XMLHttpRequest导出文件

这里提供一些代码片段，具体的业务的代码被略去，

JavaScript片段

var request = new XMLHttpRequest();
 request.open("POST", BASE_URL + "?method=exportAsTxt");
 request.responseType = "blob"; // 返回类型blob
 request.onload = function() {
  if (this.status === 200) {
   var name = request.getResponseHeader("Content-disposition");
   var filename = name.substring(20, name.length);
   var blob = this.response;
   var reader = new FileReader();
   reader.readAsDataURL(blob);
   reader.onload = function(e) {
    var a = document.createElement('a');
    a.download = filename;
    a.href = e.target.result;
    $("body").append(a);
    a.click();
    $(a).remove();
   }
  }
 }
 request.send();

Java端

        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("application/octet-stream;charset=UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + METER_MONTHLY_READING_REPORT + month + ".txt");
        exportAsTxt(response.getOutputStream(), datas);