Servlet实现图片读取显示-白红宇

Servlet实现图片读取显示

阅读量：4699 次

发布时间：2019-06-09

本文共 3409 字，大约阅读时间需要 11 分钟。

1.导入jar包：commons-io-1.4.jar

2.index.jsp:

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9     10         11 12         文件上传13         
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     21     22 23     24             
     
      查看图片
     
25     26

3.showPic.jsp

1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9     10         11 12         文件上传13         
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      25             
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27     28

4.ShowPictureServlet.java

pacgake com.pearl.util;  1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.IOException; 4 import java.io.OutputStream; 5  6 import javax.servlet.ServletConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest;10 import javax.servlet.http.HttpServletResponse;11 12 public class ShowPictureServlet extends HttpServlet {13 14     public void destroy() {15         super.destroy(); 16     }17 18     public void doGet(HttpServletRequest request, HttpServletResponse response)19             throws ServletException, IOException {20         //文件路径21         String picFolder = "E:/upload/";22         String fileName = request.getParameter("fileName");23         if(fileName!=null && !fileName.equals("")){24             String mimeType = "image/gif";25             //设置content类型26             response.setContentType(mimeType);27             //设置大小28             File file = new File(picFolder + fileName);29             response.setContentLength((int) file.length());30             //打开文件并输出31             FileInputStream inputStream = new FileInputStream(file);32             OutputStream out = response.getOutputStream();33             34             //把文件复制到输出流35             byte[] data = new byte[1024];36             int count = 0;37             while ((count=inputStream.read(data))>=0){38                 out.write(data, 0, count);39             }40             inputStream.close();41             out.close();42         }43     }44 45     public void doPost(HttpServletRequest request, HttpServletResponse response)46             throws ServletException, IOException {47         doGet(request, response);48     }49 50     51     public void init(ServletConfig config) throws ServletException {52         super.init(config);53     }54 55 }

5.web.xml

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       7   
      
        8     
       
        This is the description of my J2EE component
        9     
       
        This is the display name of my J2EE component
       10     
       
        ShowPictureServlet
       11     
       
        com.pearl.util.ShowPictureServlet
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      13   14   
      
       15     
       
        ShowPictureServlet
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        /ShowPictureServlet
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        index.jsp
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