java工具类------生成二维码

叁歲伎倆 2022-06-18 08:18 199阅读 0赞

开发中遇到了，所以整理一下，代码如下：

public String getQrcode(HttpServletRequest request) throws WriterException, IOException
        {
        		//生成二维码
     	         String text  = "集成到二维码中的内容，比如可以是url地址等";
     		int width = 1000;
     		int height = 1000;
     		Calendar date = Calendar.getInstance();
     		//二维码的图片格式
     		String format = "jpg";
     		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();
     		//内容所使用编码
     		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
     		BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
     		String saveUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/upload/";
          String savePath = request.getSession().getServletContext().getRealPath("");
          savePath = savePath + "/upload/";
          
                   // 建年的文件夹
       		int iYear = date.get(Calendar.YEAR);
       		savePath += File.separator + iYear;
       		saveUrl += "/" + iYear;
    
       		int iMonth = date.get(Calendar.MONTH) + 1;
       		savePath += File.separator + iMonth;
       		saveUrl += "/" + iMonth;
    
       		int iDay = date.get(Calendar.DATE);
       		savePath += File.separator + iDay+File.separator;
       		saveUrl += "/" + iDay+"/";
          savePath=savePath.replaceAll("\\\\", "/");
          File f1 = new File(savePath);
          System.out.println(savePath);
          if (!f1.exists()) {
              f1.mkdirs();
          }
          DiskFileItemFactory fac = new DiskFileItemFactory();
          ServletFileUpload upload = new ServletFileUpload(fac);
          upload.setHeaderEncoding("utf-8");
         
          String name ="qc"+communityOid+"-"+objectId;
        
          String extName = ".jpg";
          System.out.println(saveUrl + name + extName);
          String qrcode=saveUrl + name + extName;
          
          File saveFile = new File(savePath + name + extName);
       
          //生成二维码
          MatrixToImageWriter.writeToFile(bitMatrix, format, saveFile);
          return qrcode;
    	
       }

这只是个生成二维码的方法，小伙伴们可以根据自己的需要，灵活改变方法，来达到自己的需要，当然了生成成了二维码，也要创建二维码图片，存到本地的，具体方法如下：

public String creatfile(HttpServletRequest request){
        	Calendar date = Calendar.getInstance();
        	 String saveUrl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/upload/";
        	 String savePath = request.getSession().getServletContext()
                     .getRealPath("");
             savePath = savePath + "/upload/";
        	
        	 // 建年的文件夹
     	   		int iYear = date.get(Calendar.YEAR);
     	   	    savePath += File.separator + iYear;
     	   		saveUrl += "/" + iYear;
    
     	   		int iMonth = date.get(Calendar.MONTH) + 1;
     	   	    savePath += File.separator + iMonth;
     	   		saveUrl += "/" + iMonth;
    
     	   		int iDay = date.get(Calendar.DATE);
     	   	   savePath += File.separator + iDay+File.separator;
     	   		saveUrl += "/" + iDay+"/";
     	   		
     	   	 savePath=savePath.replaceAll("\\\\", "/");
     	      File f1 = new File(savePath);
     	      System.out.println(savePath);
     	      if (!f1.exists()) {
     	          f1.mkdirs();
     	      }
     	      DiskFileItemFactory fac = new DiskFileItemFactory();
     	      ServletFileUpload upload = new ServletFileUpload(fac);
     	      upload.setHeaderEncoding("utf-8");
     	      
     	   	 String name ="pi"+communityOid+"-"+objectId;//二维码图片的名字可以按自己规则制定
     	      String extName = ".jpg";
     	      System.out.println(saveUrl + name + extName);
     	      String postimg=saveUrl + name + extName;
     	      String pathpostimg=savePath + name + extName;
     	      return postimg+","+pathpostimg;
        }

在这里主要引入的jar文件，如下

zxing-3.2.1.jar  
zxing-core-2.2.jar

这个小伙伴们可以在网上找到，如果找不到可以给我留言！