Servlet中上传下载模板代码

墨蓝 2021-09-15 17:14 309阅读 0赞

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    		try {
       		
    			//上传文件
    			//1.创建文件工厂
    			DiskFileItemFactory factory = new DiskFileItemFactory();
    			//2.创建文件上传的核心类
    			ServletFileUpload servletFileUpload = new ServletFileUpload(factory);
    	
    //			servletFileUpload.setSizeMax(1);//设置整个form表单提交的大小
    //			servletFileUpload.setFileSizeMax(1024*1024*2);//设置单个文件的大小	
    			//3.判断当前的request是否是文件上传的格式
    			if(servletFileUpload.isMultipartContent(request)) {
       		
    				//4.解析当前的request为文件上传的request
    				List<FileItem> list = servletFileUpload.parseRequest(request);			
    				//5.遍历list集合，处理FileItem
    				for (FileItem fileItem : list) {
       				
    					//6.判断当前的fileItem是否是普通表单域
    					if(fileItem.isFormField()) {
       				
    						String fieldName = fileItem.getFieldName();//表单域的name属性的值
    						String value = fileItem.getString("UTF-8");
    						System.out.println(fieldName+"---"+value);							
    					}else {
    						
    //						String contentType = fileItem.getContentType();
    //						System.out.println(contentType);
    						//7.不是普通域就是文件域
    						String fieldName = fileItem.getFieldName();//
    						String name = fileItem.getName();//上传文件的名称
    						name=UUID.randomUUID().toString().replaceAll("-", "")+"_"+name;
    						//System.out.println(fieldName+"---"+name);
    						String realPath = "F:\\wrokimage";
    						File file = new File(realPath);
    						if(!file.exists()) {
    							file.mkdir();	
    						}					
    						fileItem.write(new File(file, name));//就可将当前的文件存储到你指定的地方				
    					}			
    				}								
    			}			
    		} catch (Exception e) {
    			// TODO: handle exception
    			e.printStackTrace();
    		}		
    	}