readproductphoto.java

struts+spring+hibernate例子

package com.shop.servlet;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.shop.entity.Photo;
import com.shop.dao.PhotoDAO;


import java.sql.Blob;

public class ReadProductPhoto extends HttpServlet {
	
	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		int productid = Integer.parseInt(request.getParameter("id"));
		int photoid = Integer.parseInt(request.getParameter("pid"));

		response.setContentType("image/jpeg");
		ServletOutputStream out = response.getOutputStream();
		PhotoDAO pdao = new PhotoDAO();
		Photo p = pdao.findByIds(productid, photoid);
		Blob blob = p.getImage();
		if (blob == null) {
			blob = pdao.findById(3).getImage();
		}

		try {
			out.write(blob.getBytes(1, (int) blob.length()));
		} catch (SQLException e) {
			e.printStackTrace();
		}

	}
}