Servlet生成图片

package jp.co.medieight.medinet.common;

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ImageSealServlet extends HttpServlet ...{

    public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException ...{

        try ...{
            FileInputStream hFile = new FileInputStream(req.getSession().getAttribute("sealUrl").toString()); // 以byte流的方式打?文件
                                                                        // d:.gif
            int i = hFile.available(); // 得到文件大小
            byte data[] = new byte[i];
            hFile.read(data); // 读数据
            hFile.close();
            res.setContentType("image/*"); // 设置返回的文件?型
            OutputStream toClient = res.getOutputStream(); // 得到向客二端数出二?制数据的?象
            toClient.write(data); // 输出数据
            toClient.close();
        } catch (IOException e) // 错误处理
        ...{
            PrintWriter toClient = res.getWriter(); // 得到向客文端对出文本的?象
            res.setContentType("text/html;charset=UTF-8");
            toClient.write("");
            toClient.close();
        }

    }

}

 

web.xml配置

 

    <servlet>
      <servlet-name>textintoimage</servlet-name>
      <servlet-class>jp.co.medieight.medinet.common.ImageSealServlet</servlet-class>
    </servlet>
    <servlet-mapping>
      <servlet-name>textintoimage</servlet-name>
      <url-pattern>/Image</url-pattern>
    </servlet-mapping> 

 

<img src="/Medinet/Image"/>