文件下载

川长思鸟来 2022-08-23 00:52 33阅读 0赞

String filePath = wenjianService.getlujing(attachId);
    		String fileName= wenjianService.getwenjianmingchengPathName(attachId);
    
    		//下载根据文件的名称和文件路径，这些路径和名称是在一个单独的表中存在，用来单独管理这些文件
    		DownloadUtil.down(request, response, fileName, filePath);
    		
    		
    
    		//下载的Java文件
    		public static void down(HttpServletRequest request, HttpServletResponse response
    			,String filename,String filepath) throws Exception{
    	 	
    		//response.setContentType("application/x-msdownload");
    		response.setContentType(" application/x-xls;charset=uft-8");
    		response.setContentType("application/octet-stream");
    	 	response.setHeader("Content-disposition","attachment; filename=" + URLEncoder.encode(filename,"utf-8")); 
    		
    	 	java.io.FileInputStream in = null;     
    	 	java.io.BufferedInputStream binpu = null;  
    	 	java.io.BufferedOutputStream bout = null; 
    	 	   
    	 	OutputStream output = null;
    		output = response.getOutputStream();
    		File file = new File(filepath);
    		if(file.isDirectory()){//如果传入的是文件的目录，则添加文件名称
    			filepath+= filename;
    		}
    		if(filepath.startsWith("ftp://"))//如果是ftp,则用FTP下载
    		{
    			FTPHelper ftp = new FTPHelper();
    			String serverFile = ftp.parseFTPAddress(filepath);
    	       	ftp.get(serverFile, output);
    	        output.flush();	
    	        
    		}else{
    			FileInputStream fis = null;
    			try{
    				
    				in = new java.io.FileInputStream(filepath);     
    			    binpu = new java.io.BufferedInputStream(in);  
    			    bout = new java.io.BufferedOutputStream(response.getOutputStream());         
    			    byte[] b = new byte[1024];   
    			    
    				int i = 0;
    			    while((i = binpu.read(b,0,b.length)) > 0){     
    			        bout.write(b, 0, i);     
    			    }         
    			    bout.flush();   
    			    //要加以下两句话，否则会报错      
    			    response.flushBuffer();  
    			}catch(Exception e){
    				e.printStackTrace();
    		 	}
    			finally{
    				if(fis != null){
    					fis.close();
    		 	  		fis = null;
    		 	  	}			
    		 	}
    		}
    		if(output != null){
    			output.close();
    			output = null;
    		}