基于Servlet的文件上传

素颜马尾好姑娘i 2023-10-05 13:26 8阅读 0赞

## JSP页面 ##

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>$Title$</title>
      </head>
      <body>
      <form action="udServlet" method="post" enctype="multipart/form-data">
       <table>
         <tr>
           <td>文件描述</td>
           <td><input type="text" name="filename"></td>
         </tr>
         <tr>
           <td>选择文件</td>
           <td><input type="file" name="path"></td>
         </tr>
          <tr>
            <td align="right"><input type="reset" value="重传"></td>
            <td><input type="submit" value="上传"></td>
    
          </tr>
       </table>
      </form>
      </body>
    </html>

## MyUtil类 ##

package util;
    
    import javax.servlet.http.Part;
    
    public class MyUtil {
        
        public static String getFilename(Part part){
        
    
            if(part==null)
                return null;
            String fileName=part.getHeader("content-disposition");
    
            if(fileName.lastIndexOf("=")+2==fileName.length()-1)
                return null;
            return fileName.substring(fileName.lastIndexOf("=")+2,fileName.length()-1);
        }
    }

## Servlet代码 ##

package servlet;
    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 javax.servlet.http.Part;
    import java.io.File;
    import java.io.IOException;
    import java.io.PrintWriter;
    import util.MyUtil;
    
    @WebServlet(name = "udServlet",urlPatterns = "/udServlet")
    @MultipartConfig(maxFileSize = 30*1024*1024)
    public class udServlet extends HttpServlet {
        
        private static final long UID=1L;
    
        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
                doGet(request,response);
        }
    
        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
    
            response.setContentType("text/html;charset=utf-8;");
            PrintWriter out=response.getWriter();
            request.setCharacterEncoding("utf-8");
            Part part =request.getPart("path");
            String fs=request.getParameter("filename");
            out.println("script"+fs+"<br>");
            File uploadFileDir=new File(getServletContext().getRealPath("/uploadFiles"));
            if(!uploadFileDir.exists()){
        
                uploadFileDir.mkdir();
            }
    
            String oldName =MyUtil.getFilename(part);
            out.println("oldfilename"+oldName+"<br>");
            out.println("filesize"+part.getSize()+"<br>");
    
            if(oldName!=null){
        
                part.write(uploadFileDir+File.separator+oldName);
            }
                out.println("position"+uploadFileDir+File.separator+oldName+"<br>");
        }
    
    }

![在这里插入图片描述][2020111023333293.png_pic_center]  
![在这里插入图片描述][20201110233402889.png_pic_center]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1ExMzY4MDg5MzIz_size_16_color_FFFFFF_t_70_pic_center]

[2020111023333293.png_pic_center]: https://img-blog.csdnimg.cn/2020111023333293.png#pic_center
[20201110233402889.png_pic_center]: https://img-blog.csdnimg.cn/20201110233402889.png#pic_center
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1ExMzY4MDg5MzIz_size_16_color_FFFFFF_t_70_pic_center]: https://img-blog.csdnimg.cn/20201110233601259.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1ExMzY4MDg5MzIz,size_16,color_FFFFFF,t_70#pic_center