Java 生成图片验证码3种方法(字母、加减乘除、中文)

2023-08-02 17:45:04 78

第一种方法全是字母和数字组成

packagecom.myFirstSpring.util;

importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.util.Random;

importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.ServletOutputStream;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

/**
*
*@Description生成验证码
*@authorwaa
*@versionV1.0,日期2011-7-4
*/
publicclassValidateCodeUtilsextendsHttpServlet{

privatestaticfinallongserialVersionUID=-1409007752285164213L;
privatestaticintwidth=75;
privatestaticintheight=35;
//privatestaticchar[]ch=
//"AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789".toCharArray();
privatestaticchar[]ch="abcdefghijklmnopqrstuvwxyz0123456789".toCharArray();

publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)

throwsServletException,IOException{

this.doPost(request,response);

}

//生成数字和字母的验证码
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}

protectedvoidprocessRequest(HttpServletRequestrequest,
HttpServletResponseresponse)throwsServletException,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
BufferedImageimage=newBufferedImage(width,height,
BufferedImage.TYPE_INT_RGB);

//获取图形上下文
Graphicsg=image.getGraphics();

//生成随机类
Randomrandom=newRandom();

//设定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0,0,width,height);

//设定字体
g.setFont(newFont("TimesNewRoman",Font.PLAIN,18));

//画边框
//g.setColor(newColor());
//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(inti=0;i<155;i++){
intx=random.nextInt(width);
inty=random.nextInt(height);
intxl=random.nextInt(12);
intyl=random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}

//取随机产生的认证码(4位数字)
StringBuffersb=newStringBuffer();
intindex,len=ch.length;
for(inti=0;i<4;i++){
index=random.nextInt(len);
g.setColor(newColor(random.nextInt(88),random.nextInt(188),
random.nextInt(255)));
g.setFont(newFont("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();
ServletOutputStreamresponseOutputStream=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();

}

protectedvoidValidateCode(HttpServletRequestrequest,
HttpServletResponseresponse)throwsServletException,IOException{
//在内存中创建图象
BufferedImageimg=newBufferedImage(width,height,
BufferedImage.TYPE_INT_RGB);
//得到该图片的绘图对象
Graphicsg=img.getGraphics();

Randomr=newRandom();
Colorc=newColor(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
StringBuffersb=newStringBuffer();
intindex,len=ch.length;
for(inti=0;i<4;i++){
index=r.nextInt(len);
g
.setColor(newColor(r.nextInt(88),r.nextInt(188),r
.nextInt(255)));
g.setFont(newFont("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());
ServletOutputStreamresponseOutputStream=response.getOutputStream();
ImageIO.write(img,"JPG",responseOutputStream);
responseOutputStream.flush();
responseOutputStream.close();
}

ColorgetRandColor(intfc,intbc){//给定范围获得随机颜色
Randomrandom=newRandom();
if(fc>255)
fc=255;
if(bc>255)
bc=255;
intr=fc+random.nextInt(bc-fc);
intg=fc+random.nextInt(bc-fc);
intb=fc+random.nextInt(bc-fc);
returnnewColor(r,g,b);
}

/**
*得到某一个类的路径
*
*@paramname
*@return
*/
publicstaticStringgetPath(Classname){
StringstrResult=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","");
}
returnstrResult;
}
}

第二种中文字符

packagecom.myFirstSpring.util;

importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.Graphics2D;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.util.Random;

importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

/**
*生成验证码(汉字)
*
*@author冰雨凌風
*
*/
publicclassValidateCodeUtils_zhextendsHttpServlet{
/**
*
*/
privatestaticfinallongserialVersionUID=6699312412706395069L;
publicstaticfinalintWIDTH=120;
publicstaticfinalintHEIGHT=30;

publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
this.doPost(request,response);
}

publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
//创建缓存
BufferedImagebi=newBufferedImage(WIDTH,HEIGHT,
BufferedImage.TYPE_INT_RGB);
//获得画布
Graphicsg=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
Stringrandom=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());
}

/**
*设置背景色
*
*@paramg
*/
privatevoidsetBackGround(Graphicsg){
//设置颜色
g.setColor(Color.WHITE);
//填充区域
g.fillRect(0,0,WIDTH,HEIGHT);

}

/**
*设置边框
*
*@paramg
*/
privatevoidsetBorder(Graphicsg){
//设置边框颜色
g.setColor(Color.BLUE);
//边框区域
g.drawRect(1,1,WIDTH-2,HEIGHT-2);
}

/**
*画随机线条
*
*@paramg
*/
privatevoiddrawRandomLine(Graphicsg){
//设置颜色
g.setColor(Color.GREEN);
//设置线条个数并画线
for(inti=0;i<5;i++){
intx1=newRandom().nextInt(WIDTH);
inty1=newRandom().nextInt(HEIGHT);
intx2=newRandom().nextInt(WIDTH);
inty2=newRandom().nextInt(HEIGHT);
g.drawLine(x1,y1,x2,y2);
}

}

/**
*画随机汉字
*
*@paramg
*@return
*/
privateStringdrawRandomNum(Graphics2Dg){
StringBuffersb=newStringBuffer();
//设置颜色
g.setColor(Color.RED);
//设置字体
g.setFont(newFont("宋体",Font.BOLD,20));
//准备常用汉字集
Stringbase="\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\u4e0b\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\u8001\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\u4e9b\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\u4f46\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\u98de\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\u62ff\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\u9898\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\u540d\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\u5f62\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\u653f\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\u5566\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\u7ec6";
intx=5;
//控制字数
for(inti=0;i<4;i++){
//设置字体旋转角度
intdegree=newRandom().nextInt()%30;
//截取汉字
Stringch=base.charAt(newRandom().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;
}
returnsb.toString();
}
}

第三种加减乘除方式

packagecom.myFirstSpring.util;

importjava.awt.Color;
importjava.awt.Font;
importjava.awt.Graphics;
importjava.awt.image.BufferedImage;
importjava.io.IOException;
importjava.util.Random;

importjavax.imageio.ImageIO;
importjavax.servlet.ServletException;
importjavax.servlet.ServletOutputStream;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

/**
*
*@Description生成验证码(加减乘)
*@authorwaa
*@versionV1.0,日期2011-7-4
*/
publicclassValidateCodeUtils_algorithmextendsHttpServlet{

privatestaticfinallongserialVersionUID=-1409007752285164213L;
privatestaticintwidth=75;
privatestaticintheight=35;
//privatestaticchar[]ch=
//"AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789".toCharArray();
privatestaticchar[]ch="0123456789".toCharArray();
privatestaticchar[]sf="+-x".toCharArray();

publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)

throwsServletException,IOException{

this.doPost(request,response);

}

//生成数字和字母的验证码
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
processRequest(request,response);
}

protectedvoidprocessRequest(HttpServletRequestrequest,
HttpServletResponseresponse)throwsServletException,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
BufferedImageimage=newBufferedImage(width,height,
BufferedImage.TYPE_INT_RGB);

//获取图形上下文
Graphicsg=image.getGraphics();

//生成随机类
Randomrandom=newRandom();

//设定背景色
g.setColor(getRandColor(200,250));
g.fillRect(0,0,width,height);

//设定字体
g.setFont(newFont("TimesNewRoman",Font.PLAIN,18));

//画边框
//g.setColor(newColor());
//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(inti=0;i<155;i++){
intx=random.nextInt(width);
inty=random.nextInt(height);
intxl=random.nextInt(12);
intyl=random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}

//取随机产生的认证码(4位数字)
StringBuffersb=newStringBuffer();
intindex,len=ch.length;
index=random.nextInt(len);
g.setColor(newColor(random.nextInt(88),random.nextInt(188),
random.nextInt(255)));
g.setFont(newFont("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]);

intindex1,len1=sf.length;
index1=random.nextInt(len1);
g.setColor(newColor(random.nextInt(88),random.nextInt(188),
random.nextInt(255)));
g.setFont(newFont("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]);


intindex2,len2=ch.length;
index2=random.nextInt(len2);
g.setColor(newColor(random.nextInt(88),random.nextInt(188),
random.nextInt(255)));
g.setFont(newFont("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]))255)
fc=255;
if(bc>255)
bc=255;
intr=fc+random.nextInt(bc-fc);
intg=fc+random.nextInt(bc-fc);
intb=fc+random.nextInt(bc-fc);
returnnewColor(r,g,b);
}

/**
*得到某一个类的路径
*
*@paramname
*@return
*/
publicstaticStringgetPath(Classname){
StringstrResult=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","");
}
returnstrResult;
}
}

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

functionflushVerifyImg(){
vartimenow=newDate().getTime();
$("#VerifyImg").attr("src",'/servlet/Validate?d='+timenow);
returnfalse;
}

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毛票票。

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Java 生成图片验证码3种方法(字母、加减乘除、中文)

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