springmvc的实现原理,要求用图形和文字的形式展现,不知道是哪个图啊,spring主页上应该有,但是太多了。
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哥们这样的问题连一分也不给啊?给你控制层的代码,自己往jsp里传值吧。
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
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;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/checkCodeAction/")
public class CheckCode extends HttpServlet {
public CheckCode() {
super();
}
public void destroy() {
super.destroy();
}
public void init() throws ServletException {
super.init();
}
public Color getRandColor(int s, int e) {
Random random = new Random();
if (s > 255) s = 255;
if (e > 255) e = 255;
int r = s + random.nextInt(e - s);
int g = s + random.nextInt(e - s);
int b = s + random.nextInt(e - s);
return new Color(r, g, b);
}
@RequestMapping("service.do")
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//禁止缓存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "No-cache");
response.setDateHeader("Expires", 0);
// 指定生成的响应是图片
response.setContentType("image/jpeg");
int width = 200;
int height = 60;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB); //创建BufferedImage类的对象
Graphics g = image.getGraphics(); //创建Graphics类的对象
Graphics2D g2d=(Graphics2D)g; //通过Graphics类的对象创建一个Graphics2D类的对象
Random random = new Random(); //实例化一个Random对象
Font mFont = new Font("华文宋体", Font.BOLD, 30); //通过Font构造字体
g.setColor(getRandColor(200, 250)); //改变图形的当前颜色为随机生成的颜色
g.fillRect(0, 0, width , height); //绘制一个填色矩形
//画一条折线
BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //创建一个供画笔选择线条粗细的对象
g2d.setStroke(bs); //改变线条的粗细
g.setColor(Color.DARK_GRAY); //设置当前颜色为预定义颜色中的深灰色
int[] xPoints=new int[3];
int[] yPoints=new int[3];
for(int j=0;j<3;j++){
xPoints[j]=random.nextInt(width - 1);
yPoints[j]=random.nextInt(height - 1);
}
g.drawPolyline(xPoints, yPoints,3);
//生成并输出随机的验证文字
g.setFont(mFont);
String sRand="";
int itmp=0;
for(int i=0;i<4;i++){
if(random.nextInt(2)==1){
itmp=random.nextInt(26)+65; //生成A~Z的字母
}else{
itmp=random.nextInt(10)+48; //生成0~9的数字
}
char ctmp=(char)itmp;
sRand+=String.valueOf(ctmp);
Color color=new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110));
g.setColor(color);
/****随机缩放文字并将文字旋转指定角度**/
//将文字旋转指定角度
Graphics2D g2d_word=(Graphics2D)g;
AffineTransform trans=new AffineTransform();
trans.rotate(random.nextInt(45)*3.14/180,15*i+10,7);
//缩放文字
float scaleSize=random.nextFloat()+0.8f;
if(scaleSize>1.1f) scaleSize=1f;
trans.scale(scaleSize, scaleSize);
g2d_word.setTransform(trans);
/************************/
g.drawString(String.valueOf(ctmp),30*i+40,16);
}
//将生成的验证码保存到Session中
HttpSession session=request.getSession(true);
session.setAttribute("randCheckCode",sRand);
g.dispose();
ImageIO.write(image,"JPEG",response.getOutputStream());
}
}
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
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;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping("/checkCodeAction/")
public class CheckCode extends HttpServlet {
public CheckCode() {
super();
}
public void destroy() {
super.destroy();
}
public void init() throws ServletException {
super.init();
}
public Color getRandColor(int s, int e) {
Random random = new Random();
if (s > 255) s = 255;
if (e > 255) e = 255;
int r = s + random.nextInt(e - s);
int g = s + random.nextInt(e - s);
int b = s + random.nextInt(e - s);
return new Color(r, g, b);
}
@RequestMapping("service.do")
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//禁止缓存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "No-cache");
response.setDateHeader("Expires", 0);
// 指定生成的响应是图片
response.setContentType("image/jpeg");
int width = 200;
int height = 60;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB); //创建BufferedImage类的对象
Graphics g = image.getGraphics(); //创建Graphics类的对象
Graphics2D g2d=(Graphics2D)g; //通过Graphics类的对象创建一个Graphics2D类的对象
Random random = new Random(); //实例化一个Random对象
Font mFont = new Font("华文宋体", Font.BOLD, 30); //通过Font构造字体
g.setColor(getRandColor(200, 250)); //改变图形的当前颜色为随机生成的颜色
g.fillRect(0, 0, width , height); //绘制一个填色矩形
//画一条折线
BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //创建一个供画笔选择线条粗细的对象
g2d.setStroke(bs); //改变线条的粗细
g.setColor(Color.DARK_GRAY); //设置当前颜色为预定义颜色中的深灰色
int[] xPoints=new int[3];
int[] yPoints=new int[3];
for(int j=0;j<3;j++){
xPoints[j]=random.nextInt(width - 1);
yPoints[j]=random.nextInt(height - 1);
}
g.drawPolyline(xPoints, yPoints,3);
//生成并输出随机的验证文字
g.setFont(mFont);
String sRand="";
int itmp=0;
for(int i=0;i<4;i++){
if(random.nextInt(2)==1){
itmp=random.nextInt(26)+65; //生成A~Z的字母
}else{
itmp=random.nextInt(10)+48; //生成0~9的数字
}
char ctmp=(char)itmp;
sRand+=String.valueOf(ctmp);
Color color=new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110));
g.setColor(color);
/****随机缩放文字并将文字旋转指定角度**/
//将文字旋转指定角度
Graphics2D g2d_word=(Graphics2D)g;
AffineTransform trans=new AffineTransform();
trans.rotate(random.nextInt(45)*3.14/180,15*i+10,7);
//缩放文字
float scaleSize=random.nextFloat()+0.8f;
if(scaleSize>1.1f) scaleSize=1f;
trans.scale(scaleSize, scaleSize);
g2d_word.setTransform(trans);
/************************/
g.drawString(String.valueOf(ctmp),30*i+40,16);
}
//将生成的验证码保存到Session中
HttpSession session=request.getSession(true);
session.setAttribute("randCheckCode",sRand);
g.dispose();
ImageIO.write(image,"JPEG",response.getOutputStream());
}
}
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