如何在jsp页面显示存储在数据库的图片

1.从数据库中查找图片的二进制数据,把查找出来的数据set到会话中

　　request.getSession().setAttribute("img",图片的二进制数据 );

2.把数据write到流里

package cn.jbit.auction.web.servlet;

import java.io.IOException;

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

public class ShowImgServlet extends HttpServlet {
    private static final long serialVersionUID = 306275585861980357L;
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        byte[] imgBytes = (byte[]) request.getSession().getAttribute("img");
        response.getOutputStream().write(imgBytes);
    }
}

3. 更改web.xml文件的配置 (修改<url-pattern>的参数)

<servlet-mapping>
　　<servlet-name>ShowImgServlet</servlet-name>
　　<url-pattern>/auctionImg.jpg</url-pattern>
</servlet-mapping>

4.在jsp页面显示

　　<img src="<%=path %>/auctionImg.jpg" width="270" height="185" alt="图片" />