A solution to Java graphics Verification code _java

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Package cn.response;

Import Java.awt.Color;
Import Java.awt.Font;
Import Java.awt.Graphics;
Import Java.awt.Graphics2D;
Import Java.awt.image.BufferedImage;
Import java.io.IOException;
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;

@SuppressWarnings ("Serial")
public class Validatepicture extends HttpServlet {

public void doget (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
try {
Validateimage (request, response);
catch (Exception e) {
E.printstacktrace ();
}
}

public void DoPost (HttpServletRequest request, httpservletresponse response)
Throws Servletexception, IOException {
Doget (request, response);
}

public static final int WIDTH = 120;
public static final int HEIGHT = 25;

public void Validateimage (HttpServletRequest request,
HttpServletResponse response) throws Exception {

BufferedImage bi = new BufferedImage (WIDTH, HEIGHT,
BUFFEREDIMAGE.TYPE_INT_RGB);//Build an image in memory
Graphics g = bi.getgraphics ();

SetBackground (g);/Set Background color
SetBorder (g);//Set border
Drawrandomline (g);//Draw Interference line
String random = Drawrandomnum ((graphics2d) g);//write random number

Request.getsession (). setattribute ("random", random);
Request.getsession (FALSE);
Response.setcontenttype ("Image/jpeg");
Set do not cache
Response.setdateheader ("Expries",-1);
Response.setheader ("Cache-control", "No-cache");

Imageio.write (BI, "JPG", Response.getoutputstream ());
}

Private String Drawrandomnum (graphics2d g) {
G.setcolor (color.red);
G.setfont (New Font ("Song Body", Font.Bold, 20));
[\U4E00-\U9FA5] Chinese digit range
String base = "\u4e00\u4f00\u5e00\u4e50\u4e89\u4f10\u4e09";

StringBuffer sb = new StringBuffer ();

int x = 5;
for (int i = 0; i < 4; i++) {
int degree = new Random (). Nextint ()% 30;

String ch = base.charat (new Random (). Nextint (Base.length ())) + "";
Sb.append (CH);
G.rotate (Degree * math.pi/180, X, 20);
g.DrawString (CH, x, 20);
G.rotate (-degree * math.pi/180, X, 20);

x = x + 30;
}
System.out.println (Sb.tostring ());
return sb.tostring ();
}

private void Drawrandomline (Graphics g) {
G.setcolor (Color.green);
for (int i = 0; i < 3; i++) {
int x1 = new Random (). Nextint (WIDTH);
int y1 = new Random (). Nextint (HEIGHT);

int x2 = new Random (). Nextint (WIDTH);
int y2 = new Random (). Nextint (HEIGHT);

G.drawline (x1, y1, x2, y2);
}
}

private void SetBorder (Graphics g) {
G.setcolor (Color.Blue);
G.drawrect (1, 1, WIDTH-2, HEIGHT-2);
}

private void SetBackground (Graphics g) {
G.setcolor (Color.White);
G.fillrect (0, 0, WIDTH, HEIGHT);
}
}