Java 通过get post 请求url

1️⃣.已获取小程序的access_token 为例，通过Get请求url

  import com.alibaba.fastjson.JSONObject;

  String wechatUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}";

 String appId = "xxxx";
 String secret = "xxxxx";

  String getUrl = MessageFormat.format(wechatUrl, appId, secret);

  URL url = new URL(urlStr);
  JSONObject jsonObject;
 try (InputStream inputStream = url.openStream()) {
     jsonObject = JSONObject.parseObject(IOUtils.toString(inputStream));
 }
 if (jsonObject.containsKey("errmsg")) {
        throw new LobsterException("获取token，原因：" + jsonObject.getString("errmsg"));
    }
 return jsonObject.getString("access_token");

2️⃣.已获取小程序码为例，通过Post请求url   也可以参考https://www.cnblogs.com/bchange/p/9156178.html

1.先设置小程序码参数

 package com.ieou.lobster.dto;

 public class MiniProgramsCode {

     private String scene;
     private String page = "pages/shop/shop";
     private int width = 300;
     private Boolean auto_color;
     private Object line_color;

     public String getScene() {
         return scene;
     }

     public void setScene(String scene) {
         this.scene = scene;
     }

     public String getPage() {
         return page;
     }

     public void setPage(String page) {
         this.page = page;
     }

     public int getWidth() {
         return width;
     }

     public void setWidth(int width) {
         this.width = width;
     }

     public Boolean getAuto_color() {
         return auto_color;
     }

     public void setAuto_color(Boolean auto_color) {
         this.auto_color = auto_color;
     }

     public Object getLine_color() {
         return line_color;
     }

     public void setLine_color(Object line_color) {
         this.line_color = line_color;
     }
 }

2.对URL进行Post请求

 import org.apache.http.HttpResponse;
 import org.apache.http.client.methods.HttpPost;
 import org.apache.http.entity.StringEntity;
 import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClientBuilder;

 public String getMiniProgramsQRCode(Integer restaurantId, String tableNumber, Integer tableNumberId) throws Exception {

         String accessToken = getMiniProgramsAccessToken();

         MiniProgramsCode miniProgramsCode = new MiniProgramsCode();

         String str = restaurantId.toString() + "*" + tableNumberId.toString() + "*" + tableNumber;
         miniProgramsCode.setScene(str);
         miniProgramsCode.setAuto_color(true);
         //设置颜色
         MiniProgramsCodeRgb miniProgramsCodeRgb = new MiniProgramsCodeRgb();
         miniProgramsCode.setLine_color(miniProgramsCodeRgb);

         CloseableHttpClient build = HttpClientBuilder.create().build();
         String postUrl = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken;
         HttpPost httpPost = new HttpPost(postUrl);
         httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
         String jsonStr = JSONObject.toJSONString(miniProgramsCode);
         StringEntity se = new StringEntity(jsonStr,"UTF-8");  // 中文乱码解决
         se.setContentType("text/json");
         se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
         httpPost.setEntity(se);
         HttpResponse httpResponse = build.execute(httpPost);

　　　　　　if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
    　　　　　　　String result = EntityUtils.toString(httpResponse.getEntity());// 返回json格式：
    　　　　　　 JSONObject response = JSON.parseObject(result);
　　　　　　　　}

         InputStream inputStream = httpResponse.getEntity().getContent();   //返回流格式
         }