小编整理了一篇关于模仿腾讯随机验证图片的文章。下面直接上代码吧！一个java 类和一个jsp 页面。
java类代码：
以下是jsp模仿腾讯随机验证图片引用片段：
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package icewee.image;
import java.awt.basicstroke;
import java.awt.color;
import java.awt.font;
import java.awt.graphics2d;
import java.awt.renderinghints;
import java.awt.geom.line2d;
import java.awt.image.bufferedimage;
import java.util.random;
public class tokenutil {
private static final string base = "23456789abcdefghjklmnpqrstuvwxyzabcdefhijklmnpqrstuvwxyz";
private static final int length = base.length();
public static bufferedimage createtokenimage(int width, int height,
string randomcode) {
bufferedimage image = new bufferedimage(width, height,
bufferedimage.type_int_rgb);
graphics2d g = image.creategraphics();
random random = new random();
g.setcolor(new color(230, 230, 250)); // 设置背景色
g.fillrect(0, 0, width, height); // 填充背景
g.setcolor(color.black);
// 绘制边缘
g.drawrect(-1, -1, width + 1, height + 1);
g.setcolor(color.gray);
// 设置字体,随机选择字体,暂设置8种字体
font font = new font((new string[] { "arial", "arial black",
"arial italic", "courier new", "courier new bold italic",
"courier new italic", "franklin gothic medium",
"franklin gothic medium italic" })[random.nextint(8)],
font.plain, 30);
// g.setstroke(new basicstroke((float)(math.random()),
// basicstroke.cap_butt, basicstroke.join_bevel));
g.setfont(font);
// 定义字体颜色范围
int red = random.nextint(160), green = random.nextint(50), blue = random
.nextint(50);
// 定义一个无干扰线区间和一个起始位置
int nor = random.nextint(50), rsta = random.nextint(131);
// 绘制干扰正弦曲线 m:曲线平折度, d:y轴常量 v:x轴焦距
int m = random.nextint(15) + 5, d = random.nextint(23) + 15, v = random
.nextint(5) + 1;
double x = 0.0;
double y = m * math.sin(math.toradians(v * x)) + d;
double px, py;
for (int i = 0; i < 131; i++) {
px = x + 1;
py = m * math.sin(math.toradians(v * px)) + d;
if (rsta < i && i < (rsta + nor))
g.setcolor(new color(230, 230, 250));
else
g.setcolor(new color(red, green, blue));
// 随机设置像素点宽带(线宽)
g.setstroke(new basicstroke((float) (math.random() + 1.5f)));
g.draw(new line2d.double(x, y, px, py));
x = px;
y = py;
}
char[] codes = randomcode.tochararray();
for (int i = 0; i < codes.length; i++) {
// 旋转图形
int degree = (random.nextint(20) - 10) % 360;
double ang = degree * 0.0174532925; // 将角度转为弧度
g.rotate(ang, width / 2, height / 2);
g.setcolor(new color(red, green, blue));
g.setrenderinghint(renderinghints.key_antialiasing,
renderinghints.value_antialias_on);
int gr = random.nextint(8);
g.drawstring(string.valueof(codes[i]), 24 * i + 10 + gr, 38);
}
g.dispose();
return image;
}
public static string createrandomcode(int size, int width, int height) {
stringbuffer randomcode = new stringbuffer();
for (int i = 0; i < size; i++) {
random random = new random();
int start = random.nextint(length);
string strrand = base.substring(start, start + 1);
randomcode.append(strrand);
}
return randomcode.tostring();
}
}
jsp页面：
以下是jsp模仿腾讯随机验证图片代码引用片段：
<%@ page contenttype="image/jpeg" pageencoding="gbk"%>
<%@ page import="java.awt.image.bufferedimage" %>
<%@page import="javax.imageio.imageio" %>
<%@ page import="com.icesoft.image.tokenutil" %>
<%
//设置页面不缓存
response.setheader("pragma", "no-cache");
response.setheader("cache-control", "no-cache");
response.setdateheader("expires", 0);
int width = 120, height = 50;
string randomcode = tokenutil.createrandomcode(4, width, height);
system.out.println("生成的随机码：" + randomcode);
bufferedimage image = tokenutil.createtokenimage(width, height, randomcode);
imageio.write(image, "jpeg", response.getoutputstream());
response.flushbuffer();
out.clear();
out = pagecontext.pushbody();
%>
以上就是jsp 模仿腾讯随机验证图片全部代码，希望对大家的学习有所帮助。
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