Java使用Apache的FileUpload组件进行文件上传

曾经终败给现在 2022-07-12 04:20 167阅读 0赞

### Java使用Apache的FileUpload组件进行文件上传 ###

首先需要导入jar包

> [commons-fileupload-1.3.2.jar][]  
> [commons-io-2.5.ajr][]

### Html代码 ###

<fieldset>
    		<legend>FileUpload文件上传</legend>
    		<form method="post" enctype="multipart/form-data" action="NormalUpload">
    			<label>用户名：<input type="text" name="username" /></label><br /> 
    			<label>文  件：<input type="file" name="file01" /></label><br />
    			<input type="submit" />
    		</form>
    	</fieldset>

### Servlet代码 ###

public class NormalUpload extends HttpServlet { 
    
    	private static final long serialVersionUID = 1L;
    
    	public void doPost(HttpServletRequest request, HttpServletResponse response)
    			throws ServletException, IOException { 
    		
    		// 1.创建工厂类
    		DiskFileItemFactory factory = new DiskFileItemFactory();
    		
    		// 2.创建文件上传核心类
    		ServletFileUpload upload = new ServletFileUpload(factory);
    		
    		// 【设置单文件最大值：5M】
    		upload.setFileSizeMax(5 * 1024 * 1024);
    		
    		// 【设置总文件最大值： 20M】
    		upload.setSizeMax(20 * 1024 * 1024);
    		
    		// 设置编码
    		upload.setHeaderEncoding("utf-8");
    		
    		// 3.判断是否为文件上传表单
    		if (ServletFileUpload.isMultipartContent(request)) { 
    			try { 
    				// 4.遍历表单项
    				@SuppressWarnings("unchecked")
    				List<FileItem> list = upload.parseRequest(request);
    				for (FileItem item : list) { 
    					// 普通表单项
    					if (item.isFormField()) { 
    						String name = item.getFieldName();
    						String value = item.getString("UTF-8");
    						System.out.println(name + " : " + value);
    					} else { // 文件表单项
    						// 文件名
    						String fileName = item.getName();
    						
    						// 生成唯一文件名
    						fileName = UUID.randomUUID().toString() + "#" + fileName;
    						
    						// 获取上传路径：项目目录下的upload文件夹(先创建upload文件夹)
    						String basePath = this.getServletContext().getRealPath("/upload");
    						
    						// 创建文件对象
    						File file = new File(basePath, fileName);
    						
    						// 写文件（保存）
    						item.write(file);
    						
    						// 删除临时文件
    						item.delete();
    					}
    				}
    			} catch (FileUploadException e) { 
    				e.printStackTrace();
    			} catch (Exception e) { 
    				e.printStackTrace();
    			}
    		} else { 
    			response.getWriter().write("cannot deal this request!");
    		}
    	}
    
    }

[commons-fileupload-1.3.2.jar]: http://download.csdn.net/detail/djzhao627/9751565
[commons-io-2.5.ajr]: http://download.csdn.net/detail/djzhao627/9751594