package com.fxr.生成随机图片;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 Main {    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) {        //在内存中创建一张图片        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 = "aqzxswedcfrvgtbhyujklp23456789";            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));            }            //把内存中创建的图像输出到文件中            File file =new File("e.png");            try {                ImageIO.write(img, "png", file);            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            System.out.println("图片输出完成");                         }                }