第一种方法 全是字母和数字组成
package com.myFirstSpring.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ValidateCodeUtils extends HttpServlet {
private static final long serialVersionUID = -1409007752285164213L;
private static int width = 75;
private static int height = 35;
// private static char[] ch =
// "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789".toCharArray();
private static char[] ch = "abcdefghijklmnopqrstuvwxyz0123456789".toCharArray();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
// 生成数字和字母的验证码
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("image/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
// 在内存中创建图象
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
// 生成随机类
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 设定字体
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
// 画边框
// g.setColor(new Color());
// g.drawRect(0,0,width-1,height-1);
// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}
// 取随机产生的认证码(4位数字)
StringBuffer sb = new StringBuffer();
int index, len = ch.length;
for (int i = 0; i < 4; i++) {
index = random.nextInt(len);
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 28));// 输出的字体和大小
g.drawString("" + ch[index], (i * 15) + 6, 26);// 写什么数字，在图片的什么位置画
sb.append(ch[index]);
}
// 将认证码存入SESSION
request.getSession().setAttribute("piccode", sb.toString());
request.getSession().setAttribute(request.getSession().getId(), sb.toString());
// 图象生效
g.dispose();
ServletOutputStream responseOutputStream = response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG", responseOutputStream);
// 以下关闭输入流！
responseOutputStream.flush();
responseOutputStream.close();
}
protected void ValidateCode(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// 在内存中创建图象
BufferedImage img = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 得到该图片的绘图对象
Graphics g = img.getGraphics();
Random r = new Random();
Color c = new Color(200, 150, 255);
g.setColor(c);
// 填充整个图片的颜色
g.fillRect(0, 0, width, height);
// 向图片中输出数字和字母
StringBuffer sb = new StringBuffer();
int index, len = ch.length;
for (int i = 0; i < 4; i++) {
index = r.nextInt(len);
g
.setColor(new Color(r.nextInt(88), r.nextInt(188), r
.nextInt(255)));
g.setFont(new Font("Arial", Font.BOLD | Font.ITALIC, 22));// 输出的字体和大小
g.drawString("" + ch[index], (i * 15) + 6, 18);// 写什么数字，在图片的什么位置画
sb.append(ch[index]);
}
request.getSession().setAttribute("piccode", sb.toString());
ServletOutputStream responseOutputStream = response.getOutputStream();
ImageIO.write(img, "JPG", responseOutputStream);
responseOutputStream.flush();
responseOutputStream.close();
}
Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
public static String getPath(Class name) {
String strResult = null;
if (System.getProperty("os.name").toLowerCase().indexOf("window") > -1) {
strResult = name.getResource("/").toString().replace("file:/", "")
.replace("%20", " ");
} else {
strResult = name.getResource("/").toString().replace("file:", "")
.replace("%20", " ");
}
return strResult;
}
}
第二种 中文字符
package com.myFirstSpring.util;
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;
public class ValidateCodeUtils_zh extends HttpServlet {
private static final long serialVersionUID = 6699312412706395069L;
public static final int WIDTH = 120;
public static final int HEIGHT = 30;
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");
// 创建缓存
BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB);
// 获得画布
Graphics g = bi.getGraphics();
// 设置背影色
setBackGround(g);
// 设置边框
setBorder(g);
// 画干扰线
drawRandomLine(g);
// 写随机数
String random = drawRandomNum((Graphics2D) g);
// 将随机汉字存在session中
request.getSession().setAttribute("piccode", random);
// 将图形写给浏览器
response.setContentType("image/jpeg");
// 发头控制浏览器不要缓存
response.setDateHeader("expries", -1);
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
// 将图片写给浏览器
ImageIO.write(bi, "jpg", response.getOutputStream());
}
private void setBackGround(Graphics g) {
// 设置颜色
g.setColor(Color.WHITE);
// 填充区域
g.fillRect(0, 0, WIDTH, HEIGHT);
}
private void setBorder(Graphics g) {
// 设置边框颜色
g.setColor(Color.BLUE);
// 边框区域
g.drawRect(1, 1, WIDTH - 2, HEIGHT - 2);
}
private void drawRandomLine(Graphics g) {
// 设置颜色
g.setColor(Color.GREEN);
// 设置线条个数并画线
for (int i = 0; i < 5; 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 String drawRandomNum(Graphics2D g) {
StringBuffer sb = new StringBuffer();
// 设置颜色
g.setColor(Color.RED);
// 设置字体
g.setFont(new Font("宋体", Font.BOLD, 20));
// 准备常用汉字集
String base = "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";
int x = 5;
// 控制字数
for (int i = 0; i < 4; i++) {
// 设置字体旋转角度
int degree = new Random().nextInt() % 30;
// 截取汉字
String ch = base.charAt(new Random().nextInt(base.length())) + "";
sb.append(ch);
// 正向角度
g.rotate(degree * Math.PI / 180, x, 20);
g.drawString(ch, x, 20);
// 反向角度
g.rotate(-degree * Math.PI / 180, x, 20);
x += 30;
}
return sb.toString();
}
}
第三种 加减乘除方式
package com.myFirstSpring.util;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ValidateCodeUtils_algorithm extends HttpServlet {
private static final long serialVersionUID = -1409007752285164213L;
private static int width = 75;
private static int height = 35;
// private static char[] ch =
// "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789".toCharArray();
private static char[] ch = "0123456789".toCharArray();
private static char[] sf = "+-x".toCharArray();
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
// 生成数字和字母的验证码
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setContentType("image/jpeg");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
// 在内存中创建图象
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics g = image.getGraphics();
// 生成随机类
Random random = new Random();
// 设定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
// 设定字体
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
// 画边框
// g.setColor(new Color());
// g.drawRect(0,0,width-1,height-1);
// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}
// 取随机产生的认证码(4位数字)
StringBuffer sb = new StringBuffer();
int index, len = ch.length;
index = random.nextInt(len);
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 20));// 输出的字体和大小
g.drawString("" + ch[index], (0 * 15), 26);// 写什么数字，在图片的什么位置画
sb.append(ch[index]);
int index1, len1 = sf.length;
index1 = random.nextInt(len1);
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 20));// 输出的字体和大小
g.drawString("" + sf[index1], (1 * 15), 26);// 写什么数字，在图片的什么位置画
sb.append(sf[index1]);
int index2, len2 = ch.length;
index2 = random.nextInt(len2);
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 20));// 输出的字体和大小
if(String.valueOf(sf[index1]).equals("-")){
if(Integer.parseInt(String.valueOf(ch[index])) < Integer.parseInt(String.valueOf(ch[index2]))){
index2 = index;
}
}
g.drawString("" + ch[index2], (2 * 15) , 26);// 写什么数字，在图片的什么位置画
sb.append(ch[index2]);
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 20));// 输出的字体和大小
g.drawString("=", (3 * 15) , 26);// 写什么数字，在图片的什么位置画
sb.append("=");
g.setColor(new Color(random.nextInt(88), random.nextInt(188),
random.nextInt(255)));
g.setFont(new Font("Arial", Font.ITALIC, 20));// 输出的字体和大小
g.drawString("?", (4 * 15) , 26);// 写什么数字，在图片的什么位置画
sb.append("?");
g.drawLine(5, 3, 60, 35);
// 将认证码存入SESSION
int jg = 0;
if(String.valueOf(sf[index1]).equals("+")){
jg = Integer.parseInt(String.valueOf(ch[index])) + Integer.parseInt(String.valueOf(ch[index2]));
}
if(String.valueOf(sf[index1]).equals("-")){
jg = Integer.parseInt(String.valueOf(ch[index])) - Integer.parseInt(String.valueOf(ch[index2]));
}
if(String.valueOf(sf[index1]).equals("x")){
jg = Integer.parseInt(String.valueOf(ch[index])) * Integer.parseInt(String.valueOf(ch[index2]));
}
request.getSession().setAttribute("piccode", String.valueOf(jg));
request.getSession().setAttribute(request.getSession().getId(), sb.toString());
// 图象生效
g.dispose();
ServletOutputStream responseOutputStream = response.getOutputStream();
// 输出图象到页面
ImageIO.write(image, "JPEG", responseOutputStream);
// 以下关闭输入流！
responseOutputStream.flush();
responseOutputStream.close();
}
protected void ValidateCode(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// 在内存中创建图象
BufferedImage img = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 得到该图片的绘图对象
Graphics g = img.getGraphics();
Random r = new Random();
Color c = new Color(200, 150, 255);
g.setColor(c);
// 填充整个图片的颜色
g.fillRect(0, 0, width, height);
// 向图片中输出数字和字母
StringBuffer sb = new StringBuffer();
int index, len = ch.length;
for (int i = 0; i < 4; i++) {
index = r.nextInt(len);
g
.setColor(new Color(r.nextInt(88), r.nextInt(188), r
.nextInt(255)));
g.setFont(new Font("Arial", Font.BOLD | Font.ITALIC, 22));// 输出的字体和大小
g.drawString("" + ch[index], (i * 15) + 6, 18);// 写什么数字，在图片的什么位置画
sb.append(ch[index]);
}
request.getSession().setAttribute("piccode", sb.toString());
ServletOutputStream responseOutputStream = response.getOutputStream();
ImageIO.write(img, "JPG", responseOutputStream);
responseOutputStream.flush();
responseOutputStream.close();
}
Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
public static String getPath(Class name) {
String strResult = null;
if (System.getProperty("os.name").toLowerCase().indexOf("window") > -1) {
strResult = name.getResource("/").toString().replace("file:/", "")
.replace("%20", " ");
} else {
strResult = name.getResource("/").toString().replace("file:", "")
.replace("%20", " ");
}
return strResult;
}
}
直接复制代码可以测试生成的方法
前段调用方法如下所示
function flushVerifyImg() {
var timenow = new Date().getTime();
$("#VerifyImg").attr("src", '/servlet/Validate?d=' + timenow);
return false;
}
然后是配置文件 在web.xml配置如下
Validate com.myFirstSpring.util.ValidateCodeUtils Validate /servlet/Validate
其中重要的是一个你的文件路径需要配置正确 就是 com.myFirstSpring.util.ValidateCodeUtils
在放一下我的项目配置文件
CoBiker encodingFilter org.springframework.web.filter.CharacterEncodingFilter encoding UTF-8 forceEncoding true encodingFilter * org.springframework.web.context.ContextLoaderListener action org.springframework.web.servlet.DispatcherServlet 1 action / Validate com.myFirstSpring.util.ValidateCodeUtils Validate /servlet/Validate index.ftl 404 /WEB-INF/view/404.ftl 500 /index.ftl BASIC
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。
