ajaxfileupload异步上传图片

本是古典何须时尚 2022-05-31 01:27 314阅读 0赞

1.html

2.ajaxfileupload.js

jQuery.extend({
    
        createUploadIframe: function(id, uri)
        {
            //create frame
            var frameId = 'jUploadFrame' + id;
    
            if(window.ActiveXObject) {
                //add by bdqn_hl 2014-3-2 start
                if(jQuery.browser.version=="9.0"){
                    io = document.createElement('iframe');
                    io.id = frameId;
                    io.name = frameId;
                }else if(jQuery.browser.version=="6.0" ||jQuery.browser.version=="7.0" ||jQuery.browser.version=="8.0"){
                    var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                    if(typeof uri== 'boolean'){
                        io.src = 'javascript:false';
                    }
                    else if(typeof uri== 'string'){
                        io.src = uri;
                    }
                }
                //add by bdqn_hl 2014-3-2 end
                /*
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
                */
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';
    
            document.body.appendChild(io);
    
            return io
        },
        createUploadForm: function(id, fileElementId)
        {
            //create form   
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
            var oldElement = $('#' + fileElementId);
            var newElement = $(oldElement).clone();
            $(oldElement).attr('id', fileId);
            $(oldElement).before(newElement);
            $(oldElement).appendTo(form);
            //set attributes
            $(form).css('position', 'absolute');
            $(form).css('top', '-1200px');
            $(form).css('left', '-1200px');
            $(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 = s.fileElementId;
            var form = jQuery.createUploadForm(id, s.fileElementId);
            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.innerHTML:null;
                        xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
    
                    }else if(io.contentDocument)
                    {
                        xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML: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
                    {
                        $(io).remove();
                        $(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 io = $('#' + frameId);
                var form = $('#' + formId);
                $(form).attr('action', s.url);
                $(form).attr('method', 'POST');
                $(form).attr('target', frameId);
                if(form.encoding)
                {
                    form.encoding = 'multipart/form-data';
                }
                else
                {
                    form.enctype = 'multipart/form-data';
                }
                $(form).submit();
    
            } catch(e)
            {
                jQuery.handleError(s, xml, null, e);
            }
            if(window.attachEvent){
                document.getElementById(frameId).attachEvent('onload', uploadCallback);
            }
            else{
                document.getElementById(frameId).addEventListener('load', uploadCallback, false);
            }
            return {abort: function () {}};
    
        },
        handleError: function( s, xhr, status, e )      {
            // If a local callback was specified, fire it
            if ( s.error ) {
                s.error.call( s.context || s, xhr, status, e );
            }
    
            // Fire the global callback
            if ( s.global ) {
                (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, 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 );
            // Get the JavaScript object, if JSON is used.
            if ( type == "json" )
            //data会被加<pre>导致AJAX不走success方法,改为如下形式
            //eval("data = \" "+data+" \" ");
            // data = JSON.parse(data);
            // evaluate scripts within html
            if ( type == "html" )
                jQuery("<div>").html(data).evalScripts();
            //alert($('param', data).each(function(){alert($(this).attr('value'));}));
            return data;
        }
    })

3.本地js

//上传图片
    function setImagePreview(type ,fieldName) {
        var img_txt, localImag, file_head = document.getElementById("inputImage"), picture = file_head.value;
    
        if (!picture.match(/.jpg|.jpeg|.gif|.png|.bmp/i))
            return alert("您上传的图片格式不正确，请重新选择！"), !1;
    
        var src = window.navigator.userAgent.indexOf("Chrome") >= 1
        || window.navigator.userAgent.indexOf("Safari") >= 1 ? window.webkitURL
                .createObjectURL(file_head.files[0])
            : window.URL.createObjectURL(file_head.files[0]);
    
        if ($("#userImg"), file_head.files && file_head.files[0]) {
    
        }else{
            return;
        }
    
        var imgi = $("#userImg")
        imgi.attr("src", src);
    
        $.ajaxFileUpload({
            fileElementId: "inputImage",                     //需要上传的文件域的ID，即<input type="file">的ID。
            url: "${base}/upload/uploadCardImg?type="+type,  //后台方法的路径
            type: 'post',                                    //当要提交自定义参数时，这个参数要设置成post
            dataType: 'json',                                //服务器返回的数据类型。可以为xml,script,json,html。如果不填写，jQuery会自动判断。
            secureuri: false,                                //是否启用安全提交，默认为false。
            async : true,                                    //是否是异步
            success: function(result) {
                result = JSON.parse(result);
                console.log(result);
                if(result.code === 200){
                    var path = result.data;
                    $("#imgUrl").val(path);
                }else{
                    layer.msg("上传失败，请重新上传", {icon: 2, time: 2000});
                }
            },
            error : function(data, status, e) {
                 console.log(data);
            }
        });
    
    }

4.后台代码

package com.project.controller;
    
    
    import java.io.File;
    import java.io.IOException;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.apache.commons.lang3.RandomStringUtils;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.multipart.commons.CommonsMultipartFile;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import com.project.utils.Constant;
    
    /**
     *  前端控制器
     */
    @Controller
    @RequestMapping("/upload")
    public class UploadController extends BaseController{
    
        //上传用户头像
        @RequestMapping(value = "/uploadCardImg")
        @ResponseBody
        public String uploadCardImg(@RequestParam("uploadfile") CommonsMultipartFile file, HttpServletRequest request) {
            logger.info("参数：" + JSON.toJSONString(request.getParameterMap()));
            JSONObject result = new JSONObject();
            try {
                JSONObject jsonObject = new JSONObject();
                String type = request.getParameter("type");
                String fileCPath = Constant.USER_UPDATE_IMG_PATH;
                File f = new File(request.getSession().getServletContext().getRealPath("/"));
                File parentFile = f.getParentFile();
                String path = parentFile + fileCPath;// 存放位置
                File f1 = new File(path);
                if (!f1.exists()) {
                    f1.mkdirs();
                }
                String resultPath = saveImg(type, path, file, fileCPath);
                if(resultPath==null){
                    jsonObject.put("code", 300);
                    return JSONObject.toJSONString(jsonObject);
                }else{
                    jsonObject.put("code", 200);
                    jsonObject.put("data", resultPath);
                    return JSONObject.toJSONString(jsonObject);
                }
            } catch (Exception e) {
                e.printStackTrace();
                return JSONObject.toJSONString(buildExceptionResult(e));
            }
        }
    
        //保存图片
        private String saveImg(String type , String path , CommonsMultipartFile file ,String fileCPath){
            String fileName = file.getOriginalFilename();
            System.out.println("fileName = " + fileName);
            if(fileName.equals("") || fileName == null){
                return null;
            }
            if(type==null){
                type = "type";
            }
            String fileType = fileName.substring(fileName.indexOf("."), fileName.length());
            fileName = type+"-"+ RandomStringUtils.randomAlphanumeric(16) + fileType;
            File destFile = new File(path+"/"+fileName);
            try {
                file.transferTo(destFile);
                if(destFile.length()<10){
                    return null;
                }
                return fileCPath+"/"+fileName;
            } catch (IllegalStateException | IOException e) {
                e.printStackTrace();
            }
            return null;
        }
    }

5.备注

控制层返回的参数，必须是json的字符串，在则，尽量使用上面的ajaxfileupload.js，不然可能不会到success中，上传成功也走error。