2.生成驗證碼的Controller

Java代碼

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;

import com.google.code.kaptcha.Producer;

/**

* ClassName： CaptchaImageCreateController 《br/》

* Function： 生成驗證碼Controller. 《br/》

* date： 2013-12-10 上午11:37:42 《br/》

*

* @author chenzhou1025@126.com

*/

@Controller

publicclass CaptchaImageCreateController {

private Producer captchaProducer = null;

@Autowired

publicvoid setCaptchaProducer（Producer captchaProducer）{

this.captchaProducer = captchaProducer;

}

@RequestMapping（“/kaptcha.jpg”）

public ModelAndView handleRequest（HttpServletRequest request， HttpServletResponse response） throws Exception{

// Set to expire far in the past.

response.setDateHeader（“Expires”， 0）;

// Set standard HTTP/1.1 no-cache headers.

response.setHeader（“Cache-Control”， “no-store， no-cache， must-revalidate”）;

// Set IE extended HTTP/1.1 no-cache headers （use addHeader）。

response.addHeader（“Cache-Control”， “post-check=0， pre-check=0”）;

// Set standard HTTP/1.0 no-cache header.

response.setHeader（“Pragma”， “no-cache”）;

// return a jpeg

response.setContentType（“image/jpeg”）;

// create the text for the image

String capText = captchaProducer.createText（）;

// store the text in the session

request.getSession（）.setAttribute（Constants.KAPTCHA_SESSION_KEY， capText）;

// create the image with the text

BufferedImage bi = captchaProducer.createImage（capText）;

ServletOutputStream out = response.getOutputStream（）;

// write the data out

ImageIO.write（bi， “jpg”， out）;

try {

out.flush（）;

} finally {

out.close（）;

}

returnnull;

}

}

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;

import com.google.code.kaptcha.Producer;

/**

* ClassName： CaptchaImageCreateController 《br/》

* Function： 生成驗證碼Controller. 《br/》

* date： 2013-12-10 上午11:37:42 《br/》

*

* @author chenzhou1025@126.com

*/

@Controller

public class CaptchaImageCreateController {

private Producer captchaProducer = null;

@Autowired

public void setCaptchaProducer（Producer captchaProducer）{

this.captchaProducer = captchaProducer;

}

@RequestMapping（“/kaptcha.jpg”）

public ModelAndView handleRequest（HttpServletRequest request， HttpServletResponse response） throws Exception{

// Set to expire far in the past.

response.setDateHeader（“Expires”， 0）;

// Set standard HTTP/1.1 no-cache headers.

response.setHeader（“Cache-Control”， “no-store， no-cache， must-revalidate”）;

// Set IE extended HTTP/1.1 no-cache headers （use addHeader）。

response.addHeader（“Cache-Control”， “post-check=0， pre-check=0”）;

// Set standard HTTP/1.0 no-cache header.

response.setHeader（“Pragma”， “no-cache”）;

// return a jpeg

response.setContentType（“image/jpeg”）;

// create the text for the image

String capText = captchaProducer.createText（）;

// store the text in the session

request.getSession（）.setAttribute（Constants.KAPTCHA_SESSION_KEY， capText）;

// create the image with the text

BufferedImage bi = captchaProducer.createImage（capText）;

ServletOutputStream out = response.getOutputStream（）;

// write the data out

ImageIO.write（bi， “jpg”， out）;

try {

out.flush（）;

} finally {

out.close（）;

}

return null;

}

}