JAVA生成图片验证码

原文地址：http://blog.csdn.net/ruixue0117/article/details/22829557 本屌稍作修改！再加一个基础功能的方法

一：基础功能方法

Img.java

import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.FileNotFoundException;import java.io.IOException;import java.io.OutputStream;import javax.imageio.ImageIO;public class Img {public static void outputCodeImg (int width,int height,String code,OutputStream os ) throws FileNotFoundException, IOException {BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR_PRE);//获取画笔Graphics gra = bi.getGraphics();//设置背景颜色gra.setColor(Color.BLACK);//填充背景颜色gra.fillRect(0, 0, width, height);//第二次 设置字体颜色gra.setColor(Color.red);//设置字体样式和大小gra.setFont(new Font(null, Font.HANGING_BASELINE,20));//描绘gra.drawString(code.toString(), 5, height-5);ImageIO.write(bi, "png", os);}}<strong></strong>

效果

二：升级版（转帖）

ImgCode.java

import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.RenderingHints;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Arrays;import java.util.Random;import javax.imageio.ImageIO;public class ImgCode {  /** * 生成验证码图片 * @param width * @param height * @param codeLength * @param os * @throws IOException */public static void outputCodeImg(int width,int height,String code,OutputStream os) throws IOException{BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  //获取画笔        Graphics2D g2 = image.createGraphics();          g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);          Color[] colors = new Color[5];          Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,                  Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,                  Color.PINK, Color.YELLOW };          float[] fractions = new float[colors.length];          Random rand = new Random();         for(int i = 0; i < colors.length; i++){              colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];              fractions[i] = rand.nextFloat();          }          Arrays.sort(fractions);                  g2.setColor(Color.GRAY);// 设置边框色          g2.fillRect(0, 0, width, height);                    Color c = getRandColor(200, 250);          g2.setColor(c);// 设置背景色          g2.fillRect(0, 2, width, height-4);                  //绘制干扰线          Random random = new Random();          g2.setColor(getRandColor(160, 200));// 设置线条的颜色          for (int i = 0; i < 20; i++) {              int x = random.nextInt(width - 1);              int y = random.nextInt(height - 1);              int xl = random.nextInt(6) + 1;              int yl = random.nextInt(12) + 1;              g2.drawLine(x, y, x + xl + 40, y + yl + 20);          }                    // 添加噪点          float yawpRate = 0.05f;// 噪声率          int area = (int) (yawpRate * width * height);          for (int i = 0; i < area; i++) {              int x = random.nextInt(width);              int y = random.nextInt(height);              int rgb = getRandomIntColor();              image.setRGB(x, y, rgb);          }                  shear(g2, width, height, c);// 使图片扭曲                  g2.setColor(getRandColor(100, 160));          int fontSize = height-4;          Font font = new Font("Algerian", Font.ITALIC, fontSize);          g2.setFont(font);                 char[] chars = code.toCharArray();          int verifySize = code.length();        for(int i = 0; i < verifySize; i++){              AffineTransform affine = new AffineTransform();              affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (width / verifySize) * i + fontSize/2, height/2);              g2.setTransform(affine);              //如果上下 左右两边的验证码出现的位置不对，条件4 ， 5参数            g2.drawChars(chars, i, 1, ((width-10) / verifySize) * i + 5, height/2 + fontSize/2 -2 );          }                    g2.dispose();  ImageIO.write(image, "jpg", os);  }/** * 返回验证码 * @return */public static String getCode(int length){Random random = new Random();StringBuffer code = new StringBuffer();for(int i = 0; i < length; i++){int num = random.nextInt(10); //数字char upperCase = (char) (random.nextInt(26)+65); //大写字母String[] s= new String[2];s[0] = num + "";s[1] = upperCase+ "";code.append(s[random.nextInt(2)]);}return code.toString();} private static Color getRandColor(int fc, int bc) {     Random random = new Random();         if (fc > 255)              fc = 255;          if (bc > 255)              bc = 255;          int r = fc + random.nextInt(bc - fc);          int g = fc + random.nextInt(bc - fc);          int b = fc + random.nextInt(bc - fc);          return new Color(r, g, b);      }     private static int getRandomIntColor() {     Random random = new Random();        int[] rgb =  new int[3];         for (int i = 0; i < 3; i++) {              rgb[i] = random.nextInt(255);          }          int color = 0;          for (int c : rgb) {              color = color << 8;              color = color | c;          }          return color;      }     private static void shear(Graphics g, int w1, int h1, Color color) {          shearX(g, w1, h1, color);          shearY(g, w1, h1, color);      }     private static void shearX(Graphics g, int w1, int h1, Color color) {     Random random = new Random();        int period = random.nextInt(2);            boolean borderGap = true;          int frames = 1;          int phase = random.nextInt(2);            for (int i = 0; i < h1; i++) {              double d = (double) (period >> 1)                      * Math.sin((double) i / (double) period                              + (6.2831853071795862D * (double) phase)                              / (double) frames);              g.copyArea(0, i, w1, 1, (int) d, 0);              if (borderGap) {                  g.setColor(color);                  g.drawLine((int) d, i, 0, i);                  g.drawLine((int) d + w1, i, w1, i);              }          }        }     private static void shearY(Graphics g, int w1, int h1, Color color) {     Random random = new Random();        int period = random.nextInt(40) + 10; // 50;            boolean borderGap = true;          int frames = 20;          int phase = 7;          for (int i = 0; i < w1; i++) {              double d = (double) (period >> 1)                      * Math.sin((double) i / (double) period                              + (6.2831853071795862D * (double) phase)                              / (double) frames);              g.copyArea(i, 0, 1, h1, 0, (int) d);              if (borderGap) {                  g.setColor(color);                  g.drawLine(i, (int) d, i, 0);                  g.drawLine(i, (int) d + h1, i, h1);              }            }        }  }<strong></strong>

效果

测试类Test.java

public class Test{  public static void main(String[] args) {try {String code = ImgCode.getCode(5);ImgCode.outputCodeImg(120, 30, code,  new FileOutputStream(new File("c:/"+code+".jpg")));Img.outputCodeImg(80, 25, code, new FileOutputStream(new File("c:/"+code+".png")));System.out.println(code);} catch (FileNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}    }