Web.xml文件

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

This is the description of my J2EE component

This is the display name of my J2EE component

GetCheckCode

GetCheckCode

GetCheckCode

/checkcode

index.jsp

Servlet文件

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.IOException;

import java.io.OutputStream;

import javax.imageio.ImageIO;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class GetCheckCode extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doPost(request, response);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("image/JPEG");

int width=80;

int height=15;

BufferedImage bi=new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);

Graphics g=bi.getGraphics();

g.drawString("hello",15,9);

g.dispose();

OutputStream os=response.getOutputStream();

ImageIO.write(bi, "JPEG",os);

os.flush();

os.close();

}

}

原文：http://www.cnblogs.com/gdds/p/3836593.html

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