Servlet返回验证码

Web.xml文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

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">

<servlet>

<description>This is the description of my J2EE component</description>

<display-name>This is the display name of my J2EE component</display-name>

<servlet-name>GetCheckCode</servlet-name>

<servlet-class>GetCheckCode</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>GetCheckCode</servlet-name>

<url-pattern>/checkcode</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

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();

}

}

Servlet返回验证码