java web 输出随机验证码
2018-01-12 17:58
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package cn.qust.demo1;
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.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class YanZhengMa
*/
@WebServlet("/YanZhengMa")
public class YanZhengMa extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage img = new BufferedImage(120,25,BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
//1.设置背景色
setBackground(g);
//2.设置边框
setBorder(g);
//3.画干扰线
drawRandomLine(g);
//4.写随机数
drawRandomNumber(g);
//5.图形输出到浏览器
response.setContentType("image/jpeg");
ImageIO.write(img, "jpg", response.getOutputStream());
}
//u4e00-u9fa5
private void drawRandomNumber(Graphics g) {
g = (Graphics2D)g;
g.setColor(Color.RED);
g.setFont(new Font("宋体",Font.BOLD,20));
int x=10;
for(int i=0;i<4;i++) {
int degree = new Random().nextInt(30);
String str = new Random().nextInt(9)+"";
((Graphics2D) g).rotate(degree*Math.PI/180,x,20);//设置旋转角度
g.drawString(str, x, 20);
((Graphics2D) g).rotate(-degree*Math.PI/180,x,20);
x+=30;
}
}
private void drawRandomLine(Graphics g) {
g.setColor(Color.GREEN);
for(int i=0;i<5;i++) {
int x1 = new Random().nextInt(119)+1;
int y1 = new Random().nextInt(24)+1;
g.drawOval(x1, y1,5, 5);
}
}
private void setBorder(Graphics g) {
g.setColor(Color.BLUE);
g.drawRect(1, 1, 118, 23);
}
private void setBackground(Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0, 0, 120, 25);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, 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.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class YanZhengMa
*/
@WebServlet("/YanZhengMa")
public class YanZhengMa extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BufferedImage img = new BufferedImage(120,25,BufferedImage.TYPE_INT_RGB);
Graphics g = img.getGraphics();
//1.设置背景色
setBackground(g);
//2.设置边框
setBorder(g);
//3.画干扰线
drawRandomLine(g);
//4.写随机数
drawRandomNumber(g);
//5.图形输出到浏览器
response.setContentType("image/jpeg");
ImageIO.write(img, "jpg", response.getOutputStream());
}
//u4e00-u9fa5
private void drawRandomNumber(Graphics g) {
g = (Graphics2D)g;
g.setColor(Color.RED);
g.setFont(new Font("宋体",Font.BOLD,20));
int x=10;
for(int i=0;i<4;i++) {
int degree = new Random().nextInt(30);
String str = new Random().nextInt(9)+"";
((Graphics2D) g).rotate(degree*Math.PI/180,x,20);//设置旋转角度
g.drawString(str, x, 20);
((Graphics2D) g).rotate(-degree*Math.PI/180,x,20);
x+=30;
}
}
private void drawRandomLine(Graphics g) {
g.setColor(Color.GREEN);
for(int i=0;i<5;i++) {
int x1 = new Random().nextInt(119)+1;
int y1 = new Random().nextInt(24)+1;
g.drawOval(x1, y1,5, 5);
}
}
private void setBorder(Graphics g) {
g.setColor(Color.BLUE);
g.drawRect(1, 1, 118, 23);
}
private void setBackground(Graphics g) {
g.setColor(Color.WHITE);
g.fillRect(0, 0, 120, 25);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
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