request对象和response对象(4)

p>        BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);

p>        //得到属于该图片的画笔：Graphics();

p>        Graphics g = image.getGraphics();

p>        //画边框

p>        g.setColor(Color.BLUE);

p>        g.drawRect(0, 0, width, height);

p>        //填充背景色

p>        g.setColor(Color.YELLOW);

p>        g.fillRect(1, 1, width-2, height-2);

p>        //画干扰线

p>        g.setColor(Color.GRAY);

p>        Random r = new Random();

p>        for(int i=0; i<10; i++)

p>            g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));

p>        //随机数字

p>        g.setColor(Color.RED);

p>        g.setFont(new Font("宋体",Font.BOLD|Font.ITALIC,20));

p>        int x = 23;

p>        for(int i=0; i<4; i++){

p>            g.drawString(r.nextInt(10)+"", x, 20);

p>            x = x+20;

p>        }

p>        //输出到浏览器的页面上：ImageIO

p>        ImageIO.write(image, "jpg", response.getOutputStream());

p>    }

p> 

p>    public void doPost(HttpServletRequest request, HttpServletResponse response)

p>            throws ServletException, IOException {

p>        doGet(request,response);

p>    }

p>}

p>复制代码

p>4.定时刷新

p> 

p>复制代码

p>package cn.lsl.response;

p> 

p>import java.io.IOException;

p>import java.io.PrintWriter;

p>import java.util.Random;

p>import javax.servlet.ServletException;

p>import javax.servlet.http.HttpServlet;

p>import javax.servlet.http.HttpServletRequest;

p>import javax.servlet.http.HttpServletResponse;

p> 

p>public class ResponseDemo4 extends HttpServlet {

p>    

p>    public void doGet(HttpServletRequest request, HttpServletResponse response)

p>            throws ServletException, IOException {

p>        test2(response);

p>    }

p>    

p>    //定时刷新到自己

p>    private void test1(HttpServletResponse response) throws IOException{

p>        Random r = new Random();

p>        int i = r.nextInt();

p>        response.setIntHeader("Refresh", 1);

p>        response.getOutputStream().write((i+"").getBytes());