java微信小程序参数二维码生成带背景图加字体(无限生成)
需求 ：
1，因为项目需求 ，生成数以万计的二维码
2 ，每个二维码带不同的参数
3，二维码有固定背景图
4 ， 往生成图片上写入 字体和编号(动态 )
设计技术 ：
1，微信接口token ，nginx 缓存
2，二维码 图片定义 写字
maven
<dependency>
<groupId>com.twelvemonkeys.imageio</groupId>
<artifactId>imageio-jpeg</artifactId>
<version>3.0-rc5</version>
</dependency>
还有rt.jar 在你java安装文件的bin里面
获取token信息
public void GetUrl() throws ClientProtocolException,
IOException {
HttpGet httpGet = new HttpGet(
"https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
+ Configure.getAppID() + "&secret="
+ Configure.getSecret() );
HttpClient httpClient = HttpClients.createDefault();
HttpResponse res = httpClient.execute(httpGet);
HttpEntity entity = res.getEntity();
String result = EntityUtils.toString(entity, "UTF-8");
JSONObject jsons = JSONObject.fromObject(result);
String expires_in = jsons.getString("expires_in");
//缓存
if(Integer.parseInt(expires_in)==7200){
//ok
String access_token = jsons.getString("access_token");
Jedis cache = new Jedis("127.0.0.1", 6379);
System.out.println("access_token:"+access_token);
Pipeline pipeline = cache.pipelined();
pipeline.set("access_token", access_token);
pipeline.expire("access_token", 7200);
pipeline.sync();
}else{
System.out.println("出错获取token失败！");
}
}
获取二维码 信息图片
public String GetPostUrl(String access_token,String id) throws Exception { //String result = HttpRequest.sendPost("http://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+access_token, path); System.out.println(id); String url ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token="; Map<String, Object> map = new HashMap<String, Object>(); map.put("path", "pages/index/index?###="+id);//你二维码中跳向的地址 map.put("width", "430");//图片大小 JSONObject json = JSONObject.fromObject(map); System.out.println(json); String res= HttpClientConnectionManager.httpPostWithJSON(url + access_token, json.toString(),id); System.out.println(res); return null; }
返回图片保存 ，根据 id
public static String httpPostWithJSON(String url, String json,String id) 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); // httpClient.execute(httpPost); HttpResponse response = httpClient.execute(httpPost); if (response != null) { HttpEntity resEntity = response.getEntity(); if (resEntity != null) { InputStream instreams = resEntity.getContent(); String uploadSysUrl = "D://erweima/"; File saveFile = new File(uploadSysUrl+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, uploadSysUrl, 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 */ public 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; }
然后是图片重合和增加字体
public void changeImage(String imageurl,String i ){ try { // InputStream imagein = new FileInputStream( // "D:/systemAvatarNew1.png"); // InputStream imagein2 = new FileInputStream( // "D:/qqfile/1852230493/FileRecv/4-02.png"); InputStream imagein = new FileInputStream( "D:/systemAvatarNew1.png"); InputStream imagein2 = new FileInputStream( imageurl); BufferedImage image = ImageIO.read(imagein); BufferedImage image2 = ImageIO.read(imagein2); //image2.getWidth() - 160, image2.getHeight() - 155, Graphics g = image.getGraphics(); g.drawImage(image2, 300, 230, 410,422,null); // g.drawImage(image2, image.getWidth() - image2.getWidth() - 195, // image.getHeight() - image2.getHeight() - 190, // 340,349,null); OutputStream outImage = new FileOutputStream( imageurl); JPEGImageEncoder enc = JPEGCodec.createJPEGEncoder(outImage); enc.encode(image); BufferedImage bimg=ImageIO.read(new FileInputStream(imageurl)); //得到Graphics2D 对象 Graphics2D g2d=(Graphics2D)bimg.getGraphics(); //设置颜色和画笔粗细 g2d.setColor(Color.black); g2d.setStroke(new BasicStroke(5)); //String pathString = "D://qqfile/1852230493/FileRecv/SourceHanSansCN-/SourceHanSansCN-Heavy.otf"; // Font dynamicFont = Font.createFont(Font.TRUETYPE_FONT, new File(pathString)); g2d.setFont(new Font("微软雅黑", Font.PLAIN, 36)); //g2d.setFont(Loadfont.loadFont(pathString, 45)); //绘制图案或文字 g2d.drawString("编号: "+i, 320, 700); // g2d.drawString(i, 450, 700); ImageIO.write(bimg, "JPG",new FileOutputStream(imageurl)); File fromFile = new File(imageurl); File toFile = new File(imageurl); Image1 Image1 =new Image1(); Image1.resizePng(fromFile, toFile, 1000, 1000, false); imagein.close(); imagein2.close(); outImage.close(); } catch (Exception e) { e.printStackTrace(); } }
接下来再 main方法里面跑一下 就ok ，如果是需要返回前台信息的，就直接记录地址，前台显示就可以了
需要源码的可以加qq1852230493
