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 = ;
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[];
int nRead = ;
while ((nRead = instreams.read(b)) != -) {
fos.write(b, , nRead);
}
fos.flush();
fos.close();
} catch (Exception e) {
stateInt = ;
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
Map<String, Object> map = new HashMap<String, 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;
}
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