java 二維碼名片流文件下載

感謝同事幫忙，這個主要是生成二維碼名片，然後點擊下載鏈接進行下載。

這是中文版

public void genChineseQrCode(){
		StringBuffer content = new StringBuffer();
		if(sysUser.getId() != null){
			SysUser user = sysUserBusiness.findById(sysUser.getId());
			content.append("BEGIN:VCARD\n" +
						   "VERSION:3.0\n");
			if(user.getName() != null){
				String name = user.getName();
				content.append("FN:"+ name.substring(1,name.length())+" "+ name.charAt(0) +"\n" +
					       	   "N:"+  name.charAt(0)+";"+ name.substring(1,name.length()) +"\n");
			}
			if(user.getChCardPositionName() != null){
				content.append("TITLE: " + user.getChCardPositionName()+"\n");
			}
			if(user.getMobile() != null){
		    	String mobile = user.getMobile();
		    	content.append("TEL;CELL:+86 " +mobile.substring(0, 3)+ " " + mobile.substring(3, 7) +" "+ mobile.substring(7, 11) +"\n");
		    }
			content.append("TEL;WORK;VOICE:[phone]\n");
			content.append("TEL;WORK;FAX:[phone]\n");
			if(user.getEmail() != null){
				content.append("EMAIL;WORK;INTERNET:"+ user.getEmail() +"\n");
			}
			content.append("URL:http://www.baidu.com\n" +
						   "ORG:百度有限公司\n" +
						   "END:VCARD");
		    this.getQrCode(content.toString(),user.getName(),"ch");
		}
	}

這是英文版

public void genEnglishQrCode(){
		StringBuffer content = new StringBuffer();
		if(sysUser.getId() != null){
			SysUser user = sysUserBusiness.findById(sysUser.getId());
			content.append("BEGIN:VCARD\n" +
		    		  	   "VERSION:3.0\n") ;
			if(user.getEnName() != null){
				String enName = user.getEnName();
				content.append("FN:"+ enName.substring(0, enName.lastIndexOf("."))+ " " + enName.substring(enName.lastIndexOf(".") + 1, enName.length()) +"\n" +
							   "N:"+ enName.substring(enName.lastIndexOf(".") + 1, enName.length()) + ";" +enName.substring(0, enName.lastIndexOf(".")) +"\n") ;
			}
			if(user.getEnCardPositionName() != null){
				content.append("TITLE:" + user.getEnCardPositionName()+"\n");
			}
		    if(user.getMobile() != null){
		    	String mobile = user.getMobile();
		    	content.append("TEL;CELL:+86 " +mobile.substring(0, 3)+ " " + mobile.substring(3, 7) +" "+ mobile.substring(7, 11) +"\n");
		    }
		    content.append("TEL;WORK;VOICE:[phone]\n");
		    content.append("TEL;WORK;FAX:[phone]\n");
		    if(user.getEmail() != null){
		    	content.append("EMAIL;WORK;INTERNET:"+user.getEmail()+"\n");
		    }
		    content.append("URL:http://www.baidu.com\n" +
		    		   	   "ORG:BAIDU ELECTRONIC TECHNOLOGY CO.,LTD.\n" +
		    		       "END:VCARD");
		    this.getQrCode(content.toString(),user.getName(),"en");
		}
	}

這是生成二維碼圖片代碼

public void getQrCode(String content,String name,String tag){
		BufferedImage bufImg = null;
        try {
        	Qrcode qrcodeHandler = new Qrcode();  
        	// 設置二維碼排錯率，可選L(7%)、M(15%)、Q(25%)、H(30%)，排錯率越高可存儲的信息越少，但對二維碼清晰度的要求越小  
	        qrcodeHandler.setQrcodeErrorCorrect('M');  
	        qrcodeHandler.setQrcodeEncodeMode('B');  
	        // 設置設置二維碼尺寸，取值範圍1-40，值越大尺寸越大，可存儲的信息越大  
	        qrcodeHandler.setQrcodeVersion(13);
	        // 獲得內容的字節數組，設置編碼格式  
	        byte[] contentBytes  = content.getBytes("utf-8");
	        // 圖片尺寸  
	        int imgSize = 67 + 12 * (13 - 1);
	        bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);  
	        Graphics2D gs = bufImg.createGraphics();
	        // 設置背景顏色  
	        gs.setBackground(Color.WHITE);
	        gs.clearRect(0, 0, imgSize, imgSize);  
	 
	        // 設定圖像顏色> BLACK  
	        gs.setColor(Color.BLACK);  
	        // 設置偏移量，不設置可能導致解析出錯  
	        int pixoff = 2;  
	        // 輸出內容> 二維碼  
	        if (contentBytes.length > 0 && contentBytes.length < 800) {
	            boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);  
	              for (int i = 0; i < codeOut.length; i++) {  
	                  for (int j = 0; j < codeOut.length; j++) {  
	                      if (codeOut[j][i]) {  
	                          gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
	                      }
	                  }
	              } 
	        } else {
	        	throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
	        }  
	        gs.dispose();  
	        bufImg.flush();
	        OutputStream os = getResponse().getOutputStream();
			ImageIO.write(bufImg, "png", os);
			File file = null;
			if(tag == "en"){
				file = new File(name + "英文版.png");
			}else{
				file = new File(name + "中文版.png");
			}
			ImageIO.write(bufImg, "png", file);
			getRequest().getSession().setAttribute("file", file);
	      } catch (Exception e) {  
	          e.printStackTrace();  
	      }  
	}

這是下載代碼，具有彈出框功能

/**
	 * 二維碼下載
	 */
	@SuppressWarnings("static-access")
	public void download() throws UnsupportedEncodingException{
		File file = (File)getRequest().getSession().getAttribute("file");
		try {
			new Download().download(getRequest(), getResponse(), file);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

這是在DownLoad()類裏面

public static void download(HttpServletRequest req, HttpServletResponse resp, File file) throws IOException {
		resp.setContentType("application/x-msdownload");
		resp.setHeader("Content-Disposition", "attachment; filename="+ new String(file.getName().getBytes("GBK"),"ISO-8859-1"));
        int fileLength = (int) file.length();
        resp.setContentLength(fileLength);
        if (fileLength != 0) {
            InputStream ins;
			try {
				ins = new FileInputStream(file);
				byte[] buf = new byte[4096];
				ServletOutputStream sos;
				try {
					sos = resp.getOutputStream();
					int readLength;
					while (((readLength = ins.read(buf)) != -1)) {
						sos.write(buf, 0, readLength);
					}
					ins.close();
					sos.flush();
					sos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			} catch (FileNotFoundException e) {
				e.printStackTrace();
			}
        }
	}