文件下载

java代码：

@RequestMapping("/downcsv")
    public void downcsv(String filePath ,HttpServletResponse response){
        PrintWriter out=null;
        BufferedReader bReader=null;
        try {
            // // 获取网站部署路径(通过ServletContext对象)，用于确定下载文件位置，从而实现下载
            // String path = request.getServletContext().getRealPath("/");
            if(StringUtils.isBlankOrNull(filePath)){
                myLogger.info("文件地址错误");
                return;
            }
            String name =filePath.substring(filePath.lastIndexOf("/"));
            name = new String(name.getBytes(), "ISO-8859-1");//文件名乱码处理
            // 1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
            response.setContentType("multipart/form-data");
            // 2.设置文件头：最后一个参数是设置下载文件名(假如我们叫a.pdf)
            response.setHeader("Content-Disposition", "attachment;fileName=" + name);
            // 3.通过response获取ServletOutputStream对象(out)
            out = response.getWriter();
            bReader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath),"UTF-8"));
            String line = "";
            out.write("\ufeff");//保存为csv乱码处理
            while ((line = bReader.readLine()) != null) {
                out.write(line+"\n");
            }
            
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
                if (out != null) {
                    out.flush();
                    out.close();
                }
                try {
                    if(null!=bReader){
                        bReader.close();
                    }
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }
    }

js提交：

var url="taskExport/downcsv";
            var filePath=data.file_url;
          var form = $("<form></form>").attr("action", url).attr("method", "post");
            form.append($("<input></input>").attr("type", "hidden").attr("name", "filePath").attr("value", filePath));
            form.appendTo('body').submit().remove();