Java上传图片到服务器

HTML页面的标签

                            <div id="div_selectpic" align="right" style=" 300px;font-size: 15px;">
                                (格式jpg、bmp、png大小100K内)选择图片
                                <input name="txtfiles" type="text" id="txtfiles" style="display: none">
                                <input type="file" name="file_pic" id="file_pic" onchange="DynamicPicStr(this,100,'imgid','txtfiles',290,190)" style=" 70px;" class="easyui-linkbutton">
                            </div>
                            <div>
　　　　　　　　　　　　　　　　　　<img id="imgid" alt=""/>
                            </div>

上传照片的js方法

//新增时图片上传调用，uploadobj:页面传入的文件对象，limitfilessize:限定文件的大小
function DynamicPicStr(uploadobj, limitfilesize, divid, txtid, width, height) {
    var files = uploadobj.files[0];
    var oFReader = new FileReader();
    oFReader.readAsDataURL(files);
    var strurl="";//图片物理地址
    var txtobj = $("#"+txtid+"");
    var objdivimg = $("#"+divid+"");
    
    var limitpictype = ["jpg", "bmp", "png"];
    try {
        //console.info("图片大小："+files.size);
        if (parseInt(files.size / 1024) > limitfilesize) {
                alert("图片大小超过规定大小，只能小于" + limitfilesize + "K");
                txtobj.value = "";
                return false;
        }
        var filename = files.name;
        if (filename != "" && filename != null) {
            var searchindex = filename.indexOf(".");
            var filetypename = filename.substring(searchindex + 1, filename.length);
            var pictypebool = false;
            for (var i = 0; i < limitpictype.length; i++) {
                if (limitpictype[i].toLowerCase() == filetypename.toLowerCase()) {
                    pictypebool = true;
                    break;
                }
            }
            if (!pictypebool) {
                alert("图片类型不符合要求，图片类型只能是jpg , bmp , png");
                txtobj.value = "";
                return false;
            }
        }
    }
    catch (e) {
        alert(e.name + ": " + e.message + ",判断图片类型、图片大小失败");
    }
    
    oFReader.onloadend = function(oFRevent) {
        strurl = oFRevent.target.result;
        objdivimg.attr("src",strurl);
        txtobj.val(files);
    }
    //objdivimg.attr("src",oFReader.result);
    txtobj.val(files);

    console.info("图："+strurl);
    objdivimg.attr("width",width);
    objdivimg.attr("height", height);
    upload(uploadobj);
    }

    //文件上传的方法
    function upload(file) {
        //let img = document.getElementById('img')
        let formData = new FormData()
        let temp = file.files[0]
        var strurl = getContextPathInfo() + "/LowZjblb/upload";
        if(temp) {
            formData.append('file', temp)
            //img.src = window.URL.createObjectURL(temp)
            $.ajax({
                url: strurl,
                type: "POST",
                data: formData,
                processData: false, // 告诉jQuery不要去处理发送的数据
                contentType: false, // 告诉jQuery不要去设置Content-Type请求头
                success: function(result) {
                    $("#newzjzp").val(result.appenddata);//服务器保存的路径
                    //alert(result);
                }
            })
        }
    }

java后端Controller接收的方法

    /**
     * 
     * @Title:图片上传返回路径   
     * @Description
     * @param MultipartFile，request
     * @return  服务器保存的图片地址url
     * @throws
     */
    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    @ResponseBody
    @Log(module = "法证补领管理", operation = "添加")
    public OperationResult upload(@RequestParam("file") MultipartFile files,HttpServletRequest request) {
        OperationResult result = new OperationResult(OperationResultTypeEnum.ERROR, "增加记录失败");
        String dicName="UpFile";//服务器上传文件夹名称
        String newFileName=files.getOriginalFilename();    
        newFileName=newFileName.substring(0,newFileName.lastIndexOf("."));
        String picurl = UploadFile.saveFile(files,newFileName,dicName, request);
        result.setResulttype(OperationResultTypeEnum.SUCCESS);
        result.setMsg("上传成功");
        result.setAppenddata(picurl);
        return result;
    }

java后端负责保存图片的方法如下

    public static String saveFile(MultipartFile filedata,String newFileName,String dicName, HttpServletRequest request) {
        // TODO Auto-generated method stub
        String pathval = request.getSession().getServletContext().getRealPath("/");
        // 根据配置文件获取服务器图片存放路径
        //String newFileName = String.valueOf(System.currentTimeMillis());
        Calendar cale = null;  
       cale = Calendar.getInstance();  
       String year = String.valueOf(cale.get(Calendar.YEAR));  
       String month = String.valueOf(cale.get(Calendar.MONTH) + 1); 
        String saveFilePath = "UpFile/"+dicName+"/"+year+"/"+month+"/";
        /* 构建文件目录 */
        File fileDir = new File(pathval + saveFilePath);
        if (!fileDir.exists()) {
            fileDir.mkdirs();
        }
        // 上传的文件名
        String filename = filedata.getOriginalFilename();
        // 文件的扩张名
        String extensionName = filename.substring(filename.lastIndexOf(".") + 1);
        try {
            String imgPath = saveFilePath + newFileName + "." + extensionName;
            // System.out.println(pathval + imgPath);打印图片位置
            FileOutputStream out = new FileOutputStream(pathval + imgPath);
            // 写入文件
            out.write(filedata.getBytes());
            out.flush();
            out.close();
            return imgPath;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }