commons.fileupload 文件上传

编辑jsp页面获取文件

 <html>

   <head>

     <base href="<%=basePath%>">

     <title>My JSP 'upload.jsp' starting page</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

     <meta http-equiv="description" content="This is my page">

     <!--

     <link rel="stylesheet" type="text/css" href="styles.css">

     -->

   </head>

   <body>

     <form action="upload1" method="post" enctype="Multipart/form-data">

         file:<input type="file" name="upload">

         <input type="submit" value="上传">

     </form>

   </body>

 </html>

servlet上传：

 import java.io.File;

 import java.io.IOException;

 import java.io.PrintWriter;

 import java.util.List;

 import java.util.UUID;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.MultipartConfig;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.fileupload.FileItem;

 import org.apache.commons.fileupload.FileUploadException;

 import org.apache.commons.fileupload.disk.DiskFileItemFactory;

 import org.apache.commons.fileupload.servlet.ServletFileUpload;

 @WebServlet("/upload1")

 public class Upload1 extends HttpServlet {

     public void doGet(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

             doPost(request, response);

     }

     public void doPost(HttpServletRequest request, HttpServletResponse response)

             throws ServletException, IOException {

         /**

          *    1、创建文件项工厂

          */

         DiskFileItemFactory factory = new DiskFileItemFactory();

         /**

          *    2、创建解析请求 数据的ServletFileUpload对象

          */

         ServletFileUpload upload = new ServletFileUpload(factory);

         try {

         /**

          *   3、解析请求数据 返回FileItem 列表

          */

             List<FileItem> list = upload.parseRequest(request);

         /**

          *   4、解析获取每一个FileItem 对象

          */

             FileItem item = list.get(0);

             //验证当前FileItem  是否是表单字段    如果fales  则取到的是文件

             item.isFormField();

         /**

          *   5、文件名及路径处理

          */

             //处理文件

             String filename= item.getName();

             //截取文件扩展名

             String extName = filename.substring(filename.lastIndexOf("."));

             //生成UUID作为文件名

             String newName= UUID.randomUUID().toString();

             //获取服务器上自定义的存放文件的目录

             String rootPath = request.getSession().getServletContext().getRealPath("/upload");

             //生成完整的文件路径

             String newPath = rootPath+"/"+newName+extName;

             System.out.println(newPath);

         /**

          *      6、文件写入

          */

             item.write(new File(newPath));

         } catch (FileUploadException e) {

             e.printStackTrace();

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

 }

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commons.fileupload 文件上传

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