The code copy is as follows:
package com.sanrong;
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;
/**
* Create picture verification code
* Using API --- bufferedImage
* @author SSA
*/
public class test4Pic extends HttpServlet {
//Define the length and width of the constant
private static final int WIDTH =130;
private static final int HEIGHT =30;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//Get a background container This method returns a Graphics2D, but is here for backwards compatibility.
BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
//Create a Graphics2D, which can be used to draw into this BufferedImage.
Graphics graphics = image.getGraphics();
//Set background
setBackGround(graphics);
//Set border
setBorder(graphics);
//Draw a random line
drawRandomLine(graphics);
//Draw a random number
drawRandomNum((Graphics2D) graphics);
//Notify that the browser returns the image so the memetype type is query in tomcat configuration.
response.setContentType("image/jpeg");
ImageIO.write(image, "jpg", response.getOutputStream());
}
private void drawRandomNum(Graphics2D graphics) {
// Write random numbers
graphics.setColor(Color.BLUE);
graphics.setFont(new Font("宋体", Font.BOLD,20));
//But there are many rare words in it, which need to be filtered and selected common Chinese
String base="/u7684/u4e00/u4e86/u662f/u6211/u4e0d/u5728/u4eba/u4eec/u6709/u6765/u4ed6/u8fd9/u4e0a/u7740/u4e2a/u5730/u5230/u5927/u91cc/u8bf4/u5c31/u53bb/ u5b50/u5f97/u4e5f/u548c/u90a3/u8981/u 4e0b/u770b/u5929/u65f6/u8fc7/u51fa/u5c0f/u4e48/u8d77/u4f60/u90fd/u628a/u597d/u8fd8/u591a/u6ca1/u4e3a/u53c8/u53ef/u5bb6/u5b66/u53ea/u4ee5/u4e3b/u4f1a/ u6837/u5e74/u60f3/u751f/u540c/u800 1/u4e2d/u5341/u4ece/u81ea/u9762/u524d/u5934/u9053/u5b83/u540e/u7136/u8d70/u5f88/u50cf/u89c1/u4e24/u7528/u5979/u56fd/u52a8/u8fdb/u6210/u56de/u4ec0/ u8fb9/u4f5c/u5bf9/u5f00/u800c/u5df1/u 4e9b/u73b0/u5c71/u6c11/u5019/u7ecf/u53d1/u5de5/u5411/u4e8b/u547d/u7ed9/u957f/u6c34/u51e0/u4e49/u4e09/u58f0/u4e8e/u9ad8/u624b/u77e5/u7406/u773c/u5fd7/ u70b9/u5fc3/u6218/u4e8c/u95ee/u4f4 6/u8eab/u65b9/u5b9e/u5403/u505a/u53eb/u5f53/u4f4f/u542c/u9769/u6253/u5462/u771f/u5168/u624d/u56db/u5df2/u6240/u654c/u4e4b/u6700/u5149/u4ea7/u60c5/ u8def/u5206/u603b/u6761/u767d/u8bdd/ u4e1c/u5e2d/u6b21/u4eb2/u5982/u88ab/u82b1/u53e3/u653e/u513f/u5e38/u6c14/u4e94/u7b2c/u4f7f/u5199/u519b/u5427/u6587/u8fd0/u518d/u679c/u600e/u5b9a/u8bb8/ u5feb/u660e/u884c/u56e0/u522b/u98 de/u5916/u6811/u7269/u6d3b/u90e8/u95e8/u65e0/u5f80/u8239/u671b/u65b0/u5e26/u961f/u5148/u529b/u5b8c/u5374/u7ad9/u4ee3/u5458/u673a/u66f4/u4e5d/u60a8/ u6bcf/u98ce/u7ea7/u8ddf/u7b11/u554a/ u5b69/u4e07/u5c11/u76f4/u610f/u591c/u6bd4/u9636/u8fde/u8f66/u91cd/u4fbf/u6597/u9a6c/u54ea/u5316/u592a/u6307/u53d8/u793e/u4f3c/u58eb/u8005/u5e72/u77f3/ u6ee1/u65e5/u51b3/u767e/u539f/u62 ff/u7fa4/u7a76/u5404/u516d/u672c/u601d/u89e3/u7acb/u6cb3/u6751/u516b/u96be/u65e9/u8bba/u5417/u6839/u5171/u8ba9/u76f8/u7814/u4eca/u5176/u4e66/u5750/ u63a5/u5e94/u5173/u4fe1/u89c9/u6b65 /u53cd/u5904/u8bb0/u5c06/u5343/u627e/u4e89/u9886/u6216/u5e08/u7ed3/u5757/u8dd1/u8c01/u8349/u8d8a/u5b57/u52a0/u811a/u7d27/u7231/u7b49/u4e60/u9635/u6015 /u6708/u9752/u534a/u706b/u6cd5/u9 898/u5efa/u8d76/u4f4d/u5531/u6d77/u4e03/u5973/u4efb/u4ef6/u611f/u51c6/u5f20/u56e2/u5c4b/u79bb/u8272/u8138/u7247/u79d1/u5012/u775b/u5229/u4e16/u521a/ u4e14/u7531/u9001/u5207/u661f/u5bfc /u665a/u8868/u591f/u6574/u8ba4/u54cd/u96ea/u6d41/u672a/u573a/u8be5/u5e76/u5e95/u6df1/u523b/u5e73/u4f1f/u5fd9/u63d0/u786e/u8fd1/u4eae/u8f7b/u8bb2/u519c /u53e4/u9ed1/u544a/u754c/u62c9/u5 40d/u5440/u571f/u6e05/u9633/u7167/u529e/u53f2/u6539/u5386/u8f6c/u753b/u9020/u5634/u6b64/u6cbb/u5317/u5fc5/u670d/u96e8/u7a7f/u5185/u8bc6/u9a8c/u4f20/ u4e1a/u83dc/u722c/u7761/u5174/u5f6 2/u91cf/u54b1/u89c2/u82e6/u4f53/u4f17/u901a/u51b2/u5408/u7834/u53cb/u5ea6/u672f/u996d/u516c/u65c1/u623f/u6781/u5357/u67aa/u8bfb/u6c99/u5c81/u7ebf/ u91ce/u575a/u7a7a/u6536/u7b97/u81f3/u 653f/u57ce/u52b3/u843d/u94b1/u7279/u56f4/u5f1f/u80dc/u6559/u70ed/u5c55/u5305/u6b4c/u7c7b/u6e10/u5f3a/u6570/u4e61/u547c/u6027/u97f3/u7b54/u54e5/u9645/ u65e7/u795e/u5ea7/u7ae0/u5e2e/u556 6/u53d7/u7cfb/u4ee4/u8df3/u975e/u4f55/u725b/u53d6/u5165/u5cb8/u6562/u6389/u5ffd/u79cd/u88c5/u9876/u6025/u6797/u505c/u606f/u53e5/u533a/u8863/u822c/ u62a5/u53f6/u538b/u6162/u53d4/u80cc";
int x =10;
for (int i = 0; i < 4; i++) {
//Get four random Chinese characters. Unicode interval of Chinese characters: [/u4e00-/u9fa5]
String ch = base.charAt(new Random().nextInt(base.length()))+"";
//Set the rotation angle 0 -30 degrees (divided by 30, the remainder will not be greater than 30)
int degree = new Random().nextInt()%30;
//The rotation angle of the text*3.14/180 = radian
graphics.rotate(degree*Math.PI/180,x,23);
graphics.drawString(ch, x, 23);
//Clear the rotation angle
graphics.rotate(-degree*Math.PI/180,x,23);
x=x+30;
}
}
private void drawRandomLine(Graphics graphics) {
// Draw random lines
graphics.setColor(Color.MAGENTA);
for (int i = 0; i < 5; i++) {
/**
* Returns a pseudorandom, uniformly distributed {@code int} value
* between 0 (inclusive) and the specified value (exclusive)
*/
int x1= new Random().nextInt(WIDTH);
int y1= new Random().nextInt(HEIGHT);
int x2= new Random().nextInt(WIDTH);
int y2= new Random().nextInt(HEIGHT);
graphics.drawLine(x1, y1, x2, y2);
}
}
private void setBackGround(Graphics graphics) {
// Set color: pink
graphics.setColor(Color.PINK);
graphics.fillRect(0, 0, WIDTH, HEIGHT);
}
private void setBorder(Graphics graphics) {
// Set borders
graphics.setColor(Color.BLUE);
graphics.drawRect(1, 1, WIDTH-2, HEIGHT-2);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}