需求：老婆工作需要，要做一个粘贴或上传图片后，能自动识别图片中的文字和数字以及英文的功能。
思考及调研：查阅了一些相关资料，发现很多大的厂商（百度、阿里、腾讯等）已有相关的开放接口供应，可满足不同客户需要。主要就是OCR功能，不了解的可以自行度娘。
话不多说，开始编码。（因该功能我是集成到了自己的一个自有项目中，不便贴完整，所以本文贴的代码都为主体代码，是完全可以实现的。）
一、前端页面
使用的是百度的webuploader，可直接截图粘贴，可拖拽式上传
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<title>文字识别</title>
<link rel="shortcut icon" href="favicon.ico"/>
<link href="/css/bootstrap.min.css?v=3.3.6" rel="stylesheet"/>
<link href="/css/font-awesome.css?v=4.4.0" rel="stylesheet"/>
<link href="/css/animate.css" rel="stylesheet"/>
<link href="/css/style.css?v=4.1.0" rel="stylesheet"/>
<link rel="stylesheet" type="text/css" href="/css/plugins/webuploader/webuploader.css"/>
<link rel="stylesheet" type="text/css" href="/css/demo/webuploader-demo.css"/>
</head>
<body class="gray-bg">
<div class="wrapper wrapper-content animated fadeInRight">
<div class="row">
<div class="ibox">
<div class="ibox-title">
<h5>图片上传</h5>
</div>
<div class="ibox-content">
<div class="row row-lg">
<div class="alert alert-success" id="ocrResult">
<p> 您可以尝试文件拖拽，使用QQ截屏工具，然后激活窗口后粘贴，或者点击添加图片按钮，来上传图片。</p>
</div>
<div id="uploader" class="wu-example">
<div class="queueList">
<div id="dndArea" class="placeholder">
<div id="filePicker"></div>
<p>将照片拖到这里，一次只可上传一张。</p>
</div>
</div>
<div class="statusBar" style="display:none;">
<div class="progress">
<span class="text">0%</span>
<span class="percentage"></span>
</div><div class="info"></div>
<div class="btns">
<div id="filePicker2"></div><div class="uploadBtn">开始上传</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="row">
<div class="ibox">
<div class="ibox-title">
<h5>转换结果</h5>
</div>
<div class="ibox-content">
<div class="row row-lg">
<div class="col-sm-12">
<div class="alert alert-info">
<p id="orcResult">...</p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- 全局js -->
<script src="/js/jquery.min.js?v=2.1.4"></script>
<script src="/js/bootstrap.min.js?v=3.3.6"></script>
<!-- 自定义js -->
<script src="/js/content.js?v=1.0.0"></script>
<script type="text/javascript">
// 添加全局站点信息
var BASE_URL = '/js/plugins/webuploader';
</script>
<script src="/js/plugins/webuploader/webuploader.min.js"></script>
<script src="/js/webuploader/webuploader-demo.js"></script>
</body>
</html>
webuploader-demo.js
jQuery(function() {
var $ = jQuery, // just in case. Make sure it's not an other libaray.
$wrap = $('#uploader'),
// 图片容器
$queue = $('<ul class="filelist"></ul>')
.appendTo( $wrap.find('.queueList') ),
// 状态栏，包括进度和控制按钮
$statusBar = $wrap.find('.statusBar'),
// 文件总体选择信息。
$info = $statusBar.find('.info'),
// 上传按钮
$upload = $wrap.find('.uploadBtn'),
// 没选择文件之前的内容。
$placeHolder = $wrap.find('.placeholder'),
// 总体进度条
$progress = $statusBar.find('.progress').hide(),
// 添加的文件数量
fileCount = 0,
// 添加的文件总大小
fileSize = 0,
// 优化retina, 在retina下这个值是2
ratio = window.devicePixelRatio || 1,
// 缩略图大小
thumbnailWidth = 110 * ratio,
thumbnailHeight = 110 * ratio,
// 可能有pedding, ready, uploading, confirm, done.
state = 'pedding',
// 所有文件的进度信息，key为file id
percentages = {},
supportTransition = (function(){
var s = document.createElement('p').style,
r = 'transition' in s ||
'WebkitTransition' in s ||
'MozTransition' in s ||
'msTransition' in s ||
'OTransition' in s;
s = null;
return r;
})(),
// WebUploader实例
uploader;
if ( !WebUploader.Uploader.support() ) {
alert( 'Web Uploader 不支持您的浏览器！如果你使用的是IE浏览器，请尝试升级 flash 播放器');
throw new Error( 'WebUploader does not support the browser you are using.' );
}
// 实例化
uploader = WebUploader.create({
pick: {
id: '#filePicker',
label: '点击选择图片'
},
dnd: '#uploader .queueList',
paste: document.body,
accept: {
title: 'Images',
extensions: 'jpg,jpeg,bmp,png,JPG,JPEG,BMP,PNG',
mimeTypes: 'image/*'
},
// swf文件路径
swf: BASE_URL + '/Uploader.swf',
disableGlobalDnd: true,
chunked: false,
server: '/ocr/upload',
fileNumLimit: 1, //文件数
fileSizeLimit: 5 * 1024 * 1024, // 50 M
fileSingleSizeLimit: 3 * 1024 * 1024, // 3 M
});
// 添加“添加文件”的按钮，
/*uploader.addButton({
id: '#filePicker2',
label: '继续添加'
});*/
// 当有文件添加进来时执行，负责view的创建
function addFile( file ) {
var $li = $( '<li id="' + file.id + '">' +
'<p class="title">' + file.name + '</p>' +
'<p class="imgWrap"></p>'+
'<p class="progress"><span></span></p>' +
'</li>' ),
$btns = $('<div class="file-panel">' +
'<span class="cancel">删除</span>' +
'<span class="rotateRight">向右旋转</span>' +
'<span class="rotateLeft">向左旋转</span></div>').appendTo( $li ),
$prgress = $li.find('p.progress span'),
$wrap = $li.find( 'p.imgWrap' ),
$info = $('<p class="error"></p>'),
showError = function( code ) {
switch( code ) {
case 'exceed_size':
text = '文件大小超出';
break;
case 'interrupt':
text = '上传暂停';
break;
default:
text = '上传失败，请重试';
break;
}
$info.text( text ).appendTo( $li );
};
if ( file.getStatus() === 'invalid' ) {
showError( file.statusText );
} else {
// @todo lazyload
$wrap.text( '预览中' );
uploader.makeThumb( file, function( error, src ) {
if ( error ) {
$wrap.text( '不能预览' );
return;
}
var img = $('<img src="'+src+'">');
$wrap.empty().append( img );
}, thumbnailWidth, thumbnailHeight );
percentages[ file.id ] = [ file.size, 0 ];
file.rotation = 0;
}
file.on('statuschange', function( cur, prev ) {
if ( prev === 'progress' ) {
$prgress.hide().width(0);
} else if ( prev === 'queued' ) {
$li.off( 'mouseenter mouseleave' );
$btns.remove();
}
// 成功
if ( cur === 'error' || cur === 'invalid' ) {
console.log( file.statusText );
showError( file.statusText );
percentages[ file.id ][ 1 ] = 1;
} else if ( cur === 'interrupt' ) {
showError( 'interrupt' );
} else if ( cur === 'queued' ) {
percentages[ file.id ][ 1 ] = 0;
} else if ( cur === 'progress' ) {
$info.remove();
$prgress.css('display', 'block');
} else if ( cur === 'complete' ) {
$li.append( '<span class="success"></span>' );
}
$li.removeClass( 'state-' + prev ).addClass( 'state-' + cur );
});
$li.on( 'mouseenter', function() {
$btns.stop().animate({height: 30});
});
$li.on( 'mouseleave', function() {
$btns.stop().animate({height: 0});
});
$btns.on( 'click', 'span', function() {
var index = $(this).index(),
deg;
switch ( index ) {
case 0:
uploader.removeFile( file );
return;
case 1:
file.rotation += 90;
break;
case 2:
file.rotation -= 90;
break;
}
if ( supportTransition ) {
deg = 'rotate(' + file.rotation + 'deg)';
$wrap.css({
'-webkit-transform': deg,
'-mos-transform': deg,
'-o-transform': deg,
'transform': deg
});
} else {
$wrap.css( 'filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (~~((file.rotation/90)%4 + 4)%4) +')');
}
});
$li.appendTo( $queue );
}
// 负责view的销毁
function removeFile( file ) {
var $li = $('#'+file.id);
delete percentages[ file.id ];
updateTotalProgress();
$li.off().find('.file-panel').off().end().remove();
}
function updateTotalProgress() {
var loaded = 0,
total = 0,
spans = $progress.children(),
percent;
$.each( percentages, function( k, v ) {
total += v[ 0 ];
loaded += v[ 0 ] * v[ 1 ];
} );
percent = total ? loaded / total : 0;
spans.eq( 0 ).text( Math.round( percent * 100 ) + '%' );
spans.eq( 1 ).css( 'width', Math.round( percent * 100 ) + '%' );
updateStatus();
}
function updateStatus() {
var text = '', stats;
if ( state === 'ready' ) {
text = '选中' + fileCount + '张图片，共' +
WebUploader.formatSize( fileSize ) + '。';
} else if ( state === 'confirm' ) {
stats = uploader.getStats();
if ( stats.uploadFailNum ) {
text = '已成功上传' + stats.successNum+ '张照片至服务器，'+
stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
}
} else {
stats = uploader.getStats();
text = '共' + fileCount + '张（' +
WebUploader.formatSize( fileSize ) +
'），已上传' + stats.successNum + '张';
if ( stats.uploadFailNum ) {
text += '，失败' + stats.uploadFailNum + '张';
}
}
$info.html( text );
}
function setState( val ) {
var file, stats;
if ( val === state ) {
return;
}
$upload.removeClass( 'state-' + state );
$upload.addClass( 'state-' + val );
state = val;
switch ( state ) {
case 'pedding':
$placeHolder.removeClass( 'element-invisible' );
$queue.parent().removeClass('filled');
$queue.hide();
$statusBar.addClass( 'element-invisible' );
uploader.refresh();
break;
case 'ready':
$placeHolder.addClass( 'element-invisible' );
$( '#filePicker2' ).removeClass( 'element-invisible');
$queue.parent().addClass('filled');
$queue.show();
$statusBar.removeClass('element-invisible');
uploader.refresh();
break;
case 'uploading':
$( '#filePicker2' ).addClass( 'element-invisible' );
$progress.show();
$upload.text( '暂停上传' );
break;
case 'paused':
$progress.show();
$upload.text( '继续上传' );
break;
case 'confirm':
$progress.hide();
$upload.text( '开始上传' ).addClass( 'disabled' );
stats = uploader.getStats();
if ( stats.successNum && !stats.uploadFailNum ) {
setState( 'finish' );
return;
}
break;
case 'finish':
stats = uploader.getStats();
if ( stats.successNum ) {
$upload.text( '上传成功' );
//alert( '上传成功' );
} else {
// 没有成功的图片，重设
state = 'done';
location.reload();
}
break;
}
updateStatus();
}
uploader.onUploadProgress = function( file, percentage ) {
var $li = $('#'+file.id),
$percent = $li.find('.progress span');
$percent.css( 'width', percentage * 100 + '%' );
percentages[ file.id ][ 1 ] = percentage;
updateTotalProgress();
};
uploader.onFileQueued = function( file ) {
fileCount++;
fileSize += file.size;
if ( fileCount === 1 ) {
$placeHolder.addClass( 'element-invisible' );
$statusBar.show();
}
addFile( file );
setState( 'ready' );
updateTotalProgress();
};
uploader.onFileDequeued = function( file ) {
fileCount--;
fileSize -= file.size;
if ( !fileCount ) {
setState( 'pedding' );
}
removeFile( file );
updateTotalProgress();
};
uploader.on( 'all', function( type ) {
switch( type ) {
case 'uploadFinished':
setState( 'confirm' );
break;
case 'startUpload':
setState( 'uploading' );
break;
case 'stopUpload':
setState( 'paused' );
break;
}
});
uploader.on( 'uploadSuccess', function( file,response ) {
var resultStr = response.data;
//alert(resultStr);
$( '#orcResult' ).html(resultStr);
});
uploader.onError = function( code ) {
if(code == 'Q_EXCEED_NUM_LIMIT'){
alert( 'Eroor: 只允许上传一张图！' );
}else{
alert( 'Eroor: ' + code );
}
};
$upload.on('click', function() {
if ( $(this).hasClass( 'disabled' ) ) {
return false;
}
if ( state === 'ready' ) {
uploader.upload();
} else if ( state === 'paused' ) {
uploader.upload();
} else if ( state === 'uploading' ) {
uploader.stop();
}
});
$info.on( 'click', '.retry', function() {
uploader.retry();
} );
$info.on( 'click', '.ignore', function() {
alert( 'todo' );
} );
$upload.addClass( 'state-' + state );
updateTotalProgress();
});
css用的bootstrap的及百度webuploader 中demo自带的css，这里就不贴出来了。
二、后端代码
这里因有涉及项目代码，不便贴全，至贴出代码实现主体部分。
接受前端页面的图片数据保存至服务器：
OcrController.java
import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;
public void savePic(HttpServletRequest request, HttpServletResponse response){ AjaxRetBean<Object> returnBean = new AjaxRetBean<> (); try { try { Thread.sleep(1000); } catch(InterruptedException ex) { Thread.currentThread().interrupt(); } String picture = ""; MultipartHttpServletRequest muRequest = (MultipartHttpServletRequest)request; Map<String, MultipartFile> files = muRequest.getFileMap();//得到文件map对象 String uploadUrl = request.getSession().getServletContext().getRealPath("/")+"upload/";//得到当前工程路径拼接上文件名 File dir = new File(uploadUrl); if(!dir.exists())//目录不存在则创建 dir.mkdirs(); for(MultipartFile file :files.values()){ String fileName= new Date().getTime() + "_" + file.getOriginalFilename(); picture = uploadUrl+fileName; File upFile = new File(uploadUrl+fileName);//创建文件对象 if(!upFile.exists()){//文件名不存在 则新建文件，并将文件复制到新建文件中 upFile.createNewFile(); file.transferTo(upFile); } } String str = AipOcrUtil.UploadFile(picture); returnBean.setSuccess(true); returnBean.setData(str); } catch (IOException e) { logger.error("文件上传错误："+e.getMessage()); } catch (Exception e){ logger.error(e.getMessage()); returnBean.setSuccess(false); returnBean.setMessage(e.getMessage()); } ResWriteUtil.writeObject(response,returnBean); }
AipOcrUtil.java
直接使用百度OCR提供的Api接口，接口详细：百度OCR-java
import com.alibaba.fastjson.JSONArray; import com.alibaba.fastjson.JSONObject; import com.baidu.aip.ocr.AipOcr; import org.json.JSONException; import java.util.HashMap; /** * Author: IrisNew * Description:百度Ocr文字识别 * Date: 2018/5/8 15:23 */ public class AipOcrUtil { //设置APPID/AK/SK 需自行去百度申请哦 private static final String APP_ID = "xxxx"; private static final String API_KEY = "xxxxxx"; private static final String SECRET_KEY = "xxxxxxx"; public static String UploadFile(String path) throws JSONException { // 初始化一个AipOcr AipOcr client = new AipOcr(APP_ID, API_KEY, SECRET_KEY); // 可选：设置网络连接参数 client.setConnectionTimeoutInMillis(2000); client.setSocketTimeoutInMillis(60000); // 调用接口 String resultStr = ""; org.json.JSONObject res = client.basicGeneral(path, new HashMap<String, String>()); JSONObject jsonObject = JSONObject.parseObject(res.toString()); JSONArray resultList = jsonObject.getJSONArray("words_result"); for(Object result:resultList){ JSONObject temp = (JSONObject) result; resultStr += temp.getString("words")+"<br/>"; } return resultStr; } }
至此，大功告成。看下效果吧。
三、效果展示
将这个图贴上试试
成功！
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