java 3d验证码_Java实现验证码具体代码（图片、汉字）

本文为大家分享两个实例，相信大家一定会喜欢。

实例1：随机生成验证码图片并将之输出为一个png文件

效果图：

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.Random;

import javax.imageio.ImageIO;

public class Mytest10 {

public static Random random = new Random();

public static int r(int min,int max){

int num=0;

num=random.nextInt(max-min)+min;

return num;

}

public static void main(String[] args) throws IOException {

// TODO Auto-generated method stub

//在内存中创建一副图片

int w=120;

int h=50;

BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);

//在图片上画一个矩形当背景

Graphics g = img.getGraphics();

g.setColor(new Color(r(50,250),r(50,250),r(50,250)));

g.fillRect(0, 0, w, h);

String str = “aqzxswedcfrvgtbhyujklp”;

for(int i=0;i<4;i++){

g.setColor(new Color(r(50,180),r(50,180),r(50,180)));

g.setFont(new Font(“黑体”,Font.PLAIN,40));

char c = str.charAt(r(0,str.length()));

g.drawString(String.valueOf(c), 10+i*30, r(h-30,h));

}

//画随机线

for(int i=0;i<25;i++){

g.setColor(new Color(r(50,180),r(50,180),r(50,180)));

g.drawLine(r(0,w), r(0,h),r(0,w), r(0,h));

}<