java web在线预览word，pdf，ppt，jpg等文件

[技术新人牛]

在做一个附件预览的功能，代码写了一些，但是在页面展示不出来，浏览器总是提示下载

代码如下使用spring mvc
controller中的

@RequestMapping("/read.bo")
public void read(HttpServletRequest request, HttpServletResponse response,
			BaseRequest brqs) {

		OutputStream os = null;

		try {
			// 验证参数
			String id = request.getParameter("id");

			if (id == null || id.length() == 0) {
				throw new WAFException("参数缺失！");
			}

			AttachmentVO attachmentVO = getService().getVOById(id);

			if (attachmentVO == null) {
				throw new WAFException("参数缺失！");
			}

			String path = attachmentVO.getUrl() + File.separator
					+ attachmentVO.getPhysicalname();

			String fileRealPath = request.getServletContext().getRealPath(path);
			File file = new File(fileRealPath);
			String filename = attachmentVO.getSourcename();

			if (!file.exists()) {
				throw new WAFException("阅读的附件不存在！");
			}

			// 读取文件
			InputStream fis = new BufferedInputStream(new FileInputStream(
					fileRealPath));
			byte[] buffer = new byte[fis.available()];
			fis.read(buffer);
			fis.close();
			response.reset();

			// 设置下载文件名等
			String showFileName = new String(filename.replaceAll(" ", "")
					.getBytes("utf-8"), "iso8859-1");
			String extName = showFileName.substring(
					showFileName.lastIndexOf(".")).toLowerCase();
			response.addHeader("Content-Disposition", "attachment;filename="
					+ showFileName);
			response.addHeader("Content-Length", "" + file.length());
			// 设置内容编码
			response.setCharacterEncoding(WAFConstants.CHARSET_DEFAULT);
			// 设置响应MIME
			if (".doc".equals(extName)) {
				response.setContentType("application/msword");
			} else if (".docx".equals(extName)) {
				response.setContentType("application/vnd.openxmlformats-officedocument.wordprocessingml.document");
			} else if (".pdf".equals(extName)) {
				response.setContentType("application/pdf");
			} else if (".xls".equals(extName)) {
				response.setContentType("application/vnd.ms-excel");
			} else if (".xlsx".equals(extName)) {
				response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
			} else if (".ppt".equals(extName)) {
				response.setContentType("application/vnd.ms-powerpoint");
			} else if (".pptx".equals(extName)) {
				response.setContentType("application/vnd.openxmlformats-officedocument.presentationml.presentation");
			} else if (".bmp".equals(extName)) {
				response.setContentType("image/bmp");
			} else if (".gif".equals(extName)) {
				response.setContentType("image/gif");
			} else if (".ief".equals(extName)) {
				response.setContentType("image/ief");
			} else if (".jpeg".equals(extName)) {
				response.setContentType("image/jpeg");
			} else if (".jpg".equals(extName)) {
				response.setContentType("image/jpeg");
			} else if (".png".equals(extName)) {
				response.setContentType("image/png");
			} else if (".tiff".equals(extName)) {
				response.setContentType("image/tiff");
			} else if (".tif".equals(extName)) {
				response.setContentType("image/tif");
			}

			os = new BufferedOutputStream(response.getOutputStream());
			os.write(buffer);// 输出文件
			os.flush();

			response.flushBuffer();

		} catch (Exception e) {
			e.printStackTrace();
			if (os != null) {
				try {
					os.write(e.getLocalizedMessage().getBytes(
							WAFConstants.CHARSET_DEFAULT));
					os.flush();
				} catch (Exception le) {
					// NOOP
				}
			}
		} finally {
			if (os != null) {
				try {
					os.close();
				} catch (Exception e) {
					// NOOP
				}
			}
		}

	}

jsp页面

$(function(){
		var id = "${id}";
		var url = waf.contextPath + "/bpms/peform/core/attachment/read.bo?id=" + id;
		
		$("#v_waf_bpms_attach_read").html("<iframe width='100%' height='100%' src='" + url + "' />");
	})

代码就是这么多，总是提示下载。请各位大神帮帮忙，谢谢

[qq_36439926]

在哪下载啊？