jsp中獲取Servlet讀取的圖片

需求：

經過servlet讀取圖片地址，而後顯示在jsp頁面上

jsp頁面：

 1 <img style="width:240px; height:200px;" src="<%=request.getContextPath()%>/chartServlet"> 

wel.xml 配置：

1 <servlet>
2         <servlet-name>chartServlet</servlet-name>
3         <servlet-class>com.stronginfo.transenly.website.servlet.chartServlet</servlet-class>
4     </servlet>
5     <servlet-mapping>
6         <servlet-name>chartServlet</servlet-name>
7         <url-pattern>/chartServlet</url-pattern>
8     </servlet-mapping>

java代碼：

 1 package com.stronginfo.transenly.website.servlet;
 2 
 3 import java.io.FileInputStream;
 4 import java.io.IOException;
 5 
 6 import javax.servlet.ServletException;
 7 import javax.servlet.ServletOutputStream;
 8 import javax.servlet.http.HttpServlet;
 9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11 
12 import com.stronginfo.core.dao.OrderDao;
13 import com.stronginfo.transenly.util.ConfigManager;
14 
15 public class chartServlet extends HttpServlet
16 {
17 
18     private static final long serialVersionUID = 1L;
19 
20    
21     
22 
23     public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
24     {
25 
26     
27         ServletOutputStream outStream = res.getOutputStream();// 獲得向客戶端輸出二進制數據的對象
28         FileInputStream fis = new FileInputStream(圖片路徑); // 以byte流的方式打開文件
29         // 讀數據
30         byte data[] = new byte[1000];
31         while (fis.read(data) > 0)
32         {
33             outStream.write(data);
34         }
35         fis.close();
36         res.setContentType("image/*"); // 設置返回的文件類型
37         outStream.write(data); // 輸出數據
38 
39         outStream.close();
40 
41     }
42 
43 }