java-简单二维码制作

main测试方法方法一

public static void main(String[] args) throws Exception {

final int width = 300;

final int height = 300;

final String format = "png";

final String content = "https://www.cnblogs.com/aston/p/7501895.html";

//定义二维码的参数

HashMap hints = new HashMap();

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);

hints.put(EncodeHintType.MARGIN, 2);

Path file =null;

//生成二维码

try {

//OutputStream stream = new OutputStreamWriter();

BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);

System.out.println(bitMatrix + " -----------------------------------------------------------------------------------------");

file = new File("F:/img.png").toPath();

MatrixToImageWriter.writeToPath(bitMatrix, format, file);

//MatrixToImageWriter.writeToStream(bitMatrix, format, stream);

} catch (Exception e) {

}

//return file;

}

实际案例方法二

所需jar包maven地址

<dependency>

<groupId>net.glxn.qrgen</groupId>

<artifactId>javase</artifactId>

<version>2.0</version>

</dependency>

//二维码制作方法

@Security(name = "二维码制作", asUrl = "downImage")

@RequestMapping("downImage/{id}")

public void play(ModelMap modelMap, @PathVariable Long id, HttpServletRequest request, HttpServletResponse response)throws Exception {

Video video = videoService.findById(id);

String domain = WebContext.getDomain();//获取域名

String path = domain+"/edu/manage/video/addPlay/"+id ;//视频播放地址

InputStream inputStream = img(path);

OutputStream outputStream= response.getOutputStream();

response.setHeader("Content-Disposition",//此方法是在浏览器直接下在图片，给浏览器返回一个文件，如果浏览器发现是一个文件就会自动下载

"attachment; filename=" + java.net.URLEncoder.encode(video.getName()+".png", "UTF-8"));

byte[] bytes=new byte[1024];

while ((inputStream.read(bytes))>0){

outputStream.write(bytes);

}

outputStream.flush();

outputStream.close();

}

public InputStream img(String content){

final int width = 300;

final int height = 300;

final String format = "png";

//final String content = "https://www.cnblogs.com/aston/p/7501895.html";

//定义二维码的参数

HashMap hints = new HashMap();

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);

hints.put(EncodeHintType.MARGIN, 2);

Path file =null;

//生成二维码

try {

//OutputStream stream = new OutputStreamWriter();

BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);

file = new File("F:/img.png").toPath();

MatrixToImageWriter.writeToPath(bitMatrix, format, file);

return new FileInputStream(file.toFile());

} catch (Exception e) {

}

return null;

}

下载图片例如下所示：

获取电脑磁盘盘符

File[] roots = File.listRoots();

File root = roots[0]; //获取磁盘的第一个盘符

System.out.println(root + " root ----------------------------------------");

for (int i =0; i < roots.length; i++) {

System.out.println(roots[i] + " ++++++++++++++++++++++++++++++");

}

手机微信扫描二维码提示跳转到浏览器里面

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8" />

<meta name="renderer" content="webkit" />

<meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />

<meta name="format-detection" content="telephone=no,email=no,date=no,address=no" />

<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />

<meta name="keywords" content="" />

<meta name="description" content="" />

<meta name="author" content="Mr Shen,sgq625@126.com" />

<meta name="revised" content="Mr Shen,2019-03-15 10:20:30" />

<meta name="generator" content="HBuilder 9.1.29" />

<title>shiping</title>

<link href="https://cdn.bootcss.com/weui/1.1.3/style/weui.min.css" rel="stylesheet">

<link href="https://cdn.bootcss.com/jquery-weui/1.2.1/css/jquery-weui.min.css" rel="stylesheet">

<link rel="stylesheet" href="https://g.alicdn.com/de/prismplayer/1.9.2/skins/default/index.css"/>

<script type="text/javascript" src="https://g.alicdn.com/de/prismplayer/1.9.2/prism.js"></script>

<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>

<script src="https://cdn.bootcss.com/jquery-weui/1.2.1/js/jquery-weui.min.js"></script>

<style type="text/css">

body{

min-width: 320px;

max-width: 640px;

margin: 0 auto;

}

.weui-panel__hd{

color: #333;

font-size: 18px;

padding-top: 0;

}

.weui-cells:after,

.weui-cells:before,

.weui-cell:after,

.weui-cell:before {

display: none;

}

.weui-panel:after,

.weui-panel:before{

display: none;

}

</style>

</head>

<body>

<div class="" style="max-width: 640px;min-width: 320px;width: 100%;height: auto;margin-top: 20px">

<div id="" style="line-height: 24px;text-align: center; margin-bottom: 15px; font-size: 20px">

${(video.name)!}

</div>

<div id="J_prismPlayer" style="max-width: 640px;min-width: 320px;width: 100%; height: auto;margin: 0 auto;" controls>

</div>

<div class="weui-panel weui-panel_access">

<div class="weui-panel__hd">相关视频推荐</div>

<div class="weui-panel__bd" id="J-call-app">

<#list videoList as video>

<#--<a href="${contextPath}/video/play/${video.id};" class="weui-media-box weui-media-box_appmsg">-->

<div class="weui-media-box__hd">

<img style="width: 60px; height: 60px" src="${(video.imagePath)!}">

</div>

<div class="weui-media-box__bd">

<h4 class="weui-media-box__title">${(video.name)!}</h4>

<p class="weui-media-box__desc">${(video.description)!}</p>

</div>

</a>

</#list>

</div>

<#--下载app地址-->

<input id="J-download-app" type="hidden" name="storeurl" value="http://m.chanyouji.cn/apk/chanyouji-2.2.0.apk">

<script>

var player = new prismplayer({//视频播放插件

id: "J_prismPlayer",

autoplay: true,

width: "auto",

//height: "auto",

vid: "${(video.videoId)!}",

playauth: "${(playAuth)!}",

});

$("#J_prismPlayer").find("video").each(function(i){

$(this).attr({"controls":"controls","loop":"loop"});

}); //视频添加全屏进度条声音及自动播放等控件

$(".prism-controlbar").hide(); //去掉时间重复

$("#J_prismPlayer").click(function () {

$(".prism-controlbar").hide();

})//避免点击视频时出现两个时间

$("video").trigger("play");//for auto play

$("video").addClass('pause');//for check pause or play add a class

$('video').click(function() {

if ($(this).hasClass('pause')) {

$("video").trigger("play");

$(this).removeClass('pause');

$(this).addClass('play');

} else {

$("video").trigger("pause");

$(this).removeClass('play');

$(this).addClass('pause');

}

})//添加点击视频就能播放暂停

$("#J-call-app").click(function () {

adds();

});

function adds(){

var ua = navigator.userAgent.toLowerCase(); //识别用户的客户端，可以判断是什么软件

var t;

var config = {

/*scheme:必须*/

scheme_IOS: 'cundong://', //苹果

scheme_Adr: 'cundong://splash', //安卓

download_url: document.getElementById('J-download-app').value, //下载地址

timeout: 600

};

openclient();

function openclient() {

var startTime = Date.now();

var ifr = document.createElement('iframe');

ifr.src = ua.indexOf('os') > 0 ? config.scheme_IOS : config.scheme_Adr;

ifr.style.display = 'none';

document.body.appendChild(ifr);

var t = setTimeout(function() {

var endTime = Date.now();

if ( endTime - startTime< (config.timeout + 200)) {

if(ua.match(/MicroMessenger/i)=="micromessenger"){ //判断是否是微信中扫描的二维码

alert("请点击右上角 ... 按钮选择在浏览器打开");

return;

}

if(ua.indexOf('os') > 0){//大于0是苹果端

alert("苹果")

}

if(ua.indexOf('os') < 0){//小于0是安卓端 -1

alert("安卓");

}

window.location = config.download_url; //在浏览器中直接下载

}

}, config.timeout);

}

window.addEventListener("DOMContentLoaded", function(){

document.getElementById("J-call-app").addEventListener('click',openclient,false);

}, false);

}

</script>

</body>

</html>

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