生成验证码效果
validatecode.java 验证码生成类
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package cn.dsna.util.images;
import java.awt.color;
import java.awt.font;
import java.awt.graphics2d;
import java.awt.image.bufferedimage;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.io.outputstream;
import java.util.random;
import javax.imageio.imageio;
/**
* 验证码生成器
* @author dsna
*
*/
public class validatecode {
// 图片的宽度。
private int width = 160;
// 图片的高度。
private int height = 40;
// 验证码字符个数
private int codecount = 5;
// 验证码干扰线数
private int linecount = 150;
// 验证码
private string code = null;
// 验证码图片buffer
private bufferedimage buffimg=null;
private char[] codesequence = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j',
'k', 'l', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w',
'x', 'y', 'z', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
public validatecode() {
this.createcode();
}
/**
*
* @param width 图片宽
* @param height 图片高
*/
public validatecode(int width,int height) {
this.width=width;
this.height=height;
this.createcode();
}
/**
*
* @param width 图片宽
* @param height 图片高
* @param codecount 字符个数
* @param linecount 干扰线条数
*/
public validatecode(int width,int height,int codecount,int linecount) {
this.width=width;
this.height=height;
this.codecount=codecount;
this.linecount=linecount;
this.createcode();
}
public void createcode() {
int x = 0,fontheight=0,codey=0;
int red = 0, green = 0, blue = 0;
x = width / (codecount +2);//每个字符的宽度
fontheight = height - 2;//字体的高度
codey = height - 4;
// 图像buffer
buffimg = new bufferedimage(width, height,bufferedimage.type_int_rgb);
graphics2d g = buffimg.creategraphics();
// 生成随机数
random random = new random();
// 将图像填充为白色
g.setcolor(color.white);
g.fillrect(0, 0, width, height);
// 创建字体
imgfontbyte imgfont=new imgfontbyte();
font font =imgfont.getfont(fontheight);
g.setfont(font);
for (int i = 0; i < linecount; i++) {
int xs = random.nextint(width);
int ys = random.nextint(height);
int xe = xs+random.nextint(width/8);
int ye = ys+random.nextint(height/8);
red = random.nextint(255);
green = random.nextint(255);
blue = random.nextint(255);
g.setcolor(new color(red, green, blue));
g.drawline(xs, ys, xe, ye);
}
// randomcode记录随机产生的验证码
stringbuffer randomcode = new stringbuffer();
// 随机产生codecount个字符的验证码。
for (int i = 0; i < codecount; i++) {
string strrand = string.valueof(codesequence[random.nextint(codesequence.length)]);
// 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
red = random.nextint(255);
green = random.nextint(255);
blue = random.nextint(255);
g.setcolor(new color(red, green, blue));
g.drawstring(strrand, (i + 1) * x, codey);
// 将产生的四个随机数组合在一起。
randomcode.append(strrand);
}
// 将四位数字的验证码保存到session中。
code=randomcode.tostring();
}
public void write(string path) throws ioexception {
outputstream sos = new fileoutputstream(path);
this.write(sos);
}
public void write(outputstream sos) throws ioexception {
imageio.write(buffimg, "png", sos);
sos.close();
}
public bufferedimage getbuffimg() {
return buffimg;
}
public string getcode() {
return code;
}
}
imgfontbyte.java
package cn.dsna.util.images;
import java.io.bytearrayinputstream;
import java.awt.*;
/**
* ttf字体文件
* @author dsna
*
*/
public class imgfontbyte {
public font getfont(int fontheight){
try {
font basefont = font.createfont(font.truetype_font, new bytearrayinputstream(hex2byte(getfontbytestr())));
return basefont.derivefont(font.plain, fontheight);
} catch (exception e) {
return new font("arial",font.plain, fontheight);
}
}
private byte[] hex2byte(string str) {
if (str == null)
return null;
str = str.trim();
int len = str.length();
if (len == 0 || len % 2 == 1)
return null;
byte[] b = new byte[len / 2];
try {
for (int i = 0; i < str.length(); i += 2) {
b[i / 2] = (byte) integer
.decode("0x" + str.substring(i, i + 2)).intvalue();
}
return b;
} catch (exception e) {
return null;
}
} /**
* ttf字体文件的十六进制字符串
* @return
*/
private string getfontbytestr(){ return null;
return str;//字符串太长 在附件中找
}
}
validatecodeservlet.java servlet调用方法
package cn.dsna.util.images;
import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import javax.servlet.http.httpsession;
public class validatecodeservlet extends httpservlet {
private static final long serialversionuid = 1l;
@override
protected void doget(httpservletrequest reqeust,
httpservletresponse response) throws servletexception, ioexception {
// 设置响应的类型格式为图片格式
response.setcontenttype("image/jpeg");
//禁止图像缓存。
response.setheader("pragma", "no-cache");
response.setheader("cache-control", "no-cache");
response.setdateheader("expires", 0);
httpsession session = reqeust.getsession();
validatecode vcode = new validatecode(120,40,5,100);
session.setattribute("code", vcode.getcode());
vcode.write(response.getoutputstream());
}
/**
* web.xml 添加servlet
<servlet>
<servlet-name>validatecodeservlet</servlet-name>
<servlet-class>cn.dsna.util.images.validatecodeservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>validatecodeservlet</servlet-name>
<url-pattern>*.images</url-pattern>
</servlet-mapping>
在地址栏输入xxx/dsna.images 测试
*/
}
测试类
validatecodetest.java
package cn.dsna.util.images;
import java.io.ioexception;
import java.util.date;
public class validatecodetest {
/**
* @param args
*/
public static void main(string[] args) {
validatecode vcode = new validatecode(120,40,5,100);
try {
string path="d:/t/"+new date().gettime()+".png";
system.out.println(vcode.getcode()+" >"+path);
vcode.write(path);
} catch (ioexception e) {
e.printstacktrace();
}
}
}
web.xml 配置
<servlet> <servlet-name>validatecodeservlet</servlet-name> <servlet-class>cn.dsna.util.images.validatecodeservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>validatecodeservlet</servlet-name> <url-pattern>*.images</url-pattern> </servlet-mapping>
以上所述是小编给大家介绍的java生成图形验证码工具类，希望对大家有所帮助
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