文件下载demo,文件名称包含特殊字符

今天药忘吃喽~ 2023-02-13 03:51 30阅读 0赞

public static void main(String\[\] args) \{

try {
    		String sql="";//查询文件信息sql
    		Map fileMap=new HashMap<String,String>();//获取到文件相关信息,这里只是演示,没有具体实现
    		
    		
    		String FileName = (String) fileMap.get("FileName"); //文件名
    		String  filenum=(String) fileMap.get("filenum");//存放在服务器上的具体名称
    		String filename = filenum + FileName.substring(FileName.lastIndexOf(".")); // 存到到服务器上的名称
    
    		
    		String folder = (String) fileMap.get("FilePath"); // 附件所在目录
    		String newFolder = folder.toLowerCase();
    		String appPath="";//服务器路径
    		String fullfilepath = fullfilepath =appPath + folder + File.separator + filename; // 文件所在硬盘的真实路径
    
    
    		/* 读取文件 */
    		File file = new File(fullfilepath);
    		
    
    		if (file.exists()) {
    			HttpServletResponse response =null;
    			response.reset();
    			String extFileName = FileName.substring(FileName.lastIndexOf(".") + 1);
    			HttpServletRequest request=null;
    			String userAgent = request.getHeader("User-Agent");
    			// IE内核浏览器
    			if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
    				FileName = java.net.URLEncoder.encode(FileName, "UTF-8");
    			} else {
    				// 非IE浏览器的处理：
    				FileName = new String(FileName.getBytes("UTF-8"), "ISO-8859-1");
    			}
    			String contentType = "application/x-msdownload";
    		
    			// 直接提示下载
    		
    			response.setHeader("Content-disposition",
    					String.format("attachment; filename=\"%s\"", FileName));
    		//	response.setContentType("multipart/form-data");
    			response.setCharacterEncoding("UTF-8");
    			response.setContentType(contentType);
    			int fileLength = (int) file.length();
    			response.setContentLength(fileLength);
    			/* 如果文件长度大于0 */
    			if (fileLength != 0) {
    				/* 创建输入流 */
    				InputStream inStream = new FileInputStream(file);
    				byte[] buf = new byte[4096];
    				/* 创建输出流 */
    				ServletOutputStream servletOS = response.getOutputStream();
    				int readLength;
    				while (((readLength = inStream.read(buf)) != -1)) {
    					servletOS.write(buf, 0, readLength);
    				}
    				inStream.close();
    				servletOS.flush();
    				servletOS.close();
    
    			}
    		} else {
    			System.out.println("文件不存在");//实际上这里应该是日志输出
    		}
    	} catch (Exception e) {
    		//日志输出
    		System.out.println("文件下载出错!");
    		
    	}
    }