如何在jsp頁面顯示儲存在資料庫的圖片

標籤：throws   jsp   request   stream   pack   ons   private   static   bsp   

 

1.從資料庫中尋找圖片的位元據,把尋找出來的資料set到會話中

　　request.getSession().setAttribute("img",圖片的位元據 );

 

2.把資料write到流裡

 1 package cn.jbit.auction.web.servlet; 2  3 import java.io.IOException; 4  5 import javax.servlet.ServletException; 6 import javax.servlet.http.HttpServlet; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 public class ShowImgServlet extends HttpServlet {11     private static final long serialVersionUID = 306275585861980357L;12     public void doGet(HttpServletRequest request, HttpServletResponse response)13             throws ServletException, IOException {14         doPost(request, response);15     }16 17     public void doPost(HttpServletRequest request, HttpServletResponse response)18             throws ServletException, IOException {19         byte[] imgBytes = (byte[]) request.getSession().getAttribute("img");20         response.getOutputStream().write(imgBytes);21     }22 }

 

3. 更改web.xml檔案的配置 (修改<url-pattern>的參數)

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

 

4.在jsp頁面顯示

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

如何在jsp頁面顯示儲存在資料庫的圖片