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

1 1  import com.alibaba.fastjson.JSONObject;
2 2  
3 3  String wechatUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={0}&secret={1}";
4 4 
5 5 String appId = "xxxx";
6 6 String secret = "xxxxx";
7 7 
8 8  String getUrl = MessageFormat.format(wechatUrl, appId, secret);
9 9 
1010  URL url = new URL(urlStr);
1111  JSONObject jsonObject;
1212 try (InputStream inputStream = url.openStream()) {
1313     jsonObject = JSONObject.parseObject(IOUtils.toString(inputStream));
1414 }
1515 if (jsonObject.containsKey("errmsg")) {
1616        throw new LobsterException("获取token，原因：" + jsonObject.getString("errmsg"));
1717    }
1818 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

1 1 package com.ieou.lobster.dto;
2 2 
3 3 public class MiniProgramsCode {
4 4 
5 5     private String scene;
6 6     private String page = "pages/shop/shop";
7 7     private int width = 300;
8 8     private Boolean auto_color;
9 9     private Object line_color;
1010 
1111     public String getScene() {
1212         return scene;
1313     }
1414 
1515     public void setScene(String scene) {
1616         this.scene = scene;
1717     }
1818 
1919     public String getPage() {
2020         return page;
2121     }
2222 
2323     public void setPage(String page) {
2424         this.page = page;
2525     }
2626 
2727     public int getWidth() {
2828         return width;
2929     }
3030 
3131     public void setWidth(int width) {
3232         this.width = width;
3333     }
3434 
3535     public Boolean getAuto_color() {
3636         return auto_color;
3737     }
3838 
3939     public void setAuto_color(Boolean auto_color) {
4040         this.auto_color = auto_color;
4141     }
4242 
4343     public Object getLine_color() {
4444         return line_color;
4545     }
4646 
4747     public void setLine_color(Object line_color) {
4848         this.line_color = line_color;
4949     }
5050 }

2.对URL进行Post请求

1 1 import org.apache.http.HttpResponse;
2 2 import org.apache.http.client.methods.HttpPost;
3 3 import org.apache.http.entity.StringEntity;
4 4 import org.apache.http.impl.client.CloseableHttpClient;
5 5 import org.apache.http.impl.client.HttpClientBuilder;
6 6 
7 7 public String getMiniProgramsQRCode(Integer restaurantId, String tableNumber, Integer tableNumberId) throws Exception {
8 8 
9 9         String accessToken = getMiniProgramsAccessToken();
1010 
1111         MiniProgramsCode miniProgramsCode = new MiniProgramsCode();
1212 
1313         String str = restaurantId.toString() + "*" + tableNumberId.toString() + "*" + tableNumber;
1414         miniProgramsCode.setScene(str);
1515         miniProgramsCode.setAuto_color(true);
1616         //设置颜色
1717         MiniProgramsCodeRgb miniProgramsCodeRgb = new MiniProgramsCodeRgb();
1818         miniProgramsCode.setLine_color(miniProgramsCodeRgb);
1919 
2020         CloseableHttpClient build = HttpClientBuilder.create().build();
2121         String postUrl = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + accessToken;
2222         HttpPost httpPost = new HttpPost(postUrl);
2323         httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json");
2424         String jsonStr = JSONObject.toJSONString(miniProgramsCode);
2525         StringEntity se = new StringEntity(jsonStr,"UTF-8");  // 中文乱码解决
2626         se.setContentType("text/json");
2727         se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
2828         httpPost.setEntity(se);
2929         HttpResponse httpResponse = build.execute(httpPost);
30
31　　　　　　if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {    　　　　　　　String result = EntityUtils.toString(httpResponse.getEntity());// 返回json格式：    　　　　　　 JSONObject response = JSON.parseObject(result);　　　　　　　　}
32
3330         InputStream inputStream = httpResponse.getEntity().getContent();   //返回流格式
3431         }