【二维码】

一、普通二维码。代码实例（测试在service层）

@Override
	public boolean addQrcodefirst(WkrjQrcodefirst wkrjQrcodefirst, HttpServletRequest request) {
		String dept_id =wkrjQrcodefirst.getDept_id();
		String guid=Guid.getGuid();
		String realPath = request.getSession().getServletContext().getRealPath("/") + "/upload/qrcode/";
		String realPath1 = request.getSession().getServletContext().getRealPath("/");
		File file=new File(realPath);
		if(!file .exists()){
			file .mkdir();
		}
		String path="upload/qrcode/"+guid+".png";
		//String logorealPath = request.getSession().getServletContext().getRealPath("/") + "/system/imgs/logo11.png";//logo存放的位置
		String logorealPath ="";
		String encoderContent= request.getScheme() +"://" + request.getServerName()  + ":" +request.getServerPort()+request.getContextPath()+"/frontnew/indexfirst.jsp?qrcode_id="+wkrjQrcodefirst.getQrcodefirst_id();
		String imgPath=realPath+guid+".png";
		List<Map<String,Object>> list=InfomanageDao.getInfomanageBydeptid(dept_id);
		if(list.size()>0){
			Map<String, Object> map = list.get(0);
			if(!StringUtils.isEmpty(map)){
				String infomanage_firstUrl=map.get("infomanage_firstUrl")+"";
				if(!StringUtils.isEmpty(infomanage_firstUrl)){
					logorealPath=request.getSession().getServletContext().getRealPath("/")+infomanage_firstUrl;
				}
			}
		}
		try {
			QRCodeUtil.encode(encoderContent,logorealPath,imgPath, true);
		} catch (Exception e) {
			e.printStackTrace();
			return   false;
		}
		wkrjQrcodefirst.setQrcodefirst_url(path);
		return dao.addQrcodefirst(wkrjQrcodefirst);
	}

二、小程序二维码（批量生产）

1、工具类

package com.wkrj.qrcodeUtils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;

import javax.servlet.http.HttpServletRequest;

import net.sf.json.JSONObject;


public class XcxQRCode {
	
	
    /*
     * 获取 二维码图片
　　 * 
     */
    public static boolean getminiqrQr( String accessToken,HttpServletRequest request,String param
    		,String imgname,String path) {
    	String p=request.getSession().getServletContext().getRealPath("/");
    	String codeUrl=p+"/upload/qrcode/"+imgname;
    	//String twoCodeUrl=imgname;
    	 try
         {
             URL url = new URL("https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token="+accessToken);
             HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
             httpURLConnection.setRequestMethod("POST");// 提交模式
             // conn.setConnectTimeout(10000);//连接超时 单位毫秒
             // conn.setReadTimeout(2000);//读取超时 单位毫秒
             // 发送POST请求必须设置如下两行
             httpURLConnection.setDoOutput(true);
             httpURLConnection.setDoInput(true);
             // 获取URLConnection对象对应的输出流
             PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream());
             // 发送请求参数
             JSONObject paramJson = new JSONObject();
             paramJson.put("scene", param);
             paramJson.put("path", path);
             paramJson.put("width", 430);
             paramJson.put("is_hyaline", true);
             paramJson.put("auto_color", true);
             /**
              * line_color生效
              * paramJson.put("auto_color", false);
              * JSONObject lineColor = new JSONObject();
              * lineColor.put("r", 0);
              * lineColor.put("g", 0);
              * lineColor.put("b", 0);
              * paramJson.put("line_color", lineColor);
              * */
 
             printWriter.write(paramJson.toString());
             // flush输出流的缓冲
             printWriter.flush();
             //开始获取数据
             BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream());
             OutputStream os = new FileOutputStream(new File(codeUrl));
             int len;
             byte[] arr = new byte[1024];
             while ((len = bis.read(arr)) != -1)
             {
                 os.write(arr, 0, len);
                 os.flush();
             }
             os.close();
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }
		return true;
    }
   
    
}

2、调用方法

@RequestMapping("creatQrcodeByXcx")
	@ResponseBody
	public AjaxJson creatQrcodeByXcx(String dept_name,String id,HttpServletRequest request) throws IOException {
		AjaxJson json=new AjaxJson();
		//小程序
		String AppId ="wx*******************"; //小程序appid
	    String AppSecret ="*******************";//小程序秘钥
	    String param="dept_id="+id;//（组织机构）部门id
	    String imgname=id+".png";//生成的图片名称
	    String path="pages/index/index";//
		Token token = CommonUtil.getToken(AppId, AppSecret);//token
		String accessToken = token.getAccessToken();
		if(XcxQRCode.getminiqrQr(accessToken,request,param,imgname,path)){
			qrcodeService.delQrcodeFile(id);//删除原有的数据
			boolean c=qrcodeService.addQrcodeFile(id);//添加新的数据
			if(c){
				json.setSuccess(true);
				json.setMsg("二维码生成成功！");
			}
		}
		return json;
	}