前端部分(Vue + Vant)
- 引入Vant、使用Vant中的Uploader组件上传文件(支持手机拍照)
1
2
3
|
import Vue from 'vue' import { Uploader } from 'vant' Vue.use(Uploader); |
- 使用Uploader上传组件
1
2
3
4
5
|
< van-uploader > < van-button icon = "plus" type = "primary" :after-read = "afterRead" > 上传文件(识别条码) </ van-button > </ van-uploader > |
-
js部分、文件上传完毕后会触发
after-read
回调函数,获取到对应的file
对象。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
afterRead(file) { var self = this ; //调用上传回调函数 - upload this .upLoad( this .$baseUrl + "upload/uploadParsing" , file, function (response) { if ( response.msg.length >0){ console.log(response.msg) } else { Toast.fail( '识别失败,请重新上传条码!' ,3500) } }); }, upLoad(url, file, func) { var fileBase64 = '' // 创建Canvas对象(画布) debugger let canvas = document.createElement( "canvas" ); // 获取对应的CanvasRenderingContext2D对象(画笔) let context = canvas.getContext( "2d" ); // 创建新的图片对象 let img = new Image(); // 指定图片的DataURL(图片的base64编码数据) img.src = file.content; // 监听浏览器加载图片完成,然后进行进行绘制 img.onload = () => { // 指定canvas画布大小,该大小为最后生成图片的大小 canvas.width = 400; canvas.height = 300; /* drawImage画布绘制的方法。(0,0)表示以Canvas画布左上角为起点,400,300是将图片按给定的像素进行缩小。 如果不指定缩小的像素图片将以图片原始大小进行绘制,图片像素如果大于画布将会从左上角开始按画布大小部分绘制图片,最后的图片就是张局部图。*/ context.drawImage(img, 0, 0, 400, 300); // 将绘制完成的图片重新转化为base64编码,file.file.type为图片类型,0.92为默认压缩质量 file.content = canvas.toDataURL(file.file.type, 0.92); fileBase64 = file.content // 最后将base64编码的图片保存到数组中,留待上传。43 console.log(fileBase64) //查询字典值 this .$axios.post(url,{ 'fileBase64Code' :fileBase64}) .then( function (response) { func(response.data); }.bind( this )) . catch ( function (error) { Toast.file( "识别失败,请重新上传条码!" ,3500); }) }; }, |
后端部分(Java )
添加 zxing + base64 依赖
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
<!-- 解析二维码 --> < dependency > < groupId >com.google.zxing</ groupId > < artifactId >core</ artifactId > < version >3.3.3</ version > </ dependency > < dependency > < groupId >com.google.zxing</ groupId > < artifactId >javase</ artifactId > < version >3.3.3</ version > </ dependency > <!-- Base64 --> <!-- https://mvnrepository.com/artifact/net.iharder/base64 --> < dependency > < groupId >net.iharder</ groupId > < artifactId >base64</ artifactId > < version >2.3.8</ version > </ dependency > |
Controller
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
@ResponseBody @RequestMapping (value = "/uploadParsing" , method = RequestMethod.POST) public ResponseMessage uploadParsing( @RequestBody imgUploadMessage uploadFile){ ResponseMessage rm= new ResponseMessage(); //解析Base64编码之后 读取条 try { String imgStr = uploadFile.getFileBase64Code().substring(uploadFile.getFileBase64Code().indexOf( "," )+ 1 ); Decoder decoder = Base64.getDecoder(); byte [] base = decoder.decode(imgStr); for ( int i = 0 ; i < base.length; ++i) { if (base[i] < 0 ) { base[i] += 256 ; } } ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(base); BufferedImage read = ImageIO.read( byteArrayInputStream); if ( null ==read) { rm.setMsg( "解析失败" ); rm.setSuccess( false ); return rm; } BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(read); BinaryBitmap bitmap = new BinaryBitmap( new HybridBinarizer(source)); Map<DecodeHintType,Object> hints= new HashMap<>(); hints.put(DecodeHintType.CHARACTER_SET, "GBK" ); hints.put(DecodeHintType.PURE_BARCODE,Boolean.TRUE); hints.put(DecodeHintType.TRY_HARDER,Boolean.TRUE); Result decode = new MultiFormatReader().decode(bitmap, hints); log.debug( "条形码的内容是:" + decode.getText()); rm.setMsg(decode.getText()); } catch (Exception e) { e.printStackTrace(); log.debug( "解析失败:" ,e); rm.setSuccess( false ); rm.setMsg( "解析失败" ); } return rm; } |
以上就是Vue+Java+Base64实现条码解析的示例的详细内容,更多关于Vue+Java+Base64实现条码解析的资料请关注服务器之家其它相关文章!
原文链接:https://www.cnblogs.com/bingziweb/p/13713505.html