微信小程序java参数二维码生成带背景图加字体

Jory
Jory

发布于 2017-07-11 10:18

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java微信小程序参数二维码生成带背景图加字体开发教程:


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


com.twelvemonkeys.imageio 
imageio-jpeg 
3.0-rc5 

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

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