itoo在线编辑——mongo学习1

深碍√TFBOYSˉ_ 2022-09-25 11:19 202阅读 0赞

# 一、前台 #

## 1. jsp页面 ##

html标签里面要有个type 为“file”的input。例子如下：

<div style="padding-top: 8px;">
        <p class="ui-tips">上传头像会自动生成头像缩略图片，您也可以拖动大图的裁剪区域，调整缩图内容。</p>
        <p class="ui-tips">支持JPG、GIF、PNG等图片格式推荐尺寸：180*180像素</p>
        <input type="file" name="fileCoursePoster" οnchange="uploadCoursePoster();" id="fileCoursePoster"/>
        <span id="errorCoursePoster" style="color: red; display: none;">请上传图片！</span>
        <input type="hidden" id="imageType" name="imageType">
        </div><code><span style="color:#93a1a1;"><span></span></span><span style="color:#48484c;"><span></span></span><span style="color:#93a1a1;"><span></span></span></code>

## 引用的插件：ajaxfileupload.js ##

jQuery.extend({ {
        createUploadIframe: function(id, uri)
    {
    //create frame
    		var frameId ='jUploadFrame'+ id;
    		var iframeHtml ='<iframe id="'+ frameId +'" name="'+ frameId +'" style="position:absolute; top:-9999px; left:-9999px"';
    if(window.ActiveXObject)
    {
    if(typeof uri=='boolean'){
    				iframeHtml +=' src="'+'javascript:false'+'"';
    
    }
    elseif(typeof uri=='string'){
    				iframeHtml +=' src="'+ uri +'"';
    
    }
    }
    		iframeHtml +=' />';
    		jQuery(iframeHtml).appendTo(document.body);
    
    return jQuery('#'+ frameId).get(0);
    },
        createUploadForm: function(id,fileElementId,data,fileElement)
    {
    //create form	
    		var formId ='jUploadForm'+ id;
    		var fileId ='jUploadFile'+ id;
    		var form = jQuery('<form  action="" method="POST" name="'+ formId +'" id="'+ formId +'" enctype="multipart/form-data"></form>');
    if(data)
    {
    for(var i in data)
    {
    				jQuery('<input type="hidden" name="'+ i +'" value="'+ data[i]+'" />').appendTo(form);
    }
    }
    		var oldElement;
    if(fileElement ==null)
    			oldElement = jQuery('#'+ fileElementId);
    else
    			oldElement = fileElement;
    		var newElement = jQuery(oldElement).clone();
    		jQuery(oldElement).attr('id', fileId);
    		jQuery(oldElement).before(newElement);
    		jQuery(oldElement).appendTo(form);
    //set attributes
    		jQuery(form).css('position','absolute');
    		jQuery(form).css('top','-1200px');
    		jQuery(form).css('left','-1200px');
    		jQuery(form).appendTo('body');
    return form;
    },
    
        ajaxFileUpload: function(s){
    // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id =newDate().getTime()
    		var form = jQuery.createUploadForm(id, s.fileElementId,(typeof(s.data)=='undefined'?false:s.data),s.fileElement);
    		var io = jQuery.createUploadIframe(id, s.secureuri);
    		var frameId ='jUploadFrame'+ id;
    		var formId ='jUploadForm'+ id;
    // Watch for a new set of requests
    if( s.global &&! jQuery.active++)
    {
    			jQuery.event.trigger("ajaxStart");
    }
            var requestDone =false;
    // Create the request object
            var xml ={}
    if( s.global )
                jQuery.event.trigger("ajaxSend",[xml, s]);
    // Wait for a response to come back
            var uploadCallback = function(isTimeout)
    {
    			var io = document.getElementById(frameId);
    try
    {
    if(io.contentWindow)
    {
    					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerText:null;
                    	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
    }elseif(io.contentDocument)
    {
    					xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerText:null;
                    	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
    }
    }catch(e)
    {
    				jQuery.handleError(s, xml,null, e);
    }
    if( xml || isTimeout =="timeout")
    {
                    requestDone =true;
                    var status;
    try{
                        status = isTimeout !="timeout"?"success":"error";
    // Make sure that the request was successful or notmodified
    if( status !="error")
    {
    // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData( xml, s.dataType );
    // If a local callback was specified, fire it and pass it the data
    if( s.success )
                                s.success( data, status );
    // Fire the global callback
    if( s.global )
                                jQuery.event.trigger("ajaxSuccess",[xml, s]);
    }else
                            jQuery.handleError(s, xml, status);
    }catch(e)
    {
                        status ="error";
                        jQuery.handleError(s, xml, status, e);
    }
    
    // The request was completed
    if( s.global )
                        jQuery.event.trigger("ajaxComplete",[xml, s]);
    
    // Handle the global AJAX counter
    if( s.global &&!--jQuery.active )
                        jQuery.event.trigger("ajaxStop");
    
    // Process result
    if( s.complete )
                        s.complete(xml, status);
    
                    jQuery(io).unbind()
    
                    setTimeout(function()
    {try
    {
    											jQuery(io).remove();
    											jQuery(form).remove();
    }catch(e)
    {
    											jQuery.handleError(s, xml,null, e);
    }
    
    },100)
    
                    xml =null
    
    }
    }
    // Timeout checker
    if( s.timeout >0)
    {
                setTimeout(function(){
    // Check to see if the request is still happening
    if(!requestDone ) uploadCallback("timeout");
    }, s.timeout);
    }
    try
    {
    
    			var form = jQuery('#'+ formId);
    			jQuery(form).attr('action', s.url);
    			jQuery(form).attr('method','POST');
    			jQuery(form).attr('target', frameId);
    if(form.encoding)
    {
    				jQuery(form).attr('encoding','multipart/form-data');
    }
    else
    {
    				jQuery(form).attr('enctype','multipart/form-data');
    }
                jQuery(form).submit();
    
    }catch(e)
    {
                jQuery.handleError(s, xml,null, e);
    }
    		jQuery('#'+ frameId).load(uploadCallback);
    return{abort: function(){
    try
    {
    				jQuery('#'+ frameId).remove();
    				jQuery(form).remove();
    }
    catch(e){}
    }};
    },
    
        uploadHttpData: function( r, type ){
            var data =!type;
            data = type =="xml"|| data ? r.responseXML: r.responseText;
    // If the type is "script", eval it in global context
    if( type =="script"){
            	jQuery.globalEval( data );
    }elseif( type =="json"){
            	eval("data = "+ data );
    }elseif(type =="html"){
            	jQuery("<div>").html(data).evalScripts();
    }
    return data;
    },
    	handleError: function( s, xml, status, e ){
    // If a local callback was specified, fire it
    if( s.error )
    			s.error( xml, status, e );
    
    // Fire the global callback
    if( s.global )
    			jQuery.event.trigger("ajaxError",[xml, s, e]);
    }
    });

## js ##

$.ajaxFileUpload({
        			url : ctx+"/media/uploadImages",
        //			secureuri : false,//安全
        			type:"Post",
        			dataType:'json',
        			data :{
        "questionMainId": getQuestionMainId,
        "imageType": imageType,
        "pictureID":pictureID
        },
        			fileElementId :"fileCoursePoster",// 文件选择框的id属性
        			success : function(data, status){
        				alert("上传成功！");
        },
        			error : function(XMLHttpRequest, textStatus, errorThrown){
        				alert("上传失败！");
        }
        });

# 后台 #

1.封装的java类

/**
        	 * mongo底层代码，由于底层代码没有我需要的东西，只能在这里重新写一遍了
        	 * 十一期  谭倩倩
        	 * @MethodName	: getMongo
        	 * @Description	: 获取数据连接
        	 * @return 返回mongon
        	 */
        privateMongo getMongo(){
        Mongo mongo=null;
        try{
        			mongo =newMongo("192.168.22.246",27017);
        }catch(Exception e){
        			e.printStackTrace();
        }
        return mongo;
        }
        /**
        	 * mongo底层代码，由于底层代码没有我需要的东西，只能在这里重新写一遍了
        	 * 十一期  谭倩倩
        	 *  @MethodName	: uploadFile
        	 * @Description	: 上传文件
        	 * @param file ：文件，File类型
        	 * @param delPictureID	：唯一标示文件，可根据id查询到文件.必须设置
        	 * @param dbName ：库名，每个系统使用一个库
        	 * @param collectionName：集合名，如果传入的集合名库中没有，则会自动新建并保存
        	 * @param map：放入你想要保存的属性，例如文件类型（“congtentType”".jpg"）,字符串类型，区分大小写，如果属性没有的话会自动创建并保存
        	 */
        publicvoid uploadFileByObjectId(File file ,ObjectId delPictureID,String dbName,String collectionName,LinkedHashMap<String,Object> map){
        //把mongoDB的数据库地址配置在外部。
        try{
        Mongo mongo =getMongo();
        //每个系统用一个库
        			DB db= mongo.getDB(dbName);
        System.out.println(db.toString());
        //每个库中可以分子集
        GridFS gridFS=newGridFS(db,collectionName);
        // 创建gridfsfile文件
        GridFSFile gridFSFile = gridFS.createFile(file);
        //将文件属性设置到
        			gridFSFile.put("_id", delPictureID);
        //循环设置的参数
        if(map !=null&& map.size()>0){
        for(String key : map.keySet()){
        					gridFSFile.put(key, map.get(key));
        }
        }
        //保存上传
        			gridFSFile.save();
        }catch(Exception e){
        			e.printStackTrace();
        }
        }

2.Controller代码

/**
        	 * 十一期 谭倩倩
        	 * 上传图片
        	 * @param filePhone
        	 * @param request
        	 * @param response
        	 * @throws IOException
        	 */
        @RequestMapping(value ="media/uploadImages", produces ="text/plain;charset=UTF-8")
        @ResponseBody
        publicvoid uploadImages(HttpServletRequest request,HttpServletResponse response)
        throwsIOException{
        QuestionMain enQuestionMain=null;
        String getPath=null;
        String dataBaseName =(String) request.getSession().getAttribute(CloudContext.DatabaseName)+DataBaseClass.getExamdatabase();
        MultipartHttpServletRequest multipartRequest=(MultipartHttpServletRequest)request;
        String fileName="";
        String questionMainId=request.getParameter("questionMainId");
        ObjectId pictureID=ObjectId.get();
        String delPictureID=pictureID.toString();
        System.out.println(delPictureID);
        for(Iterator it=multipartRequest.getFileNames();it.hasNext();){
        String key=(String)it.next();
        MultipartFile nulfile=multipartRequest.getFile(key);
        			fileName=nulfile.getOriginalFilename();
        //File getFilePath=new File(fileName);
        String logoRealPathDir = request.getSession().getServletContext().getRealPath(fileName);
        File localFile =newFile(logoRealPathDir);
        LinkedHashMap map =newLinkedHashMap();
        String mongoDbName ="exam";
        String collectionName ="aa";
        MongoUtil mongoUtil =newMongoUtil();
        			nulfile.transferTo(localFile);
        try{
        this.uploadFileByObjectId(localFile, pictureID, mongoDbName, collectionName,map);
        System.out.println("导入图片成功！！");
        }catch(Exception e){
        System.out.println("导入图片失败！！");
        }
        try{
        				enQuestionMain=questionMainBean.queryQuestionMainById(questionMainId, dataBaseName);
        System.out.println("查询题干成功");
        				 enQuestionMain.setImageName(delPictureID);
        				 enQuestionMain.setDataBaseName(dataBaseName);
        boolean flag=paperMainBean.updateQuestionMain(enQuestionMain);
        if(flag==true){
        System.out.println("更新成功");
        }
        }catch(Exception e){
        System.out.println("更新失败");
        }
        			getPath="http://192.168.22.248/exam/"+pictureID;;
        }
    
        		jacksonJson.beanToJson(response,getPath);
        }