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【Java】实现简单汉字验证码

作者:小蘑菇炖小鸡 / 发布于2015/2/15/ 525


	import java.awt.Color;
	import java.awt.Font;
	import java.awt.Graphics;
	import java.awt.image.BufferedImage;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.util.Random;
	
	import javax.imageio.ImageIO;
	import javax.servlet.ServletException;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;
	import javax.servlet.http.HttpSession;
	
	
	public class ChineseCheckCode extends HttpServlet {
	
	
	
	 public void doGet(HttpServletRequest request, HttpServletResponse response)
	 throws ServletException, IOException {
	
	 this.doPost(request, response);
	 }
	
	
	 public void doPost(HttpServletRequest request, HttpServletResponse response)
	 throws ServletException, IOException {
	 request.setCharacterEncoding("utf-8");
	 response.setContentType("text/html;charset=utf-8");
	
	 response.setContentType("image/jpeg");
	 response.setDateHeader("expries", -1);
	 response.setHeader("Cache-Control", "no-cache");
	 response.setHeader("Pragma", "no-cache");
	 int width=166;
	 int height = 80;
	 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
	 Graphics g=image.getGraphics();
	 Random randome = new Random();
	 Font myFont = new Font("宋体",Font.ITALIC,26);
	 g.fillRect(0, 0, width, height);
	 g.setFont(myFont);
	 String sRand = "";
	 String ctmp = "";
	 String itmp = "";
	 for(int i=0;i<4;i++){
	
	 String[] rBase={"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};
	 int r1=randome.nextInt(3)+11;
	 String str_r1=rBase[r1];
	 int r2;
	 if(r1==13){
	 r2=randome.nextInt(7);
	 }else{
	 r2=randome.nextInt(16);
	 }
	 String str_r2=rBase[r2];
	 int r3=randome.nextInt(6)+10;
	 String str_r3=rBase[r3];
	 int r4;
	 if(r3==10){
	 r4=randome.nextInt(15)+1;
	 }else if(r3==15){
	 r4=randome.nextInt(15);
	 }else{
	 r4=randome.nextInt(16);
	 }
	 String str_r4=rBase[r4];
	 byte[] bytes = new byte[2];
	 String r12=str_r1+str_r2;
	 int tempLow=Integer.parseInt(r12, 16);
	 bytes[0]=(byte) tempLow;
	 String r34=str_r3+str_r4;
	 int tempHeigh=Integer.parseInt(r34, 16);
	 bytes[1]=(byte) tempHeigh;
	 ctmp=new String(bytes);
	 sRand+=ctmp;
	 Color color = new Color(20+randome.nextInt(110));
	 g.setColor(color);
	 g.drawString(ctmp, width/6*i+23, height/3);
	
	 }
	 HttpSession session=request.getSession(true);
	 session.setAttribute("randCheckCode", sRand);
	 g.dispose();
	 ImageIO.write(image, "JPEG", response.getOutputStream());
	 }
	
	
	
	
	}

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