如何生成微信小程序碼(獲取微信小程序碼)
發表時(shí)間:2020-10-23
發布人(rén):融晨科技
浏覽次數:67
前言
在(zài)微信小程序的(de)某些業務場景中,需要(yào / yāo)用戶微信掃碼後直接進入到(dào)小程序的(de)某個(gè)頁面(有時(shí)小程序碼還需攜帶一些參數),在(zài)這(zhè)種場景下,就(jiù)需要(yào / yāo)生成小程序碼。
流程
1、獲取小程序接口調用憑證(accesstoken)
2、獲取小程序二維碼(獲取成功後,微信服務端将返回二進制字節流,因此需要(yào / yāo)創建一個(gè)文件保存圖片)
代碼案例
1、引入fastjson依賴
<!-- json -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.1.41</version>
</dependency>
2、Java代碼示例
import com.alibaba.fastjson.JSONObject;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
/**
* @description 獲取小程序二維碼
* @author: liyinlong
* @date 2020/10/23 10:11
*/
public class GetMiniQrcode {
public static void main(String[] args) {
String appid = "";
String secret = "";
String token = getAccessToken(appid, secret);
//發送json請求,對象必須封裝成json格式
JSONObject params = new JSONObject();
params.put("scene","xiaozhugedeboke");//參數
params.put("page","pages/verifycode/verifycode");
//注意!一定要(yào / yāo)将對象轉成字符串
String param = params.toJSONString();
String file = "e://a.png";
getQrCode("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + token, param, file);
}
/**
* @param url 發送請求的(de)URL
* @param param 請求參數
* @return 所代表遠程資源的(de)響應結果
* @description 向指定 URL 發送POST方法的(de)請求
* @author: liyinlong
* @date 2020-01-05 21:00
*/
public static String getQrCode(String url, String param,String file) {
System.out.println("\n==============================POST請求開始==============================");
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打開和(hé / huò)URL之(zhī)間的(de)連接
URLConnection conn = realUrl.openConnection();
// 設置通用的(de)請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
//設置Content-type 爲(wéi / wèi) application/json
conn.addRequestProperty("Content-type", "application/json");
// 發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
// 獲取URLConnection對象對應的(de)輸出(chū)流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(param);
// flush輸出(chū)流的(de)緩沖
out.flush();
// 定義BufferedReader輸入流來(lái)讀取URL的(de)響應
InputStream inputStream = conn.getInputStream();
FileOutputStream outputStream = new FileOutputStream(file);
int len = 0;
byte[] buf = new byte[1024];
while ((len = inputStream.read(buf, 0, 1024)) != -1) {
outputStream.write(buf, 0, len);
}
outputStream.flush();
outputStream.close();
} catch (Exception e) {
System.out.println("發送 POST 請求出(chū)現異常!" + e);
e.printStackTrace();
}
//使用finally塊來(lái)關閉輸出(chū)流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
System.out.println("url:" + url);
System.out.println("POST請求結果:" + result);
System.out.println("==============================POST請求結束==============================\n");
return result;
}
/**
* @author: liyinlong
* @description 獲取小程序接口調用憑證
* 官方文檔: https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/access-token/auth.getAccessToken.html
* 接口調用url https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET
* @date 2020/10/23 10:31
* @param appid 小程序appid
* @param appsecert 小程序密鑰
* @return 小程序接口調用憑證accesstoken
*/
public static String getAccessToken(String appid,String appsecert) {
System.out.println("\n==============================GET請求開始==============================");
String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appid
+ "&secret=" + appsecert;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打開和(hé / huò)URL之(zhī)間的(de)連接
URLConnection conn = realUrl.openConnection();
// 設置通用的(de)請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
//設置Content-type 爲(wéi / wèi) application/json
conn.addRequestProperty("Content-type", "application/json");
// 發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("發送 GET 請求出(chū)現異常!" + e);
e.printStackTrace();
}
//使用finally塊來(lái)關閉輸出(chū)流、輸入流
finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
System.out.println("url:" + url);
System.out.println("GET請求結果:" + result);
JSONObject res = JSONObject.parseObject(result);
System.out.println("==============================GET請求結束==============================\n");
return res.getString("access_token");
}
}