/unifiedorder
######## 付出api密钥
wechat.KEY=
######## 付出功效回调地点
wechat.NOTIFYURL=

接着你可以思量把这个properties注入到一个bean中，利用更利便，虽然你还可以选择利用java来读取properties的设置，比拟这两个要领，我更喜欢第一个，我就利用第一种要领来演示一下(这里利用spring boot框架，spring mvc雷同)

/**
 * <p>Created on 2017/3/13.</p>
 *
 * @author StormMma
 *
 * @Description: 微信相关常量
 */
@Component
@ConfigurationProperties(locations = {"classpath:config/wechat.properties"}, prefix = "wechat")
public class WeChatConfigBean {
    /**
     * token
     */
    private String token;
    /**
     * app id
     */
    private String appId;
    /**
     * app secret
     */
    private String appSecret;
    /**
     * 静默授权回调地点
     */
    private String callBackSlientUrl;
    /**
     * 商户id
     */
    private String MCHID;
    /**
     * 异步回调地点
     */
    private String NOTIFYURL;
    /**
     * 微信统一下单地点
     */
    private String wxorder;
    /**
     * key
     */
    private String KEY;
    public String getToken() {
        return token;
    }
    public void setToken(String token) {
        this.token = token;
    }
    public String getAppId() {
        return appId;
    }
    public void setAppId(String appId) {
        this.appId = appId;
    }
    public String getAppSecret() {
        return appSecret;
    }
    public void setAppSecret(String appSecret) {
        this.appSecret = appSecret;
    }
    public String getCallBackSlientUrl() {
        return callBackSlientUrl;
    }
    public void setCallBackSlientUrl(String callBackSlientUrl) {
        this.callBackSlientUrl = callBackSlientUrl;
    }
    public String getMCHID() {
        return MCHID;
    }
    public void setMCHID(String MCHID) {
        this.MCHID = MCHID;
    }
    public String getNOTIFYURL() {
        return NOTIFYURL;
    }
    public void setNOTIFYURL(String NOTIFYURL) {
        this.NOTIFYURL = NOTIFYURL;
    }
    public String getWxorder() {
        return wxorder;
    }
    public void setWxorder(String wxorder) {
        this.wxorder = wxorder;
    }
    public String getKEY() {
        return KEY;
    }
    public void setKEY(String KEY) {
        this.KEY = KEY;
    }

封装请求东西(这次我选择利用HttpClient, 此处的json东西我选择了ali的fastjson)

RequestUtil.java

/**
    * 发送Get请求到url，得到response的json实体
    * @param url
    * @return
    * @throws IOException
    */
   private JSONObject doGetUrl(String url) throws WechatException, ServerSystemException {
       CloseableHttpClient httpclient = HttpClients.createDefault();
       HttpGet httpGet = new HttpGet(url);
       CloseableHttpResponse response;
       String result;
       try {
           response = httpclient.execute(httpGet);
           HttpEntity entity = response.getEntity();
           result = EntityUtils.toString(entity, "UTF-8");
           httpclient.close();
       } catch (IOException e) {
           logger.error("执行GET请求产生错误!", e);
           throw new ServerSystemException("执行GET请求产生错误！{}", e);
       }
       return JSONObject.parseObject(result);
   }
   /**
    * 发送post请求
    * @param url
    * @param param
    * @return
    * @throws ServerSystemException
    */
   private JSONObject doPostUrl(String url, String param) throws ServerSystemException {
       final String CONTENT_TYPE_TEXT_JSON = "application/json";
       DefaultHttpClient httpClient = new DefaultHttpClient(new PoolingClientConnectionManager());
       HttpPost httpPost = new HttpPost(url);
       HttpResponse response;
       String result;
       try {
           StringEntity stringEntity = new StringEntity(param);
           stringEntity.setContentType(CONTENT_TYPE_TEXT_JSON);
           stringEntity.setContentEncoding("UTF-8");
           httpPost.setEntity(stringEntity);
           response = httpClient.execute(httpPost);
           HttpEntity entity = response.getEntity();
           result = EntityUtils.toString(entity, "UTF-8");
           httpClient.close();
       } catch (IOException e) {
           logger.error("执行POST请求产生错误!", e);
           throw new ServerSystemException("执行POST请求产生错误！{}", e);
       }
       return JSONObject.parseObject(result);
   }

获取code

在此之前，我想我们应该抽出一个微信东西类，专门来封装各类请求和RequestUtil来团结利用，是的，这是一个很好的选择。