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如何使用servlet和jsp将文件插入java中的数据库

java jsp servlets

如何使用servlet和jsp将文件插入java中的数据库,java,jsp,servlets,Java,Jsp,Servlets,如何使用servlet和jsp将文件插入数据库 帮助我将文件插入数据库 1.Servlet文件 2.jsp文件 在此处插入标题 ${message} 姓名： 选择文件： 我在'filePart'中获取空值，如何从jsp获取文件值以插入数据库表单应具有enctype=“multipart/form data”。可能存在重复的 package FileUpload; import java.io.IOException; import java.io.InputStr

如何使用servlet和jsp将文件插入数据库 帮助我将文件插入数据库

1.Servlet文件
2.jsp文件 

在此处插入标题
${message}
姓名：
选择文件：
我在'filePart'中获取空值，如何从jsp获取文件值以插入数据库

表单应具有
enctype=“multipart/form data”
。可能存在重复的 
    package FileUpload;

    import java.io.IOException;
    import java.io.InputStream;
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.SQLException;

    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.Part;

    public class UploadImage extends HttpServlet {
      @Override
      protected void doGet(HttpServletRequest req, HttpServletResponse resp)
              throws ServletException, IOException {

          RequestDispatcher rd=req.getServletContext().getRequestDispatcher("/jsp/upload.jsp");
          rd.forward(req, resp);
      }
      @Override
      protected void doPost(HttpServletRequest req, HttpServletResponse resp)
              throws ServletException, IOException {

          String name=req.getParameter("name");

          InputStream in=null;
          Part filePart=req.getPart("photo");
          if(filePart!=null){
              System.out.println(filePart.getName());
                System.out.println(filePart.getSize());
                System.out.println(filePart.getContentType());
                in=filePart.getInputStream();

          }
          ConnectionUtil cu=new ConnectionUtil();
          Connection conn =cu.getConnection();

          String sql = "insert into upload(name,photo)values(?, ?)";
          try {
              PreparedStatement pt = conn.prepareStatement(sql);
                  pt.setString(1,name);
                  pt.setBlob(2,in);               

              int row = pt.executeUpdate();
                if (row > 0) {
                    req.setAttribute("message", "File uploaded and saved into database");
                }
              RequestDispatcher rd=req.getServletContext().getRequestDispatcher("/jsp/upload.jsp");
              rd.forward(req, resp);  
          } catch (SQLException e) {
              e.printStackTrace();
          }       
      }
    }

        <%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="/ram_jsp/upload" method="post">
<table>
<tr><td>${message}</td></tr>
<tr><td>Name :</td><td><input type="text" name="name"></td></tr>
<tr><td>Choose File:</td><td><input type="file" name="photo" size="100"></td></tr>
<tr><td><input type="submit" value="Upload">
</table>
</form>
</body>
</html>