jsp+servlet和SSM分别是如何实现文件上传（示例）

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以下是jsp+servlet和SSM分别是如何实现文件上传的方法示例

两种模式的upload.jsp文件都一样，（注意要加上enctype=“multipart/form-data”）如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>








	

		

			

				
用户名：
				

			
			

				
文件：
				

			
			

				

				

			
		
		
	

传统的jsp+servlet开发实现上传
UploadServlet.java中的doPost()如下：

/**
 * The doPost method of the servlet. 

 *
 * This method is called when a form has its tag value method equals to post.
 * 
 * @param request the request send by the client to the server
 * @param response the response send by the server to the client
 * @throws ServletException if an error occurred
 * @throws IOException if an error occurred
 */
public void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {

	response.setContentType("text/html;chartset=utf-8");
	request.setCharacterEncoding("utf-8");
	// 上传的用户名
	String value = null;
	// 上传的文件名
	String fileName = null;
	// 上传的目标路径
	String filePath = request.getSession().getServletContext().getRealPath("/upload");
	
	// 1.判断表单上传的编码方式
	if(ServletFileUpload.isMultipartContent(request)){
		// 2.创建fileItem工厂
		FileItemFactory factory = new DiskFileItemFactory();
		// 3.创建上传解析对象
		ServletFileUpload sfu = new ServletFileUpload(factory);
		// 4.解析上传的表单
		List fileItemList = null;
		try {
			fileItemList = sfu.parseRequest(request);
		} catch (FileUploadException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		for(FileItem f : fileItemList){
			if(f.isFormField()){// 普通表单元素
				String name = f.getFieldName();
				if(name.equals("username")){
					value = f.getString("utf-8");
				}
			}else{// 文件
				fileName = f.getName();
				File file = new File(filePath + "/" + fileName);
				try {
					f.write(file);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				response.getWriter().print(value + "上传了" + fileName + "已成功！");
			}
			
		}
	}
	
}

SSM框架主要是spring MVC处理器对上传组件进行了封装，使得代码简化了很多
处理器中的处理上传文件的方法如下：

/**
* 文件上传
 *TODO
 *LIU
 * @param request
 * @param response
 * @return
 *上午10:34:15
 */
@RequestMapping("uploadFile.action")
public ModelAndView uploadFile(@RequestParam("uploadfile") CommonsMultipartFile cmf, HttpServletRequest request) throws Exception{
	
	// 接收普通的用户名的话，用参数request来接收
	String uname = request.getParameter("uname");
	String path = "F:\\upload\\" + cmf.getOriginalFilename();
	File file = new File(path);
	
	cmf.transferTo(file);
	
	mav = new ModelAndView("uploadResult.jsp");
	String mess = cmf.getOriginalFilename() + "上传成功了！";
	mav.addObject("mess", mess);
	mav.addObject("uname", uname);
	return mav;
}