web 文件上传 


<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
	<form action="/WEB32/fileuploadServlet2" method="post" enctype="multipart/form-data">
		<input type="text" name="username"><br>
		<input type="file" name="filename"><br>
		<input type="submit" value="上传文件">
	</form>
</body>
</html>

　

后台　

使用方便快捷的文件上传的工具---Apache Commons-fileupload.jar

链接： https://pan.baidu.com/s/1iabtehjJJcdZtgdRQNI1lw

 提取码：ndnw 

 

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        
        try {
            //接受上传文件
            
            //1、创建磁盘文件项工厂
            DiskFileItemFactory factory = new DiskFileItemFactory();
            //2、创建文件上传的核心类
            ServletFileUpload upload = new ServletFileUpload(factory);
            
            //3、解析request---获得文件项集合
            List<FileItem> parseRequest = upload.parseRequest(request);

            //4、遍历文件项集合
            for(FileItem item : parseRequest){
                //5、判断普通表单项/文件上传项
                boolean formField = item.isFormField();//是否是一个普通表单项
                if(formField){
                    //普通表单项
                    String fieldName = item.getFieldName();
                    String fieldValue = item.getString();
                    System.out.println(fieldName+":"+fieldValue);
                }else{
                    //文件上传项
                    //获得上传文件的名称
                    String fileName = item.getName();
                    //获得上传文件的内容
                    InputStream in = item.getInputStream();
                    //将in中的数据拷贝服务器上
                    String path = this.getServletContext().getRealPath("upload");
                    OutputStream out = new FileOutputStream(path+"/"+fileName);
                    int len = 0;
                    byte[] buffer = new byte[1024];
                    while((len=in.read(buffer))>0){
                        out.write(buffer, 0, len);
                    }
                    
                    in.close();
                    out.close();
                }
            }
            
            
        } catch (FileUploadException e) {
            e.printStackTrace();
        }
        
        
        
        
    }

 

posted @ 2019-05-10 17:07  xing001  阅读(215)  评论(0)  编辑  收藏  举报