最开始乱码，用String接受的微信返回值，发现不能用字符串接受，用输入流转字节，再转base64传给前端
public String xyhkQrCode(HttpServletRequest request, HttpServletResponse response, String path, String scene) {
PKWXConfig pkwxConfig = new PKWXConfig();
String token = getToken(pkwxConfig.getStuAppID(), pkwxConfig.getStuKey());
return genQrCode(token,path,scene);
}
private String genQrCode(String token,String path,String scene){
String url = WechatUtil.WX_ACODE_UN_LIMIT.replace("ACCESS_TOKEN", token);
JSONObject paramJson=new JSONObject();
paramJson.put("page",path);
paramJson.put("scene",scene);
//返回值不能使用String接受
CloseableHttpClient httpClient = null;
CloseableHttpResponse httpResponse = null;
//创建httpClient连接对象
httpClient = HttpClients.createDefault();
//创建post请求连接对象
HttpPost httpPost = new HttpPost(url);
//创建连接请求对象,并设置连接参数
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(15000) //连接服务区主机超时时间
.setConnectionRequestTimeout(60000) //连接请求超时时间
.setSocketTimeout(60000).build(); //设置读取响应数据超时时间
//为httppost请求设置参数
httpPost.setConfig(requestConfig);
//将上传参数放到entity属性中
httpPost.setEntity(new StringEntity(JSON.toJSONString(paramJson), "UTF-8"));
//添加头信息
httpPost.addHeader("Content-type", "text/xml");
String result = "";
try {
//发送请求
httpResponse = httpClient.execute(httpPost);
//从相应对象中获取返回内容
HttpEntity entity = httpResponse.getEntity();
InputStream content = entity.getContent();
byte[] bytes = InputStreamToByte(content);
result = Base64.encodeBase64String(bytes);
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
/**
* 输入流转字节流
* */
private byte[] InputStreamToByte(InputStream in) throws IOException {
ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
byte[] buffer=new byte[1024];
int ch;
while ((ch = in.read(buffer)) != -1) {
bytestream.write(buffer,0,ch);
}
byte data[] = bytestream.toByteArray();
bytestream.close();
return data;
}
