後臺JAVA生成文件流，前端頁面下載文件方法

 // 導出Excel表格
		$('.exportExcel').click(function(){		
			var	data ={};
			var url = ""//接口地址;
			DownLoad({ url:url,data:data});
		});
		function DownLoad(options) {
			var config = $.extend(true, { method: 'post' }, options);
			var $iframe = $('<iframe id="down-file-iframe" />');
			var $form = $('<form target="down-file-iframe" method="' + config.method + '" />');
			$form.attr('action', config.url);
			for (var key in config.data) {
			$form.append('<input type="hidden" name="' + key + '" value="' + config.data[key] + '" />');
			 }
			$iframe.append($form);
			$(document.body).append($iframe);
			$form[0].submit();
			$iframe.remove();
		}