读取过程 硬盘文件项工厂 Servlet文件上传 文件项迭代器 文件项流 输入流 连接数据库 加载驱动类 获取connection对象 拼写预处理语句，生成预处理 对象preparedStatement 执行
　　package Servlet;
　　import java.io.IOException;
　　import java.io.InputStream;
　　import java.sql.Connection;
　　import java.sql.DriverManager;
　　import java.sql.PreparedStatement;
　　import javax.servlet.ServletException;
　　import javax.servlet.http.HttpServlet;
　　import javax.servlet.http.HttpServletRequest;
　　import javax.servlet.http.HttpServletResponse;
　　import org.apache.commons.fileupload.FileItemIterator;
　　import org.apache.commons.fileupload.disk.DiskFileItemFactory;
　　import org.apache.commons.fileupload.servlet.ServletFileUpload;
　　/**
　　* Servlet implementation class ImageServlet
　　*/
　　public class ImageServlet extends HttpServlet {
　　private static final long serialVersionUID = 1L;
　　protected void doPost(HttpServletRequest request， HttpServletResponse response) throws ServletException， IOException {
　　// TODO Auto-generated method stub
　　System.out.println(123);
　　try {
　　DiskFileItemFactory factory = new DiskFileItemFactory();
　　ServletFileUpload upload = new ServletFileUpload(factory);
　　FileItemIterator iter = upload.getItemIterator(request);
　　InputStream inputStream = iter.next().openStream();
　　Class.forName("com.mysql.jdbc.Driver");
　　Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/Demos"，"root"，"1a");
　　String sql = "insert into image_Demo(image) values (?)";
　　PreparedStatement ps = conn.prepareStatement(sql);
　　ps.setBinaryStream(1， inputStream， inputStream.available());
　　ps.execute();              
　　} catch (Exception e) {
　　// TODO Auto-generated catch block
　　e.printStackTrace();
　　}
　　}
　　}