具体文档可以看这里：获取携带参数的小程序码
第一步：获取ACCESS_TOKEN
//获取token的接口地址 public final static String access_token_url = "https://api.weixin.qq.com/cgi-bin/token?" + "grant_type=client_credential&appid=APPID&secret=APPSECRET"; /** * 获取access_token * * @param appid * @param appsecret * @return */ public String getAccess_token(String appid, String appsecret) { try { String requestUrl = access_token_url.replace("APPID", appid).replace("APPSECRET", appsecret); JSONObject jsonObject = httpRequst(requestUrl, "GET", null); return jsonObject.getString("access_token"); } catch (Exception e) { return "errer"; } }/** * * @Title: httpsRequest * @Description: 发送请求,返回JSONObject对象 * @param requestUrl * @param requestMethod * @param outputStr * @return * @throws Exception */ public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) throws Exception { JSONObject jsonObject = null; try { // 使用自定义的信任管理器 TrustManager[] tm = { new X509TrustManager() { /** * 检查客户端证书 */ @Override public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException { } /** * 检查服务器端证书 */ @Override public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException { } /** * 返回受信任的X509证书数组 */ @Override public X509Certificate[] getAcceptedIssuers() { return null; } } }; SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE"); sslContext.init(null, tm, new java.security.SecureRandom()); SSLSocketFactory ssf = sslContext.getSocketFactory(); // 建立连接 URL url = new URL(requestUrl); HttpsURLConnection conn = (HttpsURLConnection) url.openConnection(); conn.setSSLSocketFactory(ssf); conn.setDoOutput(true); conn.setDoInput(true); // 设置请求方式 conn.setRequestMethod(requestMethod); // 当outputStr不为null时,向输出流写数据 if (null != outputStr) { OutputStream outputStream = conn.getOutputStream(); outputStream.write(outputStr.getBytes("UTF-8")); outputStream.close(); } // 获取输入流 InputStream inputStream = conn.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8"); BufferedReader bufferedReader = new BufferedReader(inputStreamReader); // 读取响应内容 StringBuffer buffer = new StringBuffer(); String str = null; while ((str = bufferedReader.readLine()) != null) { buffer.append(str); } // 关闭资源 bufferedReader.close(); inputStreamReader.close(); inputStream.close(); conn.disconnect(); jsonObject = JSONObject.fromObject(buffer.toString()); } catch (Exception e) { throw new Exception("请求/解析失败"); } return jsonObject; }第二步：生成小程序二维码工具类
import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicHeader;import org.apache.http.protocol.HTTP;/** * * @ClassName: CreateImgUtil * @Description: 生成小程序二维码工具类 * @author cheng * @date 2017年9月13日 上午10:34:59 */@SuppressWarnings("deprecation")public class CreateImgUtil { /** * 私有化构造函数，防止创建本工具类的实例 */ private CreateImgUtil() { } @SuppressWarnings({ "resource" }) public static String httpPostWithJSON(String url, String json, String id,String dir) throws Exception { String result = null; DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(url); httpPost.addHeader(HTTP.CONTENT_TYPE, "application/json"); StringEntity se = new StringEntity(json); se.setContentType("application/json"); se.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE, "UTF-8")); httpPost.setEntity(se); HttpResponse response = httpClient.execute(httpPost); if (response != null) { HttpEntity resEntity = response.getEntity(); if (resEntity != null) { InputStream instreams = resEntity.getContent(); File saveFile = new File(dir + id + ".png"); // 判断这个文件（saveFile）是否存在 if (!saveFile.getParentFile().exists()) { // 如果不存在就创建这个文件夹 saveFile.getParentFile().mkdirs(); } saveToImgByInputStream(instreams, dir, id + ".png"); } } httpPost.abort(); return result; } /* * @param instreams 二进制流 * * @param imgPath 图片的保存路径 * * @param imgName 图片的名称 * * @return 1：保存正常 0：保存失败 */ private static int saveToImgByInputStream(InputStream instreams, String imgPath, String imgName) { int stateInt = 1; if (instreams != null) { try { File file = new File(imgPath + imgName);// 可以是任何图片格式.jpg,.png等 FileOutputStream fos = new FileOutputStream(file); byte[] b = new byte[1024]; int nRead = 0; while ((nRead = instreams.read(b)) != -1) { fos.write(b, 0, nRead); } fos.flush(); fos.close(); } catch (Exception e) { stateInt = 0; e.printStackTrace(); } finally { try { instreams.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } return stateInt; }}第三步：生成携带参数的小程序码
// 依据公司信息生成个性化小程序码,返回小程序码名称 private String createImgByCompanyId(String companyId,String dir) { // 获取token String appid = "wx8b3f3454sdfsdfsdgdfgdf4tr3402c2d7728"; String appsecret = "c35b5a0b94ea1ece9c0rwerwerwer34wetwetre390468b3efed7"; String token = getAccess_token(appid, appsecret); // 生成小程序码接口url String url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=ACCESS_TOKEN".replace("ACCESS_TOKEN", token); // 二维码中信息 MapString, Object map = new HashMapString, Object(); map.put("path", "pages/index/index");// 你二维码中跳向的页面 map.put("scene", companyId);// 携带参数 String json = JSONUtils.toJSONString(map); // 生成二维码 try { CreateImgUtil.httpPostWithJSON(url, json, companyId,dir); return companyId; } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; }
