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
        }