java实现文件在线预览

    @RequestMapping(value = "/showview")
    @ResponseBody
    public Map showview(String fileurl) {
        // 返回值
        Map map = new HashMap();
        try {
            String files = "png,jpg,jpeg,gif,pdf,doc,docx,docm,dotm,dotx,xlsx,xlsb,xls,xlsm,pptx,ppsx,ppt,pps,pptm,potm,ppam,potx,ppsm";

            String url = baseUrl+fileurl;//获取文件地址
            if (!"".equals(url) && url != null) {
                //获取文件后缀
                String postfix = url.substring(url.lastIndexOf(".") + 1);
                //判断是否支持预览
                if(files.contains(postfix)) {
                    //获取配置文件中图片路径
                    //拼接地址组成http://img.mostsd.com/uploadfiles/bizDownload/2019/01/15471089090894167.doc
                    String openofficeurl = "http://view.officeapps.live.com/op/view.aspx?src=";
                    String showviewUrl = "";
                    if("pdf".equals(postfix) || "png".equals(postfix) || "jpg".equals(postfix) || "jpeg".equals(postfix) || "gif".equals(postfix)) {
                        showviewUrl = url;
                    }else {
                        showviewUrl = openofficeurl+ URLEncoder.encode(url, "utf-8");
                    }
                    map.put("result", "000");
                    map.put("showviewUrl", showviewUrl);
                }else {
                    map.put("result", "001");
                    map.put("message", "该附件格式不支持在线预览！");
                }

            } else {
                map.put("result", "001");
                map.put("message", "当前数据没有附件");
            }

        } catch (Exception e) { // result的值：000操作成功，001操作失败，002操作失败、程序出现异常
            map.put("result", "002");
            map.put("message", "程序异常！");
            e.printStackTrace();
        }
        return map;
    }