不使用插件预览pdf等类型文件

前端使用window.open即可

var url="file/preview.do?path="+response.path+"&fileName="+response.name;
top.window.open(url,response.name,"_blank");

接口代码如下

	@RequestMapping(value = "/file/preview.do")
	public @ResponseBody String preview(HttpServletRequest request, HttpServletResponse resp, String path, String fileName) throws IllegalStateException, IOException
	{
		InputStream inputStream = xxxx;//把需要预览的文件转成文件流
		OutputStream outputStream = resp.getOutputStream();
		String fileSuffix = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
        //把doc文档转pdf
		if (fileSuffix.matches("doc|docx"))
		{
		    // spire.doc.free
		    Document document = new Document();
		    document.loadFromStream(inputStream);
		    document.saveToStream(outputStream, FileFormat.PDF);
		}
        //把excel转pdf
		else if (fileSuffix.matches("xls|xlsx"))
		{
            //spire.xls.free
			Workbook workbook = new Workbook();
			workbook.loadFromStream(inputStream);
			workbook.saveToStream(outputStream, FileFormat.PDF);
		}
		else
		{
			if (!fileSuffix.matches("jpg|jpeg|png|gif|bmp|tiff|ai|cdr|eps|pdf"))
			{
				resp.setContentType("application/octet-stream;charset=UTF-8");
				resp.addHeader("Content-Disposition", "attachment;filename=" + fileName);
			}
			byte[] b = new byte[1024];
			int length;
			while ((length = inputStream.read(b)) > 0)
			{
				outputStream.write(b, 0, length);
			}
		}
		outputStream.flush();
		outputStream.close();
		inputStream.close();
		return null;
	}

如果需要把doc文档或者excel转为pdf，然后再进行预览的话需要引入spire.doc.free或者spire.xls.free的jar