您好,登錄后才能下訂單哦!
package com.sys.web.sesoion;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.http.HttpSession;
public class CheckCodeServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
BufferedImage image = new BufferedImage(50,25,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.drawString(Token.getNum(),15,15);
ImageIO.write(image,"JPG",response.getOutputStream());
response.setHeader("expires","-1");
response.setHeader("cache-control","no-cache"); //沒有緩成
response.setHeader("pragma","no-cache");
}
}
//用于產(chǎn)生隨機(jī)數(shù)
class Token{
public static String getNum(){
Random r = new Random();
int num = r.nextInt(10000);
return num + "";
}
}
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。