package com.arvato.service.goods.api.config;

import net.sf.json.JSONObject;
import org.junit.jupiter.api.Test;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Random;

public class Demo {

@Testpublic void Text(){    String code=wxGetQrcode("appid","secret");    //生成access_token，直接将方法（wxGetQrcode()）生成的路径复制到浏览器访问生成access_token赋值到下方    String url="https://api.weixin.qq.com/wxa/getwxeunlimit?access_token=22_hhpjFnzxKY-MDLbepuY5-_eUlyuefhEvUdrHFZnqfV3QznzkxK7EMS03S4hJe0qe8-mAX2b3pypYzwxtqJJ-vW0jTKudDqw9F1LlpMPG2GAjzSFqG6t2o26QOMphpj9MhE1XcsldAQSycPUZEFMaACAVWD";    HashMapString, String params = new HashMap();    //scene:参数    params.put("scene", "id=2771");    //路径    params.put("page", "pages/goods/detail/index");    JSONObject json=JSONObject.fromObject(params);    String val = "";    Random random = new Random();    for (int i = 0; i  2; i++) {        val += String.valueOf(random.nextInt(10));    }    wxPost(url,json,val);}//1.获取ACCESS_TOKENpublic  String wxGetQrcode(String appid, String secret){    String getQrcode = "https://api.weixin.qq.ci-bin/token?grant_type=client_credential&appid="+ appid + "&secret=" + secret + "";    return getQrcode;}//第二步写入图片public  void wxPost(String uri, JSONObject paramJson, String fileName) {    try {        URL url = new URL(uri);        HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();        httpURLConnection.setRequestMethod("POST");// 提交模式        // conn.setConnectTimeout(10000);//连接超时 单位毫秒        // conn.setReadTimeout(2000);//读取超时 单位毫秒        // 发送POST请求必须设置如下两行        httpURLConnection.setDoOutput(true);        httpURLConnection.setDoInput(true);        // 获取URLConnection对象对应的输出流        PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());        printWriter.write(paramJson.toString());        // flush输出流的缓冲        printWriter.flush();        // 开始获取数据        BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());        System.out.println(bis);        File file=new File("d:/"+ fileName + ".png");// /Users/shenzhuan/logs/        OutputStream os = new FileOutputStream(file);        int len;        byte[] arr = new byte[1024];        while ((len = bis.read(arr)) != -1) {            os.write(arr, 0, len);            os.flush();        }        os.close();        bis.close();    } catch (Exception e) {        e.printStackTrace();    }}

}
当生成图片为1kb是，返回的是异常不是图片信息，删除。png后缀保存，找编译工具：idea或其他打开后可显示异常信息